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Diffstat (limited to 'usr.bin/sed/compile.c')
-rw-r--r-- | usr.bin/sed/compile.c | 771 |
1 files changed, 0 insertions, 771 deletions
diff --git a/usr.bin/sed/compile.c b/usr.bin/sed/compile.c deleted file mode 100644 index 944a226..0000000 --- a/usr.bin/sed/compile.c +++ /dev/null @@ -1,771 +0,0 @@ -/*- - * Copyright (c) 1992 Diomidis Spinellis. - * Copyright (c) 1992, 1993 - * The Regents of the University of California. All rights reserved. - * - * This code is derived from software contributed to Berkeley by - * Diomidis Spinellis of Imperial College, University of London. - * - * 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. - */ - -#ifndef lint -static char sccsid[] = "@(#)compile.c 8.1 (Berkeley) 6/6/93"; -#endif /* not lint */ - -#include <sys/types.h> -#include <sys/stat.h> - -#include <ctype.h> -#include <errno.h> -#include <fcntl.h> -#include <limits.h> -#include <regex.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.h> - -#include "defs.h" -#include "extern.h" - -#define LHSZ 128 -#define LHMASK (LHSZ - 1) -static struct labhash { - struct labhash *lh_next; - u_int lh_hash; - struct s_command *lh_cmd; - int lh_ref; -} *labels[LHSZ]; - -static char *compile_addr __P((char *, struct s_addr *)); -static char *compile_delimited __P((char *, char *)); -static char *compile_flags __P((char *, struct s_subst *)); -static char *compile_re __P((char *, regex_t **)); -static char *compile_subst __P((char *, struct s_subst *)); -static char *compile_text __P((void)); -static char *compile_tr __P((char *, char **)); -static struct s_command - **compile_stream __P((char *, struct s_command **, char *)); -static char *duptoeol __P((char *, char *)); -static void enterlabel __P((struct s_command *)); -static struct s_command - *findlabel __P((char *)); -static void fixuplabel __P((struct s_command *, struct s_command *)); -static void uselabel __P((void)); - -/* - * Command specification. This is used to drive the command parser. - */ -struct s_format { - char code; /* Command code */ - int naddr; /* Number of address args */ - enum e_args args; /* Argument type */ -}; - -static struct s_format cmd_fmts[] = { - {'{', 2, GROUP}, - {'a', 1, TEXT}, - {'b', 2, BRANCH}, - {'c', 2, TEXT}, - {'d', 2, EMPTY}, - {'D', 2, EMPTY}, - {'g', 2, EMPTY}, - {'G', 2, EMPTY}, - {'h', 2, EMPTY}, - {'H', 2, EMPTY}, - {'i', 1, TEXT}, - {'l', 2, EMPTY}, - {'n', 2, EMPTY}, - {'N', 2, EMPTY}, - {'p', 2, EMPTY}, - {'P', 2, EMPTY}, - {'q', 1, EMPTY}, - {'r', 1, RFILE}, - {'s', 2, SUBST}, - {'t', 2, BRANCH}, - {'w', 2, WFILE}, - {'x', 2, EMPTY}, - {'y', 2, TR}, - {'!', 2, NONSEL}, - {':', 0, LABEL}, - {'#', 0, COMMENT}, - {'=', 1, EMPTY}, - {'\0', 0, COMMENT}, -}; - -/* The compiled program. */ -struct s_command *prog; - -/* - * Compile the program into prog. - * Initialise appends. - */ -void -compile() -{ - *compile_stream(NULL, &prog, NULL) = NULL; - fixuplabel(prog, NULL); - uselabel(); - appends = xmalloc(sizeof(struct s_appends) * appendnum); - match = xmalloc((maxnsub + 1) * sizeof(regmatch_t)); -} - -#define EATSPACE() do { \ - if (p) \ - while (*p && isascii(*p) && isspace(*p)) \ - p++; \ - } while (0) - -static struct s_command ** -compile_stream(terminator, link, p) - char *terminator; - struct s_command **link; - register char *p; -{ - static char