1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 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 #if defined(LIBC_SCCS) && !defined(lint) 39 static char sccsid[] = "@(#)regexec.c 8.3 (Berkeley) 3/20/94"; 40 #endif /* LIBC_SCCS and not lint */ 41 #include <sys/cdefs.h> 42 __FBSDID("$FreeBSD$"); 43 44 /* 45 * the outer shell of regexec() 46 * 47 * This file includes engine.c three times, after muchos fiddling with the 48 * macros that code uses. This lets the same code operate on two different 49 * representations for state sets and characters. 50 */ 51 #include <sys/types.h> 52 #include <stdio.h> 53 #include <stdlib.h> 54 #include <string.h> 55 #include <limits.h> 56 #include <ctype.h> 57 #include <regex.h> 58 #include <wchar.h> 59 #include <wctype.h> 60 61 #include "utils.h" 62 #include "regex2.h" 63 64 static int nope __unused = 0; /* for use in asserts; shuts lint up */ 65 66 static __inline size_t 67 xmbrtowc(wint_t *wi, const char *s, size_t n, mbstate_t *mbs, wint_t dummy) 68 { 69 size_t nr; 70 wchar_t wc; 71 72 nr = mbrtowc(&wc, s, n, mbs); 73 if (wi != NULL) 74 *wi = wc; 75 if (nr == 0) 76 return (1); 77 else if (nr == (size_t)-1 || nr == (size_t)-2) { 78 memset(mbs, 0, sizeof(*mbs)); 79 if (wi != NULL) 80 *wi = dummy; 81 return (1); 82 } else 83 return (nr); 84 } 85 86 static __inline size_t 87 xmbrtowc_dummy(wint_t *wi, 88 const char *s, 89 size_t n __unused, 90 mbstate_t *mbs __unused, 91 wint_t dummy __unused) 92 { 93 94 if (wi != NULL) 95 *wi = (unsigned char)*s; 96 return (1); 97 } 98 99 /* macros for manipulating states, small version */ 100 #define states1 long /* for later use in regexec() decision */ 101 #define states states1 102 #define CLEAR(v) ((v) = 0) 103 #define SET0(v, n) ((v) &= ~((unsigned long)1 << (n))) 104 #define SET1(v, n) ((v) |= (unsigned long)1 << (n)) 105 #define ISSET(v, n) (((v) & ((unsigned long)1 << (n))) != 0) 106 #define ASSIGN(d, s) ((d) = (s)) 107 #define EQ(a, b) ((a) == (b)) 108 #define STATEVARS long dummy /* dummy version */ 109 #define STATESETUP(m, n) /* nothing */ 110 #define STATETEARDOWN(m) /* nothing */ 111 #define SETUP(v) ((v) = 0) 112 #define onestate long 113 #define INIT(o, n) ((o) = (unsigned long)1 << (n)) 114 #define INC(o) ((o) <<= 1) 115 #define ISSTATEIN(v, o) (((v) & (o)) != 0) 116 /* some abbreviations; note that some of these know variable names! */ 117 /* do "if I'm here, I can also be there" etc without branches */ 118 #define FWD(dst, src, n) ((dst) |= ((unsigned long)(src)&(here)) << (n)) 119 #define BACK(dst, src, n) ((dst) |= ((unsigned long)(src)&(here)) >> (n)) 120 #define ISSETBACK(v, n) (((v) & ((unsigned long)here >> (n))) != 0) 121 /* no multibyte support */ 122 #define XMBRTOWC xmbrtowc_dummy 123 #define ZAPSTATE(mbs) ((void)(mbs)) 124 /* function names */ 125 #define SNAMES /* engine.c looks after details */ 126 127 #include "engine.c" 128 129 /* now undo things */ 130 #undef states 131 #undef CLEAR 132 #undef SET0 133 #undef SET1 134 #undef ISSET 135 #undef ASSIGN 136 #undef EQ 137 #undef STATEVARS 138 #undef STATESETUP 139 #undef STATETEARDOWN 140 #undef SETUP 141 #undef onestate 142 #undef INIT 143 #undef INC 