diff options
author | peter <peter@FreeBSD.org> | 2013-08-11 20:03:12 +0000 |
---|---|---|
committer | peter <peter@FreeBSD.org> | 2013-08-11 20:03:12 +0000 |
commit | 5f2a1d653696ec5457bfd044f0ebcd873bfc3c80 (patch) | |
tree | 7c1ae67d07b93aea05bfea51c590c1112b65042b /contrib/nvi/regex | |
parent | 324febaf01918418f99998aa5537126ac98c9df0 (diff) | |
download | FreeBSD-src-5f2a1d653696ec5457bfd044f0ebcd873bfc3c80.zip FreeBSD-src-5f2a1d653696ec5457bfd044f0ebcd873bfc3c80.tar.gz |
Update nvi-1.79 to 2.1.1-4334a8297f
This is the gsoc-2011 project to clean up and backport multibyte support
from other nvi forks in a form we can use.
USE_WIDECHAR is on unless building for the rescue crunchgen. This should
allow editing in the native locale encoding.
USE_ICONV depends on make.conf having 'WITH_ICONV=YES' for now. This
adds the ability to do things like edit a KOI8-R file while having $LANG
set to (say) en_US.UTF-8. iconv is used to transcode the characters for
display.
Other points:
* It uses gencat and catopen/etc instead of homegrown msg catalog stuff.
* A lot of stuff has been trimmed out, eg: the perl and tcl bindings which
we could never use in base anyway.
* It uses ncursesw when in widechar mode. This could be interesting.
GSoC info: http://www.google-melange.com/gsoc/proposal/review/google/gsoc2011/zy/1
Repo at: https://github.com/lichray/nvi2
Obtained from: Zhihao Yuan <lichray@gmail.com>
Diffstat (limited to 'contrib/nvi/regex')
-rw-r--r-- | contrib/nvi/regex/COPYRIGHT | 56 | ||||
-rw-r--r-- | contrib/nvi/regex/WHATSNEW | 94 | ||||
-rw-r--r-- | contrib/nvi/regex/cclass.h | 85 | ||||
-rw-r--r-- | contrib/nvi/regex/cname.h | 143 | ||||
-rw-r--r-- | contrib/nvi/regex/engine.c | 1102 | ||||
-rw-r--r-- | contrib/nvi/regex/re_format.7 | 271 | ||||
-rw-r--r-- | contrib/nvi/regex/regcomp.c | 1737 | ||||
-rw-r--r-- | contrib/nvi/regex/regerror.c | 176 | ||||
-rw-r--r-- | contrib/nvi/regex/regex.3 | 540 | ||||
-rw-r--r-- | contrib/nvi/regex/regex.h | 109 | ||||
-rw-r--r-- | contrib/nvi/regex/regex2.h | 174 | ||||
-rw-r--r-- | contrib/nvi/regex/regexec.c | 180 | ||||
-rw-r--r-- | contrib/nvi/regex/regfree.c | 83 | ||||
-rw-r--r-- | contrib/nvi/regex/utils.h | 59 |
14 files changed, 4809 insertions, 0 deletions
diff --git a/contrib/nvi/regex/COPYRIGHT b/contrib/nvi/regex/COPYRIGHT new file mode 100644 index 0000000..574f6bc --- /dev/null +++ b/contrib/nvi/regex/COPYRIGHT @@ -0,0 +1,56 @@ +Copyright 1992, 1993, 1994 Henry Spencer. All rights reserved. +This software is not subject to any license of the American Telephone +and Telegraph Company or of the Regents of the University of California. + +Permission is granted to anyone to use this software for any purpose on +any computer system, and to alter it and redistribute it, subject +to the following restrictions: + +1. The author is not responsible for the consequences of use of this + software, no matter how awful, even if they arise from flaws in it. + +2. The origin of this software must not be misrepresented, either by + explicit claim or by omission. Since few users ever read sources, + credits must appear in the documentation. + +3. Altered versions must be plainly marked as such, and must not be + misrepresented as being the original software. Since few users + ever read sources, credits must appear in the documentation. + +4. This notice may not be removed or altered. + +=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= +/*- + * Copyright (c) 1994 + * The Regents of the University of California. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * @(#)COPYRIGHT 8.1 (Berkeley) 3/16/94 + */ diff --git a/contrib/nvi/regex/WHATSNEW b/contrib/nvi/regex/WHATSNEW new file mode 100644 index 0000000..f4301d3 --- /dev/null +++ b/contrib/nvi/regex/WHATSNEW @@ -0,0 +1,94 @@ +# @(#)WHATSNEW 8.3 (Berkeley) 3/18/94 + +New in alpha3.4: The complex bug alluded to below has been fixed (in a +slightly kludgey temporary way that may hurt efficiency a bit; this is +another "get it out the door for 4.4" release). The tests at the end of +the tests file have accordingly been uncommented. The primary sign of +the bug was that something like a?b matching ab matched b rather than ab. +(The bug was essentially specific to this exact situation, else it would +have shown up earlier.) + +New in alpha3.3: The definition of word boundaries has been altered +slightly, to more closely match the usual programming notion that "_" +is an alphabetic. Stuff used for pre-ANSI systems is now in a subdir, +and the makefile no longer alludes to it in mysterious ways. The +makefile has generally been cleaned up some. Fixes have been made +(again!) so that the regression test will run without -DREDEBUG, at +the cost of weaker checking. A workaround for a bug in some folks' +<assert.h> has been added. And some more things have been added to +tests, including a couple right at the end which are commented out +because the code currently flunks them (complex bug; fix coming). +Plus the usual minor cleanup. + +New in alpha3.2: Assorted bits of cleanup and portability improvement +(the development base is now a BSDI system using GCC instead of an ancient +Sun system, and the newer compiler exposed some glitches). Fix for a +serious bug that affected REs using many [] (including REG_ICASE REs +because of the way they are implemented), *sometimes*, depending on +memory-allocation patterns. The header-file prototypes no longer name +the parameters, avoiding possible name conflicts. The possibility that +some clot has defined CHAR_MIN as (say) `-128' instead of `(-128)' is +now handled gracefully. "uchar" is no longer used as an internal type +name (too many people have the same idea). Still the same old lousy +performance, alas. + +New in alpha3.1: Basically nothing, this release is just a bookkeeping +convenience. Stay tuned. + +New in alpha3.0: Performance is no better, alas, but some fixes have been +made and some functionality has been added. (This is basically the "get +it out the door in time for 4.4" release.) One bug fix: regfree() didn't +free the main internal structure (how embarrassing). It is now possible +to put NULs in either the RE or the target string, using (resp.) a new +REG_PEND flag and the old REG_STARTEND flag. The REG_NOSPEC flag to +regcomp() makes all characters ordinary, so you can match a literal +string easily (this will become more useful when performance improves!). +There are now primitives to match beginnings and ends of words, although +the syntax is disgusting and so is the implementation. The REG_ATOI +debugging interface has changed a bit. And there has been considerable +internal cleanup of various kinds. + +New in alpha2.3: Split change list out of README, and moved flags notes +into Makefile. Macro-ized the name of regex(7) in regex(3), since it has +to change for 4.4BSD. Cleanup work in engine.c, and some new regression +tests to catch tricky cases thereof. + +New in alpha2.2: Out-of-date manpages updated. Regerror() acquires two +small extensions -- REG_ITOA and REG_ATOI -- which avoid debugging kludges +in my own test program and might be useful to others for similar purposes. +The regression test will now compile (and run) without REDEBUG. The +BRE \$ bug is fixed. Most uses of "uchar" are gone; it's all chars now. +Char/uchar parameters are now written int/unsigned, to avoid possible +portability problems with unpromoted parameters. Some unsigned casts have +been introduced to minimize portability problems with shifting into sign +bits. + +New in alpha2.1: Lots of little stuff, cleanup and fixes. The one big +thing is that regex.h is now generated, using mkh, rather than being +supplied in the distribution; due to circularities in dependencies, +you have to build regex.h explicitly by "make h". The two known bugs +have been fixed (and the regression test now checks for them), as has a +problem with assertions not being suppressed in the absence of REDEBUG. +No performance work yet. + +New in alpha2: Backslash-anything is an ordinary character, not an +error (except, of course, for the handful of backslashed metacharacters +in BREs), which should reduce script breakage. The regression test +checks *where* null strings are supposed to match, and has generally +been tightened up somewhat. Small bug fixes in parameter passing (not +harmful, but technically errors) and some other areas. Debugging +invoked by defining REDEBUG rather than not defining NDEBUG. + +New in alpha+3: full prototyping for internal routines, using a little +helper program, mkh, which extracts prototypes given in stylized comments. +More minor cleanup. Buglet fix: it's CHAR_BIT, not CHAR_BITS. Simple +pre-screening of input when a literal string is known to be part of the +RE; this does wonders for performance. + +New in alpha+2: minor bits of cleanup. Notably, the number "32" for the +word width isn't hardwired into regexec.c any more, the public header +file prototypes the functions if __STDC__ is defined, and some small typos +in the manpages have been fixed. + +New in alpha+1: improvements to the manual pages, and an important +extension, the REG_STARTEND option to regexec(). diff --git a/contrib/nvi/regex/cclass.h b/contrib/nvi/regex/cclass.h new file mode 100644 index 0000000..f28bccd --- /dev/null +++ b/contrib/nvi/regex/cclass.h @@ -0,0 +1,85 @@ +/* $NetBSD: cclass.h,v 1.2 2008/12/05 22:51:42 christos Exp $ */ + +/*- + * Copyright (c) 1992, 1993, 1994 Henry Spencer. + * Copyright (c) 1992, 1993, 1994 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Henry Spencer of the University of Toronto. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * @(#)cclass.h 8.2 (Berkeley) 3/16/94 + */ + +RCHAR_T ALNUM[] = {'a','l','n','u','m',0}; +RCHAR_T ALPHA[] = {'a','l','p','h','a',0}; +RCHAR_T BLANK[] = {'b','l','a','n','k',0}; +RCHAR_T CNTRL[] = {'c','n','t','r','l',0}; +RCHAR_T DIGIT[] = {'d','i','g','i','t',0}; +RCHAR_T GRAPH[] = {'g','r','a','p','h',0}; +RCHAR_T LOWER[] = {'l','o','w','e','r',0}; +RCHAR_T PRINT[] = {'p','r','i','n','t',0}; +RCHAR_T PUNCT[] = {'p','u','n','c','t',0}; +RCHAR_T SPACE[] = {'s','p','a','c','e',0}; +RCHAR_T UPPER[] = {'u','p','p','e','r',0}; +RCHAR_T XDIGIT[] = {'x','d','i','g','i','t',0}; + +/* character-class table */ +static struct cclass { + RCHAR_T *name; + const char *chars; + const char *multis; +} cclasses[] = { + { ALNUM, "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz\ +0123456789", "" }, + { ALPHA, "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz", + "" }, + { BLANK, " \t", "" }, + { CNTRL, "\007\b\t\n\v\f\r\1\2\3\4\5\6\16\17\20\21\22\23\24\ +\25\26\27\30\31\32\33\34\35\36\37\177", "" }, + { DIGIT, "0123456789", "" }, + { GRAPH, "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz\ +0123456789!\"#$%&'()*+,-./:;<=>?@[\\]^_`{|}~", + "" }, + { LOWER, "abcdefghijklmnopqrstuvwxyz", + "" }, + { PRINT, "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz\ +0123456789!\"#$%&'()*+,-./:;<=>?@[\\]^_`{|}~ ", + "" }, + { PUNCT, "!\"#$%&'()*+,-./:;<=>?@[\\]^_`{|}~", + "" }, + { SPACE, "\t\n\v\f\r ", "" }, + { UPPER, "ABCDEFGHIJKLMNOPQRSTUVWXYZ", + "" }, + { XDIGIT, "0123456789ABCDEFabcdef", + "" }, + { NULL, 0, "" }, +}; diff --git a/contrib/nvi/regex/cname.h b/contrib/nvi/regex/cname.h new file mode 100644 index 0000000..da69843 --- /dev/null +++ b/contrib/nvi/regex/cname.h @@ -0,0 +1,143 @@ +/* $NetBSD: cname.h,v 1.2 2008/12/05 22:51:42 christos Exp $ */ + +/*- + * Copyright (c) 1992, 1993, 1994 Henry Spencer. + * Copyright (c) 1992, 1993, 1994 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Henry Spencer of the University of Toronto. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * @(#)cname.h 8.2 (Berkeley) 3/16/94 + */ + +/* character-name table */ +static struct cname { + const RCHAR_T *name; + char code; +} cnames[] = { + { L("NUL"), '\0' }, + { L("SOH"), '\001' }, + { L("STX"), '\002' }, + { L("ETX"), '\003' }, + { L("EOT"), '\004' }, + { L("ENQ"), '\005' }, + { L("ACK"), '\006' }, + { L("BEL"), '\007' }, + { L("alert"), '\007' }, + { L("BS"), '\010' }, + { L("backspace"), '\b' }, + { L("HT"), '\011' }, + { L("tab"), '\t' }, + { L("LF"), '\012' }, + { L("newline"), '\n' }, + { L("VT"), '\013' }, + { L("vertical-tab"), '\v' }, + { L("FF"), '\014' }, + { L("form-feed"), '\f' }, + { L("CR"), '\015' }, + { L("carriage-return"), '\r' }, + { L("SO"), '\016' }, + { L("SI"), '\017' }, + { L("DLE"), '\020' }, + { L("DC1"), '\021' }, + { L("DC2"), '\022' }, + { L("DC3"), '\023' }, + { L("DC4"), '\024' }, + { L("NAK"), '\025' }, + { L("SYN"), '\026' }, + { L("ETB"), '\027' }, + { L("CAN"), '\030' }, + { L("EM"), '\031' }, + { L("SUB"), '\032' }, + { L("ESC"), '\033' }, + { L("IS4"), '\034' }, + { L("FS"), '\034' }, + { L("IS3"), '\035' }, + { L("GS"), '\035' }, + { L("IS2"), '\036' }, + { L("RS"), '\036' }, + { L("IS1"), '\037' }, + { L("US"), '\037' }, + { L("space"), ' ' }, + { L("exclamation-mark"),'!' }, + { L("quotation-mark"), '"' }, + { L("number-sign"), '#' }, + { L("dollar-sign"), '$' }, + { L("percent-sign"), '%' }, + { L("ampersand"), '&' }, + { L("apostrophe"), '\'' }, + { L("left-parenthesis"),'(' }, + { L("right-parenthesis"),')' }, + { L("asterisk"), '*' }, + { L("plus-sign"), '+' }, + { L("comma"), ',' }, + { L("hyphen"), '-' }, + { L("hyphen-minus"), '-' }, + { L("period"), '.' }, + { L("full-stop"), '.' }, + { L("slash"), '/' }, + { L("solidus"), '/' }, + { L("zero"), '0' }, + { L("one"), '1' }, + { L("two"), '2' }, + { L("three"), '3' }, + { L("four"), '4' }, + { L("five"), '5' }, + { L("six"), '6' }, + { L("seven"), '7' }, + { L("eight"), '8' }, + { L("nine"), '9' }, + { L("colon"), ':' }, + { L("semicolon"), ';' }, + { L("less-than-sign"), '<' }, + { L("equals-sign"), '=' }, + { L("greater-than-sign"),'>' }, + { L("question-mark"), '?' }, + { L("commercial-at"), '@' }, + { L("left-square-bracket"),'[' }, + { L("backslash"), '\\' }, + { L("reverse-solidus"), '\\' }, + { L("right-square-bracket"),']' }, + { L("circumflex"), '^' }, + { L("circumflex-accent"),'^' }, + { L("underscore"), '_' }, + { L("low-line"), '_' }, + { L("grave-accent"), '`' }, + { L("left-brace"), '{' }, + { L("left-curly-bracket"),'{' }, + { L("vertical-line"), '|' }, + { L("right-brace"), '}' }, + { L("right-curly-bracket"),'}' }, + { L("tilde"), '~' }, + { L("DEL"), '\177' }, + { NULL, 0 }, +}; diff --git a/contrib/nvi/regex/engine.c b/contrib/nvi/regex/engine.c new file mode 100644 index 0000000..ad1c501 --- /dev/null +++ b/contrib/nvi/regex/engine.c @@ -0,0 +1,1102 @@ +/* $NetBSD: engine.c,v 1.7 2011/11/19 17:45:11 tnozaki Exp $ */ + +/*- + * Copyright (c) 1992, 1993, 1994 Henry Spencer. + * Copyright (c) 1992, 1993, 1994 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Henry Spencer of the University of Toronto. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * @(#)engine.c 8.4 (Berkeley) 3/19/94 + */ + +/* + * The matching engine and friends. This file is #included by regexec.c + * after suitable #defines of a variety of macros used herein, so that + * different state representations can be used without duplicating masses + * of code. + */ + +#ifdef SNAMES +#define matcher smatcher +#define fast sfast +#define slow sslow +#define dissect sdissect +#define backref sbackref +#define step sstep +#define print sprint +#define at sat +#define match smat +#endif +#ifdef LNAMES +#define matcher lmatcher +#define fast lfast +#define slow lslow +#define dissect ldissect +#define backref lbackref +#define step lstep +#define print lprint +#define at lat +#define match lmat +#endif + +/* another structure passed up and down to avoid zillions of parameters */ +struct match { + struct re_guts *g; + int eflags; + regmatch_t *pmatch; /* [nsub+1] (0 element unused) */ + const RCHAR_T *offp; /* offsets work from here */ + const RCHAR_T *beginp; /* start of string -- virtual NUL precedes */ + const RCHAR_T *endp; /* end of string -- virtual NUL here */ + const RCHAR_T *coldp; /* can be no match starting before here */ + const RCHAR_T **lastpos; /* [nplus+1] */ + STATEVARS; + states st; /* current states */ + states fresh; /* states for a fresh start */ + states tmp; /* temporary */ + states empty; /* empty set of states */ +}; + +/* ========= begin header generated by ./mkh ========= */ +#ifdef __cplusplus +extern "C" { +#endif + +/* === engine.c === */ +static int matcher __P((struct re_guts *g, const RCHAR_T *string, size_t nmatch, regmatch_t pmatch[], int eflags)); +static const RCHAR_T *dissect __P((struct match *m, const RCHAR_T *start, const RCHAR_T *stop, sopno startst, sopno stopst)); +static const RCHAR_T *backref __P((struct match *m, const RCHAR_T *start, const RCHAR_T *stop, sopno startst, sopno stopst, sopno lev)); +static const RCHAR_T *fast __P((struct match *m, const RCHAR_T *start, const RCHAR_T *stop, sopno startst, sopno stopst)); +static const RCHAR_T *slow __P((struct match *m, const RCHAR_T *start, const RCHAR_T *stop, sopno startst, sopno stopst)); +static states step __P((struct re_guts *g, sopno start, sopno stop, states bef, int flag, RCHAR_T ch, states aft)); +#define BOL (1) +#define EOL (BOL+1) +#define BOLEOL (BOL+2) +#define NOTHING (BOL+3) +#define BOW (BOL+4) +#define EOW (BOL+5) +#ifdef REDEBUG +static void print __P((struct match *m, char *caption, states st, int ch, FILE *d)); +#endif +#ifdef REDEBUG +static void at __P((struct match *m, char *title, char *start, char *stop, sopno startst, sopno stopst)); +#endif +#ifdef REDEBUG +static char *pchar __P((int ch)); +#endif + +#ifdef __cplusplus +} +#endif +/* ========= end header generated by ./mkh ========= */ + +#ifdef REDEBUG +#define SP(t, s, c) print(m, t, s, c, stdout) +#define AT(t, p1, p2, s1, s2) at(m, t, p1, p2, s1, s2) +#define NOTE(str) { if (m->eflags®_TRACE) printf("=%s\n", (str)); } +#else +#define SP(t, s, c) /* nothing */ +#define AT(t, p1, p2, s1, s2) /* nothing */ +#define NOTE(s) /* nothing */ +#endif + +/* + - matcher - the actual matching engine + == static int matcher(register struct re_guts *g, const RCHAR_T *string, \ + == size_t nmatch, regmatch_t pmatch[], int eflags); + */ +static int /* 0 success, REG_NOMATCH failure */ +matcher(g, string, nmatch, pmatch, eflags) +register struct re_guts *g; +const RCHAR_T *string; +size_t nmatch; +regmatch_t pmatch[]; +int eflags; +{ + register const RCHAR_T *endp; + register size_t i; + struct match mv; + register struct match *m = &mv; + register const RCHAR_T *dp; + register const sopno gf = g->firststate+1; /* +1 for OEND */ + register const sopno gl = g->laststate; + const RCHAR_T *start; + const RCHAR_T *stop; + + /* simplify the situation where possible */ + if (g->cflags®_NOSUB) + nmatch = 0; + if (eflags®_STARTEND) { + start = string + pmatch[0].rm_so; + stop = string + pmatch[0].rm_eo; + } else { + start = string; + stop = start + STRLEN(start); + } + if (stop < start) + return(REG_INVARG); + + /* prescreening; this does wonders for this rather slow code */ + if (g->must != NULL) { + for (dp = start; dp < stop; dp++) + if (*dp == g->must[0] && (size_t)(stop - dp) >= g->mlen && + MEMCMP(dp, g->must, g->mlen) == 0) + break; + if (dp == stop) /* we didn't find g->must */ + return(REG_NOMATCH); + } + + /* match struct setup */ + m->g = g; + m->eflags = eflags; + m->pmatch = NULL; + m->lastpos = NULL; + m->offp = string; + m->beginp = start; + m->endp = stop; + STATESETUP(m, 4); + SETUP(m->st); + SETUP(m->fresh); + SETUP(m->tmp); + SETUP(m->empty); + CLEAR(m->empty); + + /* this loop does only one repetition except for backrefs */ + for (;;) { + endp = fast(m, start, stop, gf, gl); + if (endp == NULL) { /* a miss */ + STATETEARDOWN(m); + return(REG_NOMATCH); + } + if (nmatch == 0 && !g->backrefs) + break; /* no further info needed */ + + /* where? */ + assert(m->coldp != NULL); + for (;;) { + NOTE("finding start"); + endp = slow(m, m->coldp, stop, gf, gl); + if (endp != NULL) + break; + assert(m->coldp < m->endp); + m->coldp++; + } + if (nmatch == 1 && !g->backrefs) + break; /* no further info needed */ + + /* oh my, he wants the subexpressions... */ + if (m->pmatch == NULL) + m->pmatch = (regmatch_t *)malloc((m->g->nsub + 1) * + sizeof(regmatch_t)); + if (m->pmatch == NULL) { + STATETEARDOWN(m); + return(REG_ESPACE); + } + for (i = 1; i <= m->g->nsub; i++) + m->pmatch[i].rm_so = m->pmatch[i].rm_eo = -1; + if (!g->backrefs && !(m->eflags®_BACKR)) { + NOTE("dissecting"); + dp = dissect(m, m->coldp, endp, gf, gl); + } else { + if (g->nplus > 0 && m->lastpos == NULL) + m->lastpos = (const RCHAR_T **)malloc((g->nplus+1) * + sizeof(const RCHAR_T *)); + if (g->nplus > 0 && m->lastpos == NULL) { + free(m->pmatch); + STATETEARDOWN(m); + return(REG_ESPACE); + } + NOTE("backref dissect"); + dp = backref(m, m->coldp, endp, gf, gl, (sopno)0); + } + if (dp != NULL) + break; + + /* uh-oh... we couldn't find a subexpression-level match */ + assert(g->backrefs); /* must be back references doing it */ + assert(g->nplus == 0 || m->lastpos != NULL); + for (;;) { + if (dp != NULL || endp <= m->coldp) + break; /* defeat */ + NOTE("backoff"); + endp = slow(m, m->coldp, endp-1, gf, gl); + if (endp == NULL) + break; /* defeat */ + /* try it on a shorter possibility */ +#ifndef NDEBUG + for (i = 1; i <= m->g->nsub; i++) { + assert(m->pmatch[i].rm_so == -1); + assert(m->pmatch[i].rm_eo == -1); + } +#endif + NOTE("backoff dissect"); + dp = backref(m, m->coldp, endp, gf, gl, (sopno)0); + } + assert(dp == NULL || dp == endp); + if (dp != NULL) /* found a shorter one */ + break; + + /* despite initial appearances, there is no match here */ + NOTE("false alarm"); + start = m->coldp + 1; /* recycle starting later */ + assert(start <= stop); + } + + /* fill in the details if requested */ + if (nmatch > 0) { + pmatch[0].rm_so = m->coldp - m->offp; + pmatch[0].rm_eo = endp - m->offp; + } + if (nmatch > 1) { + assert(m->pmatch != NULL); + for (i = 1; i < nmatch; i++) + if (i <= m->g->nsub) + pmatch[i] = m->pmatch[i]; + else { + pmatch[i].rm_so = -1; + pmatch[i].rm_eo = -1; + } + } + + if (m->pmatch != NULL) + free((char *)m->pmatch); + if (m->lastpos != NULL) + free((char *)m->lastpos); + STATETEARDOWN(m); + return(0); +} + +/* + - dissect - figure out what matched what, no back references + == static const RCHAR_T *dissect(register struct match *m, const RCHAR_T *start, \ + == const RCHAR_T *stop, sopno startst, sopno stopst); + */ +static const RCHAR_T * /* == stop (success) always */ +dissect(m, start, stop, startst, stopst) +register struct match *m; +const RCHAR_T *start; +const RCHAR_T *stop; +sopno startst; +sopno stopst; +{ + register int i; + register sopno ss; /* start sop of current subRE */ + register sopno es; /* end sop of current subRE */ + register const RCHAR_T *sp; /* start of string matched by it */ + register const RCHAR_T *stp; /* string matched by it cannot pass here */ + register const RCHAR_T *rest; /* start of rest of string */ + register const RCHAR_T *tail; /* string unmatched by rest of RE */ + register sopno ssub; /* start sop of subsubRE */ + register sopno esub; /* end sop of subsubRE */ + register const RCHAR_T *ssp; /* start of string matched by subsubRE */ + register const RCHAR_T *sep; /* end of string matched by subsubRE */ + register const RCHAR_T *oldssp; /* previous ssp */ + register const RCHAR_T *dp; + + AT("diss", start, stop, startst, stopst); + sp = start; + for (ss = startst; ss < stopst; ss = es) { + /* identify end of subRE */ + es = ss; + switch (m->g->strip[es]) { + case OPLUS_: + case OQUEST_: + es += m->g->stripdata[es]; + break; + case OCH_: + while (m->g->strip[es] != O_CH) + es += m->g->stripdata[es]; + break; + } + es++; + + /* figure out what it matched */ + switch (m->g->strip[ss]) { + case OEND: + assert(nope); + break; + case OCHAR: + sp++; + break; + case OBOL: + case OEOL: + case OBOW: + case OEOW: + break; + case OANY: + case OANYOF: + sp++; + break; + case OBACK_: + case O_BACK: + assert(nope); + break; + /* cases where length of match is hard to find */ + case OQUEST_: + stp = stop; + for (;;) { + /* how long could this one be? */ + rest = slow(m, sp, stp, ss, es); + assert(rest != NULL); /* it did match */ + /* could the rest match the rest? */ + tail = slow(m, rest, stop, es, stopst); + if (tail == stop) + break; /* yes! */ + /* no -- try a shorter match for this one */ + stp = rest - 1; + assert(stp >= sp); /* it did work */ + } + ssub = ss + 1; + esub = es - 1; + /* did innards match? */ + if (slow(m, sp, rest, ssub, esub) != NULL) { + dp = dissect(m, sp, rest, ssub, esub); + assert(dp == rest); + } else /* no */ + assert(sp == rest); + sp = rest; + break; + case OPLUS_: + stp = stop; + for (;;) { + /* how long could this one be? */ + rest = slow(m, sp, stp, ss, es); + assert(rest != NULL); /* it did match */ + /* could the rest match the rest? */ + tail = slow(m, rest, stop, es, stopst); + if (tail == stop) + break; /* yes! */ + /* no -- try a shorter match for this one */ + stp = rest - 1; + assert(stp >= sp); /* it did work */ + } + ssub = ss + 1; + esub = es - 1; + ssp = sp; + oldssp = ssp; + for (;;) { /* find last match of innards */ + sep = slow(m, ssp, rest, ssub, esub); + if (sep == NULL || sep == ssp) + break; /* failed or matched null */ + oldssp = ssp; /* on to next try */ + ssp = sep; + } + if (sep == NULL) { + /* last successful match */ + sep = ssp; + ssp = oldssp; + } + assert(sep == rest); /* must exhaust substring */ + assert(slow(m, ssp, sep, ssub, esub) == rest); + dp = dissect(m, ssp, sep, ssub, esub); + assert(dp == sep); + sp = rest; + break; + case OCH_: + stp = stop; + for (;;) { + /* how long could this one be? */ + rest = slow(m, sp, stp, ss, es); + assert(rest != NULL); /* it did match */ + /* could the rest match the rest? */ + tail = slow(m, rest, stop, es, stopst); + if (tail == stop) + break; /* yes! */ + /* no -- try a shorter match for this one */ + stp = rest - 1; + assert(stp >= sp); /* it did work */ + } + ssub = ss + 1; + esub = ss + m->g->stripdata[ss] - 1; + assert(m->g->strip[esub] == OOR1); + for (;;) { /* find first matching branch */ + if (slow(m, sp, rest, ssub, esub) == rest) + break; /* it matched all of it */ + /* that one missed, try next one */ + assert(m->g->strip[esub] == OOR1); + esub++; + assert(m->g->strip[esub] == OOR2); + ssub = esub + 1; + esub += m->g->stripdata[esub]; + if (m->g->strip[esub] == OOR2) + esub--; + else + assert(m->g->strip[esub] == O_CH); + } + dp = dissect(m, sp, rest, ssub, esub); + assert(dp == rest); + sp = rest; + break; + case O_PLUS: + case O_QUEST: + case OOR1: + case OOR2: + case O_CH: + assert(nope); + break; + case OLPAREN: + i = m->g->stripdata[ss]; + assert(0 < i && i <= m->g->nsub); + m->pmatch[i].rm_so = sp - m->offp; + break; + case ORPAREN: + i = m->g->stripdata[ss]; + assert(0 < i && i <= m->g->nsub); + m->pmatch[i].rm_eo = sp - m->offp; + break; + default: /* uh oh */ + assert(nope); + break; + } + } + + assert(sp == stop); + return(sp); +} + +/* + - backref - figure out what matched what, figuring in back references + == static const RCHAR_T *backref(register struct match *m, const RCHAR_T *start, \ + == const RCHAR_T *stop, sopno startst, sopno stopst, sopno lev); + */ +static const RCHAR_T * /* == stop (success) or NULL (failure) */ +backref(m, start, stop, startst, stopst, lev) +register struct match *m; +const RCHAR_T *start; +const RCHAR_T *stop; +sopno startst; +sopno stopst; +sopno lev; /* PLUS nesting level */ +{ + register int i; + register sopno ss; /* start sop of current subRE */ + register const RCHAR_T *sp; /* start of string matched by it */ + register sopno ssub; /* start sop of subsubRE */ + register sopno esub; /* end sop of subsubRE */ + register const RCHAR_T *ssp; /* start of string matched by subsubRE */ + register const RCHAR_T *dp; + register size_t len; + register int hard; + register sop s; + register RCHAR_T d; + register regoff_t offsave; + register cset *cs; + + AT("back", start, stop, startst, stopst); + sp = start; + + /* get as far as we can with easy stuff */ + hard = 0; + for (ss = startst; !hard && ss < stopst; ss++) { + s = m->g->strip[ss]; + d = m->g->stripdata[ss]; + switch (s) { + case OCHAR: + if (sp == stop || *sp++ != d) + return(NULL); + break; + case OANY: + if (sp == stop) + return(NULL); + sp++; + break; + case OANYOF: + cs = &m->g->sets[d]; + if (sp == stop || !CHIN(cs, *sp++)) + return(NULL); + break; + case OBOL: + if ( (sp == m->beginp && !(m->eflags®_NOTBOL)) || + (sp < m->endp && *(sp-1) == '\n' && + (m->g->cflags®_NEWLINE)) ) + { /* yes */ } + else + return(NULL); + break; + case OEOL: + if ( (sp == m->endp && !(m->eflags®_NOTEOL)) || + (sp < m->endp && *sp == '\n' && + (m->g->cflags®_NEWLINE)) ) + { /* yes */ } + else + return(NULL); + break; + case OBOW: + if (( (sp == m->beginp && !(m->eflags®_NOTBOL)) || + (sp < m->endp && *(sp-1) == '\n' && + (m->g->cflags®_NEWLINE)) || + (sp > m->beginp && + !ISWORD(*(sp-1))) ) && + (sp < m->endp && ISWORD(*sp)) ) + { /* yes */ } + else + return(NULL); + break; + case OEOW: + if (( (sp == m->endp && !(m->eflags®_NOTEOL)) || + (sp < m->endp && *sp == '\n' && + (m->g->cflags®_NEWLINE)) || + (sp < m->endp && !ISWORD(*sp)) ) && + (sp > m->beginp && ISWORD(*(sp-1))) ) + { /* yes */ } + else + return(NULL); + break; + case O_QUEST: + break; + case OOR1: /* matches null but needs to skip */ + ss++; + s = m->g->strip[ss]; + d = m->g->stripdata[ss]; + do { + assert(s == OOR2); + ss += d; + s = m->g->strip[ss]; + d = m->g->stripdata[ss]; + } while (s != O_CH); + /* note that the ss++ gets us past the O_CH */ + break; + default: /* have to make a choice */ + hard = 1; + break; + } + } + if (!hard) { /* that was it! */ + if (sp != stop) + return(NULL); + return(sp); + } + ss--; /* adjust for the for's final increment */ + + /* the hard stuff */ + AT("hard", sp, stop, ss, stopst); + s = m->g->strip[ss]; + d = m->g->stripdata[ss]; + switch (s) { + case OBACK_: /* the vilest depths */ + i = d; + assert(0 < i && i <= m->g->nsub); + if (m->pmatch[i].rm_eo == -1) + return(NULL); + assert(m->pmatch[i].rm_so != -1); + len = m->pmatch[i].rm_eo - m->pmatch[i].rm_so; + assert(stop - m->beginp >= len); + if (sp > stop - len) + return(NULL); /* not enough left to match */ + ssp = m->offp + m->pmatch[i].rm_so; + if (memcmp(sp, ssp, len) != 0) + return(NULL); + while (m->g->strip[ss] != O_BACK || m->g->stripdata[ss] != i) + ss++; + return(backref(m, sp+len, stop, ss+1, stopst, lev)); + break; + case OQUEST_: /* to null or not */ + dp = backref(m, sp, stop, ss+1, stopst, lev); + if (dp != NULL) + return(dp); /* not */ + return(backref(m, sp, stop, ss+d+1, stopst, lev)); + break; + case OPLUS_: + assert(m->lastpos != NULL); + assert(lev+1 <= m->g->nplus); + m->lastpos[lev+1] = sp; + return(backref(m, sp, stop, ss+1, stopst, lev+1)); + break; + case O_PLUS: + if (sp == m->lastpos[lev]) /* last pass matched null */ + return(backref(m, sp, stop, ss+1, stopst, lev-1)); + /* try another pass */ + m->lastpos[lev] = sp; + dp = backref(m, sp, stop, ss-d+1, stopst, lev); + if (dp == NULL) + return(backref(m, sp, stop, ss+1, stopst, lev-1)); + else + return(dp); + break; + case OCH_: /* find the right one, if any */ + ssub = ss + 1; + esub = ss + d - 1; + assert(m->g->strip[esub] == OOR1); + for (;;) { /* find first matching branch */ + dp = backref(m, sp, stop, ssub, esub, lev); + if (dp != NULL) + return(dp); + /* that one missed, try next one */ + if (m->g->strip[esub] == O_CH) + return(NULL); /* there is none */ + esub++; + assert(m->g->strip[esub] == OOR2); + ssub = esub + 1; + esub += m->g->stripdata[esub]; + if (m->g->strip[esub] == OOR2) + esub--; + else + assert(m->g->strip[esub] == O_CH); + } + break; + case OLPAREN: /* must undo assignment if rest fails */ + i = d; + assert(0 < i && i <= m->g->nsub); + offsave = m->pmatch[i].rm_so; + m->pmatch[i].rm_so = sp - m->offp; + dp = backref(m, sp, stop, ss+1, stopst, lev); + if (dp != NULL) + return(dp); + m->pmatch[i].rm_so = offsave; + return(NULL); + break; + case ORPAREN: /* must undo assignment if rest fails */ + i = d; + assert(0 < i && i <= m->g->nsub); + offsave = m->pmatch[i].rm_eo; + m->pmatch[i].rm_eo = sp - m->offp; + dp = backref(m, sp, stop, ss+1, stopst, lev); + if (dp != NULL) + return(dp); + m->pmatch[i].rm_eo = offsave; + return(NULL); + break; + default: /* uh oh */ + assert(nope); + break; + } + + /* "can't happen" */ + assert(nope); + /* NOTREACHED */ + return NULL; +} + +/* + - fast - step through the string at top speed + == static const RCHAR_T *fast(register struct match *m, const RCHAR_T *start, \ + == const RCHAR_T *stop, sopno startst, sopno stopst); + */ +static const RCHAR_T * /* where tentative match ended, or NULL */ +fast(m, start, stop, startst, stopst) +register struct match *m; +const RCHAR_T *start; +const RCHAR_T *stop; +sopno startst; +sopno stopst; +{ + register states st = m->st; + register states fresh = m->fresh; + register states tmp = m->tmp; + register const RCHAR_T *p = start; + register RCHAR_T c = (start == m->beginp) ? OUT : *(start-1); + register RCHAR_T lastc; /* previous c */ + register int flag; + register int i; + register const RCHAR_T *coldp; /* last p after which no match was underway */ + + CLEAR(st); + SET1(st, startst); + st = step(m->g, startst, stopst, st, NOTHING, OUT, st); + ASSIGN(fresh, st); + SP("start", st, *p); + coldp = NULL; + for (;;) { + /* next character */ + lastc = c; + c = (p == m->endp) ? OUT : *p; + if (EQ(st, fresh)) + coldp = p; + + /* is there an EOL and/or BOL between lastc and c? */ + flag = 0; + i = 0; + if ( (lastc == '\n' && m->g->cflags®_NEWLINE) || + (lastc == OUT && !