lbuf[_POSIX2_LINE_MAX + 1]; /* To save stack */ - struct s_command *cmd, *cmd2; - struct s_format *fp; - int naddr; /* Number of addresses */ - - if (p != NULL) - goto semicolon; - for (;;) { - if ((p = cu_fgets(lbuf, sizeof(lbuf))) == NULL) { - if (terminator != NULL) - err(COMPILE, "unexpected EOF (pending }'s)"); - return (link); - } - -semicolon: EATSPACE(); - if (p && (*p == '#' || *p == '\0')) - continue; - if (*p == '}') { - if (terminator == NULL) - err(COMPILE, "unexpected }"); - return (link); - } - *link = cmd = xmalloc(sizeof(struct s_command)); - link = &cmd->next; - cmd->nonsel = cmd->inrange = 0; - /* First parse the addresses */ - naddr = 0; - cmd->a1 = cmd->a2 = NULL; - -/* Valid characters to start an address */ -#define addrchar(c) (strchr("0123456789/\\$", (c))) - if (addrchar(*p)) { - naddr++; - cmd->a1 = xmalloc(sizeof(struct s_addr)); - p = compile_addr(p, cmd->a1); - EATSPACE(); /* EXTENSION */ - if (*p == ',') { - naddr++; - p++; - EATSPACE(); /* EXTENSION */ - cmd->a2 = xmalloc(sizeof(struct s_addr)); - p = compile_addr(p, cmd->a2); - } - } - -nonsel: /* Now parse the command */ - EATSPACE(); - if (!*p) - err(COMPILE, "command expected"); - cmd->code = *p; - for (fp = cmd_fmts; fp->code; fp++) - if (fp->code == *p) - break; - if (!fp->code) - err(COMPILE, "invalid command code %c", *p); - if (naddr > fp->naddr) - err(COMPILE, -"command %c expects up to %d address(es), found %d", *p, fp->naddr, naddr); - switch (fp->args) { - case NONSEL: /* ! */ - cmd->nonsel = ! cmd->nonsel; - p++; - goto nonsel; - case GROUP: /* { */ - p++; - EATSPACE(); - if (!*p) - p = NULL; - cmd2 = xmalloc(sizeof(struct s_command)); - cmd2->code = '}'; - *compile_stream("}", &cmd->u.c, p) = cmd2; - cmd->next = cmd2; - link = &cmd2->next; - break; - case EMPTY: /* d D g G h H l n N p P q x = \0 */ - p++; - EATSPACE(); - if (*p == ';') { - p++; - link = &cmd->next; - goto semicolon; - } - if (*p) - err(COMPILE, -"extra characters at the end of %c command", cmd->code); - break; - case TEXT: /* a c i */ - p++; - EATSPACE(); - if (*p != '\\') - err(COMPILE, -"command %c expects \\ followed by text", cmd->code); - p++; - EATSPACE(); - if (*p) - err(COMPILE, -"extra characters after \\ at the end of %c command", cmd->code); - cmd->t = compile_text(); - break; - case COMMENT: /* \0 # */ - break; - case WFILE: /* w */ - p++; - EATSPACE(); - if (*p == '\0') - err(COMPILE, "filename expected"); - cmd->t = duptoeol(p, "w command"); - if (aflag) - cmd->u.fd = -1; - else if ((cmd->u.fd = open(p, - O_WRONLY|O_APPEND|O_CREAT|O_TRUNC, - DEFFILEMODE)) == -1) - err(FATAL, "%s: %s\n", p, strerror(errno)); - break; - case RFILE: /* r */ - p++; - EATSPACE(); - if (*p == '\0') - err(COMPILE, "filename expected"); - else - cmd->t = duptoeol(p, "read command"); - break; - case BRANCH: /* b t */ - p++; - EATSPACE(); - if (*p == '\0') - cmd->t = NULL; - else - cmd->t = duptoeol(p, "branch"); - break; - case LABEL: /* : */ - p++; - EATSPACE(); - cmd->t = duptoeol(p, "label"); - if (strlen(p) == 0) - err(COMPILE, "empty label"); - enterlabel(cmd); - break; - case SUBST: /* s */ - p++; - if (*p == '\0' || *p == '\\') - err(COMPILE, -"substitute pattern can not be delimited by newline or backslash"); - cmd->u.s = xmalloc(sizeof(struct s_subst)); - p = compile_re(p, &cmd->u.s->re); - if (p == NULL) - err(COMPILE, "unterminated substitute