[444] | 1 | /*- |
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| 2 | * Copyright (c) 1992, 1993, 1994 Henry Spencer. |
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| 3 | * Copyright (c) 1992, 1993, 1994 |
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| 4 | * The Regents of the University of California. All rights reserved. |
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| 5 | * |
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| 6 | * This code is derived from software contributed to Berkeley by |
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| 7 | * Henry Spencer. |
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| 8 | * |
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| 9 | * Redistribution and use in source and binary forms, with or without |
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| 10 | * modification, are permitted provided that the following conditions |
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| 11 | * are met: |
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| 12 | * 1. Redistributions of source code must retain the above copyright |
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| 13 | * notice, this list of conditions and the following disclaimer. |
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| 14 | * 2. Redistributions in binary form must reproduce the above copyright |
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| 15 | * notice, this list of conditions and the following disclaimer in the |
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| 16 | * documentation and/or other materials provided with the distribution. |
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| 17 | * 4. Neither the name of the University nor the names of its contributors |
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| 18 | * may be used to endorse or promote products derived from this software |
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| 19 | * without specific prior written permission. |
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| 20 | * |
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| 21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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| 22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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| 23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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| 24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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| 25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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| 26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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| 27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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| 28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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| 29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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| 30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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| 31 | * SUCH DAMAGE. |
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| 32 | * |
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| 33 | * @(#)regexec.c 8.3 (Berkeley) 3/20/94 |
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| 34 | */ |
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| 35 | |
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| 36 | #ifndef _NO_REGEX |
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| 37 | |
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| 38 | #if defined(LIBC_SCCS) && !defined(lint) |
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| 39 | static char sccsid[] = "@(#)regexec.c 8.3 (Berkeley) 3/20/94"; |
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| 40 | #endif /* LIBC_SCCS and not lint */ |
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| 41 | #include <sys/cdefs.h> |
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| 42 | |
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| 43 | /* |
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| 44 | * the outer shell of regexec() |
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| 45 | * |
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| 46 | * This file includes engine.c *twice*, after muchos fiddling with the |
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| 47 | * macros that code uses. This lets the same code operate on two different |
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| 48 | * representations for state sets. |
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| 49 | */ |
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| 50 | #include <sys/types.h> |
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| 51 | #include <stdio.h> |
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| 52 | #include <stdlib.h> |
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| 53 | #include <string.h> |
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| 54 | #include <limits.h> |
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| 55 | #include <ctype.h> |
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| 56 | #include <regex.h> |
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| 57 | |
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| 58 | #include "utils.h" |
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| 59 | #include "regex2.h" |
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| 60 | |
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| 61 | #ifndef NDEBUG |
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| 62 | static int nope = 0; /* for use in asserts; shuts lint up */ |
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| 63 | #endif |
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| 64 | |
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| 65 | /* macros for manipulating states, small version */ |
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| 66 | #define states long |
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| 67 | #define states1 states /* for later use in regexec() decision */ |
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| 68 | #define CLEAR(v) ((v) = 0) |
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| 69 | #define SET0(v, n) ((v) &= ~((unsigned long)1 << (n))) |
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| 70 | #define SET1(v, n) ((v) |= (unsigned long)1 << (n)) |
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| 71 | #define ISSET(v, n) (((v) & ((unsigned long)1 << (n))) != 0) |
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| 72 | #define ASSIGN(d, s) ((d) = (s)) |
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| 73 | #define EQ(a, b) ((a) == (b)) |
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| 74 | #define STATEVARS long dummy /* dummy version */ |
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| 75 | #define STATESETUP(m, n) /* nothing */ |
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| 76 | #define STATETEARDOWN(m) /* nothing */ |
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| 77 | #define SETUP(v) ((v) = 0) |
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| 78 | #define onestate long |
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| 79 | #define INIT(o, n) ((o) = (unsigned long)1 << (n)) |
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| 80 | #define INC(o) ((o) <<= 1) |
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| 81 | #define ISSTATEIN(v, o) (((v) & (o)) != 0) |
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| 82 | /* some abbreviations; note that some of these know variable names! */ |
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| 83 | /* do "if I'm here, I can also be there" etc without branches */ |
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| 84 | #define FWD(dst, src, n) ((dst) |= ((unsigned long)(src)&(here)) << (n)) |
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| 85 | #define BACK(dst, src, n) ((dst) |= ((unsigned long)(src)&(here)) >> (n)) |
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| 86 | #define ISSETBACK(v, n) (((v) & ((unsigned long)here >> (n))) != 0) |
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| 87 | /* function names */ |
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| 88 | #define SNAMES /* engine.c looks after details */ |
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| 89 | |