(m->eflags®_NOTBOL)) ) { + flag = BOL; + i = m->g->nbol; + } + if ( (c == '\n' && m->g->cflags®_NEWLINE) || + (c == OUT && !(m->eflags®_NOTEOL)) ) { + flag = (flag == BOL) ? BOLEOL : EOL; + i += m->g->neol; + } + if (i != 0) { + for (; i > 0; i--) + st = step(m->g, startst, stopst, st, flag, OUT, st); + SP("boleol", st, c); + } + + /* how about a word boundary? */ + if ( (flag == BOL || (lastc != OUT && !ISWORD(lastc))) && + (c != OUT && ISWORD(c)) ) { + flag = BOW; + } + if ( (lastc != OUT && ISWORD(lastc)) && + (flag == EOL || (c != OUT && !ISWORD(c))) ) { + flag = EOW; + } + if (flag == BOW || flag == EOW) { + st = step(m->g, startst, stopst, st, flag, OUT, st); + SP("boweow", st, c); + } + + /* are we done? */ + if (ISSET(st, stopst) || p == stop) + break; /* NOTE BREAK OUT */ + + /* no, we must deal with this character */ + ASSIGN(tmp, st); + ASSIGN(st, fresh); + assert(c != OUT); + st = step(m->g, startst, stopst, tmp, 0, c, st); + SP("aft", st, c); + assert(EQ(step(m->g, startst, stopst, st, NOTHING, OUT, st), st)); + p++; + } + + assert(coldp != NULL); + m->coldp = coldp; + if (ISSET(st, stopst)) + return(p+1); + else + return(NULL); +} + +/* + - slow - step through the string more deliberately + == static const RCHAR_T *slow(register struct match *m, const RCHAR_T *start, \ + == const RCHAR_T *stop, sopno startst, sopno stopst); + */ +static const RCHAR_T * /* where it ended */ +slow(m, start, stop, startst, stopst) +register struct match *m; +const RCHAR_T *start; +const RCHAR_T *stop; +sopno startst; +sopno stopst; +{ + register states st = m->st; + register states empty = m->empty; + register states tmp = m->tmp; + register const RCHAR_T *p = start; + register RCHAR_T c = (start == m->beginp) ? OUT : *(start-1); + register RCHAR_T lastc; /* previous c */ + register int flag; + register int i; + register const RCHAR_T *matchp; /* last p at which a match ended */ + + AT("slow", start, stop, startst, stopst); + CLEAR(st); + SET1(st, startst); + SP("sstart", st, *p); + st = step(m->g, startst, stopst, st, NOTHING, OUT, st); + matchp = NULL; + for (;;) { + /* next character */ + lastc = c; + c = (p == m->endp) ? OUT : *p; + + /* is there an EOL and/or BOL between lastc and c? */ + flag = 0; + i = 0; + if ( (lastc == '\n' && m->g->cflags®_NEWLINE) || + (lastc == OUT && !(m->eflags®_NOTBOL)) ) { + flag = BOL; + i = m->g->nbol; + } + if ( (c == '\n' && m->g->cflags®_NEWLINE) || + (c == OUT && !(m->eflags®_NOTEOL)) ) { + flag = (flag == BOL) ? BOLEOL : EOL; + i += m->g->neol; + } + if (i != 0) { + for (; i > 0; i--) + st = step(m->g, startst, stopst, st, flag, OUT, st); + SP("sboleol", st, c); + } + + /* how about a word boundary? */ + if ( (flag == BOL || (lastc != OUT && !ISWORD(lastc))) && + (c != OUT && ISWORD(c)) ) { + flag = BOW; + } + if ( (lastc != OUT && ISWORD(lastc)) && + (flag == EOL || (c != OUT && !ISWORD(c))) ) { + flag = EOW; + } + if (flag == BOW || flag == EOW) { + st = step(m->g, startst, stopst, st, flag, OUT, st); + SP("sboweow", st, c); + } + + /* are we done? */ + if (ISSET(st, stopst)) + matchp = p; + if (EQ(st, empty) || p == stop) + break; /* NOTE BREAK OUT */ + + /* no, we must deal with this character */ + ASSIGN(tmp, st); + ASSIGN(st, empty); + assert(c != OUT); + st = step(m->g, startst, stopst, tmp, 0, c, st); + SP("saft", st, c); + assert(EQ(step(m->g, startst, stopst, st, NOTHING, OUT, st), st)); + p++; + } + + return(matchp); +} + + +/* + - step - map set of states reachable before char to set reachable after + == static states step(register struct re_guts *g, sopno start, sopno stop, \ + == register states bef, int flag, RCHAR_T ch, register states aft); + == #define BOL (1) + == #define EOL (BOL+1) + == #define BOLEOL (BOL+2) + == #define NOTHING (BOL+3) + == #define BOW (BOL+4) + == #define EOW (BOL+5) + */ +static states +step(g, start, stop, bef, flag, ch, aft) +register struct re_guts *g; +sopno start; /* start state within strip */ +sopno stop; /* state after stop state within strip */ +register states bef; /* states reachable before */ +int flag; /* NONCHAR flag */ +RCHAR_T ch; /* character code */ +register states aft; /* states already known reachable after */ +{ + register cset *cs; + register sop s; + register RCHAR_T d; + register sopno pc; + register onestate here; /* note, macros know this name */ + register sopno look; + register int i; + + for (pc = start, INIT(here, pc); pc != stop; pc++, INC(here)) { + s = g->strip[pc]; + d = g->stripdata[pc]; + switch (s) { + case OEND: + assert(pc == stop-1); + break; + case OCHAR: + /* only characters can match */ + assert(!flag || ch != d); + if (ch == d) + FWD(aft, bef, 1); + break; + case OBOL: + if (flag == BOL || flag == BOLEOL) + FWD(aft, bef, 1); + break; + case OEOL: + if (flag == EOL || flag == BOLEOL) + FWD(aft, bef, 1); + break; + case OBOW: + if (flag == BOW) + FWD(aft, bef, 1); + break; + case OEOW: + if (flag == EOW) + FWD(aft, bef, 1); + break; + case OANY: + if (!flag) + FWD(aft, bef, 1); + break; + case OANYOF: + cs = &g->sets[d]; + if (!flag && CHIN(cs, ch)) + FWD(aft, bef, 1); + break; + case OBACK_: /* ignored here */ + case O_BACK: + FWD(aft, aft, 1); + break; + case OPLUS_: /* forward, this is just an empty */ + FWD(aft, aft, 1); + break; + case O_PLUS: /* both forward and back */ + FWD(aft, aft, 1); + i = ISSETBACK(aft, d); + BACK(aft, aft, d); + if (!i && ISSETBACK(aft, d)) { + /* oho, must reconsider loop body */ + pc -= d + 1; + INIT(here, pc); + } + break; + case OQUEST_: /* two branches, both forward */ + FWD(aft, aft, 1); + FWD(aft, aft, d); + break; + case O_QUEST: /* just an empty */ + FWD(aft, aft, 1); + break; + case OLPAREN: /* not significant here */ + case ORPAREN: + FWD(aft, aft, 1); + break; + case OCH_: /* mark the first two branches */ + FWD(aft, aft, 1); + assert(OP(g->strip[pc+d]) == OOR2); + FWD(aft, aft, d); + break; + case OOR1: /* done a branch, find the O_CH */ + if (ISSTATEIN(aft, here)) { + for (look = 1; /**/; look += d) { + s = g->strip[pc+look]; + d = g->stripdata[pc+look]; + if (s == O_CH) + break; + assert(s == OOR2); + } + FWD(aft, aft, look); + } + break; + case OOR2: /* propagate OCH_'s marking */ + FWD(aft, aft, 1); + if (g->strip[pc+d] != O_CH) { + assert(g->strip[pc+d] == OOR2); + FWD(aft, aft, d); + } + break; + case O_CH: /* just empty */ + FWD(aft, aft, 1); + break; + default: /* ooooops... */ + assert(nope); + break; + } + } + + return(aft); +} + +#ifdef REDEBUG +/* + - print - print a set of states + == #ifdef REDEBUG + == static void print(struct match *m, char *caption, states st, \ + == int ch, FILE *d); + == #endif + */ +static void +print(m, caption, st, ch, d) +struct match *m; +char *caption; +states st; +int ch; +FILE *d; +{ + register struct re_guts *g = m->g; + register int i; + register int first = 1; + + if (!(m->eflags®_TRACE)) + return; + + fprintf(d, "%s", caption); + if (ch != '\0') + fprintf(d, " %s", pchar(ch)); + for (i = 0; i < g->nstates; i++) + if (ISSET(st, i)) { + fprintf(d, "%s%d", (first) ? "\t" : ", ", i); + first = 0; + } + fprintf(d, "\n"); +} + +/* + - at - print current situation + == #ifdef REDEBUG + == static void at(struct match *m, char *title, char *start, char *stop, \ + == sopno startst, sopno stopst); + == #endif + */ +static void +at(m, title, start, stop, startst, stopst) +struct match *m; +char *title; +char *start; +char *stop; +sopno startst; +sopno stopst; +{ + if (!(m->eflags®_TRACE)) + return; + + printf("%s %s-", title, pchar(*start)); + printf("%s ", pchar(*stop)); + printf("%ld-%ld\n", (long)startst, (long)stopst); +} + +#ifndef PCHARDONE +#define PCHARDONE /* never again */ +/* + - pchar - make a character printable + == #ifdef REDEBUG + == static char *pchar(int ch); + == #endif + * + * Is this identical to regchar() over in debug.c? Well, yes. But a + * duplicate here avoids having a debugging-capable regexec.o tied to + * a matching debug.o, and this is convenient. It all disappears in + * the non-debug compilation anyway, so it doesn't matter much. + */ +static char * /* -> representation */ +pchar(ch) +int ch; +{ + static char pbuf[10]; + + if (isprint(ch) || ch == ' ') + snprintf(pbuf, sizeof(pbuf), "%c", ch); + else + snprintf(pbuf, sizeof(pbuf), "\\%o", ch); + return(pbuf); +} +#endif +#endif + +#undef matcher +#undef fast +#undef slow +#undef dissect +#undef backref +#undef step +#undef print +#undef at +#undef match diff --git a/contrib/nvi/regex/re_format.7 b/contrib/nvi/regex/re_format.7 new file mode 100644 index 0000000..61d1aea --- /dev/null +++ b/contrib/nvi/regex/re_format.7 @@ -0,0 +1,271 @@ +.\" $NetBSD: re_format.7,v 1.1.1.2 2008/05/18 14:31:37 aymeric Exp $ +.\" +.\" Copyright (c) 1992, 1993, 1994 Henry Spencer. +.\" Copyright (c) 1992, 1993, 1994 +.\" The Regents of the University of California. All rights reserved. +.\" +.\" This code is derived from software contributed to Berkeley by +.\" Henry Spencer of the University of Toronto. +.\" +.\" Redistribution and use in source and binary forms, with or without +.\" modification, are permitted provided that the following conditions +.\" are met: +.\" 1. Redistributions of source code must retain the above copyright +.\" notice, this list of conditions and the following disclaimer. +.\" 2. Redistributions in binary form must reproduce the above copyright +.\" notice, this list of conditions and the following disclaimer in the +.\" documentation and/or other materials provided with the distribution. +.\" 3. All advertising materials mentioning features or use of this software +.\" must display the following acknowledgement: +.\" This product includes software developed by the University of +.\" California, Berkeley and its contributors. +.\" 4. Neither the name of the University nor the names of its contributors +.\" may be used to endorse or promote products derived from this software +.\" without specific prior written permission. +.\" +.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND +.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE +.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE +.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE +.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL +.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS +.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) +.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT +.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY +.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF +.\" SUCH DAMAGE. +.\" +.\" @(#)re_format.7 8.2 (Berkeley) 3/16/94 +.\" +.TH RE_FORMAT 7 "March 16, 1994" +.SH NAME +re_format \- POSIX 1003.2 regular expressions +.SH DESCRIPTION +Regular expressions (``RE''s), +as defined in POSIX 1003.2, come in two forms: +modern REs (roughly those of +.IR egrep ; +1003.2 calls these ``extended'' REs) +and obsolete REs (roughly those of +.IR ed ; +1003.2 ``basic'' REs). +Obsolete REs mostly exist for backward compatibility in some old programs; +they will be discussed at the end. +1003.2 leaves some aspects of RE syntax and semantics open; +`\(dg' marks decisions on these aspects that +may not be fully portable to other 1003.2 implementations. +.PP +A (modern) RE is one\(dg or more non-empty\(dg \fIbranches\fR, +separated by `|'. +It matches anything that matches one of the branches. +.PP +A branch is one\(dg or more \fIpieces\fR, concatenated. +It matches a match for the first, followed by a match for the second, etc. +.PP +A piece is an \fIatom\fR possibly followed +by a single\(dg `*', `+', `?', or \fIbound\fR. +An atom followed by `*' matches a sequence of 0 or more matches of the atom. +An atom followed by `+' matches a sequence of 1 or more matches of the atom. +An atom followed by `?' matches a sequence of 0 or 1 matches of the atom. +.PP +A \fIbound\fR is `{' followed by an unsigned decimal integer, +possibly followed by `,' +possibly followed by another unsigned decimal integer, +always followed by `}'. +The integers must lie between 0 and RE_DUP_MAX (255\(dg) inclusive, +and if there are two of them, the first may not exceed the second. +An atom followed by a bound containing one integer \fIi\fR +and no comma matches +a sequence of exactly \fIi\fR matches of the atom. +An atom followed by a bound +containing one integer \fIi\fR and a comma matches +a sequence of \fIi\fR or more matches of the atom. +An atom followed by a bound +containing two integers \fIi\fR and \fIj\fR matches +a sequence of \fIi\fR through \fIj\fR (inclusive) matches of the atom. +.PP +An atom is a regular expression enclosed in `()' (matching a match for the +regular expression), +an empty set of `()' (matching the null string)\(dg, +a \fIbracket expression\fR (see below), `.' +(matching any single character), `^' (matching the null string at the +beginning of a line), `$' (matching the null string at the +end of a line), a `\e' followed by one of the characters +`^.[$()|*+?{\e' +(matching that character taken as an ordinary character), +a `\e' followed by any other character\(dg +(matching that character taken as an ordinary character, +as if the `\e' had not been present\(dg), +or a single character with no other significance (matching that character). +A `{' followed by a character other than a digit is an ordinary +character, not the beginning of a bound\(dg. +It is illegal to end an RE with `\e'. +.PP +A \fIbracket expression\fR is a list of characters enclosed in `[]'. +It normally matches any single character from the list (but see below). +If the list begins with `^', +it matches any single character +(but see below) \fInot\fR from the rest of the list. +If two characters in the list are separated by `\-', this is shorthand +for the full \fIrange\fR of characters between those two (inclusive) in the +collating sequence, +e.g. `[0-9]' in ASCII matches any decimal digit. +It is illegal\(dg for two ranges to share an +endpoint, e.g. `a-c-e'. +Ranges are very collating-sequence-dependent, +and portable programs should avoid relying on them. +.PP +To include a literal `]' in the list, make it the first character +(following a possible `^'). +To include a literal `\-', make it the first or last character, +or the second endpoint of a range. +To use a literal `\-' as the first endpoint of a range, +enclose it in `[.' and `.]' to make it a collating element (see below). +With the exception of these and some combinations using `[' (see next +paragraphs), all other special characters, including `\e', lose their +special significance within a bracket expression. +.PP +Within a bracket expression, a collating element (a character, +a multi-character sequence that collates as if it were a single character, +or a collating-sequence name for either) +enclosed in `[.' and `.]' stands for the +sequence of characters of that collating element. +The sequence is a single element of the bracket expression's list. +A bracket expression containing a multi-character collating element +can thus match more than one character, +e.g. if the collating sequence includes a `ch' collating element, +then the RE `[[.ch.]]*c' matches the first five characters +of `chchcc'. +.PP +Within a bracket expression, a collating element enclosed in `[=' and +`=]' is an equivalence class, standing for the sequences of characters +of all collating elements equivalent to that one, including itself. +(If there are no other equivalent collating elements, +the treatment is as if the enclosing delimiters were `[.' and `.]'.) +For example, if o and \o'o^' are the members of an equivalence class, +then `[[=o=]]', `[[=\o'o^'=]]', and `[o\o'o^']' are all synonymous. +An equivalence class may not\(dg be an endpoint +of a range. +.PP +Within a bracket expression, the name of a \fIcharacter class\fR enclosed +in `[:' and `:]' stands for the list of all characters belonging to that +class. +Standard character class names are: +.PP +.RS +.nf +.ta 3c 6c 9c +alnum digit punct +alpha graph space +blank lower upper +cntrl print xdigit +.fi +.RE +.PP +These stand for the character classes defined in +.IR ctype (3). +A locale may provide others. +A character class may not be used as an endpoint of a range. +.PP +There are two special cases\(dg of bracket expressions: +the bracket expressions `[[:<:]]' and `[[:>:]]' match the null string at +the beginning and end of a word respectively. +A word is defined as a sequence of +word characters +which is neither preceded nor followed by +word characters. +A word character is an +.I alnum +character (as defined by +.IR ctype (3)) +or an underscore. +This is an extension, +compatible with but not specified by POSIX 1003.2, +and should be used with +caution in software intended to be portable to other systems. +.PP +In the event that an RE could match more than one substring of a given +string, +the RE matches the one starting earliest in the string. +If the RE could match more than one substring starting at that point, +it matches the longest. +Subexpressions also match the longest possible substrings, subject to +the constraint that the whole match be as long as possible, +with subexpressions starting earlier in the RE taking priority over +ones starting later. +Note that higher-level subexpressions thus take priority over +their lower-level component subexpressions. +.PP +Match lengths are measured in characters, not collating elements. +A null string is considered longer than no match at all. +For example, +`bb*' matches the three middle characters of `abbbc', +`(wee|week)(knights|nights)' matches all ten characters of `weeknights', +when `(.