tests/dfa-match-aux.c

   1 /* Auxiliary program to test a DFA code path that cannot be triggered
   2    by grep or gawk.
   3    Copyright 2014-2019 Free Software Foundation, Inc.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3, or (at your option)
   8    any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program; if not, write to the Free Software
  17    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
  18    02110-1301, USA.  */
  19
  20 #include <config.h>
  21 #include <locale.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <regex.h>
  26 #include <dfa.h>
  27 #include <localeinfo.h>
  28
  29 #include "getprogname.h"
  30
  31 _Noreturn void
  32 dfaerror (char const *mesg)
  33 {
  34   printf ("dfaerror: %s\n", mesg);
  35   exit (EXIT_FAILURE);
  36 }
  37
  38 _Noreturn void
  39 dfawarn (char const *mesg)
  40 {
  41   printf ("dfawarn: %s\n", mesg);
  42   exit (EXIT_FAILURE);
  43 }
  44
  45 int
  46 main (int argc, char **argv)
  47 {
  48   struct dfa *dfa;
  49   char *beg, *end, *p;
  50   int allow_nl;
  51   struct localeinfo localeinfo;
  52
  53   if (argc < 3)
  54     exit (EXIT_FAILURE);
  55
  56   setlocale (LC_ALL, "");
  57   init_localeinfo (&localeinfo);
  58
  59   dfa = dfaalloc ();
  60   dfasyntax (dfa, &localeinfo, RE_SYNTAX_GREP | RE_NO_EMPTY_RANGES, 0);
  61   dfacomp (argv[1], strlen (argv[1]), dfa, 0);
  62
  63   beg = argv[2];
  64   end = argv[2] + strlen (argv[2]);
  65   allow_nl = argc > 3 && atoi (argv[3]);
  66
  67   p = dfaexec (dfa, beg, end, allow_nl, NULL, NULL);
  68
  69   if (p != NULL)
  70     printf ("%zd\n", p - beg);
  71
  72   exit (EXIT_SUCCESS);
  73 }