1*d1a1db7fSmartijn /* $OpenBSD: regexec.c,v 1.14 2018/07/11 12:38:46 martijn Exp $ */
2df930be7Sderaadt /*-
3df930be7Sderaadt * Copyright (c) 1992, 1993, 1994 Henry Spencer.
4df930be7Sderaadt * Copyright (c) 1992, 1993, 1994
5df930be7Sderaadt * The Regents of the University of California. All rights reserved.
6df930be7Sderaadt *
7df930be7Sderaadt * This code is derived from software contributed to Berkeley by
8df930be7Sderaadt * Henry Spencer.
9df930be7Sderaadt *
10df930be7Sderaadt * Redistribution and use in source and binary forms, with or without
11df930be7Sderaadt * modification, are permitted provided that the following conditions
12df930be7Sderaadt * are met:
13df930be7Sderaadt * 1. Redistributions of source code must retain the above copyright
14df930be7Sderaadt * notice, this list of conditions and the following disclaimer.
15df930be7Sderaadt * 2. Redistributions in binary form must reproduce the above copyright
16df930be7Sderaadt * notice, this list of conditions and the following disclaimer in the
17df930be7Sderaadt * documentation and/or other materials provided with the distribution.
186580fee3Smillert * 3. Neither the name of the University nor the names of its contributors
19df930be7Sderaadt * may be used to endorse or promote products derived from this software
20df930be7Sderaadt * without specific prior written permission.
21df930be7Sderaadt *
22df930be7Sderaadt * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23df930be7Sderaadt * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24df930be7Sderaadt * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25df930be7Sderaadt * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26df930be7Sderaadt * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27df930be7Sderaadt * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28df930be7Sderaadt * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29df930be7Sderaadt * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30df930be7Sderaadt * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31df930be7Sderaadt * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32df930be7Sderaadt * SUCH DAMAGE.
33442a6afdSmillert *
34442a6afdSmillert * @(#)regexec.c 8.3 (Berkeley) 3/20/94
35df930be7Sderaadt */
36df930be7Sderaadt
37df930be7Sderaadt /*
38df930be7Sderaadt * the outer shell of regexec()
39df930be7Sderaadt *
40df930be7Sderaadt * This file includes engine.c *twice*, after muchos fiddling with the
41df930be7Sderaadt * macros that code uses. This lets the same code operate on two different
42df930be7Sderaadt * representations for state sets.
43df930be7Sderaadt */
44df930be7Sderaadt #include <sys/types.h>
45df930be7Sderaadt #include <stdio.h>
46df930be7Sderaadt #include <stdlib.h>
47df930be7Sderaadt #include <string.h>
48df930be7Sderaadt #include <limits.h>
49df930be7Sderaadt #include <ctype.h>
50df930be7Sderaadt #include <regex.h>
51df930be7Sderaadt
52df930be7Sderaadt #include "utils.h"
53df930be7Sderaadt #include "regex2.h"
54df930be7Sderaadt
55df930be7Sderaadt /* macros for manipulating states, small version */
56442a6afdSmillert #define states long
57df930be7Sderaadt #define states1 states /* for later use in regexec() decision */
58df930be7Sderaadt #define CLEAR(v) ((v) = 0)
59442a6afdSmillert #define SET0(v, n) ((v) &= ~((unsigned long)1 << (n)))
60442a6afdSmillert #define SET1(v, n) ((v) |= (unsigned long)1 << (n))
61442a6afdSmillert #define ISSET(v, n) (((v) & ((unsigned long)1 << (n))) != 0)
62df930be7Sderaadt #define ASSIGN(d, s) ((d) = (s))
63df930be7Sderaadt #define EQ(a, b) ((a) == (b))
64442a6afdSmillert #define STATEVARS long dummy /* dummy version */
65df930be7Sderaadt #define STATESETUP(m, n) /* nothing */
66df930be7Sderaadt #define STATETEARDOWN(m) /* nothing */
67df930be7Sderaadt #define SETUP(v) ((v) = 0)
68442a6afdSmillert #define onestate long
69442a6afdSmillert #define INIT(o, n) ((o) = (unsigned long)1 << (n))
70442a6afdSmillert #define INC(o) ((o) <<= 1)
71df930be7Sderaadt #define ISSTATEIN(v, o) (((v) & (o)) != 0)
72df930be7Sderaadt /* some abbreviations; note that some of these know variable names! */
73df930be7Sderaadt /* do "if I'm here, I can also be there" etc without branches */
74442a6afdSmillert #define FWD(dst, src, n) ((dst) |= ((unsigned long)(src)&(here)) << (n))