*).*' is matched against `abc' the parenthesized subexpression +matches all three characters, and +when `(a*)*' is matched against `bc' both the whole RE and the parenthesized +subexpression match the null string. +.PP +If case-independent matching is specified, +the effect is much as if all case distinctions had vanished from the +alphabet. +When an alphabetic that exists in multiple cases appears as an +ordinary character outside a bracket expression, it is effectively +transformed into a bracket expression containing both cases, +e.g. `x' becomes `[xX]'. +When it appears inside a bracket expression, all case counterparts +of it are added to the bracket expression, so that (e.g.) `[x]' +becomes `[xX]' and `[^x]' becomes `[^xX]'. +.PP +No particular limit is imposed on the length of REs\(dg. +Programs intended to be portable should not employ REs longer +than 256 bytes, +as an implementation can refuse to accept such REs and remain +POSIX-compliant. +.PP +Obsolete (``basic'') regular expressions differ in several respects. +`|', `+', and `?' are ordinary characters and there is no equivalent +for their functionality. +The delimiters for bounds are `\e{' and `\e}', +with `{' and `}' by themselves ordinary characters. +The parentheses for nested subexpressions are `\e(' and `\e)', +with `(' and `)' by themselves ordinary characters. +`^' is an ordinary character except at the beginning of the +RE or\(dg the beginning of a parenthesized subexpression, +`$' is an ordinary character except at the end of the +RE or\(dg the end of a parenthesized subexpression, +and `*' is an ordinary character if it appears at the beginning of the +RE or the beginning of a parenthesized subexpression +(after a possible leading `^'). +Finally, there is one new type of atom, a \fIback reference\fR: +`\e' followed by a non-zero decimal digit \fId\fR +matches the same sequence of characters +matched by the \fId\fRth parenthesized subexpression +(numbering subexpressions by the positions of their opening parentheses, +left to right), +so that (e.g.) `\e([bc]\e)\e1' matches `bb' or `cc' but not `bc'. +.SH SEE ALSO +regex(3) +.PP +POSIX 1003.2, section 2.8 (Regular Expression Notation). +.SH BUGS +Having two kinds of REs is a botch. +.PP +The current 1003.2 spec says that `)' is an ordinary character in +the absence of an unmatched `('; +this was an unintentional result of a wording error, +and change is likely. +Avoid relying on it. +.PP +Back references are a dreadful botch, +posing major problems for efficient implementations. +They are also somewhat vaguely defined +(does +`a\e(\e(b\e)*\e2\e)*d' match `abbbd'?). +Avoid using them. +.PP +1003.2's specification of case-independent matching is vague. +The ``one case implies all cases'' definition given above +is current consensus among implementors as to the right interpretation. +.PP +The syntax for word boundaries is incredibly ugly. diff --git a/contrib/nvi/regex/regcomp.c b/contrib/nvi/regex/regcomp.c new file mode 100644 index 0000000..8f7438f --- /dev/null +++ b/contrib/nvi/regex/regcomp.c @@ -0,0 +1,1737 @@ +/* $NetBSD: regcomp.c,v 1.7 2011/11/19 17:45:11 tnozaki Exp $ */ + +/*- + * Copyright (c) 1992, 1993, 1994 Henry Spencer. + * Copyright (c) 1992, 1993, 1994 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Henry Spencer of the University of Toronto. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * @(#)regcomp.c 8.4 (Berkeley) 3/19/94 + */ + +#if defined(LIBC_SCCS) && !defined(lint) +static char sccsid[] = "@(#)regcomp.c 8.4 (Berkeley) 3/19/94"; +#endif /* LIBC_SCCS and not lint */ + +#include <sys/types.h> +#include <stdio.h> +#include <string.h> +#include <ctype.h> +#include <limits.h> +#include <stdlib.h> +#include <regex.h> + +#include "utils.h" +#include "regex2.h" + +#include "cclass.h" +#include "cname.h" + +/* + * parse structure, passed up and down to avoid global variables and + * other clumsinesses + */ +struct parse { + RCHAR_T *next; /* next character in RE */ + RCHAR_T *end; /* end of string (-> NUL normally) */ + int error; /* has an error been seen? */ + sop *strip; /* malloced strip */ + RCHAR_T *stripdata; /* malloced stripdata */ + sopno ssize; /* malloced strip size (allocated) */ + sopno slen; /* malloced strip length (used) */ + int ncsalloc; /* number of csets allocated */ + struct re_guts *g; +# define NPAREN 10 /* we need to remember () 1-9 for back refs */ + sopno pbegin[NPAREN]; /* -> ( ([0] unused) */ + sopno pend[NPAREN]; /* -> ) ([0] unused) */ +}; + +/* ========= begin header generated by ./mkh ========= */ +#ifdef __cplusplus +extern "C" { +#endif + +/* === regcomp.c === */ +static void p_ere __P((struct parse *p, int stop, size_t reclimit)); +static void p_ere_exp __P((struct parse *p, size_t reclimit)); +static void p_str __P((struct parse *p)); +static void p_bre __P((struct parse *p, int end1, int end2, size_t reclimit)); +static int p_simp_re __P((struct parse *p, int starordinary, size_t reclimit)); +static int p_count __P((struct parse *p)); +static void p_bracket __P((struct parse *p)); +static void p_b_term __P((struct parse *p, cset *cs)); +static void p_b_cclass __P((struct parse *p, cset *cs)); +static void p_b_eclass __P((struct parse *p, cset *cs)); +static char p_b_symbol __P((struct parse *p)); +static char p_b_coll_elem __P((struct parse *p, int endc)); +static char othercase __P((int ch)); +static void bothcases __P((struct parse *p, int ch)); +static void ordinary __P((struct parse *p, int ch)); +static void nonnewline __P((struct parse *p)); +static void repeat __P((struct parse *p, sopno start, int from, int to, size_t reclimit)); +static int seterr __P((struct parse *p, int e)); +static cset *allocset __P((struct parse *p)); +static void freeset __P((struct parse *p, cset *cs)); +static int freezeset __P((struct parse *p, cset *cs)); +static int firstch __P((struct parse *p, cset *cs)); +static int nch __P((struct parse *p, cset *cs)); +static void mcadd __P((struct parse *p, cset *cs, const char *cp)); +#ifdef notdef +static void mcsub __P((cset *cs, char *cp)); +static int mcin __P((cset *cs, char *cp)); +static char *mcfind __P((cset *cs, char *cp)); +#endif +static void mcinvert __P((struct parse *p, cset *cs)); +static void mccase __P((struct parse *p, cset *cs)); +#ifdef notdef +static int isinsets __P((struct re_guts *g, int c)); +static int samesets __P((struct re_guts *g, int c1, int c2)); +#endif +static void categorize __P((struct parse *p, struct re_guts *g)); +static sopno dupl __P((struct parse *p, sopno start, sopno finish)); +static void doemit __P((struct parse *p, sop op, size_t opnd)); +static void doinsert __P((struct parse *p, sop op, size_t opnd, sopno pos)); +static void dofwd __P((struct parse *p, sopno pos, sop value)); +static int enlarge __P((struct parse *p, sopno size)); +static void stripsnug __P((struct parse *p, struct re_guts *g)); +static void findmust __P((struct parse *p, struct re_guts *g)); +static sopno pluscount __P((struct parse *p, struct re_guts *g)); + +#ifdef __cplusplus +} +#endif +/* ========= end header generated by ./mkh ========= */ + +static RCHAR_T nuls[10]; /* place to point scanner in event of error */ + +/* + * macros for use with parse structure + * BEWARE: these know that the parse structure is named `p' !!! + */ +#define PEEK() (*p->next) +#define PEEK2() (*(p->next+1)) +#define MORE() (p->next < p->end) +#define MORE2() (p->next+1 < p->end) +#define SEE(c) (MORE() && PEEK() == (c)) +#define SEETWO(a, b) (MORE() && MORE2() && PEEK() == (a) && PEEK2() == (b)) +#define EAT(c) ((SEE(c)) ? (NEXT(), 1) : 0) +#define EATTWO(a, b) ((SEETWO(a, b)) ? (NEXT2(), 1) : 0) +#define NEXT() (p->next++) +#define NEXT2() (p->next += 2) +#define NEXTn(n) (p->next += (n)) +#define GETNEXT() (*p->next++) +#define SETERROR(e) seterr(p, (e)) +#define REQUIRE(co, e) ((co) || SETERROR(e)) +#define MUSTSEE(c, e) (REQUIRE(MORE() && PEEK() == (c), e)) +#define MUSTEAT(c, e) (REQUIRE(MORE() && GETNEXT() == (c), e)) +#define MUSTNOTSEE(c, e) (REQUIRE(!MORE() || PEEK() != (c), e)) +#define EMIT(op, sopnd) doemit(p, (sop)(op), (size_t)(sopnd)) +#define INSERT(op, pos) doinsert(p, (sop)(op), HERE()-(pos)+1, pos) +#define AHEAD(pos) dofwd(p, pos, HERE()-(pos)) +#define ASTERN(sop, pos) EMIT(sop, HERE()-pos) +#define HERE() (p->slen) +#define THERE() (p->slen - 1) +#define THERETHERE() (p->slen - 2) +#define DROP(n) (p->slen -= (n)) + +#ifndef NDEBUG +static int never = 0; /* for use in asserts; shuts lint up */ +#else +#define never 0 /* some <assert.h>s have bugs too */ +#endif + +#define MEMLIMIT 0x8000000 +#define MEMSIZE(p) \ + ((p)->ncsalloc / CHAR_BIT * (p)->g->csetsize + \ + (p)->ncsalloc * sizeof(cset) + \ + (p)->ssize * sizeof(sop)) +#define RECLIMIT 256 + +/* + - regcomp - interface for parser and compilation + = extern int regcomp(regex_t *, const RCHAR_T *, int); + = #define REG_BASIC 0000 + = #define REG_EXTENDED 0001 + = #define REG_ICASE 0002 + = #define REG_NOSUB 0004 + = #define REG_NEWLINE 0010 + = #define REG_NOSPEC 0020 + = #define REG_PEND 0040 + = #define REG_DUMP 0200 + */ +int /* 0 success, otherwise REG_something */ +regcomp(regex_t *preg, const RCHAR_T *pattern, int cflags) +{ + struct parse pa; + register struct re_guts *g; + register struct parse *p = &pa; + register int i; + register size_t len; +#ifdef REDEBUG +# define GOODFLAGS(f) (f) +#else +# define GOODFLAGS(f) ((f)&~REG_DUMP) +#endif + + cflags = GOODFLAGS(cflags); + if ((cflags®_EXTENDED) && (cflags®_NOSPEC)) + return(REG_INVARG); + + if (cflags®_PEND) { + if (preg->re_endp < pattern) + return(REG_INVARG); + len = preg->re_endp - pattern; + } else + len = STRLEN(pattern); + + /* do the mallocs early so failure handling is easy */ + g = (struct re_guts *)malloc(sizeof(struct re_guts) + + (NC-1)*sizeof(cat_t)); + if (g == NULL) + return(REG_ESPACE); + p->ssize = len/(size_t)2*(size_t)3 + (size_t)1; /* ugh */ + p->strip = (sop *)malloc(p->ssize * sizeof(sop)); + if (p->strip == NULL) { + free((char *)g); + return(REG_ESPACE); + } + p->stripdata = (RCHAR_T *)malloc(p->ssize * sizeof(RCHAR_T)); + if (p->stripdata == NULL) { + free((char *)p->strip); + free((char *)g); + return(REG_ESPACE); + } + p->slen = 0; + + /* set things up */ + p->g = g; + p->next = (RCHAR_T *)pattern; /* convenience; we do not modify it */ + p->end = p->next + len; + p->error = 0; + p->ncsalloc = 0; + for (i = 0; i < NPAREN; i++) { + p->pbegin[i] = 0; + p->pend[i] = 0; + } + g->csetsize = NC; + g->sets = NULL; + g->setbits = NULL; + g->ncsets = 0; + g->cflags = cflags; + g->iflags = 0; + g->nbol = 0; + g->neol = 0; + g->must = NULL; + g->mlen = 0; + g->nsub = 0; +#if 0 + g->ncategories = 1; /* category 0 is "everything else" */ + g->categories = &g->catspace[-(CHAR_MIN)]; + (void) memset((char *)g->catspace, 0, NC*sizeof(cat_t)); +#endif + g->backrefs = 0; + + /* do it */ + EMIT(OEND, 0); + g->firststate = THERE(); + if (cflags®_EXTENDED) + p_ere(p, OUT, 0); + else if (cflags®_NOSPEC) + p_str(p); + else + p_bre(p, OUT, OUT, 0); + EMIT(OEND, 0); + g->laststate = THERE(); + + /* tidy up loose ends and fill things in */ + categorize(p, g); + stripsnug(p, g); + findmust(p, g); + g->nplus = pluscount(p, g); + g->magic = MAGIC2; + preg->re_nsub = g->nsub; + preg->re_g = g; + preg->re_magic = MAGIC1; +#ifndef REDEBUG + /* not debugging, so can't rely on the assert() in regexec() */ + if (g->iflags&BAD) + SETERROR(REG_ASSERT); +#endif + + /* win or lose, we're done */ + if (p->error != 0) /* lose */ + regfree(preg); + return(p->error); +} + +/* + - p_ere - ERE parser top level, concatenation and alternation + == static void p_ere(register struct parse *p, int stop, size_t reclimit); + */ +static void +p_ere(register struct parse *p, int stop, size_t reclimit) + + /* character this ERE should end at */ +{ + register char c; + register sopno prevback = 0; + register sopno prevfwd = 0; + register sopno conc; + register int first = 1; /* is this the first alternative? */ + + if (reclimit++ > RECLIMIT || p->error == REG_ESPACE) { + p->error = REG_ESPACE; + return; + } + + for (;;) { + /* do a bunch of concatenated expressions */ + conc = HERE(); + while (MORE() && (c = PEEK()) != '|' && c != stop) + p_ere_exp(p, reclimit); + (void)REQUIRE(HERE() != conc, REG_EMPTY); /* require nonempty */ + + if (!EAT('|')) + break; /* NOTE BREAK OUT */ + + if (first) { + INSERT(OCH_, conc); /* offset is wrong */ + prevfwd = conc; + prevback = conc; + first = 0; + } + ASTERN(OOR1, prevback); + prevback = THERE(); + AHEAD(prevfwd); /* fix previous offset */ + prevfwd = HERE(); + EMIT(OOR2, 0); /* offset is very wrong */ + } + + if (!first) { /* tail-end fixups */ + AHEAD(prevfwd); + ASTERN(O_CH, prevback); + } + + assert(!MORE() || SEE(stop)); +} + +/* + - p_ere_exp - parse one subERE, an atom possibly followed by a repetition op + == static void p_ere_exp(register struct parse *p); + */ +static void +p_ere_exp(register struct parse *p, size_t reclimit) +{ + register char c; + register sopno pos; + register int count; + register int count2; + register sopno subno; + int wascaret = 0; + + assert(MORE()); /* caller should have ensured this */ + c = GETNEXT(); + + pos = HERE(); + switch (c) { + case '(': + (void)REQUIRE(MORE(), REG_EPAREN); + p->g->nsub++; + subno = p->g->nsub; + if (subno < NPAREN) + p->pbegin[subno] = HERE(); + EMIT(OLPAREN, subno); + if (!SEE(')')) + p_ere(p, ')', reclimit); + if (subno < NPAREN) { + p->pend[subno] = HERE(); + assert(p->pend[subno] != 0); + } + EMIT(ORPAREN, subno); + (void)MUSTEAT(')', REG_EPAREN); + break; +#ifndef POSIX_MISTAKE + case ')': /* happens only if no current unmatched ( */ + /* + * You may ask, why the ifndef? Because I didn't notice + * this until slightly too late for 1003.2, and none of the + * other 1003.2 regular-expression reviewers noticed it at + * all. So an unmatched ) is legal POSIX, at least until + * we can get it fixed. + */ + SETERROR(REG_EPAREN); + break; +#endif + case '^': + EMIT(OBOL, 0); + p->g->iflags |= USEBOL; + p->g->nbol++; + wascaret = 1; + break; + case '$': + EMIT(OEOL, 0); + p->g->iflags |= USEEOL; + p->g->neol++; + break; + case '|': + SETERROR(REG_EMPTY); + break; + case '*': + case '+': + case '?': + SETERROR(REG_BADRPT); + break; + case '.': + if (p->g->cflags®_NEWLINE) + nonnewline(p); + else + EMIT(OANY, 0); + break; + case '[': + p_bracket(p); + break; + case '\\': + (void)REQUIRE(MORE(), REG_EESCAPE); + c = GETNEXT(); + ordinary(p, c); + break; + case '{': /* okay as ordinary except if digit follows */ + (void)REQUIRE(!MORE() || !ISDIGIT((UCHAR_T)PEEK()), REG_BADRPT); + /* FALLTHROUGH */ + default: + ordinary(p, c); + break; + } + + if (!MORE()) + return; + c = PEEK(); + /* we call { a repetition if followed by a digit */ + if (!( c == '*' || c == '+' || c == '?' || + (c == '{' && MORE2() && ISDIGIT((UCHAR_T)PEEK2())) )) + return; /* no repetition, we're done */ + NEXT(); + + (void)REQUIRE(!wascaret, REG_BADRPT); + switch (c) { + case '*': /* implemented as +? */ + /* this case does not require the (y|) trick, noKLUDGE */ + INSERT(OPLUS_, pos); + ASTERN(O_PLUS, pos); + INSERT(OQUEST_, pos); + ASTERN(O_QUEST, pos); + break; + case '+': + INSERT(OPLUS_, pos); + ASTERN(O_PLUS, pos); + break; + case '?': + /* KLUDGE: emit y? as (y|) until subtle bug gets fixed */ + INSERT(OCH_, pos); /* offset slightly wrong */ + ASTERN(OOR1, pos); /* this one's right */ + AHEAD(pos); /* fix the OCH_ */ + EMIT(OOR2, 0); /* offset very wrong... */ + AHEAD(THERE()); /* ...so fix it */ + ASTERN(O_CH, THERETHERE()); + break; + case '{': + count = p_count(p); + if (EAT(',')) { + if (ISDIGIT((UCHAR_T)PEEK())) { + count2 = p_count(p); + (void)REQUIRE(count <= count2, REG_BADBR); + } else /* single number with comma */ + count2 = INFINITY; + } else /* just a single number */ + count2 = count; + repeat(p, pos, count, count2, 0); + if (!EAT('}')) { /* error heuristics */ + while (MORE() && PEEK() != '}') + NEXT(); + (void)REQUIRE(MORE(), REG_EBRACE); + SETERROR(REG_BADBR); + } + break; + } + + if (!MORE()) + return; + c = PEEK(); + if (!