pattern"); - --p; - p = compile_subst(p, cmd->u.s); - p = compile_flags(p, cmd->u.s); - EATSPACE(); - if (*p == ';') { - p++; - link = &cmd->next; - goto semicolon; - } - break; - case TR: /* y */ - p++; - p = compile_tr(p, (char **)&cmd->u.y); - EATSPACE(); - if (*p == ';') { - p++; - link = &cmd->next; - goto semicolon; - } - if (*p) - err(COMPILE, -"extra text at the end of a transform command"); - break; - } - } -} - -/* - * Get a delimited string. P points to the delimeter of the string; d points - * to a buffer area. Newline and delimiter escapes are processed; other - * escapes are ignored. - * - * Returns a pointer to the first character after the final delimiter or NULL - * in the case of a non-terminated string. The character array d is filled - * with the processed string. - */ -static char * -compile_delimited(p, d) - char *p, *d; -{ - char c; - - c = *p++; - if (c == '\0') - return (NULL); - else if (c == '\\') - err(COMPILE, "\\ can not be used as a string delimiter"); - else if (c == '\n') - err(COMPILE, "newline can not be used as a string delimiter"); - while (*p) { - if (*p == '\\' && p[1] == c) - p++; - else if (*p == '\\' && p[1] == 'n') { - *d++ = '\n'; - p += 2; - continue; - } else if (*p == '\\' && p[1] == '\\') - *d++ = *p++; - else if (*p == c) { - *d = '\0'; - return (p + 1); - } - *d++ = *p++; - } - return (NULL); -} - -/* - * Get a regular expression. P points to the delimiter of the regular - * expression; repp points to the address of a regexp pointer. Newline - * and delimiter escapes are processed; other escapes are ignored. - * Returns a pointer to the first character after the final delimiter - * or NULL in the case of a non terminated regular expression. The regexp - * pointer is set to the compiled regular expression. - * Cflags are passed to regcomp. - */ -static char * -compile_re(p, repp) - char *p; - regex_t **repp; -{ - int eval; - char re[_POSIX2_LINE_MAX + 1]; - - p = compile_delimited(p, re); - if (p && strlen(re) == 0) { - *repp = NULL; - return (p); - } - *repp = xmalloc(sizeof(regex_t)); - if (p && (eval = regcomp(*repp, re, 0)) != 0) - err(COMPILE, "RE error: %s", strregerror(eval, *repp)); - if (maxnsub < (*repp)->re_nsub) - maxnsub = (*repp)->re_nsub; - return (p); -} - -/* - * Compile the substitution string of a regular expression and set res to - * point to a saved copy of it. Nsub is the number of parenthesized regular - * expressions. - */ -static char * -compile_subst(p, s) - char *p; - struct s_subst *s; -{ - static char lbuf[_POSIX2_LINE_MAX + 1]; - int asize, ref, size; - char c, *text, *op, *sp; - - c = *p++; /* Terminator character */ - if (c == '\0') - return (NULL); - - s->maxbref = 0; - s->linenum = linenum; - asize = 2 * _POSIX2_LINE_MAX + 1; - text = xmalloc(asize); - size = 0; - do { - op = sp = text + size; - for (; *p; p++) { - if (*p == '\\') { - p++; - if (strchr("123456789", *p) != NULL) { - *sp++ = '\\'; - ref = *p - '0'; - if (s->re != NULL && - ref > s->re->re_nsub) - err(COMPILE, -"\\%c not defined in the RE", *p); - if (s->maxbref < ref) - s->maxbref = ref; - } else if (*p == '&' || *p == '\\') - *sp++ = '\\'; - } else if (*p == c) { - p++; - *sp++ = '\0'; - size += sp - op; - s->new = xrealloc(text, size); - return (p); - } else if (*p == '\n') { - err(COMPILE, -"unescaped newline inside substitute pattern"); - /* NOTREACHED */ - } - *sp++ = *p; - } - size += sp - op; - if (asize - size < _POSIX2_LINE_MAX + 1) { - asize *= 2; - text = xmalloc(asize); - } - } while (cu_fgets(p = lbuf, sizeof(lbuf))); - err(COMPILE, "unterminated substitute in regular expression"); - /* NOTREACHED */ -} - -/* - * Compile the flags of the s command - */ -static char * -compile_flags(p, s) - char *p; - struct s_subst *s; -{ - int gn; /* True if we have seen g or n */ - char wfile[_POSIX2_LINE_MAX + 1], *q; - - s->n = 1; /* Default */ - s->p = 0; - s->wfile = NULL; - s->wfd = -1; - for (gn = 0;;) { - EATSPACE(); /* EXTENSION */ - switch (*p) { - case 'g': - if (gn) - err(COMPILE, -"more than one number or 'g' in substitute flags"); - gn = 1; - s->n = 0; - break; - case '\0': - case '\n': - case ';': - return (p); - case 'p': - s->p = 1; - break; - case '1': case '2': case '3': - case '4': case '5': case '6': - case '7': case '8': case '9': - if (gn) - err(COMPILE, -"more than one number or 'g' in substitute flags"); - gn = 1; - /* XXX Check for overflow */ - s->n = (int)strtol(p, &p, 10); - break; - case 'w': - p++; -#ifdef HISTORIC_PRACTICE - if (*p != ' ') { - err(WARNING, "space missing before w wfile"); - return (p); - } -#endif - EATSPACE(); - q = wfile; - while (*p) { - if (*p == '\n') - break; - *q++ = *p++; - } - *q = '\0'; - if (q == wfile) - err(COMPILE, "no wfile specified"); - s->wfile = strdup(wfile); - if (!aflag && (s->wfd = open(wfile, - O_WRONLY|O_APPEND|O_CREAT|O_TRUNC, - DEFFILEMODE)) == -1) - err(FATAL, "%s: %s\n", wfile, strerror(errno)); - return (p); - default: - err(COMPILE, - "bad flag in substitute command: '%c'", *p); - break; - } - p++; - } -} - -/* - * Compile a translation set of strings into a lookup table. - */ -static char * -compile_tr(p, transtab) - char *p; - char **transtab; -{ - int i; - char *lt, *op, *np; - char old[_POSIX2_LINE_MAX + 1]; - char new[_POSIX2_LINE_MAX + 1]; - - if (*p == '\0' || *p == '\\') - err(COMPILE, -"transform pattern can not be delimited by newline or backslash"); - p = compile_delimited(p, old); - if (p == NULL) { - err(COMPILE, "unterminated transform source string"); - return (NULL); - } - p = compile_delimited(--p, new); - if (p == NULL) { - err(COMPILE, "unterminated transform target string"); - return (NULL); - } - EATSPACE(); - if (strlen(new) != strlen(old)) { - err(COMPILE, "transform strings are not the same length"); - return (NULL); - } - /* We assume characters are 8 bits */ - lt = xmalloc(UCHAR_MAX); - for (i = 0; i <= UCHAR_MAX; i++) - lt[i] = (char)i; - for (op = old, np = new; *op; op++, np++) - lt[(u_char)*op] = *np; - *transtab = lt; - return (p); -} - -/* - * Compile the text following an a or i command. - */ -static char * -compile_text() -{ - int asize, size; - char *text, *p, *op, *s; - char lbuf[_POSIX2_LINE_MAX + 1]; - - asize = 2 * _POSIX2_LINE_MAX + 1; - text = xmalloc(asize); - size = 0; - while (cu_fgets(lbuf, sizeof(lbuf))) { - op = s = text + size; - p = lbuf; - EATSPACE(); - for (; *p; p++) { - if (*p == '\\') - p++; - *s++ = *p; - } - size += s - op; - if (p[-2] != '\\') { - *s = '\0'; - break; - } - if (asize - size < _POSIX2_LINE_MAX + 1) { - asize *= 2; - text = xmalloc(asize); - } - } - return (xrealloc(text, size + 1)); -} - -/* - * Get an address and return a pointer to the first character after - * it. Fill the structure pointed to according