1 /* 2 * Copyright 2010 Nexenta Systems, Inc. All rights reserved. 3 * Copyright (c) 1992, 1993, 1994 Henry Spencer. 4 * Copyright (c) 1992, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Henry Spencer. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 /* 36 * the outer shell of regexec() 37 * 38 * This file includes engine.c three times, after muchos fiddling with the 39 * macros that code uses. This lets the same code operate on two different 40 * representations for state sets and characters. 41 */ 42 #include "lint.h" 43 #include "file64.h" 44 #include <sys/types.h> 45 #include <stdio.h> 46 #include <stdlib.h> 47 #include <string.h> 48 #include <limits.h> 49 #include <ctype.h> 50 #include <regex.h> 51 #include <wchar.h> 52 #include <wctype.h> 53 #include <note.h> 54 #include <assert.h> 55 56 #include "utils.h" 57 #include "regex2.h" 58 59 /* we want _NOTE, but not NOTE (which collides with our own use) */ 60 #undef NOTE 61 62 static size_t 63 xmbrtowc(wint_t *wi, const char *s, size_t n, mbstate_t *mbs, wint_t dummy) 64 { 65 size_t nr; 66 wchar_t wc; 67 68 nr = mbrtowc(&wc, s, n, mbs); 69 if (wi != NULL) 70 *wi = wc; 71 if (nr == 0) 72 return (1); 73 else if (nr == (size_t)-1 || nr == (size_t)-2) { 74 (void) memset(mbs, 0, sizeof (*mbs)); 75 if (wi != NULL) 76 *wi = dummy; 77 return (1); 78 } else 79 return (nr); 80 } 81 82 static size_t 83 xmbrtowc_dummy(wint_t *wi, const char *s, size_t n, mbstate_t *mbs, 84 wint_t dummy) 85 { 86 _NOTE(ARGUNUSED(n)); 87 _NOTE(ARGUNUSED(mbs)); 88 _NOTE(ARGUNUSED(dummy)); 89 90 if (wi != NULL) 91 *wi = (unsigned char)*s; 92 return (1); 93 } 94 95 /* macros for manipulating states, small version */ 96 #define states long 97 #define states1 states /* for later use in regexec() decision */ 98 #define CLEAR(v) ((v) = 0) 99 #define SET0(v, n) ((v) &= ~((unsigned long)1 << (n))) 100 #define SET1(v, n) ((v) |= (unsigned long)1 << (n)) 101 #define ISSET(v, n) (((v) & ((unsigned long)1 << (n))) != 0) 102 #define ASSIGN(d, s) ((d) = (s)) 103 #define EQ(a, b) ((a) == (b)) 104 #define STATEVARS long dummy /* dummy version */ 105 #define STATESETUP(m, n) /* nothing */ 106 #define STATETEARDOWN(m) /* nothing */ 107 #define SETUP(v) ((v) = 0) 108 #define onestate long 109 #define INIT(o, n) ((o) = (unsigned long)1 << (n)) 110 #define INC(o) ((o) <<= 1) 111 #define ISSTATEIN(v, o) (((v) & (o)) != 0) 112 /* some abbreviations; note that some of these know variable names! */ 113 /* do "if I'm here, I can also be there" etc without branches */ 114 #define FWD(dst, src, n) ((dst) |= ((unsigned long)(src)&(here)) << (n)) 115 #define BACK(dst, src, n) ((dst) |= ((unsigned long)(src)&(here)) >> (n)) 116 #define ISSETBACK(v, n) (((v) & ((unsigned long)here >> (n))) != 0) 117 /* no multibyte support */ 118 #define XMBRTOWC xmbrtowc_dummy 119 #define ZAPSTATE(mbs) ((void)(mbs)) 120 /* function names */ 121 #define SNAMES /* engine.c looks after details */ 122 123 #include "engine.c" 124 125 /* now undo things */ 126 #undef states 127 #undef CLEAR 128 #undef SET0 129 #undef SET1 130 #undef ISSET 131 #undef ASSIGN 