( c == '*' || c == '+' || c == '?' || + (c == '{' && MORE2() && ISDIGIT((UCHAR_T)PEEK2())) ) ) + return; + SETERROR(REG_BADRPT); +} + +/* + - p_str - string (no metacharacters) "parser" + == static void p_str(register struct parse *p); + */ +static void +p_str(register struct parse *p) +{ + (void)REQUIRE(MORE(), REG_EMPTY); + while (MORE()) + ordinary(p, GETNEXT()); +} + +/* + - p_bre - BRE parser top level, anchoring and concatenation + == static void p_bre(register struct parse *p, register int end1, \ + == register int end2, size_t reclimit); + * Giving end1 as OUT essentially eliminates the end1/end2 check. + * + * This implementation is a bit of a kludge, in that a trailing $ is first + * taken as an ordinary character and then revised to be an anchor. The + * only undesirable side effect is that '$' gets included as a character + * category in such cases. This is fairly harmless; not worth fixing. + * The amount of lookahead needed to avoid this kludge is excessive. + */ +static void +p_bre(register struct parse *p, register int end1, register int end2, size_t reclimit) + + /* first terminating character */ + /* second terminating character */ +{ + register sopno start; + register int first = 1; /* first subexpression? */ + register int wasdollar = 0; + + if (reclimit++ > RECLIMIT || p->error == REG_ESPACE) { + p->error = REG_ESPACE; + return; + } + + start = HERE(); + + if (EAT('^')) { + EMIT(OBOL, 0); + p->g->iflags |= USEBOL; + p->g->nbol++; + } + while (MORE() && !SEETWO(end1, end2)) { + wasdollar = p_simp_re(p, first, reclimit); + first = 0; + } + if (wasdollar) { /* oops, that was a trailing anchor */ + DROP(1); + EMIT(OEOL, 0); + p->g->iflags |= USEEOL; + p->g->neol++; + } + + (void)REQUIRE(HERE() != start, REG_EMPTY); /* require nonempty */ +} + +/* + - p_simp_re - parse a simple RE, an atom possibly followed by a repetition + == static int p_simp_re(register struct parse *p, int starordinary, size_t reclimit); + */ +static int /* was the simple RE an unbackslashed $? */ +p_simp_re(register struct parse *p, int starordinary, size_t reclimit) + + /* is a leading * an ordinary character? */ +{ + register int c; + register int count; + register int count2; + register sopno pos; + register int i; + register sopno subno; + int backsl; + + pos = HERE(); /* repetion op, if any, covers from here */ + + assert(MORE()); /* caller should have ensured this */ + c = GETNEXT(); + backsl = c == '\\'; + if (backsl) { + (void)REQUIRE(MORE(), REG_EESCAPE); + c = (unsigned char)GETNEXT(); + switch (c) { + case '{': + SETERROR(REG_BADRPT); + break; + case '(': + p->g->nsub++; + subno = p->g->nsub; + if (subno < NPAREN) + p->pbegin[subno] = HERE(); + EMIT(OLPAREN, subno); + /* the MORE here is an error heuristic */ + if (MORE() && !SEETWO('\\', ')')) + p_bre(p, '\\', ')', reclimit); + if (subno < NPAREN) { + p->pend[subno] = HERE(); + assert(p->pend[subno] != 0); + } + EMIT(ORPAREN, subno); + (void)REQUIRE(EATTWO('\\', ')'), REG_EPAREN); + break; + case ')': /* should not get here -- must be user */ + case '}': + SETERROR(REG_EPAREN); + break; + case '1': + case '2': + case '3': + case '4': + case '5': + case '6': + case '7': + case '8': + case '9': + i = c - '0'; + assert(i < NPAREN); + if (p->pend[i] != 0) { + assert(i <= p->g->nsub); + EMIT(OBACK_, i); + assert(p->pbegin[i] != 0); + assert(p->strip[p->pbegin[i]] == OLPAREN); + assert(p->strip[p->pend[i]] == ORPAREN); + (void) dupl(p, p->pbegin[i]+1, p->pend[i]); + EMIT(O_BACK, i); + } else + SETERROR(REG_ESUBREG); + p->g->backrefs = 1; + break; + default: + ordinary(p, c); + break; + } + } else { + switch (c) { + case '.': + if (p->g->cflags®_NEWLINE) + nonnewline(p); + else + EMIT(OANY, 0); + break; + case '[': + p_bracket(p); + break; + case '*': + (void)REQUIRE(starordinary, REG_BADRPT); + /* FALLTHROUGH */ + default: + ordinary(p, c); + break; + } + } + + if (EAT('*')) { /* implemented as +? */ + /* this case does not require the (y|) trick, noKLUDGE */ + INSERT(OPLUS_, pos); + ASTERN(O_PLUS, pos); + INSERT(OQUEST_, pos); + ASTERN(O_QUEST, pos); + } else if (EATTWO('\\', '{')) { + count = p_count(p); + if (EAT(',')) { + if (MORE() && ISDIGIT((UCHAR_T)PEEK())) { + count2 = p_count(p); + (void)REQUIRE(count <= count2, REG_BADBR); + } else /* single number with comma */ + count2 = INFINITY; + } else /* just a single number */ + count2 = count; + repeat(p, pos, count, count2, reclimit); + if (!EATTWO('\\', '}')) { /* error heuristics */ + while (MORE() && !SEETWO('\\', '}')) + NEXT(); + (void)REQUIRE(MORE(), REG_EBRACE); + SETERROR(REG_BADBR); + } + } else if (!backsl && c == (unsigned char)'$') /* $ (but not \$) ends it */ + return(1); + + return(0); +} + +/* + - p_count - parse a repetition count + == static int p_count(register struct parse *p); + */ +static int /* the value */ +p_count(register struct parse *p) +{ + register int count = 0; + register int ndigits = 0; + + while (MORE() && ISDIGIT((UCHAR_T)PEEK()) && count <= DUPMAX) { + count = count*10 + (GETNEXT() - '0'); + ndigits++; + } + + (void)REQUIRE(ndigits > 0 && count <= DUPMAX, REG_BADBR); + return(count); +} + +/* + - p_bracket - parse a bracketed character list + == static void p_bracket(register struct parse *p); + * + * Note a significant property of this code: if the allocset() did SETERROR, + * no set operations are done. + */ +static void +p_bracket(register struct parse *p) +{ + register cset *cs; + register int invert = 0; + static RCHAR_T bow[] = { '[', ':', '<', ':', ']', ']' }; + static RCHAR_T eow[] = { '[', ':', '>', ':', ']', ']' }; + + cs = allocset(p); + if (cs == NULL) + return; + + /* Dept of Truly Sickening Special-Case Kludges */ + if (p->next + 5 < p->end && MEMCMP(p->next, bow, 6) == 0) { + EMIT(OBOW, 0); + NEXTn(6); + return; + } + if (p->next + 5 < p->end && MEMCMP(p->next, eow, 6) == 0) { + EMIT(OEOW, 0); + NEXTn(6); + return; + } + + if (EAT('^')) + invert++; /* make note to invert set at end */ + if (EAT(']')) + CHadd(cs, ']'); + else if (EAT('-')) + CHadd(cs, '-'); + while (MORE() && PEEK() != ']' && !SEETWO('-', ']')) + p_b_term(p, cs); + if (EAT('-')) + CHadd(cs, '-'); + (void)MUSTEAT(']', REG_EBRACK); + + if (p->error != 0) /* don't mess things up further */ + return; + + if (p->g->cflags®_ICASE) { + register int i; + register int ci; + + for (i = p->g->csetsize - 1; i >= 0; i--) + if (CHIN(cs, i) && isalpha(i)) { + ci = othercase(i); + if (ci != i) + CHadd(cs, ci); + } + if (cs->multis != NULL) + mccase(p, cs); + } + if (invert) { + register int i; + + for (i = p->g->csetsize - 1; i >= 0; i--) + if (CHIN(cs, i)) + CHsub(cs, i); + else + CHadd(cs, i); + if (p->g->cflags®_NEWLINE) + CHsub(cs, '\n'); + if (cs->multis != NULL) + mcinvert(p, cs); + } + + assert(cs->multis == NULL); /* xxx */ + + if (nch(p, cs) == 1) { /* optimize singleton sets */ + ordinary(p, firstch(p, cs)); + freeset(p, cs); + } else + EMIT(OANYOF, freezeset(p, cs)); +} + +/* + - p_b_term - parse one term of a bracketed character list + == static void p_b_term(register struct parse *p, register cset *cs); + */ +static void +p_b_term(register struct parse *p, register cset *cs) +{ + register char c; + register char start, finish; + register int i; + + /* classify what we've got */ + switch ((MORE()) ? PEEK() : '\0') { + case '[': + c = (MORE2()) ? PEEK2() : '\0'; + break; + case '-': + SETERROR(REG_ERANGE); + return; /* NOTE RETURN */ + break; + default: + c = '\0'; + break; + } + + switch (c) { + case ':': /* character class */ + NEXT2(); + (void)REQUIRE(MORE(), REG_EBRACK); + c = PEEK(); + (void)REQUIRE(c != '-' && c != ']', REG_ECTYPE); + p_b_cclass(p, cs); + (void)REQUIRE(MORE(), REG_EBRACK); + (void)REQUIRE(EATTWO(':', ']'), REG_ECTYPE); + break; + case '=': /* equivalence class */ + NEXT2(); + (void)REQUIRE(MORE(), REG_EBRACK); + c = PEEK(); + (void)REQUIRE(c != '-' && c != ']', REG_ECOLLATE); + p_b_eclass(p, cs); + (void)REQUIRE(MORE(), REG_EBRACK); + (void)REQUIRE(EATTWO('=', ']'), REG_ECOLLATE); + break; + default: /* symbol, ordinary character, or range */ +/* xxx revision needed for multichar stuff */ + start = p_b_symbol(p); + if (SEE('-') && MORE2() && PEEK2() != ']') { + /* range */ + NEXT(); + if (EAT('-')) + finish = '-'; + else + finish = p_b_symbol(p); + } else + finish = start; +/* xxx what about signed chars here... */ + (void)REQUIRE(start <= finish, REG_ERANGE); + for (i = start; i <= finish; i++) + CHadd(cs, i); + break; + } +} + +/* + - p_b_cclass - parse a character-class name and deal with it + == static void p_b_cclass(register struct parse *p, register cset *cs); + */ +static void +p_b_cclass(register struct parse *p, register cset *cs) +{ + register RCHAR_T *sp = p->next; + register struct cclass *cp; + register size_t len; + register const char *u; + register char c; + + while (MORE() && isalpha(PEEK())) + NEXT(); + len = p->next - sp; + for (cp = cclasses; cp->name != NULL; cp++) + if (STRLEN(cp->name) == len && !MEMCMP(cp->name, sp, len)) + break; + if (cp->name == NULL) { + /* oops, didn't find it */ + SETERROR(REG_ECTYPE); + return; + } + + u = cp->chars; + while ((c = *u++) != '\0') + CHadd(cs, c); + for (u = cp->multis; *u != '\0'; u += strlen(u) + 1) + MCadd(p, cs, u); +} + +/* + - p_b_eclass - parse an equivalence-class name and deal with it + == static void p_b_eclass(register struct parse *p, register cset *cs); + * + * This implementation is incomplete. xxx + */ +static void +p_b_eclass(register struct parse *p, register cset *cs) +{ + register char c; + + c = p_b_coll_elem(p, '='); + CHadd(cs, c); +} + +/* + - p_b_symbol - parse a character or [..]ed multicharacter collating symbol + == static char p_b_symbol(register struct parse *p); + */ +static char /* value of symbol */ +p_b_symbol(register struct parse *p) +{ + register char value; + + (void)REQUIRE(MORE(), REG_EBRACK); + if (!EATTWO('[', '.')) + return(GETNEXT()); + + /* collating symbol */ + value = p_b_coll_elem(p, '.'); + (void)REQUIRE(EATTWO('.', ']'), REG_ECOLLATE); + return(value); +} + +/* + - p_b_coll_elem - parse a collating-element name and look it up + == static char p_b_coll_elem(register struct parse *p, int endc); + */ +static char /* value of collating element */ +p_b_coll_elem(register struct parse *p, int endc) + + /* name ended by endc,']' */ +{ + register RCHAR_T *sp = p->next; + register struct cname *cp; + register size_t len; + + while (MORE() && !SEETWO(endc, ']')) + NEXT(); + if (!MORE()) { + SETERROR(REG_EBRACK); + return(0); + } + len = p->next - sp; + for (cp = cnames; cp->name != NULL; cp++) + if (STRLEN(cp->name) == len && MEMCMP(cp->name, sp, len)) + return(cp->code); /* known name */ + if (len == 1) + return(*sp); /* single character */ + SETERROR(REG_ECOLLATE); /* neither */ + return(0); +} + +/* + - othercase - return the case counterpart of an alphabetic + == static char othercase(int ch); + */ +static char /* if no counterpart, return ch */ +othercase(int ch) +{ + assert(isalpha(ch)); + if (isupper(ch)) + return(tolower(ch)); + else if (islower(ch)) + return(toupper(ch)); + else /* peculiar, but could happen */ + return(ch); +} + +/* + - bothcases - emit a dualcase version of a two-case character + == static void bothcases(register struct parse *p, int ch); + * + * Boy, is this implementation ever a kludge... + */ +static void +bothcases(register struct parse *p, int ch) +{ + register RCHAR_T *oldnext = p->next; + register RCHAR_T *oldend = p->end; + RCHAR_T bracket[3]; + + assert(othercase(ch) != ch); /* p_bracket() would recurse */ + p->next = bracket; + p->end = bracket+2; + bracket[0] = ch; + bracket[1] = ']'; + bracket[2] = '\0'; + p_bracket(p); + assert(p->next == bracket+2); + p->next = oldnext; + p->end = oldend; +} + +/* + - ordinary - emit an ordinary character + == static void ordinary(register struct parse *p, register int ch); + */ +static void +ordinary(register struct parse *p, register int ch) +{ +/* + register cat_t *cap = p->g->categories; +*/ + + if ((p->g->cflags®_ICASE) && isalpha(ch) && othercase(ch) != ch) + bothcases(p, ch); + else { + EMIT(OCHAR, (UCHAR_T)ch); +/* + if (cap[ch] == 0) + cap[ch] = p->g->ncategories++; +*/ + } +} + +/* + - nonnewline - emit REG_NEWLINE version of OANY + == static void nonnewline(register struct parse *p); + * + * Boy, is this implementation ever a kludge... + */ +static void +nonnewline(register struct parse *p) +{ + register RCHAR_T *oldnext = p->next; + register RCHAR_T *oldend = p->end; + RCHAR_T bracket[4]; + + p->next = bracket; + p->end = bracket+3; + bracket[0] = '^'; + bracket[1] = '\n'; + bracket[2] = ']'; + bracket[3] = '\0'; + p_bracket(p); + assert(p->next == bracket+3); + p->next = oldnext; + p->end = oldend; +} + +/* + - repeat - generate code for a bounded repetition, recursively if needed + == static void repeat(register struct parse *p, sopno start, int from, int to, size_t reclimit); + */ +static void +repeat(register struct parse *p, sopno start, int from, int to, size_t reclimit) + + /* operand from here to end of strip */ + /* repeated from this number */ + /* to this number of times (maybe INFINITY) */ +{ + register sopno finish; +# define N 2 +# define INF 3 +# define REP(f, t) ((f)*8 + (t)) +# define MAP(n) (((n) <= 1) ? (n) : ((n) == INFINITY) ? INF : N) + register sopno copy; + + if (reclimit++ > RECLIMIT) + p->error = REG_ESPACE; + if (p->error) + return; + + finish = HERE(); + + assert(from <= to); + + switch (REP(MAP(from), MAP(to))) { + case REP(0, 0): /* must be user doing this */ + DROP(finish-start); /* drop the operand */ + break; + case REP(0, 1): /* as x{1,1}? */ + case REP(0, N): /* as x{1,n}? */ + case REP(0, INF): /* as x{1,}? */ + /* KLUDGE: emit y? as (y|) until subtle bug gets fixed */ + INSERT(OCH_, start); /* offset is wrong... */ + repeat(p, start+1, 1, to, reclimit); + ASTERN(OOR1, start); + AHEAD(start); /* ... fix it */ + EMIT(OOR2, 0); + AHEAD(THERE()); + ASTERN(O_CH, THERETHERE()); + break; + case REP(1, 1): /* trivial case */ + /* done */ + break; + case REP(1, N): /* as x?x{1,n-1} */ + /* KLUDGE: emit y? as (y|) until subtle bug gets fixed */ + INSERT(OCH_, start); + ASTERN(OOR1, start); + AHEAD(start); + EMIT(OOR2, 0); /* offset very wrong... */ + AHEAD(THERE()); /* ...so fix it */ + ASTERN(O_CH, THERETHERE()); + copy = dupl(p, start+1, finish+1); + assert(copy == finish+4); + repeat(p, copy, 1, to-1, reclimit); + break; + case REP(1, INF): /* as x+ */ + INSERT(OPLUS_, start); + ASTERN(O_PLUS, start); + break; + case REP(N, N): /* as xx{m-1,n-1} */ + copy = dupl(p, start, finish); + repeat(p, copy, from-1, to-1, reclimit); + break; + case REP(N, INF): /* as xx{n-1,INF} */ + copy = dupl(p, start, finish); + repeat(p, copy, from-1, to, reclimit); + break; + default: /* "can't happen" */ + SETERROR(REG_ASSERT); /* just in case */ + break; + } +} + +/* + - seterr - set an error condition + == static int seterr(register struct parse *p, int e); + */ +static int /* useless but makes type checking happy */ +seterr(register struct parse *p, int e) +{ + if (p->error == 0) /* keep earliest error condition */ + p->error = e; + p->next = nuls; /* try to bring things to a halt */ + p->end = nuls; + return(0); /* make the return value well-defined */ +} + +/* + - allocset - allocate a set of characters for [] + == static cset *allocset(register struct parse *p); + */ +static cset * +allocset(register struct parse *p) +{ + register int no = p->g->ncsets++; + register size_t nc; + register size_t nbytes; + register cset *cs; + register size_t css = (size_t)p->g->csetsize; + register int i; + + if (no >= p->ncsalloc) { /* need another column of space */ + p->ncsalloc += CHAR_BIT; + nc = p->ncsalloc; + assert(nc % CHAR_BIT == 0); + nbytes = nc / CHAR_BIT * css; + if (MEMSIZE(p) > MEMLIMIT) + goto oomem; + if (p->g->sets == NULL) + p->g->sets = (cset *)malloc(nc * sizeof(cset)); + else + p->g->sets = (cset *)realloc((char *)p->g->sets, + nc * sizeof(cset)); + if (p->g->setbits == NULL) + p->g->setbits = (uch *)malloc(nbytes); + else { + p->g->setbits = (uch *)realloc((char *)p->g->setbits, + nbytes); + /* xxx this isn't right if setbits is now NULL */ + for (i = 0; i < no; i++) + p->g->sets[i].ptr = p->g->setbits + css*(i/CHAR_BIT); + } + if (p->g->sets != NULL && p->g->setbits != NULL) + (void) memset((char *)p->g->setbits + (nbytes - css), + 0, css); + else { +oomem: + no = 0; + SETERROR(REG_ESPACE); + /* caller's responsibility not to do set ops */ + return NULL; + } + } + + cs = &p->g->sets[no]; + cs->ptr = p->g->setbits + css*((no)/CHAR_BIT); + cs->mask = 1 << ((no) % CHAR_BIT); + cs->hash = 0; + cs->smultis = 0; + cs->multis = NULL; + + return(cs); +} + +/* + - freeset - free a now-unused set + == static void freeset(register struct parse *p, register cset *cs); + */ +static void +freeset(register struct parse *p, register cset *cs) +{ + register size_t i; + register cset *top = &p->g->sets[p->g->ncsets]; + register size_t css = (size_t)p->g->csetsize; + + for (i = 0; i < css; i++) + CHsub(cs, i); + if (cs == top-1) /* recover only the easy case */ + p->g->ncsets--; +} + +/* + - freezeset - final processing on a set of characters + == static int freezeset(register struct parse *p, register cset *cs); + * + * The main task here is merging identical sets. This is usually a waste + * of time (although the hash code minimizes the overhead), but can win + * big if REG_ICASE is being used. REG_ICASE, by the way, is why the hash + * is done using addition rather than xor -- all ASCII [aA] sets xor to + * the same value! + */ +static int /* set number */ +freezeset(register struct parse *p, register cset *cs) +{ + register uch h = cs->hash; + register size_t i; + register cset *top = &p->g->sets[p->g->ncsets]; + register cset *cs2; + register size_t css = (size_t)p->g->csetsize; + + /* look for an earlier one which is the same */ + for (cs2 = &p->g->sets[0]; cs2 < top; cs2++) + if (cs2->hash == h && cs2 != cs) { + /* maybe */ + for (i = 0; i < css; i++) + if (!!CHIN(cs2, i) != !!CHIN(cs, i)) + break; /* no */ + if (i == css) + break; /* yes */ + } + + if (cs2 < top) { /* found one */ + freeset(p, cs); + cs = cs2; + } + + return((int)(cs - p->g->sets)); +} + +/* + - firstch - return first character in a set (which must have at least one) + == static int firstch(register struct parse *p, register cset *cs); + */ +static int /* character; there is no "none" value */ +firstch(register struct parse *p, register cset *cs) +{ + register size_t i; + register size_t css = (size_t)p->g->csetsize; + + for (i = 0; i < css; i++) + if (CHIN(cs, i)) + return((char)i); + assert(never); + return(0); /* arbitrary */ +} + +/* + - nch - number of characters in a set + == static int nch(register struct parse *p, register cset *cs); + */ +static int +nch(register struct parse *p, register cset *cs) +{ + register size_t i; + register size_t css = (size_t)p->g->csetsize; + register int n = 0; + + for (i = 0; i < css; i++) + if (CHIN(cs, i)) + n++; + return(n); +} + +/* + - mcadd - add a collating element to a cset + == static void mcadd(register struct parse *p, register cset *cs, \ + == register char *cp); + */ +static void +mcadd(register struct parse *p, register cset *cs, register const char *cp) +{ + register size_t oldend = cs->smultis; + void *np; + + cs->smultis += strlen(cp) + 1; + np = realloc(cs->multis, cs->smultis); + if (np == NULL) { + if (cs->multis) + free(cs->multis); + cs->multis = NULL; + SETERROR(REG_ESPACE); + return; + } + cs->multis = np; + + (void) strlcpy(cs->multis + oldend - 1, cp, cs->smultis - oldend + 1); +} + +#ifdef notdef +/* + - mcsub - subtract a collating element from a cset + == static void mcsub(register cset *cs, register char *cp); + */ +static void +mcsub(register cset *cs, register char *cp) +{ + register char *fp = mcfind(cs, cp); + register size_t len = strlen(fp); + + assert(fp != NULL); + (void) memmove(fp, fp + len + 1, + cs->smultis - (fp + len + 1 - cs->multis)); + cs->smultis -= len; + + if (cs->smultis == 0) { + free(cs->multis); + cs->multis = NULL; + return; + } + + cs->multis = realloc(cs->multis, cs->smultis); + assert(cs->multis != NULL); +} + +/* + - mcin - is a collating element in a cset? + == static int mcin(register cset *cs, register char *cp); + */ +static int +mcin(register cset *cs, register char *cp) +{ + return(mcfind(cs, cp) != NULL); +} + +/* + - mcfind - find a collating element in a cset + == static char *mcfind(register cset *cs, register char *cp); + */ +static char * +mcfind(register cset *cs, register char *cp) +{ + register char *p; + + if (cs->multis == NULL) + return(NULL); + for (p = cs->multis; *p != '\0'; p += strlen(p) + 1) + if (strcmp(cp, p) == 0) + return(p); + return(NULL); +} +#endif + +/* + - mcinvert - invert the list of collating elements in a cset + == static void mcinvert(register struct parse *p, register cset *cs); + * + * This would have to know the set of possibilities. Implementation + * is deferred. + */ +static void +mcinvert(register struct parse *p, register cset *cs) +{ + assert(cs->multis == NULL); /* xxx */ +} + +/* + - mccase - add case counterparts of the list of collating elements in a cset + == static void mccase(register struct parse *p, register cset *cs); + * + * This would have to know the set of possibilities. Implementation + * is deferred. + */ +static void +mccase(register struct parse *p, register cset *cs) +{ + assert(cs->multis == NULL); /* xxx */ +} + +#ifdef notdef +/* + - isinsets - is this character in any sets? + == static int isinsets(register struct re_guts *g, int c); + */ +static int /* predicate */ +isinsets(register struct re_guts *g, int c) +{ + register uch *col; + register int i; + register int ncols = (g->ncsets+(CHAR_BIT-1)) / CHAR_BIT; + register unsigned uc = (unsigned char)c; + + for (i = 0, col = g->setbits; i < ncols; i++, col += g->csetsize) + if (col[uc] != 0) + return(1); + return(0); +} + +/* + - samesets - are these two characters in exactly the same sets? + == static int samesets(register struct re_guts *g, int c1, int c2); + */ +static int /* predicate */ +samesets(register struct re_guts *g, int c1, int c2) +{ + register uch *col; + register int i; + register int ncols = (g->ncsets+(CHAR_BIT-1)) / CHAR_BIT; + register unsigned uc1 = (unsigned char)c1; + register unsigned uc2 = (unsigned char)c2; + + for (i = 0, col = g->setbits; i < ncols; i++, col += g->csetsize) + if (col[uc1] != col[uc2]) + return(0); + return(1); +} +#endif + +/* + - categorize - sort out character categories + == static void categorize(struct parse *p, register struct re_guts *g); + */ +static void +categorize(struct parse *p, register struct re_guts *g) +{ +#ifdef notdef + register cat_t *cats = g->categories; + register int c; + register int c2; + register cat_t cat; + + /* avoid making error situations worse */ + if (p->error != 0) + return; + + for (c = CHAR_MIN; c <= CHAR_MAX; c++) + if (cats[c] == 0 && isinsets(g, c)) { + cat = g->ncategories++; + cats[c] = cat; + for (c2 = c+1; c2 <= CHAR_MAX; c2++) + if (cats[c2] == 0 && samesets(g, c, c2)) + cats[c2] = cat; + } +#endif +} + +/* + - dupl - emit a duplicate of a bunch of sops + == static sopno dupl(register struct parse *p, sopno start, sopno finish); + */ +static sopno /* start of duplicate */ +dupl(register struct parse *p, sopno start, sopno finish) + + /* from here */ + /* to this less one */ +{ + register sopno ret = HERE(); + register sopno len = finish - start; + + assert(finish >= start); + if (len == 0) + return(ret); + if (!enlarge(p, p->ssize + len)) /* this many unexpected additions */ + return ret; + assert(p->ssize >= p->slen + len); + (void) memcpy((char *)(p->strip + p->slen), + (char *)(p->strip + start), (size_t)len*sizeof(sop)); + (void) memcpy((char *)(p->stripdata + p->slen), + (char *)(p->stripdata + start), (size_t)len*sizeof(RCHAR_T)); + p->slen += len; + return(ret); +} + +/* + - doemit - emit a strip operator + == static void doemit(register struct parse *p, sop op, size_t opnd); + * + * It might seem better to implement this as a macro with a function as + * hard-case backup, but it's just too big and messy unless there are + * some changes to the data structures. Maybe later. + */ +static void +doemit(register struct parse *p, sop op, size_t opnd) +{ + /* avoid making error situations worse */ + if (p->error != 0) + return; + + /* deal with oversize operands ("can't happen", more or less) */ + assert(opnd < 1); + + /* deal with undersized strip */ + if (p->slen >= p->ssize) + if (!enlarge(p, (p->ssize+1) / 2 * 3)) /* +50% */ + return; + + /* finally, it's all reduced to the easy case */ + p->strip[p->slen] = op; + p->stripdata[p->slen] = opnd; + p->slen++; +} + +/* + - doinsert - insert a sop into the strip + == static void doinsert(register struct parse *p, sop op, size_t opnd, sopno pos); + */ +static void +doinsert(register struct parse *p, sop op, size_t opnd, sopno pos) +{ + register sopno sn; + register sop s; + register RCHAR_T d; + register int i; + + /* avoid making error situations worse */ + if (p->error != 0) + return; + + sn = HERE(); + EMIT(op, opnd); /* do checks, ensure space */ + assert(HERE() == sn+1); + s = p->strip[sn]; + d = p->stripdata[sn]; + + /* adjust paren pointers */ + assert(pos > 0); + for (i = 1; i < NPAREN; i++) { + if (p->pbegin[i] >= pos) { + p->pbegin[i]++; + } + if (p->pend[i] >= pos) { + p->pend[i]++; + } + } + + memmove((char *)&p->strip[pos+1], (char *)&p->strip[pos], + (HERE()-pos-1)*sizeof(sop)); + memmove((char *)&p->stripdata[pos+1], (char *)&p->stripdata[pos], + (HERE()-pos-1)*sizeof(RCHAR_T)); + p->strip[pos] = s; + p->stripdata[pos] = d; +} + +/* + - dofwd - complete a forward reference + == static void dofwd(register struct parse *p, sopno pos, sop value); + */ +static void +dofwd(register struct parse *p, register sopno pos, sop value) +{ + /* avoid making error situations worse */ + if (p->error != 0) + return; + + assert(value < 1); + p->stripdata[pos] = value; +} + +/* + - enlarge - enlarge the strip + == static int enlarge(register struct parse *p, sopno size); + */ +static int +enlarge(register struct parse *p, register sopno size) +{ + register sop *sp; + register RCHAR_T *dp; + sopno osize; + + if (p->ssize >= size) + return 1; + + osize = p->ssize; + p->ssize = size; + if (MEMSIZE(p) > MEMLIMIT) + goto oomem; + sp = realloc(p->strip, p->ssize * sizeof(sop)); + if (sp == NULL) + goto oomem; + p->strip = sp; + dp = realloc(p->stripdata, p->ssize * sizeof(RCHAR_T)); + if (dp == NULL) { +oomem: + p->ssize = osize; + SETERROR(REG_ESPACE); + return 0; + } + p->stripdata = dp; + return 1; +} + +/* + - stripsnug - compact the strip + == static void stripsnug(register struct parse *p, register struct re_guts *g); + */ +static void +stripsnug(register struct parse *p, register struct re_guts *g) +{ + g->nstates = p->slen; + g->strip = (sop *)realloc((char *)p->strip, + p->slen * sizeof(sop)); + if (g->strip == NULL) { + SETERROR(REG_ESPACE); + g->strip = p->strip; + } + g->stripdata = (RCHAR_T *)realloc((char *)p->stripdata, + p->slen * sizeof(RCHAR_T)); + if (g->stripdata == NULL) { + SETERROR(REG_ESPACE); + g->stripdata = p->stripdata; + } +} + +/* + - findmust - fill in must and mlen with longest mandatory literal string + == static void findmust(register struct parse *p, register struct re_guts *g); + * + * This algorithm could do fancy things like analyzing the operands of | + * for common subsequences. Someday. This code is simple and finds most + * of the interesting cases. + * + * Note that must and mlen got initialized during setup. + */ +static void +findmust(struct parse *p, register struct re_guts *g) +{ + register sop *scans; + register RCHAR_T *scand; + sop *starts = 0; + RCHAR_T *startd = NULL; + register sop *newstarts = 0; + register RCHAR_T *newstartd = NULL; + register sopno newlen; + register sop s; + register RCHAR_T d; + register RCHAR_T *cp; + register sopno i; + + /* avoid making error situations worse */ + if (p->error != 0) + return; + + /* find the longest OCHAR sequence in strip */ + newlen = 0; + scans = g->strip + 1; + scand = g->stripdata + 1; + do { + s = *scans++; + d = *scand++; + switch (s) { + case OCHAR: /* sequence member */ + if (newlen == 0) { /* new sequence */ + newstarts = scans - 1; + newstartd = scand - 1; + } + newlen++; + break; + case OPLUS_: /* things that don't break one */ + case OLPAREN: + case ORPAREN: + break; + case OQUEST_: /* things that must be skipped */ + case OCH_: + scans--; + scand--; + do { + scans += d; + scand += d; + s = *scans; + d = *scand; + /* assert() interferes w debug printouts */ + if (s != O_QUEST && s != O_CH && s != OOR2) { + g->iflags |= BAD; + return; + } + } while (s != O_QUEST && s != O_CH); + /* fallthrough */ + default: /* things that break a sequence */ + if (newlen > g->mlen) { /* ends one */ + starts = newstarts; + startd = newstartd; + g->mlen = newlen; + } + newlen = 0; + break; + } + } while (s != OEND); + + if (g->mlen == 0) /* there isn't one */ + return; + + /* turn it into a character string */ + g->must = malloc(((size_t)g->mlen + 1) * sizeof(RCHAR_T)); + if (g->must == NULL) { /* argh; just forget it */ + g->mlen = 0; + return; + } + cp = g->must; + scans = starts; + scand = startd; + for (i = g->mlen; i > 0; i--) { + for (;;) { + s = *scans++; + d = *scand++; + if (s == OCHAR) + break; + } + assert(cp < g->must + g->mlen); + *cp++ = d; + } + assert(cp == g->must + g->mlen); + *cp++ = '\0'; /* just on general principles */ +} + +/* + - pluscount - count + nesting + == static sopno pluscount(register struct parse *p, register struct re_guts *g); + */ +static sopno /* nesting depth */ +pluscount(struct parse *p, register struct re_guts *g) +{ + register sop *scan; + register sop s; + register sopno plusnest = 0; + register sopno maxnest = 0; + + if (p->error != 0) + return(0); /* there may not be an OEND */ + + scan = g->strip + 1; + do { + s = *scan++; + switch (s) { + case OPLUS_: + plusnest++; + break; + case O_PLUS: + if (plusnest > maxnest) + maxnest = plusnest; + plusnest--; + break; + } + } while (s != OEND); + if (plusnest != 0) + g->iflags |= BAD; + return(maxnest); +} diff --git a/contrib/nvi/regex/regerror.c b/contrib/nvi/regex/regerror.c new file mode 100644 index 0000000..5ff1f6b --- /dev/null +++ b/contrib/nvi/regex/regerror.c @@ -0,0 +1,176 @@ +/* $NetBSD: regerror.c,v 1.2 2008/12/05 22:51:43 christos Exp $ */ + +/*- + * Copyright (c) 1992, 1993, 1994 Henry Spencer. + * Copyright (c) 1992, 1993, 1994 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Henry Spencer of the University of Toronto. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * @(#)regerror.c 8.3 (Berkeley) 3/19/94 + */ + +#if defined(LIBC_SCCS) && !defined(lint) +static char sccsid[] = "@(#)regerror.c 8.3 (Berkeley) 3/19/94"; +#endif /* LIBC_SCCS and not lint */ + +#include <sys/types.h> +#include <stdio.h> +#include <string.h> +#include <ctype.h> +#include <limits.h> +#include <stdlib.h> +#include <regex.h> + +#include "utils.h" + +/* ========= begin header generated by ./mkh ========= */ +#ifdef __cplusplus +extern "C" { +#endif + +/* === regerror.c === */ +static char *regatoi __P((const regex_t *preg, char *localbuf)); + +#ifdef __cplusplus +} +#endif +/* ========= end header generated by ./mkh ========= */ +/* + = #define REG_NOMATCH 1 + = #define REG_BADPAT 2 + = #define REG_ECOLLATE 3 + = #define REG_ECTYPE 4 + = #define REG_EESCAPE 5 + = #define REG_ESUBREG 6 + = #define REG_EBRACK 7 + = #define REG_EPAREN 8 + = #define REG_EBRACE 9 + = #define REG_BADBR 10 + = #define REG_ERANGE 11 + = #define REG_ESPACE 12 + = #define REG_BADRPT 13 + = #define REG_EMPTY 14 + = #define REG_ASSERT 15 + = #define REG_INVARG 16 + = #define REG_ATOI 255 // convert name to number (!) + = #define REG_ITOA 0400 // convert number to name (!) + */ +static struct rerr { + int code; + const char *name; + const char *explain; +} rerrs[] = { + { REG_NOMATCH, "REG_NOMATCH", "regexec() failed to match" }, + { REG_BADPAT, "REG_BADPAT", "invalid regular expression" }, + { REG_ECOLLATE, "REG_ECOLLATE", "invalid collating element" }, + { REG_ECTYPE, "REG_ECTYPE", "invalid character class" }, + { REG_EESCAPE, "REG_EESCAPE", "trailing backslash (\\)" }, + { REG_ESUBREG, "REG_ESUBREG", "invalid backreference number" }, + { REG_EBRACK, "REG_EBRACK", "brackets ([ ]) not balanced" }, + { REG_EPAREN, "REG_EPAREN", "parentheses not balanced" }, + { REG_EBRACE, "REG_EBRACE", "braces not balanced" }, + { REG_BADBR, "REG_BADBR", "invalid repetition count(s)" }, + { REG_ERANGE, "REG_ERANGE", "invalid character range" }, + { REG_ESPACE, "REG_ESPACE", "out of memory" }, + { REG_BADRPT, "REG_BADRPT", "repetition-operator operand invalid" }, + { REG_EMPTY, "REG_EMPTY", "empty (sub)expression" }, + { REG_ASSERT, "REG_ASSERT", "\"can't happen\" -- you found a bug" }, + { REG_INVARG, "REG_INVARG", "invalid argument to regex routine" }, + { 0, "", "*** unknown regexp error code ***" }, +}; + +/* + - regerror - the interface to error numbers + = extern size_t regerror(int, const regex_t *, char *, size_t); + */ +/* ARGSUSED */ +size_t +regerror(int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size) +{ + register struct rerr *r; + register size_t len; + register int target = errcode &~ REG_ITOA; + register const char *s; + char convbuf[50]; + + if (errcode == REG_ATOI) + s = regatoi(preg, convbuf); + else { + for (r = rerrs; r->code != 0; r++) + if (r->code == target) + break; + + if (errcode®_ITOA) { + if (r->code != 0) { + assert(strlen(r->name) < sizeof(convbuf)); + (void) strlcpy(convbuf, r->name, sizeof(convbuf)); + } else + (void) snprintf(convbuf, sizeof(convbuf), + "REG_0x%x", target); + s = convbuf; + } else + s = r->explain; + } + + len = strlen(s) + 1; + if (errbuf_size > 0) { + (void) strlcpy(errbuf, s, errbuf_size); + } + + return(len); +} + +/* + - regatoi - internal routine to implement REG_ATOI + == static char *regatoi(const regex_t *preg, char *localbuf); + */ +static char * +regatoi(const regex_t *preg, char *localbuf) +{ +#if 0 /* we don't seem to use this and it gives a warning. */ + register struct rerr *r; + register size_t siz; + register char *p; + + for (r = rerrs; r->code != 0; r++) + if (strcmp(r->name, preg->re_endp) == 0) + break; + if (r->code == 0) + return("0"); + + sprintf(localbuf, "%d", r->code); +#else + *localbuf = '\0'; +#endif + return(localbuf); +} diff --git a/contrib/nvi/regex/regex.3 b/contrib/nvi/regex/regex.3 new file mode 100644 index 0000000..2c17254 --- /dev/null +++ b/contrib/nvi/regex/regex.3 @@ -0,0 +1,540 @@ +.