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regexec.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*          Copyright (c) 1985-2008 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

/*
 * posix regex executor
 * single unsized-string interface
 */

#include "reglib.h"

/*
 * standard wrapper for the sized-record interface
 */

int
regexec(const regex_t* p, const char* s, size_t nmatch, regmatch_t* match, regflags_t flags)
{
      if (flags & REG_STARTEND)
      {
            int         r;
            int         m = match->rm_so;
            regmatch_t* e;

            if (!(r = regnexec(p, s + m, match->rm_eo - m, nmatch, match, flags)) && m > 0)
                  for (e = match + nmatch; match < e; match++)
                        if (match->rm_so >= 0)
                        {
                              match->rm_so += m;
                              match->rm_eo += m;
                        }
            return r;
      }
      return regnexec(p, s, s ? strlen(s) : 0, nmatch, match, flags);
}

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