summaryrefslogtreecommitdiffstats
path: root/lib/libc/regex/regex2.h
blob: 6beea48e3050adad99865eb8be32f991a82d4a61 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
/*-
 * 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.
 *
 * 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	8.4 (Berkeley) 3/20/94
 * $FreeBSD$
 */

/*
 * 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 unsigned long sop;	/* strip operator */
typedef long sopno;
#define	OPRMASK	0xf8000000L
#define	OPDMASK	0x07ffffffL
#define	OPSHIFT	((unsigned)27)
#define	OP(n)	((n)&OPRMASK)
#define	OPND(n)	((n)&OPDMASK)
#define	SOP(op, opnd)	((op)|(opnd))
/* operators			   meaning	operand			*/
/*						(back, fwd are offsets)	*/
#define	OEND	(1L<<OPSHIFT)	/* endmarker	-			*/
#define	OCHAR	(2L<<OPSHIFT)	/* character	wide character		*/
#define	OBOL	(3L<<OPSHIFT)	/* left anchor	-			*/
#define	OEOL	(4L<<OPSHIFT)	/* right anchor	-			*/
#define	OANY	(5L<<OPSHIFT)	/* .		-			*/
#define	OANYOF	(6L<<OPSHIFT)	/* [...]	set number		*/
#define	OBACK_	(7L<<OPSHIFT)	/* begin \d	paren number		*/
#define	O_BACK	(8L<<OPSHIFT)	/* end \d	paren number		*/
#define	OPLUS_	(9L<<OPSHIFT)	/* + prefix	fwd to suffix		*/
#define	O_PLUS	(10L<<OPSHIFT)	/* + suffix	back to prefix		*/
#define	OQUEST_	(11L<<OPSHIFT)	/* ? prefix	fwd to suffix		*/
#define	O_QUEST	(12L<<OPSHIFT)	/* ? suffix	back to prefix		*/
#define	OLPAREN	(13L<<OPSHIFT)	/* (		fwd to )		*/
#define	ORPAREN	(14L<<OPSHIFT)	/* )		back to (		*/
#define	OCH_	(15L<<OPSHIFT)	/* begin choice	fwd to OOR2		*/
#define	OOR1	(16L<<OPSHIFT)	/* | pt. 1	back to OOR1 or OCH_	*/
#define	OOR2	(17L<<OPSHIFT)	/* | pt. 2	fwd to OOR2 or O_CH	*/
#define	O_CH	(18L<<OPSHIFT)	/* end choice	back to OOR1		*/
#define	OBOW	(19L<<OPSHIFT)	/* begin word	-			*/
#define	OEOW	(20L<<OPSHIFT)	/* end word	-			*/

/*
 * Structures for [] character-set representation.
 */
typedef struct {
	wint_t		min;
	wint_t		max;
} crange;
typedef struct {
	unsigned char	bmp[NC / 8];
	wctype_t	*types;
	int		ntypes;
	wint_t		*wides;
	int		nwides;
	crange		*ranges;
	int		nranges;
	int		invert;
	int		icase;
} cset;

static int
CHIN1(cs, ch)
cset *cs;
wint_t ch;
{
	int i;

	assert(ch >= 0);
	if (ch < NC)
		return (((cs->bmp[ch >> 3] & (1 << (ch & 7))) != 0) ^
		    cs->invert);
	for (i = 0; i < cs->nwides; i++)
		if (ch == cs->wides[i])
			return (!cs->invert);
	for (i = 0; i < cs->nranges; i++)
		if (cs->ranges[i].min <= ch && ch <= cs->ranges[i].max)
			return (!cs->invert);
	for (i = 0; i < cs->ntypes; i++)
		if (iswctype(ch, cs->types[i]))
			return (!cs->invert);
	return (cs->invert);
}

static __inline int
CHIN(cs, ch)
cset *cs;
wint_t ch;
{

	assert(ch >= 0);
	if (ch < NC)
		return (((cs->bmp[ch >> 3] & (1 << (ch & 7))) != 0) ^
		    cs->invert);
	else if (cs->icase)
		return (CHIN1(cs, ch) || CHIN1(cs, towlower(ch)) ||
		    CHIN1(cs, towupper(ch)));
	else
		return (CHIN1(cs, ch));
}

/*
 * main compiled-expression structure
 */
struct re_guts {
	int magic;
#		define	MAGIC2	((('R'^0200)<<8)|'E')
	sop *strip;		/* malloced area for strip */
	int ncsets;		/* number of csets in use */
	cset *sets;		/* -> cset [ncsets] */
	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 */
	int nbol;		/* number of ^ used */
	int neol;		/* number of $ used */
	char *must;		/* match must contain this string */
	int moffset;		/* latest point at which must may be located */
	int *charjump;		/* Boyer-Moore char jump table */
	int *matchjump;		/* Boyer-Moore match jump table */
	int 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? */
};

/* misc utilities */
#define	OUT	(-2)	/* a non-character value */
#define ISWORD(c)       (iswalnum((uch)(c)) || (c) == '_')
OpenPOWER on IntegriCloud