144 #undef ISSTATEIN 145 #undef FWD 146 #undef BACK 147 #undef ISSETBACK 148 #undef SNAMES 149 #undef XMBRTOWC 150 #undef ZAPSTATE 151 152 /* macros for manipulating states, large version */ 153 #define states char * 154 #define CLEAR(v) memset(v, 0, m->g->nstates) 155 #define SET0(v, n) ((v)[n] = 0) 156 #define SET1(v, n) ((v)[n] = 1) 157 #define ISSET(v, n) ((v)[n]) 158 #define ASSIGN(d, s) memcpy(d, s, m->g->nstates) 159 #define EQ(a, b) (memcmp(a, b, m->g->nstates) == 0) 160 #define STATEVARS long vn; char *space 161 #define STATESETUP(m, nv) { (m)->space = malloc((nv)*(m)->g->nstates); \ 162 if ((m)->space == NULL) return(REG_ESPACE); \ 163 (m)->vn = 0; } 164 #define STATETEARDOWN(m) { free((m)->space); } 165 #define SETUP(v) ((v) = &m->space[m->vn++ * m->g->nstates]) 166 #define onestate long 167 #define INIT(o, n) ((o) = (n)) 168 #define INC(o) ((o)++) 169 #define ISSTATEIN(v, o) ((v)[o]) 170 /* some abbreviations; note that some of these know variable names! */ 171 /* do "if I'm here, I can also be there" etc without branches */ 172 #define FWD(dst, src, n) ((dst)[here+(n)] |= (src)[here]) 173 #define BACK(dst, src, n) ((dst)[here-(n)] |= (src)[here]) 174 #define ISSETBACK(v, n) ((v)[here - (n)]) 175 /* no multibyte support */ 176 #define XMBRTOWC xmbrtowc_dummy 177 #define ZAPSTATE(mbs) ((void)(mbs)) 178 /* function names */ 179 #define LNAMES /* flag */ 180 181 #include "engine.c" 182 183 /* multibyte character & large states version */ 184 #undef LNAMES 185 #undef XMBRTOWC 186 #undef ZAPSTATE 187 #define XMBRTOWC xmbrtowc 188 #define ZAPSTATE(mbs) memset((mbs), 0, sizeof(*(mbs))) 189 #define MNAMES 190 191 #include "engine.c" 192 193 /* 194 - regexec - interface for matching 195 = extern int regexec(const regex_t *, const char *, size_t, \ 196 = regmatch_t [], int); 197 = #define REG_NOTBOL 00001 198 = #define REG_NOTEOL 00002 199 = #define REG_STARTEND 00004 200 = #define REG_TRACE 00400 // tracing of execution 201 = #define REG_LARGE 01000 // force large representation 202 = #define REG_BACKR 02000 // force use of backref code 203 * 204 * We put this here so we can exploit knowledge of the state representation 205 * when choosing which matcher to call. Also, by this point the matchers 206 * have been prototyped. 207 */ 208 int /* 0 success, REG_NOMATCH failure */ 209 regexec(const regex_t * __restrict preg, 210 const char * __restrict string, 211 size_t nmatch, 212 regmatch_t pmatch[__restrict], 213 int eflags) 214 { 215 struct re_guts *g = preg->re_g; 216 #ifdef REDEBUG 217 # define GOODFLAGS(f) (f) 218 #else 219 # define GOODFLAGS(f) ((f)&(REG_NOTBOL|REG_NOTEOL|REG_STARTEND)) 220 #endif 221 222 if (preg->re_magic != MAGIC1 || g->magic != MAGIC2) 223 return(REG_BADPAT); 224 assert(!(g->iflags&BAD)); 225 if (g->iflags&BAD) /* backstop for no-debug case */ 226 return(REG_BADPAT); 227 eflags = GOODFLAGS(eflags); 228 229 if (MB_CUR_MAX > 1) 230 return(mmatcher(g, string, nmatch, pmatch, eflags)); 231 else if (g->nstates <= CHAR_BIT*sizeof(states1) && !(eflags®_LARGE)) 232 return(smatcher(g, string, nmatch, pmatch, eflags)); 233 else 234 return(lmatcher(g, string, nmatch, pmatch, eflags)); 235 } 236