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re_comp.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*          Copyright (c) 1985-2010 AT&T Intellectual Property          *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                    by AT&T Intellectual Property                     *
*                                                                      *
*                A copy of the License is available at                 *
*            http://www.opensource.org/licenses/cpl1.0.txt             *
*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
*                                                                      *
*              Information and Software Systems Research               *
*                            AT&T Research                             *
*                           Florham Park NJ                            *
*                                                                      *
*                 Glenn Fowler <gsf@research.att.com>                  *
*                  David Korn <dgk@research.att.com>                   *
*                   Phong Vo <kpv@research.att.com>                    *
*                                                                      *
***********************************************************************/
#pragma prototyped
/*
 * re_comp implementation
 */

#include <ast.h>
#include <re_comp.h>
#include <regex.h>

#undef      error
#undef      valid

static struct
{
      char  error[64];
      regex_t     re;
      int   valid;
} state;

char*
re_comp(const char* pattern)
{
      register int      r;

      if (!pattern || !*pattern)
      {
            if (state.valid)
                  return 0;
            r = REG_BADPAT;
      }
      else
      {
            if (state.valid)
            {
                  state.valid = 0;
                  regfree(&state.re);
            }
            if (!(r = regcomp(&state.re, pattern, REG_LENIENT|REG_NOSUB|REG_NULL)))
            {
                  state.valid = 1;
                  return 0;
            }
      }
      regerror(r, &state.re, state.error, sizeof(state.error));
      return state.error;
}

int
re_exec(const char* subject)
{
      if (state.valid && subject)
            switch (regexec(&state.re, subject, 0, NiL, 0))
            {
            case 0:
                  return 1;
            case REG_NOMATCH:
                  return 0;
            }
      return -1;
}

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