1 /* 2 * the outer shell of regexec() 3 * 4 * This file includes engine.c *twice*, after muchos fiddling with the 5 * macros that code uses. This lets the same code operate on two different 6 * representations for state sets. 7 */ 8 #include <sys/types.h> 9 #include <stdio.h> 10 #include <stdlib.h> 11 #include <string.h> 12 #include <limits.h> 13 #include <ctype.h> 14 15 #include "regex.h" 16 #include "utils.h" 17 #include "regex2.h" 18 19 #define PHP_REGEX_NOPE 0; /* for use in asserts; shuts lint up */ 20 21 /* macros for manipulating states, small version */ 22 #define states unsigned 23 #define states1 unsigned /* for later use in regexec() decision */ 24 #define CLEAR(v) ((v) = 0) 25 #define SET0(v, n) ((v) &= ~((unsigned)1 << (n))) 26 #define SET1(v, n) ((v) |= (unsigned)1 << (n)) 27 #define ISSET(v, n) ((v) & ((unsigned)1 << (n))) 28 #define ASSIGN(d, s) ((d) = (s)) 29 #define EQ(a, b) ((a) == (b)) 30 #define STATEVARS int dummy /* dummy version */ 31 #define STATESETUP(m, n) /* nothing */ 32 #define STATETEARDOWN(m) /* nothing */ 33 #define SETUP(v) ((v) = 0) 34 #define onestate unsigned 35 #define INIT(o, n) ((o) = (unsigned)1 << (n)) 36 #define INC(o) ((o) <<= 1) 37 #define ISSTATEIN(v, o) ((v) & (o)) 38 /* some abbreviations; note that some of these know variable names! */ 39 /* do "if I'm here, I can also be there" etc without branches */ 40 #define FWD(dst, src, n) ((dst) |= ((unsigned)(src)&(here)) << (n)) 41 #define BACK(dst, src, n) ((dst) |= ((unsigned)(src)&(here)) >> (n)) 42 #define ISSETBACK(v, n) ((v) & ((unsigned)here >> (n))) 43 /* function names */ 44 #define SNAMES /* engine.c looks after details */ 45 46 #include "engine.c" 47 48 /* now undo things */ 49 #undef states 50 #undef CLEAR 51 #undef SET0 52 #undef SET1 53 #undef ISSET 54 #undef ASSIGN 55 #undef EQ 56 #undef STATEVARS 57 #undef STATESETUP 58 #undef STATETEARDOWN 59 #undef SETUP 60 #undef onestate 61 #undef INIT 62 #undef INC 63 #undef ISSTATEIN 64 #undef FWD 65 #undef BACK 66 #undef ISSETBACK 67 #undef SNAMES 68 69 /* macros for manipulating states, large version */ 70 #define states unsigned char * 71 #define CLEAR(v) memset(v, 0, m->g->nstates) 72 #define SET0(v, n) ((v)[n] = 0) 73 #define SET1(v, n) ((v)[n] = 1) 74 #define ISSET(v, n) ((v)[n]) 75 #define ASSIGN(d, s) memcpy(d, s, m->g->nstates) 76 #define EQ(a, b) (memcmp(a, b, m->g->nstates) == 0) 77 #define STATEVARS int vn; unsigned char *space 78 #define STATESETUP(m, nv) { (m)->space = malloc((nv)*(m)->g->nstates); \ 79 if ((m)->space == NULL) return(REG_ESPACE); \ 80 (m)->vn = 0; } 81 #define STATETEARDOWN(m) { free((m)->space); } 82 #define SETUP(v) ((v) = &m->space[m->vn++ * m->g->nstates]) 83 #define onestate int 84 #define INIT(o, n) ((o) = (n)) 85 #define INC(o) ((o)++) 86 #define ISSTATEIN(v, o) ((v)[o]) 87 /* some abbreviations; note that some of these know variable names! */ 88 /* do "if I'm here, I can also be there" etc without branches */ 89 #define FWD(dst, src, n) ((dst)[here+(n)] |= (src)[here]) 90 #define BACK(dst, src, n) ((dst)[here-(n)] |= (src)[here]) 91 #define ISSETBACK(v, n) ((v)[here - (n)]) 92 /* function names */ 93 #define LNAMES /* flag */ 94 95 #include "engine.c" 96 97 /* 98 - regexec - interface for matching 99 = API_EXPORT(int) regexec(const regex_t *, const char *, size_t, \ 100 = regmatch_t [], int); 101 = #define REG_NOTBOL 00001 102 = #define REG_NOTEOL 00002 103 = #define REG_STARTEND 00004 104 = #define REG_TRACE 00400 // tracing of execution 105 = #define REG_LARGE 01000 // force large representation 106 = #define REG_BACKR 02000 // force use of backref code 107 * 108 * We put this here so we can exploit knowledge of the state representation 109 * when choosing which matcher to call. Also, by this point the matchers 110 * have been prototyped. 111 */ 112 API_EXPORT(int) /* 0 success, REG_NOMATCH failure */ 113 regexec(preg, string, nmatch, pmatch, eflags) 114 const regex_t *preg; 115 const char *string; 116 size_t nmatch; 117 regmatch_t pmatch[]; 118 int eflags; 119 { 120 register struct re_guts *g = preg->re_g; 121 #ifdef REDEBUG 122 # define GOODFLAGS(f) (f) 123 #else 124 # define GOODFLAGS(f) ((f)&(REG_NOTBOL|REG_NOTEOL|REG_STARTEND)) 125 #endif 126 127 if (preg->re_magic != MAGIC1 || g->magic != MAGIC2) 128 return(REG_BADPAT); 129 assert(!(g->iflags&BAD)); 130 if (g->iflags&BAD) /* backstop for no-debug case */ 131 return(REG_BADPAT); 132 eflags = GOODFLAGS(eflags); 133 134 if (g->nstates <= CHAR_BIT*sizeof(states1) && !(eflags®_LARGE)) 135 return(smatcher(g, (unsigned char *)string, nmatch, pmatch, eflags)); 136 else 137 return(lmatcher(g, (unsigned char *)string, nmatch, pmatch, eflags)); 138 } 139