132 #undef EQ 133 #undef STATEVARS 134 #undef STATESETUP 135 #undef STATETEARDOWN 136 #undef SETUP 137 #undef onestate 138 #undef INIT 139 #undef INC 140 #undef ISSTATEIN 141 #undef FWD 142 #undef BACK 143 #undef ISSETBACK 144 #undef SNAMES 145 #undef XMBRTOWC 146 #undef ZAPSTATE 147 148 /* macros for manipulating states, large version */ 149 #define states char * 150 #define CLEAR(v) (void) memset(v, 0, m->g->nstates) 151 #define SET0(v, n) ((v)[n] = 0) 152 #define SET1(v, n) ((v)[n] = 1) 153 #define ISSET(v, n) ((v)[n]) 154 #define ASSIGN(d, s) (void) memcpy(d, s, m->g->nstates) 155 #define EQ(a, b) (memcmp(a, b, m->g->nstates) == 0) 156 #define STATEVARS long vn; char *space 157 #define STATESETUP(m, nv) { (m)->space = malloc((nv)*(m)->g->nstates); \ 158 if ((m)->space == NULL) \ 159 return (REG_ESPACE); \ 160 (m)->vn = 0; } 161 #define STATETEARDOWN(m) { free((m)->space); } 162 #define SETUP(v) ((v) = &m->space[m->vn++ * m->g->nstates]) 163 #define onestate long 164 #define INIT(o, n) ((o) = (n)) 165 #define INC(o) ((o)++) 166 #define ISSTATEIN(v, o) ((v)[o]) 167 /* some abbreviations; note that some of these know variable names! */ 168 /* do "if I'm here, I can also be there" etc without branches */ 169 #define FWD(dst, src, n) ((dst)[here+(n)] |= (src)[here]) 170 #define BACK(dst, src, n) ((dst)[here-(n)] |= (src)[here]) 171 #define ISSETBACK(v, n) ((v)[here - (n)]) 172 /* no multibyte support */ 173 #define XMBRTOWC xmbrtowc_dummy 174 #define ZAPSTATE(mbs) ((void)(mbs)) 175 /* function names */ 176 #define LNAMES /* flag */ 177 178 #include "engine.c" 179 180 /* multibyte character & large states version */ 181 #undef LNAMES 182 #undef XMBRTOWC 183 #undef ZAPSTATE 184 #define XMBRTOWC xmbrtowc 185 #define ZAPSTATE(mbs) (void) memset((mbs), 0, sizeof (*(mbs))) 186 #define MNAMES 187 188 #include "engine.c" 189 190 /* 191 * regexec - interface for matching 192 * 193 * We put this here so we can exploit knowledge of the state representation 194 * when choosing which matcher to call. Also, by this point the matchers 195 * have been prototyped. 196 */ 197 int /* 0 success, REG_NOMATCH failure */ 198 regexec(const regex_t *_RESTRICT_KYWD preg, const char *_RESTRICT_KYWD string, 199 size_t nmatch, regmatch_t pmatch[_RESTRICT_KYWD], int eflags) 200 { 201 struct re_guts *g = preg->re_g; 202 #ifdef REDEBUG 203 #define GOODFLAGS(f) (f) 204 #else 205 #ifdef REG_STARTEND 206 #define GOODFLAGS(f) ((f)&(REG_NOTBOL|REG_NOTEOL|REG_STARTEND)) 207 #else 208 #define GOODFLAGS(f) ((f)&(REG_NOTBOL|REG_NOTEOL)) 209 #endif 210 #endif 211 212 if (preg->re_magic != MAGIC1 || g->magic != MAGIC2) 213 return (REG_BADPAT); 214 assert(!(g->iflags&BAD)); 215 if (g->iflags&BAD) /* backstop for no-debug case */ 216 return (REG_BADPAT); 217 eflags = GOODFLAGS(eflags); 218 219 if (MB_CUR_MAX > 1) 220 return (mmatcher(g, string, nmatch, pmatch, eflags)); 221 else if (g->nstates <= CHAR_BIT*sizeof (states1) && !(eflags®_LARGE)) 222 return (smatcher(g, string, nmatch, pmatch, eflags)); 223 else 224 return (lmatcher(g, string, nmatch, pmatch, eflags)); 225 } 226