\" $NetBSD: regex.3,v 1.1.1.2 2008/05/18 14:31:38 aymeric Exp $ +.\" +.\" Copyright (c) 1992, 1993, 1994 Henry Spencer. +.\" Copyright (c) 1992, 1993, 1994 +.\" The Regents of the University of California. All rights reserved. +.\" +.\" This code is derived from software contributed to Berkeley by +.\" Henry Spencer of the University of Toronto. +.\" +.\" Redistribution and use in source and binary forms, with or without +.\" modification, are permitted provided that the following conditions +.\" are met: +.\" 1. Redistributions of source code must retain the above copyright +.\" notice, this list of conditions and the following disclaimer. +.\" 2. Redistributions in binary form must reproduce the above copyright +.\" notice, this list of conditions and the following disclaimer in the +.\" documentation and/or other materials provided with the distribution. +.\" 3. All advertising materials mentioning features or use of this software +.\" must display the following acknowledgement: +.\" This product includes software developed by the University of +.\" California, Berkeley and its contributors. +.\" 4. Neither the name of the University nor the names of its contributors +.\" may be used to endorse or promote products derived from this software +.\" without specific prior written permission. +.\" +.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND +.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE +.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE +.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE +.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL +.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS +.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) +.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT +.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY +.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF +.\" SUCH DAMAGE. +.\" +.\" @(#)regex.3 8.2 (Berkeley) 3/16/94 +.\" +.TH REGEX 3 "March 16, 1994" +.de ZR +.\" one other place knows this name: the SEE ALSO section +.IR re_format (7) \\$1 +.. +.SH NAME +regcomp, regexec, regerror, regfree \- regular-expression library +.SH SYNOPSIS +.ft B +.\".na +#include <sys/types.h> +.br +#include <regex.h> +.HP 10 +int regcomp(regex_t\ *preg, const\ char\ *pattern, int\ cflags); +.HP +int\ regexec(const\ regex_t\ *preg, const\ char\ *string, +size_t\ nmatch, regmatch_t\ pmatch[], int\ eflags); +.HP +size_t\ regerror(int\ errcode, const\ regex_t\ *preg, +char\ *errbuf, size_t\ errbuf_size); +.HP +void\ regfree(regex_t\ *preg); +.\".ad +.ft +.SH DESCRIPTION +These routines implement POSIX 1003.2 regular expressions (``RE''s); +see +.ZR . +.I Regcomp +compiles an RE written as a string into an internal form, +.I regexec +matches that internal form against a string and reports results, +.I regerror +transforms error codes from either into human-readable messages, +and +.I regfree +frees any dynamically-allocated storage used by the internal form +of an RE. +.PP +The header +.I <regex.h> +declares two structure types, +.I regex_t +and +.IR regmatch_t , +the former for compiled internal forms and the latter for match reporting. +It also declares the four functions, +a type +.IR regoff_t , +and a number of constants with names starting with ``REG_''. +.PP +.I Regcomp +compiles the regular expression contained in the +.I pattern +string, +subject to the flags in +.IR cflags , +and places the results in the +.I regex_t +structure pointed to by +.IR preg . +.I Cflags +is the bitwise OR of zero or more of the following flags: +.IP REG_EXTENDED \w'REG_EXTENDED'u+2n +Compile modern (``extended'') REs, +rather than the obsolete (``basic'') REs that +are the default. +.IP REG_BASIC +This is a synonym for 0, +provided as a counterpart to REG_EXTENDED to improve readability. +.IP REG_NOSPEC +Compile with recognition of all special characters turned off. +All characters are thus considered ordinary, +so the ``RE'' is a literal string. +This is an extension, +compatible with but not specified by POSIX 1003.2, +and should be used with +caution in software intended to be portable to other systems. +REG_EXTENDED and REG_NOSPEC may not be used +in the same call to +.IR regcomp . +.IP REG_ICASE +Compile for matching that ignores upper/lower case distinctions. +See +.ZR . +.IP REG_NOSUB +Compile for matching that need only report success or failure, +not what was matched. +.IP REG_NEWLINE +Compile for newline-sensitive matching. +By default, newline is a completely ordinary character with no special +meaning in either REs or strings. +With this flag, +`[^' bracket expressions and `.' never match newline, +a `^' anchor matches the null string after any newline in the string +in addition to its normal function, +and the `$' anchor matches the null string before any newline in the +string in addition to its normal function. +.IP REG_PEND +The regular expression ends, +not at the first NUL, +but just before the character pointed to by the +.I re_endp +member of the structure pointed to by +.IR preg . +The +.I re_endp +member is of type +.IR const\ char\ * . +This flag permits inclusion of NULs in the RE; +they are considered ordinary characters. +This is an extension, +compatible with but not specified by POSIX 1003.2, +and should be used with +caution in software intended to be portable to other systems. +.PP +When successful, +.I regcomp +returns 0 and fills in the structure pointed to by +.IR preg . +One member of that structure +(other than +.IR re_endp ) +is publicized: +.IR re_nsub , +of type +.IR size_t , +contains the number of parenthesized subexpressions within the RE +(except that the value of this member is undefined if the +REG_NOSUB flag was used). +If +.I regcomp +fails, it returns a non-zero error code; +see DIAGNOSTICS. +.PP +.I Regexec +matches the compiled RE pointed to by +.I preg +against the +.IR string , +subject to the flags in +.IR eflags , +and reports results using +.IR nmatch , +.IR pmatch , +and the returned value. +The RE must have been compiled by a previous invocation of +.IR regcomp . +The compiled form is not altered during execution of +.IR regexec , +so a single compiled RE can be used simultaneously by multiple threads. +.PP +By default, +the NUL-terminated string pointed to by +.I string +is considered to be the text of an entire line, minus any terminating +newline. +The +.I eflags +argument is the bitwise OR of zero or more of the following flags: +.IP REG_NOTBOL \w'REG_STARTEND'u+2n +The first character of +the string +is not the beginning of a line, so the `^' anchor should not match before it. +This does not affect the behavior of newlines under REG_NEWLINE. +.IP REG_NOTEOL +The NUL terminating +the string +does not end a line, so the `$' anchor should not match before it. +This does not affect the behavior of newlines under REG_NEWLINE. +.IP REG_STARTEND +The string is considered to start at +\fIstring\fR\ + \fIpmatch\fR[0].\fIrm_so\fR +and to have a terminating NUL located at +\fIstring\fR\ + \fIpmatch\fR[0].\fIrm_eo\fR +(there need not actually be a NUL at that location), +regardless of the value of +.IR nmatch . +See below for the definition of +.IR pmatch +and +.IR nmatch . +This is an extension, +compatible with but not specified by POSIX 1003.2, +and should be used with +caution in software intended to be portable to other systems. +Note that a non-zero \fIrm_so\fR does not imply REG_NOTBOL; +REG_STARTEND affects only the location of the string, +not how it is matched. +.PP +See +.ZR +for a discussion of what is matched in situations where an RE or a +portion thereof could match any of several substrings of +.IR string . +.PP +Normally, +.I regexec +returns 0 for success and the non-zero code REG_NOMATCH for failure. +Other non-zero error codes may be returned in exceptional situations; +see DIAGNOSTICS. +.PP +If REG_NOSUB was specified in the compilation of the RE, +or if +.I nmatch +is 0, +.I regexec +ignores the +.I pmatch +argument (but see below for the case where REG_STARTEND is specified). +Otherwise, +.I pmatch +points to an array of +.I nmatch +structures of type +.IR regmatch_t . +Such a structure has at least the members +.I rm_so +and +.IR rm_eo , +both of type +.I regoff_t +(a signed arithmetic type at least as large as an +.I off_t +and a +.IR ssize_t ), +containing respectively the offset of the first character of a substring +and the offset of the first character after the end of the substring. +Offsets are measured from the beginning of the +.I string +argument given to +.IR regexec . +An empty substring is denoted by equal offsets, +both indicating the character following the empty substring. +.PP +The 0th member of the +.I pmatch +array is filled in to indicate what substring of +.I string +was matched by the entire RE. +Remaining members report what substring was matched by parenthesized +subexpressions within the RE; +member +.I i +reports subexpression +.IR i , +with subexpressions counted (starting at 1) by the order of their opening +parentheses in the RE, left to right. +Unused entries in the array\(emcorresponding either to subexpressions that +did not participate in the match at all, or to subexpressions that do not +exist in the RE (that is, \fIi\fR\ > \fIpreg\fR\->\fIre_nsub\fR)\(emhave both +.I rm_so +and +.I rm_eo +set to \-1. +If a subexpression participated in the match several times, +the reported substring is the last one it matched. +(Note, as an example in particular, that when the RE `(b*)+' matches `bbb', +the parenthesized subexpression matches each of the three `b's and then +an infinite number of empty strings following the last `b', +so the reported substring is one of the empties.) +.PP +If REG_STARTEND is specified, +.I pmatch +must point to at least one +.I regmatch_t +(even if +.I nmatch +is 0 or REG_NOSUB was specified), +to hold the input offsets for REG_STARTEND. +Use for output is still entirely controlled by +.IR nmatch ; +if +.I nmatch +is 0 or REG_NOSUB was specified, +the value of +.IR pmatch [0] +will not be changed by a successful +.IR regexec . +.PP +.I Regerror +maps a non-zero +.I errcode +from either +.I regcomp +or +.I regexec +to a human-readable, printable message. +If +.I preg +is non-NULL, +the error code should have arisen from use of +the +.I regex_t +pointed to by +.IR preg , +and if the error code came from +.IR regcomp , +it should have been the result from the most recent +.I regcomp +using that +.IR regex_t . +.RI ( Regerror +may be able to supply a more detailed message using information +from the +.IR regex_t .) +.I Regerror +places the NUL-terminated message into the buffer pointed to by +.IR errbuf , +limiting the length (including the NUL) to at most +.I errbuf_size +bytes. +If the whole message won't fit, +as much of it as will fit before the terminating NUL is supplied. +In any case, +the returned value is the size of buffer needed to hold the whole +message (including terminating NUL). +If +.I errbuf_size +is 0, +.I errbuf +is ignored but the return value is still correct. +.PP +If the +.I errcode +given to +.I regerror +is first ORed with REG_ITOA, +the ``message'' that results is the printable name of the error code, +e.g. ``REG_NOMATCH'', +rather than an explanation thereof. +If +.I errcode +is REG_ATOI, +then +.I preg +shall be non-NULL and the +.I re_endp +member of the structure it points to +must point to the printable name of an error code; +in this case, the result in +.I errbuf +is the decimal digits of +the numeric value of the error code +(0 if the name is not recognized). +REG_ITOA and REG_ATOI are intended primarily as debugging facilities; +they are extensions, +compatible with but not specified by POSIX 1003.2, +and should be used with +caution in software intended to be portable to other systems. +Be warned also that they are considered experimental and changes are possible. +.PP +.I Regfree +frees any dynamically-allocated storage associated with the compiled RE +pointed to by +.IR preg . +The remaining +.I regex_t +is no longer a valid compiled RE +and the effect of supplying it to +.I regexec +or +.I regerror +is undefined. +.PP +None of these functions references global variables except for tables +of constants; +all are safe for use from multiple threads if the arguments are safe. +.SH IMPLEMENTATION CHOICES +There are a number of decisions that 1003.2 leaves up to the implementor, +either by explicitly saying ``undefined'' or by virtue of them being +forbidden by the RE grammar. +This implementation treats them as follows. +.PP +See +.ZR +for a discussion of the definition of case-independent matching. +.PP +There is no particular limit on the length of REs, +except insofar as memory is limited. +Memory usage is approximately linear in RE size, and largely insensitive +to RE complexity, except for bounded repetitions. +See BUGS for one short RE using them +that will run almost any system out of memory. +.PP +A backslashed character other than one specifically given a magic meaning +by 1003.2 (such magic meanings occur only in obsolete [``basic''] REs) +is taken as an ordinary character. +.PP +Any unmatched [ is a REG_EBRACK error. +.PP +Equivalence classes cannot begin or end bracket-expression ranges. +The endpoint of one range cannot begin another. +.PP +RE_DUP_MAX, the limit on repetition counts in bounded repetitions, is 255. +.PP +A repetition operator (?, *, +, or bounds) cannot follow another +repetition operator. +A repetition operator cannot begin an expression or subexpression +or follow `^' or `|'. +.PP +`|' cannot appear first or last in a (sub)expression or after another `|', +i.e. an operand of `|' cannot be an empty subexpression. +An empty parenthesized subexpression, `()', is legal and matches an +empty (sub)string. +An empty string is not a legal RE. +.PP +A `{' followed by a digit is considered the beginning of bounds for a +bounded repetition, which must then follow the syntax for bounds. +A `{' \fInot\fR followed by a digit is considered an ordinary character. +.PP +`^' and `$' beginning and ending subexpressions in obsolete (``basic'') +REs are anchors, not ordinary characters. +.SH SEE ALSO +grep(1), re_format(7) +.PP +POSIX 1003.2, sections 2.8 (Regular Expression Notation) +and +B.5 (C Binding for Regular Expression Matching). +.SH DIAGNOSTICS +Non-zero error codes from +.I regcomp +and +.I regexec +include the following: +.PP +.nf +.ta \w'REG_ECOLLATE'u+3n +REG_NOMATCH regexec() failed to match +REG_BADPAT invalid regular expression +REG_ECOLLATE invalid collating element +REG_ECTYPE invalid character class +REG_EESCAPE \e applied to unescapable character +REG_ESUBREG invalid backreference number +REG_EBRACK brackets [ ] not balanced +REG_EPAREN parentheses ( ) not balanced +REG_EBRACE braces { } not balanced +REG_BADBR invalid repetition count(s) in { } +REG_ERANGE invalid character range in [ ] +REG_ESPACE ran out of memory +REG_BADRPT ?, *, or + operand invalid +REG_EMPTY empty (sub)expression +REG_ASSERT ``can't happen''\(emyou found a bug +REG_INVARG invalid argument, e.g. negative-length string +.fi +.SH HISTORY +Originally written by Henry Spencer at University of Toronto. +Altered for inclusion in the 4.4BSD distribution. +.SH BUGS +This is an alpha release with known defects. +Please report problems. +.PP +There is one known functionality bug. +The implementation of internationalization is incomplete: +the locale is always assumed to be the default one of 1003.2, +and only the collating elements etc. of that locale are available. +.PP +The back-reference code is subtle and doubts linger about its correctness +in complex cases. +.PP +.I Regexec +performance is poor. +This will improve with later releases. +.I Nmatch +exceeding 0 is expensive; +.I nmatch +exceeding 1 is worse. +.I Regexec +is largely insensitive to RE complexity \fIexcept\fR that back +references are massively expensive. +RE length does matter; in particular, there is a strong speed bonus +for keeping RE length under about 30 characters, +with most special characters counting roughly double. +.PP +.I Regcomp +implements bounded repetitions by macro expansion, +which is costly in time and space if counts are large +or bounded repetitions are nested. +An RE like, say, +`((((a{1,100}){1,100}){1,100}){1,100}){1,100}' +will (eventually) run almost any existing machine out of swap space. +.PP +There are suspected problems with response to obscure error conditions. +Notably, +certain kinds of internal overflow, +produced only by truly enormous REs or by multiply nested bounded repetitions, +are probably not handled well. +.PP +Due to a mistake in 1003.2, things like `a)b' are legal REs because `)' is +a special character only in the presence of a previous unmatched `('. +This can't be fixed until the spec is fixed. +.PP +The standard's definition of back references is vague. +For example, does +`a\e(\e(b\e)*\e2\e)*d' match `abbbd'? +Until the standard is clarified, +behavior in such cases should not be relied on. +.PP +The implementation of word-boundary matching is a bit of a kludge, +and bugs may lurk in combinations of word-boundary matching and anchoring. diff --git a/contrib/nvi/regex/regex.h b/contrib/nvi/regex/regex.h new file mode 100644 index 0000000..cabd66b --- /dev/null +++ b/contrib/nvi/regex/regex.h @@ -0,0 +1,109 @@ +/* $NetBSD: regex.h,v 1.1.1.2 2008/05/18 14:31:38 aymeric Exp $ */ + +/*- + * Copyright (c) 1992 Henry Spencer. + * Copyright (c) 1992, 1993 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Henry Spencer of the University of Toronto. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * @(#)regex.h 8.1 (Berkeley) 6/2/93 + */ + +#ifndef _REGEX_H_ +#define _REGEX_H_ + +#ifdef __REGEX_PRIVATE +#include "config.h" +#include "../common/multibyte.h" +#endif + +/* types */ +typedef off_t regoff_t; + +typedef struct { + int re_magic; + size_t re_nsub; /* number of parenthesized subexpressions */ + const RCHAR_T *re_endp; /* end pointer for REG_PEND */ + struct re_guts *re_g; /* none of your business :-) */ +} regex_t; + +typedef struct { + regoff_t rm_so; /* start of match */ + regoff_t rm_eo; /* end of match */ +} regmatch_t; + +/* regcomp() flags */ +#define REG_BASIC 0000 +#define REG_EXTENDED 0001 +#define REG_ICASE 0002 +#define REG_NOSUB 0004 +#define REG_NEWLINE 0010 +#define REG_NOSPEC 0020 +#define REG_PEND 0040 +#define REG_DUMP 0200 + +/* regerror() flags */ +#define REG_NOMATCH 1 +#define REG_BADPAT 2 +#define REG_ECOLLATE 3 +#define REG_ECTYPE 4 +#define REG_EESCAPE 5 +#define REG_ESUBREG 6 +#define REG_EBRACK 7 +#define REG_EPAREN 8 +#define REG_EBRACE 9 +#define REG_BADBR 10 +#define REG_ERANGE 11 +#define REG_ESPACE 12 +#define REG_BADRPT 13 +#define REG_EMPTY 14 +#define REG_ASSERT 15 +#define REG_INVARG 16 +#define REG_ATOI 255 /* convert name to number (!) */ +#define REG_ITOA 0400 /* convert number to name (!) */ + +/* regexec() flags */ +#define REG_NOTBOL 00001 +#define REG_NOTEOL 00002 +#define REG_STARTEND 00004 +#define REG_TRACE 00400 /* tracing of execution */ +#define REG_LARGE 01000 /* force large representation */ +#define REG_BACKR 02000 /* force use of backref code */ + +int regcomp __P((regex_t *, const RCHAR_T *, int)); +size_t regerror __P((int, const regex_t *, char *, size_t)); +int regexec __P((const regex_t *, + const RCHAR_T *, size_t, regmatch_t [], int)); +void regfree __P((regex_t *)); + +#endif /* !_REGEX_H_ */ diff --git a/contrib/nvi/regex/regex2.h b/contrib/nvi/regex/regex2.h new file mode 100644 index 0000000..7c93528 --- /dev/null +++ b/contrib/nvi/regex/regex2.h @@ -0,0 +1,174 @@ +/* $NetBSD: regex2.h,v 1.5 2011/11/23 15:43:39 tnozaki Exp $ */ + +/*- + * Copyright (c) 1992, 1993, 1994 Henry Spencer. + * Copyright (c) 1992, 1993, 1994 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Henry Spencer of the University of Toronto. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * @(#)regex2.h 8.3 (Berkeley) 3/16/94 + */ + +/* + * First, the stuff that ends up in the outside-world include file + = typedef off_t regoff_t; + = typedef struct { + = int re_magic; + = size_t re_nsub; // number of parenthesized subexpressions + = const char *re_endp; // end pointer for REG_PEND + = struct re_guts *re_g; // none of your business :-) + = } regex_t; + = typedef struct { + = regoff_t rm_so; // start of match + = regoff_t rm_eo; // end of match + = } regmatch_t; + */ +/* + * internals of regex_t + */ +#define MAGIC1 ((('r'^0200)<<8) | 'e') + +/* + * The internal representation is a *strip*, a sequence of + * operators ending with an endmarker. (Some terminology etc. is a + * historical relic of earlier versions which used multiple strips.) + * Certain oddities in the representation are there to permit running + * the machinery backwards; in particular, any deviation from sequential + * flow must be marked at both its source and its destination. Some + * fine points: + * + * - OPLUS_ and O_PLUS are *inside* the loop they create. + * - OQUEST_ and O_QUEST are *outside* the bypass they create. + * - OCH_ and O_CH are *outside* the multi-way branch they create, while + * OOR1 and OOR2 are respectively the end and the beginning of one of + * the branches. Note that there is an implicit OOR2 following OCH_ + * and an implicit OOR1 preceding O_CH. + * + * In state representations, an operator's bit is on to signify a state + * immediately *preceding* "execution" of that operator. + */ +typedef char sop; /* strip operator */ +typedef size_t sopno; +/* operators meaning operand */ +/* (back, fwd are offsets) */ +#define OEND (1) /* endmarker - */ +#define OCHAR (2) /* character unsigned char */ +#define OBOL (3) /* left anchor - */ +#define OEOL (4) /* right anchor - */ +#define OANY (5) /* . - */ +#define OANYOF (6) /* [...] set number */ +#define OBACK_ (7) /* begin \d paren number */ +#define O_BACK (8) /* end \d paren number */ +#define OPLUS_ (9) /* + prefix fwd to suffix */ +#define O_PLUS (10) /* + suffix back to prefix */ +#define OQUEST_ (11) /* ? prefix fwd to suffix */ +#define O_QUEST (12) /* ? suffix back to prefix */ +#define OLPAREN (13) /* ( fwd to ) */ +#define ORPAREN (14) /* ) back to ( */ +#define OCH_ (15) /* begin choice fwd to OOR2 */ +#define OOR1 (16) /* | pt. 1 back to OOR1 or OCH_ */ +#define OOR2 (17) /* | pt. 2 fwd to OOR2 or O_CH */ +#define O_CH (18) /* end choice back to OOR1 */ +#define OBOW (19) /* begin word - */ +#define OEOW (20) /* end word - */ + +/* + * Structure for [] character-set representation. Character sets are + * done as bit vectors, grouped 8 to a byte vector for compactness. + * The individual set therefore has both a pointer to the byte vector + * and a mask to pick out the relevant bit of each byte. A hash code + * simplifies testing whether two sets could be identical. + * + * This will get trickier for multicharacter collating elements. As + * preliminary hooks for dealing with such things, we also carry along + * a string of multi-character elements, and decide the size of the + * vectors at run time. + */ +typedef struct { + uch *ptr; /* -> uch [csetsize] */ + uch mask; /* bit within array */ + uch hash; /* hash code */ + size_t smultis; + char *multis; /* -> char[smulti] ab\0cd\0ef\0\0 */ +} cset; +/* note that CHadd and CHsub are unsafe, and CHIN doesn't yield 0/1 */ +#define CHadd(cs, c) ((cs)->ptr[(uch)(c)] |= (cs)->mask, (cs)->hash += (c)) +#define CHsub(cs, c) ((cs)->ptr[(uch)(c)] &= ~(cs)->mask, (cs)->hash -= (c)) +#define CHIN(cs, c) ((cs)->ptr[(uch)(c)] & (cs)->mask) +#define MCadd(p, cs, cp) mcadd(p, cs, cp) /* regcomp() internal fns */ +#define MCsub(p, cs, cp) mcsub(p, cs, cp) +#define MCin(p, cs, cp) mcin(p, cs, cp) + +/* stuff for character categories */ +typedef RCHAR_T cat_t; + +/* + * main compiled-expression structure + */ +struct re_guts { + int magic; +# define MAGIC2 ((('R'^0200)<<8)|'E') + sop *strip; /* malloced area for strip */ + RCHAR_T *stripdata; /* malloced area for stripdata */ + size_t csetsize; /* number of bits in a cset vector */ + size_t ncsets; /* number of csets in use */ + cset *sets; /* -> cset [ncsets] */ + uch *setbits; /* -> uch[csetsize][ncsets/CHAR_BIT] */ + int cflags; /* copy of regcomp() cflags argument */ + sopno nstates; /* = number of sops */ + sopno firststate; /* the initial OEND (normally 0) */ + sopno laststate; /* the final OEND */ + int iflags; /* internal flags */ +# define USEBOL 01 /* used ^ */ +# define USEEOL 02 /* used $ */ +# define BAD 04 /* something wrong */ + size_t nbol; /* number of ^ used */ + size_t neol; /* number of $ used */ +#if 0 + size_t ncategories; /* how many character categories */ + cat_t *categories; /* ->catspace[-CHAR_MIN] */ +#endif + RCHAR_T *must; /* match must contain this string */ + size_t mlen; /* length of must */ + size_t nsub; /* copy of re_nsub */ + int backrefs; /* does it use back references? */ + sopno nplus; /* how deep does it nest +s? */ + /* catspace must be last */ +#if 0 + cat_t catspace[1]; /* actually [NC] */ +#endif +}; + +/* misc utilities */ +#define OUT REOF /* a non-character value */ +#define ISWORD(c) ((c) == '_' || (ISGRAPH((UCHAR_T)c) && !ISPUNCT((UCHAR_T)c))) diff --git a/contrib/nvi/regex/regexec.c b/contrib/nvi/regex/regexec.c new file mode 100644 index 0000000..89ab2ca --- /dev/null +++ b/contrib/nvi/regex/regexec.c @@ -0,0 +1,180 @@ +/* $NetBSD: regexec.c,v 1.4 2009/10/31 20:11:53 dsl Exp $ */ + +/*- + * Copyright (c) 1992, 1993, 1994 Henry Spencer. + * Copyright (c) 1992, 1993, 1994 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Henry Spencer of the University of Toronto. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * @(#)regexec.c 8.2 (Berkeley) 3/16/94 + */ + +#if defined(LIBC_SCCS) && !defined(lint) +static char sccsid[] = "@(#)regexec.c 8.2 (Berkeley) 3/16/94"; +#endif /* LIBC_SCCS and not lint */ + +/* + * the outer shell of regexec() + * + * This file includes engine.c *twice*, after muchos fiddling with the + * macros that code uses. This lets the same code operate on two different + * representations for state sets. + */ +#include <sys/types.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <limits.h> +#include <ctype.h> +#include <regex.h> + +#include "utils.h" +#include "regex2.h" + +#ifdef notdef +static int nope = 0; /* for use in asserts; shuts lint up */ +#endif + +/* macros for manipulating states, small version */ +#define states int +#define states1 int /* for later use in regexec() decision */ +#define CLEAR(v) ((v) = 0) +#define SET0(v, n) ((v) &= ~(1 << (n))) +#define SET1(v, n) ((v) |= 1 << (n)) +#define ISSET(v, n) ((v) & (1 << (n))) +#define ASSIGN(d, s) ((d) = (s)) +#define EQ(a, b) ((a) == (b)) +#define STATEVARS int dummy /* dummy version */ +#define STATESETUP(m, n) /* nothing */ +#define STATETEARDOWN(m) /* nothing */ +#define SETUP(v) ((v) = 0) +#define onestate int +#define INIT(o, n) ((o) = (unsigned)1 << (n)) +#define INC(o) ((o) <<= 1) +#define ISSTATEIN(v, o) ((v) & (o)) +/* some abbreviations; note that some of these know variable names! */ +/* do "if I'm here, I can also be there" etc without branches */ +#define FWD(dst, src, n) ((dst) |= ((unsigned)(src)&(here)) << (n)) +#define BACK(dst, src, n) ((dst) |= ((unsigned)(src)&(here)) >> (n)) +#define ISSETBACK(v, n) ((v) & ((unsigned)here >> (n))) +/* function names */ +#define SNAMES /* engine.c looks after details */ + +#include "engine.c" + +/* now undo things */ +#undef states +#undef CLEAR +#undef SET0 +#undef SET1 +#undef ISSET +#undef ASSIGN +#undef EQ +#undef STATEVARS +#undef STATESETUP +#undef STATETEARDOWN +#undef SETUP +#undef onestate +#undef INIT +#undef INC +#undef ISSTATEIN +#undef FWD +#undef BACK +#undef ISSETBACK +#undef SNAMES + +/* macros for manipulating states, large version */ +#define states char * +#define CLEAR(v) memset(v, 0, m->g->nstates) +#define SET0(v, n) ((v)[n] = 0) +#define SET1(v, n) ((v)[n] = 1) +#define ISSET(v, n) ((v)[n]) +#define ASSIGN(d, s) memcpy(d, s, m->g->nstates) +#define EQ(a, b) (memcmp(a, b, m->g->nstates) == 0) +#define STATEVARS int vn; char *space +#define STATESETUP(m, nv) { (m)->space = malloc((nv)*(m)->g->nstates); \ + if ((m)->space == NULL) return(REG_ESPACE); \ + (m)->vn = 0; } +#define STATETEARDOWN(m) { free((m)->space); } +#define SETUP(v) ((v) = &m->space[m->vn++ * m->g->nstates]) +#define onestate int +#define INIT(o, n) ((o) = (n)) +#define INC(o) ((o)++) +#define ISSTATEIN(v, o) ((v)[o]) +/* some abbreviations; note that some of these know variable names! */ +/* do "if I'm here, I can also be there" etc without branches */ +#define FWD(dst, src, n) ((dst)[here+(n)] |= (src)[here]) +#define BACK(dst, src, n) ((dst)[here-(n)] |= (src)[here]) +#define ISSETBACK(v, n) ((v)[here - (n)]) +/* function names */ +#define LNAMES /* flag */ + +#include "engine.c" + +/* + - regexec - interface for matching + = extern int regexec(const regex_t *, const char *, size_t, \ + = regmatch_t [], int); + = #define REG_NOTBOL 00001 + = #define REG_NOTEOL 00002 + = #define REG_STARTEND 00004 + = #define REG_TRACE 00400 // tracing of execution + = #define REG_LARGE 01000 // force large representation + = #define REG_BACKR 02000 // force use of backref code + * + * We put this here so we can exploit knowledge of the state representation + * when choosing which matcher to call. Also, by this point the matchers + * have been prototyped. + */ +int /* 0 success, REG_NOMATCH failure */ +regexec(const regex_t *preg, const RCHAR_T *string, size_t nmatch, regmatch_t *pmatch, int eflags) +{ + register struct re_guts *g = preg->re_g; +#ifdef REDEBUG +# define GOODFLAGS(f) (f) +#else +# define GOODFLAGS(f) ((f)&(REG_NOTBOL|REG_NOTEOL|REG_STARTEND)) +#endif + + if (preg->re_magic != MAGIC1 || g->magic != MAGIC2) + return(REG_BADPAT); + assert(!(g->iflags&BAD)); + if (g->iflags&BAD) /* backstop for no-debug case */ + return(REG_BADPAT); + eflags = GOODFLAGS(eflags); + + if (g->nstates <= (int)(CHAR_BIT*sizeof(states1)) && !(eflags®_LARGE)) + return(smatcher(g, string, nmatch, pmatch, eflags)); + else + return(lmatcher(g, string, nmatch, pmatch, eflags)); +} diff --git a/contrib/nvi/regex/regfree.c b/contrib/nvi/regex/regfree.c new file mode 100644 index 0000000..61df17c --- /dev/null +++ b/contrib/nvi/regex/regfree.c @@ -0,0 +1,83 @@ +/* $NetBSD: regfree.c,v 1.2 2009/01/02 00:32:11 tnozaki Exp $ */ + +/*- + * Copyright (c) 1992, 1993, 1994 Henry Spencer. + * Copyright (c) 1992, 1993, 1994 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Henry Spencer of the University of Toronto. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * @(#)regfree.c 8.2 (Berkeley) 3/16/94 + */ + +#if defined(LIBC_SCCS) && !defined(lint) +static char sccsid[] = "@(#)regfree.c 8.2 (Berkeley) 3/16/94"; +#endif /* LIBC_SCCS and not lint */ + +#include <sys/types.h> +#include <stdio.h> +#include <stdlib.h> +#include <regex.h> + +#include "utils.h" +#include "regex2.h" + +/* + - regfree - free everything + = extern void regfree(regex_t *); + */ +void +regfree(regex_t *preg) +{ + register struct re_guts *g; + + if (preg->re_magic != MAGIC1) /* oops */ + return; /* nice to complain, but hard */ + + g = preg->re_g; + if (g == NULL || g->magic != MAGIC2) /* oops again */ + return; + preg->re_magic = 0; /* mark it invalid */ + g->magic = 0; /* mark it invalid */ + + if (g->strip != NULL) + free((char *)g->strip); + if (g->stripdata != NULL) + free((char *)g->stripdata); + if (g->sets != NULL) + free((char *)g->sets); + if (g->setbits != NULL) + free((char *)g->setbits); + if (g->must != NULL) + free(g->must); + free((char *)g); +} diff --git a/contrib/nvi/regex/utils.h b/contrib/nvi/regex/utils.h new file mode 100644 index 0000000..4a6f57a --- /dev/null +++ b/contrib/nvi/regex/utils.h @@ -0,0 +1,59 @@ +/* $NetBSD: utils.h,v 1.1.1.2 2008/05/18 14:31:39 aymeric Exp $ */ + +/*- + * Copyright (c) 1992, 1993, 1994 Henry Spencer. + * Copyright (c) 1992, 1993, 1994 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Henry Spencer of the University of Toronto. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * @(#)utils.h 8.2 (Berkeley) 3/16/94 + */ + +/* utility definitions */ +#define DUPMAX _POSIX2_RE_DUP_MAX /* xxx is this right? */ +#define INFINITY (DUPMAX + 1) +#define NC (CHAR_MAX - CHAR_MIN + 1) +typedef unsigned char uch; + +/* switch off assertions (if not already off) if no REDEBUG */ +#ifndef REDEBUG +#ifndef NDEBUG +#define NDEBUG /* no assertions please */ +#endif +#endif +#include <assert.h> + +/* for old systems with bcopy() but no memmove() */ +#ifdef USEBCOPY +#define memmove(d, s, c) bcopy(s, d, c) +#endif |