75442a6afdSmillert #define BACK(dst, src, n) ((dst) |= ((unsigned long)(src)&(here)) >> (n))
76442a6afdSmillert #define ISSETBACK(v, n) (((v) & ((unsigned long)here >> (n))) != 0)
77df930be7Sderaadt /* function names */
78df930be7Sderaadt #define SNAMES /* engine.c looks after details */
79df930be7Sderaadt
80df930be7Sderaadt #include "engine.c"
81df930be7Sderaadt
82df930be7Sderaadt /* now undo things */
83df930be7Sderaadt #undef states
84df930be7Sderaadt #undef CLEAR
85df930be7Sderaadt #undef SET0
86df930be7Sderaadt #undef SET1
87df930be7Sderaadt #undef ISSET
88df930be7Sderaadt #undef ASSIGN
89df930be7Sderaadt #undef EQ
90df930be7Sderaadt #undef STATEVARS
91df930be7Sderaadt #undef STATESETUP
92df930be7Sderaadt #undef STATETEARDOWN
93df930be7Sderaadt #undef SETUP
94df930be7Sderaadt #undef onestate
95df930be7Sderaadt #undef INIT
96df930be7Sderaadt #undef INC
97df930be7Sderaadt #undef ISSTATEIN
98df930be7Sderaadt #undef FWD
99df930be7Sderaadt #undef BACK
100df930be7Sderaadt #undef ISSETBACK
101df930be7Sderaadt #undef SNAMES
102df930be7Sderaadt
103df930be7Sderaadt /* macros for manipulating states, large version */
104df930be7Sderaadt #define states char *
105df930be7Sderaadt #define CLEAR(v) memset(v, 0, m->g->nstates)
106df930be7Sderaadt #define SET0(v, n) ((v)[n] = 0)
107df930be7Sderaadt #define SET1(v, n) ((v)[n] = 1)
108df930be7Sderaadt #define ISSET(v, n) ((v)[n])
109df930be7Sderaadt #define ASSIGN(d, s) memcpy(d, s, m->g->nstates)
110df930be7Sderaadt #define EQ(a, b) (memcmp(a, b, m->g->nstates) == 0)
111442a6afdSmillert #define STATEVARS long vn; char *space
112e786dc0aSdoug #define STATESETUP(m, nv) { (m)->space = reallocarray(NULL, \
113e786dc0aSdoug (m)->g->nstates, (nv)); \
114df930be7Sderaadt if ((m)->space == NULL) return(REG_ESPACE); \
115df930be7Sderaadt (m)->vn = 0; }
116df930be7Sderaadt #define STATETEARDOWN(m) { free((m)->space); }
117df930be7Sderaadt #define SETUP(v) ((v) = &m->space[m->vn++ * m->g->nstates])
118442a6afdSmillert #define onestate long
119df930be7Sderaadt #define INIT(o, n) ((o) = (n))
120df930be7Sderaadt #define INC(o) ((o)++)
121df930be7Sderaadt #define ISSTATEIN(v, o) ((v)[o])
122df930be7Sderaadt /* some abbreviations; note that some of these know variable names! */
123df930be7Sderaadt /* do "if I'm here, I can also be there" etc without branches */
124df930be7Sderaadt #define FWD(dst, src, n) ((dst)[here+(n)] |= (src)[here])
125df930be7Sderaadt #define BACK(dst, src, n) ((dst)[here-(n)] |= (src)[here])
126df930be7Sderaadt #define ISSETBACK(v, n) ((v)[here - (n)])
127df930be7Sderaadt /* function names */
128df930be7Sderaadt #define LNAMES /* flag */
129df930be7Sderaadt
130df930be7Sderaadt #include "engine.c"
131df930be7Sderaadt
132df930be7Sderaadt /*
133df930be7Sderaadt - regexec - interface for matching
134df930be7Sderaadt *
135df930be7Sderaadt * We put this here so we can exploit knowledge of the state representation
136df930be7Sderaadt * when choosing which matcher to call. Also, by this point the matchers
137df930be7Sderaadt * have been prototyped.
138df930be7Sderaadt */
139df930be7Sderaadt int /* 0 success, REG_NOMATCH failure */
regexec(const regex_t * preg,const char * string,size_t nmatch,regmatch_t pmatch[],int eflags)1403d7c72a1Sotto regexec(const regex_t *preg, const char *string, size_t nmatch,
1413d7c72a1Sotto regmatch_t pmatch[], int eflags)
142df930be7Sderaadt {
1433d7c72a1Sotto struct re_guts *g = preg->re_g;
1442be36617Stedu
145df930be7Sderaadt #ifdef REDEBUG
146df930be7Sderaadt # define GOODFLAGS(f) (f)
147df930be7Sderaadt #else
148df930be7Sderaadt # define GOODFLAGS(f) ((f)&(REG_NOTBOL|REG_NOTEOL|REG_STARTEND))
149df930be7Sderaadt #endif
150df930be7Sderaadt
151df930be7Sderaadt if (preg->re_magic != MAGIC1 || g->magic != MAGIC2)
152df930be7Sderaadt return(REG_BADPAT);
153df930be7Sderaadt assert(!(g->iflags&BAD));
154df930be7Sderaadt if (g->iflags&BAD) /* backstop for no-debug case */
155df930be7Sderaadt return(REG_BADPAT);
156df930be7Sderaadt eflags = GOODFLAGS(eflags);
157df930be7Sderaadt
158df930be7Sderaadt if (g->nstates <= CHAR_BIT*sizeof(states1) && !(eflags®_LARGE))
159*d1a1db7fSmartijn return(smatcher(g, string, nmatch, pmatch, eflags));
160df930be7Sderaadt else
161*d1a1db7fSmartijn return(lmatcher(g, string, nmatch, pmatch, eflags));
162df930be7Sderaadt }
163