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Annotation of embedaddon/php/ext/ereg/regex/regexec.c, revision 1.1.1.1

1.1       misho       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&REG_LARGE))
                    135:                return(smatcher(g, (unsigned char *)string, nmatch, pmatch, eflags));
                    136:        else
                    137:                return(lmatcher(g, (unsigned char *)string, nmatch, pmatch, eflags));
                    138: }