regexec.c revision 1.15.6.1
1 /* $NetBSD: regexec.c,v 1.15.6.1 2002/01/28 20:50:44 nathanw Exp $ */ 2 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. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the University of 22 * California, Berkeley and its contributors. 23 * 4. Neither the name of the University nor the names of its contributors 24 * may be used to endorse or promote products derived from this software 25 * without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37 * SUCH DAMAGE. 38 * 39 * @(#)regexec.c 8.3 (Berkeley) 3/20/94 40 */ 41 42 #include <sys/cdefs.h> 43 #if defined(LIBC_SCCS) && !defined(lint) 44 #if 0 45 static char sccsid[] = "@(#)regexec.c 8.3 (Berkeley) 3/20/94"; 46 #else 47 __RCSID("$NetBSD: regexec.c,v 1.15.6.1 2002/01/28 20:50:44 nathanw Exp $"); 48 #endif 49 #endif /* LIBC_SCCS and not lint */ 50 51 /* 52 * the outer shell of regexec() 53 * 54 * This file includes engine.c *twice*, after muchos fiddling with the 55 * macros that code uses. This lets the same code operate on two different 56 * representations for state sets. 57 */ 58 #include "namespace.h" 59 #include <sys/types.h> 60 61 #include <assert.h> 62 #include <ctype.h> 63 #include <limits.h> 64 #include <regex.h> 65 #include <stdio.h> 66 #include <stdlib.h> 67 #include <string.h> 68 69 #ifdef __weak_alias 70 __weak_alias(regexec,_regexec) 71 #endif 72 73 #include "utils.h" 74 #include "regex2.h" 75 76 /* macros for manipulating states, small version */ 77 #define states unsigned long 78 #define states1 unsigned long /* for later use in regexec() decision */ 79 #define CLEAR(v) ((v) = 0) 80 #define SET0(v, n) ((v) &= ~((unsigned long)1 << (n))) 81 #define SET1(v, n) ((v) |= (unsigned long)1 << (n)) 82 #define ISSET(v, n) (((v) & ((unsigned long)1 << (n))) != 0) 83 #define ASSIGN(d, s) ((d) = (s)) 84 #define EQ(a, b) ((a) == (b)) 85 #define STATEVARS int dummy /* dummy version */ 86 #define STATESETUP(m, n) /* nothing */ 87 #define STATETEARDOWN(m) /* nothing */ 88 #define SETUP(v) ((v) = 0) 89 #define onestate unsigned long 90 #define INIT(o, n) ((o) = (unsigned long)1 << (n)) 91 #define INC(o) ((o) <<= 1) 92 #define ISSTATEIN(v, o) (((v) & (o)) != 0) 93 /* some abbreviations; note that some of these know variable names! */ 94 /* do "if I'm here, I can also be there" etc without branches */ 95 #define FWD(dst, src, n) ((dst) |= ((unsigned long)(src)&(here)) << (n)) 96 #define BACK(dst, src, n) ((dst) |= ((unsigned long)(src)&(here)) >> (n)) 97 #define ISSETBACK(v, n) (((v) & ((unsigned long)here >> (n))) != 0) 98 /* function names */ 99 #define SNAMES /* engine.c looks after details */ 100 101 #include "engine.c" 102 103 /* now undo things */ 104 #undef states 105 #undef CLEAR 106 #undef SET0 107 #undef SET1 108 #undef ISSET 109 #undef ASSIGN 110 #undef EQ 111 #undef STATEVARS 112 #undef STATESETUP 113 #undef STATETEARDOWN 114 #undef SETUP 115 #undef onestate 116 #undef INIT 117 #undef INC 118 #undef ISSTATEIN 119 #undef FWD 120 #undef BACK 121 #undef ISSETBACK 122 #undef SNAMES 123 124 /* macros for manipulating states, large version */ 125 #define states char * 126 #define CLEAR(v) memset(v, 0, (size_t)m->g->nstates) 127 #define SET0(v, n) ((v)[n] = 0) 128 #define SET1(v, n) ((v)[n] = 1) 129 #define ISSET(v, n) ((v)[n]) 130 #define ASSIGN(d, s) memcpy(d, s, (size_t)m->g->nstates) 131 #define EQ(a, b) (memcmp(a, b, (size_t)m->g->nstates) == 0) 132 #define STATEVARS int vn; char *space 133 #define STATESETUP(m, nv) \ 134 if (((m)->space = malloc((size_t)((nv)*(m)->g->nstates))) == NULL) \ 135 return(REG_ESPACE); \ 136 else \ 137 (m)->vn = 0 138 139 #define STATETEARDOWN(m) { free((m)->space); m->space = NULL; } 140 #define SETUP(v) ((v) = &m->space[(size_t)(m->vn++ * m->g->nstates)]) 141 #define onestate int 142 #define INIT(o, n) ((o) = (n)) 143 #define INC(o) ((o)++) 144 #define ISSTATEIN(v, o) ((v)[o]) 145 /* some abbreviations; note that some of these know variable names! */ 146 /* do "if I'm here, I can also be there" etc without branches */ 147 #define FWD(dst, src, n) ((dst)[here+(n)] |= (src)[here]) 148 #define BACK(dst, src, n) ((dst)[here-(n)] |= (src)[here]) 149 #define ISSETBACK(v, n) ((v)[here - (n)]) 150 /* function names */ 151 #define LNAMES /* flag */ 152 153 #include "engine.c" 154 155 /* 156 - regexec - interface for matching 157 = extern int regexec(const regex_t *, const char *, size_t, \ 158 = regmatch_t [], int); 159 = #define REG_NOTBOL 00001 160 = #define REG_NOTEOL 00002 161 = #define REG_STARTEND 00004 162 = #define REG_TRACE 00400 // tracing of execution 163 = #define REG_LARGE 01000 // force large representation 164 = #define REG_BACKR 02000 // force use of backref code 165 * 166 * We put this here so we can exploit knowledge of the state representation 167 * when choosing which matcher to call. Also, by this point the matchers 168 * have been prototyped. 169 */ 170 int /* 0 success, REG_NOMATCH failure */ 171 regexec(preg, string, nmatch, pmatch, eflags) 172 const regex_t *preg; 173 const char *string; 174 size_t nmatch; 175 regmatch_t pmatch[]; 176 int eflags; 177 { 178 struct re_guts *g = preg->re_g; 179 char *s; 180 #ifdef REDEBUG 181 # define GOODFLAGS(f) (f) 182 #else 183 # define GOODFLAGS(f) ((f)&(REG_NOTBOL|REG_NOTEOL|REG_STARTEND)) 184 #endif 185 186 _DIAGASSERT(preg != NULL); 187 _DIAGASSERT(string != NULL); 188 189 if (preg->re_magic != MAGIC1 || g->magic != MAGIC2) 190 return(REG_BADPAT); 191 assert(!(g->iflags&BAD)); 192 if (g->iflags&BAD) /* backstop for no-debug case */ 193 return(REG_BADPAT); 194 eflags = GOODFLAGS(eflags); 195 196 /* LINTED we believe that the regex routines do not change the string */ 197 s = (char *)string; 198 199 if (g->nstates <= CHAR_BIT*sizeof(states1) && !(eflags®_LARGE)) 200 return(smatcher(g, s, nmatch, pmatch, eflags)); 201 else 202 return(lmatcher(g, s, nmatch, pmatch, eflags)); 203 } 204
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