139 lines
4.1 KiB
C
139 lines
4.1 KiB
C
/*
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* the outer shell of regexec()
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*
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* This file includes engine.c *twice*, after muchos fiddling with the
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* macros that code uses. This lets the same code operate on two different
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* representations for state sets.
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*/
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#include <sys/types.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <limits.h>
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#include <ctype.h>
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#include "regex.h"
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#include "utils.h"
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#include "regex2.h"
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static int nope = 0; /* for use in asserts; shuts lint up */
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/* macros for manipulating states, small version */
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#define states unsigned
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#define states1 unsigned /* for later use in regexec() decision */
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#define CLEAR(v) ((v) = 0)
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#define SET0(v, n) ((v) &= ~((unsigned)1 << (n)))
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#define SET1(v, n) ((v) |= (unsigned)1 << (n))
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#define ISSET(v, n) ((v) & ((unsigned)1 << (n)))
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#define ASSIGN(d, s) ((d) = (s))
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#define EQ(a, b) ((a) == (b))
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#define STATEVARS int dummy /* dummy version */
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#define STATESETUP(m, n) /* nothing */
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#define STATETEARDOWN(m) /* nothing */
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#define SETUP(v) ((v) = 0)
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#define onestate unsigned
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#define INIT(o, n) ((o) = (unsigned)1 << (n))
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#define INC(o) ((o) <<= 1)
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#define ISSTATEIN(v, o) ((v) & (o))
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/* some abbreviations; note that some of these know variable names! */
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/* do "if I'm here, I can also be there" etc without branches */
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#define FWD(dst, src, n) ((dst) |= ((unsigned)(src)&(here)) << (n))
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#define BACK(dst, src, n) ((dst) |= ((unsigned)(src)&(here)) >> (n))
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#define ISSETBACK(v, n) ((v) & ((unsigned)here >> (n)))
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/* function names */
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#define SNAMES /* engine.c looks after details */
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#include "engine.c"
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/* now undo things */
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#undef states
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#undef CLEAR
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#undef SET0
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#undef SET1
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#undef ISSET
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#undef ASSIGN
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#undef EQ
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#undef STATEVARS
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#undef STATESETUP
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#undef STATETEARDOWN
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#undef SETUP
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#undef onestate
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#undef INIT
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#undef INC
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#undef ISSTATEIN
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#undef FWD
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#undef BACK
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#undef ISSETBACK
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#undef SNAMES
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/* macros for manipulating states, large version */
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#define states char *
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#define CLEAR(v) memset(v, 0, m->g->nstates)
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#define SET0(v, n) ((v)[n] = 0)
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#define SET1(v, n) ((v)[n] = 1)
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#define ISSET(v, n) ((v)[n])
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#define ASSIGN(d, s) memcpy(d, s, m->g->nstates)
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#define EQ(a, b) (memcmp(a, b, m->g->nstates) == 0)
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#define STATEVARS int vn; char *space
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#define STATESETUP(m, nv) { (m)->space = malloc((nv)*(m)->g->nstates); \
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if ((m)->space == NULL) return(REG_ESPACE); \
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(m)->vn = 0; }
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#define STATETEARDOWN(m) { free((m)->space); }
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#define SETUP(v) ((v) = &m->space[m->vn++ * m->g->nstates])
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#define onestate int
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#define INIT(o, n) ((o) = (n))
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#define INC(o) ((o)++)
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#define ISSTATEIN(v, o) ((v)[o])
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/* some abbreviations; note that some of these know variable names! */
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/* do "if I'm here, I can also be there" etc without branches */
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#define FWD(dst, src, n) ((dst)[here+(n)] |= (src)[here])
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#define BACK(dst, src, n) ((dst)[here-(n)] |= (src)[here])
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#define ISSETBACK(v, n) ((v)[here - (n)])
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/* function names */
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#define LNAMES /* flag */
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#include "engine.c"
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/*
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- regexec - interface for matching
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= extern int regexec(const regex_t *, const char *, size_t, \
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= regmatch_t [], int);
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= #define REG_NOTBOL 00001
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= #define REG_NOTEOL 00002
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= #define REG_STARTEND 00004
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= #define REG_TRACE 00400 // tracing of execution
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= #define REG_LARGE 01000 // force large representation
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= #define REG_BACKR 02000 // force use of backref code
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*
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* We put this here so we can exploit knowledge of the state representation
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* when choosing which matcher to call. Also, by this point the matchers
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* have been prototyped.
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*/
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int /* 0 success, REG_NOMATCH failure */
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regexec(preg, string, nmatch, pmatch, eflags)
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const regex_t *preg;
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const char *string;
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size_t nmatch;
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regmatch_t pmatch[];
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int eflags;
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{
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register struct re_guts *g = preg->re_g;
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#ifdef REDEBUG
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# define GOODFLAGS(f) (f)
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#else
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# define GOODFLAGS(f) ((f)&(REG_NOTBOL|REG_NOTEOL|REG_STARTEND))
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#endif
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if (preg->re_magic != MAGIC1 || g->magic != MAGIC2)
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return(REG_BADPAT);
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assert(!(g->iflags&BAD));
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if (g->iflags&BAD) /* backstop for no-debug case */
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return(REG_BADPAT);
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eflags = GOODFLAGS(eflags);
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if (g->nstates <= CHAR_BIT*sizeof(states1) && !(eflags®_LARGE))
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return(smatcher(g, (char *)string, nmatch, pmatch, eflags));
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else
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return(lmatcher(g, (char *)string, nmatch, pmatch, eflags));
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}
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