1/*-
2 * This code is derived from OpenBSD's libc/regex, original license follows:
3 *
4 * Copyright (c) 1992, 1993, 1994 Henry Spencer.
5 * Copyright (c) 1992, 1993, 1994
6 * The Regents of the University of California. All rights reserved.
7 *
8 * This code is derived from software contributed to Berkeley by
9 * Henry Spencer.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 *
35 * @(#)regexec.c 8.3 (Berkeley) 3/20/94
36 */
37
38/*
39 * the outer shell of llvm_regexec()
40 *
41 * This file includes engine.inc *twice*, after muchos fiddling with the
42 * macros that code uses. This lets the same code operate on two different
43 * representations for state sets.
44 */
45#include <sys/types.h>
46#include <stdio.h>
47#include <stdlib.h>
48#include <string.h>
49#include <limits.h>
50#include <ctype.h>
51#include "regex_impl.h"
52
53#include "regutils.h"
54#include "regex2.h"
55
56/* macros for manipulating states, small version */
57/* FIXME: 'states' is assumed as 'long' on small version. */
58#define states1 long /* for later use in llvm_regexec() decision */
59#define states states1
60#define CLEAR(v) ((v) = 0)
61#define SET0(v, n) ((v) &= ~((unsigned long)1 << (n)))
62#define SET1(v, n) ((v) |= (unsigned long)1 << (n))
63#define ISSET(v, n) (((v) & ((unsigned long)1 << (n))) != 0)
64#define ASSIGN(d, s) ((d) = (s))
65#define EQ(a, b) ((a) == (b))
66#define STATEVARS long dummy /* dummy version */
67#define STATESETUP(m, n) /* nothing */
68#define STATETEARDOWN(m) /* nothing */
69#define SETUP(v) ((v) = 0)
70#define onestate long
71#define INIT(o, n) ((o) = (unsigned long)1 << (n))
72#define INC(o) ((o) = (unsigned long)(o) << 1)
73#define ISSTATEIN(v, o) (((v) & (o)) != 0)
74/* some abbreviations; note that some of these know variable names! */
75/* do "if I'm here, I can also be there" etc without branches */
76#define FWD(dst, src, n) ((dst) |= ((unsigned long)(src)&(here)) << (n))
77#define BACK(dst, src, n) ((dst) |= ((unsigned long)(src)&(here)) >> (n))
78#define ISSETBACK(v, n) (((v) & ((unsigned long)here >> (n))) != 0)
79/* function names */
80#define SNAMES /* engine.inc looks after details */
81
82#include "regengine.inc"
83
84/* now undo things */
85#undef states
86#undef CLEAR
87#undef SET0
88#undef SET1
89#undef ISSET
90#undef ASSIGN
91#undef EQ
92#undef STATEVARS
93#undef STATESETUP
94#undef STATETEARDOWN
95#undef SETUP
96#undef onestate
97#undef INIT
98#undef INC
99#undef ISSTATEIN
100#undef FWD
101#undef BACK
102#undef ISSETBACK
103#undef SNAMES
104
105/* macros for manipulating states, large version */
106#define states char *
107#define CLEAR(v) memset(v, 0, m->g->nstates)
108#define SET0(v, n) ((v)[n] = 0)
109#define SET1(v, n) ((v)[n] = 1)
110#define ISSET(v, n) ((v)[n])
111#define ASSIGN(d, s) memmove(d, s, m->g->nstates)
112#define EQ(a, b) (memcmp(a, b, m->g->nstates) == 0)
113#define STATEVARS long vn; char *space
114#define STATESETUP(m, nv) { (m)->space = malloc((nv)*(m)->g->nstates); \
115 if ((m)->space == NULL) return(REG_ESPACE); \
116 (m)->vn = 0; }
117#define STATETEARDOWN(m) { free((m)->space); }
118#define SETUP(v) ((v) = &m->space[m->vn++ * m->g->nstates])
119#define onestate long
120#define INIT(o, n) ((o) = (n))
121#define INC(o) ((o)++)
122#define ISSTATEIN(v, o) ((v)[o])
123/* some abbreviations; note that some of these know variable names! */
124/* do "if I'm here, I can also be there" etc without branches */
125#define FWD(dst, src, n) ((dst)[here+(n)] |= (src)[here])
126#define BACK(dst, src, n) ((dst)[here-(n)] |= (src)[here])
127#define ISSETBACK(v, n) ((v)[here - (n)])
128/* function names */
129#define LNAMES /* flag */
130
131#include "regengine.inc"
132
133/*
134 - llvm_regexec - interface for matching
135 *
136 * We put this here so we can exploit knowledge of the state representation
137 * when choosing which matcher to call. Also, by this point the matchers
138 * have been prototyped.
139 */
140int /* 0 success, REG_NOMATCH failure */
141llvm_regexec(const llvm_regex_t *preg, const char *string, size_t nmatch,
142 llvm_regmatch_t pmatch[], int eflags)
143{
144 struct re_guts *g = preg->re_g;
145#ifdef REDEBUG
146# define GOODFLAGS(f) (f)
147#else
148# define GOODFLAGS(f) ((f)&(REG_NOTBOL|REG_NOTEOL|REG_STARTEND))
149#endif
150
151 if (preg->re_magic != MAGIC1 || g->magic != MAGIC2)
152 return(REG_BADPAT);
153 assert(!(g->iflags&REGEX_BAD));
154 if (g->iflags&REGEX_BAD) /* backstop for no-debug case */
155 return(REG_BADPAT);
156 eflags = GOODFLAGS(eflags);
157
158 if (g->nstates <= (long)(CHAR_BIT*sizeof(states1)) && !(eflags&REG_LARGE))
159 return(smatcher(g, string, nmatch, pmatch, eflags));
160 else
161 return(lmatcher(g, string, nmatch, pmatch, eflags));
162}
163