to the address. - */ -static char * -compile_addr(p, a) - char *p; - struct s_addr *a; -{ - char *end; - - switch (*p) { - case '\\': /* Context address */ - ++p; - /* FALLTHROUGH */ - case '/': /* Context address */ - p = compile_re(p, &a->u.r); - if (p == NULL) - err(COMPILE, "unterminated regular expression"); - a->type = AT_RE; - return (p); - - case '$': /* Last line */ - a->type = AT_LAST; - return (p + 1); - /* Line number */ - case '0': case '1': case '2': case '3': case '4': - case '5': case '6': case '7': case '8': case '9': - a->type = AT_LINE; - a->u.l = strtol(p, &end, 10); - return (end); - default: - err(COMPILE, "expected context address"); - return (NULL); - } -} - -/* - * duptoeol -- - * Return a copy of all the characters up to \n or \0. - */ -static char * -duptoeol(s, ctype) - register char *s; - char *ctype; -{ - size_t len; - int ws; - char *start; - - ws = 0; - for (start = s; *s != '\0' && *s != '\n'; ++s) - ws = isspace(*s); - *s = '\0'; - if (ws) - err(WARNING, "whitespace after %s", ctype); - len = s - start + 1; - return (memmove(xmalloc(len), start, len)); -} - -/* - * Convert goto label names to addresses, and count a and r commands, in - * the given subset of the script. Free the memory used by labels in b - * and t commands (but not by :). - * - * TODO: Remove } nodes - */ -static void -fixuplabel(cp, end) - struct s_command *cp, *end; -{ - - for (; cp != end; cp = cp->next) - switch (cp->code) { - case 'a': - case 'r': - appendnum++; - break; - case 'b': - case 't': - /* Resolve branch target. */ - if (cp->t == NULL) { - cp->u.c = NULL; - break; - } - if ((cp->u.c = findlabel(cp->t)) == NULL) - err(COMPILE2, "undefined label '%s'", cp->t); - free(cp->t); - break; - case '{': - /* Do interior commands. */ - fixuplabel(cp->u.c, cp->next); - break; - } -} - -/* - * Associate the given command label for later lookup. - */ -static void -enterlabel(cp) - struct s_command *cp; -{ - register struct labhash **lhp, *lh; - register u_char *p; - register u_int h, c; - - for (h = 0, p = (u_char *)cp->t; (c = *p) != 0; p++) - h = (h << 5) + h + c; - lhp = &labels[h & LHMASK]; - for (lh = *lhp; lh != NULL; lh = lh->lh_next) - if (lh->lh_hash == h && strcmp(cp->t, lh->lh_cmd->t) == 0) - err(COMPILE2, "duplicate label '%s'", cp->t); - lh = xmalloc(sizeof *lh); - lh->lh_next = *lhp; - lh->lh_hash = h; - lh->lh_cmd = cp; - lh->lh_ref = 0; - *lhp = lh; -} - -/* - * Find the label contained in the command l in the command linked - * list cp. L is excluded from the search. Return NULL if not found. - */ -static struct s_command * -findlabel(name) - char *name; -{ - register struct labhash *lh; - register u_char *p; - register u_int h, c; - - for (h = 0, p = (u_char *)name; (c = *p) != 0; p++) - h = (h << 5) + h + c; - for (lh = labels[h & LHMASK]; lh != NULL; lh = lh->lh_next) { - if (lh->lh_hash == h && strcmp(name, lh->lh_cmd->t) == 0) { - lh->lh_ref = 1; - return (lh->lh_cmd); - } - } - return (NULL); -} - -/* - * Warn about any unused labels. As a side effect, release the label hash - * table space. - */ -static void -uselabel() -{ - register struct labhash *lh, *next; - register int i; - - for (i = 0; i < LHSZ; i++) { - for (lh = labels[i]; lh != NULL; lh = next) { - next = lh->lh_next; - if (!lh->lh_ref) - err(WARNING, "unused label '%s'", - lh->lh_cmd->t); - free(lh); - } - } -} |