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| 90 | #include "engine.c" |
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| 91 | |
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| 92 | /* now undo things */ |
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| 93 | #undef states |
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| 94 | #undef CLEAR |
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| 95 | #undef SET0 |
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| 96 | #undef SET1 |
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| 97 | #undef ISSET |
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| 98 | #undef ASSIGN |
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| 99 | #undef EQ |
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| 100 | #undef STATEVARS |
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| 101 | #undef STATESETUP |
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| 102 | #undef STATETEARDOWN |
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| 103 | #undef SETUP |
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| 104 | #undef onestate |
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| 105 | #undef INIT |
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| 106 | #undef INC |
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| 107 | #undef ISSTATEIN |
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| 108 | #undef FWD |
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| 109 | #undef BACK |
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| 110 | #undef ISSETBACK |
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| 111 | #undef SNAMES |
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| 112 | |
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| 113 | /* macros for manipulating states, large version */ |
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| 114 | #define states char * |
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| 115 | #define CLEAR(v) memset(v, 0, m->g->nstates) |
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| 116 | #define SET0(v, n) ((v)[n] = 0) |
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| 117 | #define SET1(v, n) ((v)[n] = 1) |
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| 118 | #define ISSET(v, n) ((v)[n]) |
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| 119 | #define ASSIGN(d, s) memcpy(d, s, m->g->nstates) |
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| 120 | #define EQ(a, b) (memcmp(a, b, m->g->nstates) == 0) |
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| 121 | #define STATEVARS long vn; char *space |
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| 122 | #define STATESETUP(m, nv) { (m)->space = malloc((nv)*(m)->g->nstates); \ |
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| 123 | if ((m)->space == NULL) return(REG_ESPACE); \ |
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| 124 | (m)->vn = 0; } |
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| 125 | #define STATETEARDOWN(m) { free((m)->space); } |
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| 126 | #define SETUP(v) ((v) = &m->space[m->vn++ * m->g->nstates]) |
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| 127 | #define onestate long |
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| 128 | #define INIT(o, n) ((o) = (n)) |
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| 129 | #define INC(o) ((o)++) |
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| 130 | #define ISSTATEIN(v, o) ((v)[o]) |
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| 131 | /* some abbreviations; note that some of these know variable names! */ |
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| 132 | /* do "if I'm here, I can also be there" etc without branches */ |
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| 133 | #define FWD(dst, src, n) ((dst)[here+(n)] |= (src)[here]) |
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| 134 | #define BACK(dst, src, n) ((dst)[here-(n)] |= (src)[here]) |
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| 135 | #define ISSETBACK(v, n) ((v)[here - (n)]) |
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| 136 | /* function names */ |
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| 137 | #define LNAMES /* flag */ |
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| 138 | |
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| 139 | #include "engine.c" |
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| 140 | |
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| 141 | /* |
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| 142 | - regexec - interface for matching |
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| 143 | = extern int regexec(const regex_t *__restrict, const char *__restrict, |
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| 144 | = size_t, regmatch_t [__restrict], int); |
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| 145 | = #define REG_NOTBOL 00001 |
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| 146 | = #define REG_NOTEOL 00002 |
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| 147 | = #define REG_STARTEND 00004 |
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| 148 | = #define REG_TRACE 00400 // tracing of execution |
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| 149 | = #define REG_LARGE 01000 // force large representation |
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| 150 | = #define REG_BACKR 02000 // force use of backref code |
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| 151 | * |
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| 152 | * We put this here so we can exploit knowledge of the state representation |
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| 153 | * when choosing which matcher to call. Also, by this point the matchers |
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| 154 | * have been prototyped. |
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| 155 | */ |
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| 156 | int /* 0 success, REG_NOMATCH failure */ |
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| 157 | regexec(preg, string, nmatch, pmatch, eflags) |
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| 158 | const regex_t *__restrict preg; |
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| 159 | const char *__restrict string; |
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| 160 | size_t nmatch; |
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| 161 | regmatch_t pmatch[__restrict]; |
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| 162 | int eflags; |
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| 163 | { |
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| 164 | struct re_guts *g = preg->re_g; |
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| 165 | #ifdef REDEBUG |
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| 166 | # define GOODFLAGS(f) (f) |
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| 167 | #else |
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| 168 | # define GOODFLAGS(f) ((f)&(REG_NOTBOL|REG_NOTEOL|REG_STARTEND)) |
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| 169 | #endif |
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| 170 | |
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| 171 | if (preg->re_magic != MAGIC1 || g->magic != MAGIC2) |
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| 172 | return(REG_BADPAT); |
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| 173 | assert(!(g->iflags&BAD)); |
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| 174 | if (g->iflags&BAD) /* backstop for no-debug case */ |
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| 175 | return(REG_BADPAT); |
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| 176 | eflags = GOODFLAGS(eflags); |
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| 177 | |
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| 178 | if (g->nstates <= CHAR_BIT*sizeof(states1) && !(eflags®_LARGE)) |
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| 179 | return(smatcher(g, (char *)string, nmatch, pmatch, eflags)); |
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| 180 | else |
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| 181 | return(lmatcher(g, (char *)string, nmatch, pmatch, eflags)); |
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| 182 | } |
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| 183 | |
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| 184 | #endif /* !_NO_REGEX */ |
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