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 */ 140 int /* 0 success, REG_NOMATCH failure */ 141 llvm_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®EX_BAD)); 154 if (g->iflags®EX_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®_LARGE)) 159 return(smatcher(g, string, nmatch, pmatch, eflags)); 160 else 161 return(lmatcher(g, string, nmatch, pmatch, eflags)); 162 } 163