usr/src/lib/libast/common/regex/regexec.c

   1 /***********************************************************************
   2 *                                                                      *
   3 *               This software is part of the ast package               *
   4 *          Copyright (c) 1985-2010 AT&T Intellectual Property          *
   5 *                      and is licensed under the                       *
   6 *                  Common Public License, Version 1.0                  *
   7 *                    by AT&T Intellectual Property                     *
   8 *                                                                      *
   9 *                A copy of the License is available at                 *
  10 *            http://www.opensource.org/licenses/cpl1.0.txt             *
  11 *         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
  12 *                                                                      *
  13 *              Information and Software Systems Research               *
  14 *                            AT&T Research                             *
  15 *                           Florham Park NJ                            *
  16 *                                                                      *
  17 *                 Glenn Fowler <gsf@research.att.com>                  *
  18 *                  David Korn <dgk@research.att.com>                   *
  19 *                   Phong Vo <kpv@research.att.com>                    *
  20 *                                                                      *
  21 ***********************************************************************/
  22 #pragma prototyped
  23
  24 /*
  25  * posix regex executor
  26  * single unsized-string interface
  27  */
  28
  29 #include "reglib.h"
  30
  31 /*
  32  * standard wrapper for the sized-record interface
  33  */
  34
  35 int
  36 regexec(const regex_t* p, const char* s, size_t nmatch, regmatch_t* match, regflags_t flags)
  37 {
  38         if (flags & REG_STARTEND)
  39         {
  40                 int             r;
  41                 int             m = match->rm_so;
  42                 regmatch_t*     e;
  43
  44                 if (!(r = regnexec(p, s + m, match->rm_eo - m, nmatch, match, flags)) && m > 0)
  45                         for (e = match + nmatch; match < e; match++)
  46                                 if (match->rm_so >= 0)
  47                                 {
  48                                         match->rm_so += m;
  49                                         match->rm_eo += m;
  50                                 }
  51                 return r;
  52         }
  53         return regnexec(p, s, s ? strlen(s) : 0, nmatch, match, flags);
  54 }