Debianization.

[anag] / pcre.c

/* -*-c-*-
 *
 * $Id: pcre.c,v 1.1 2003/11/29 23:38:37 mdw Exp $
 *
 * Matches Perl-compatible regular expressions
 *
 * (c) 2002 Mark Wooding
 */

/*----- Licensing notice --------------------------------------------------* 
 *
 * This file is part of Anag: a simple wordgame helper.
 *
 * Anag is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 
 * Anag is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with Anag; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

/*----- Revision history --------------------------------------------------* 
 *
 * $Log: pcre.c,v $
 * Revision 1.1  2003/11/29 23:38:37  mdw
 * Debianization.
 *
 */

/*----- Header files ------------------------------------------------------*/

#ifdef HAVE_CONFIG_H
#  include "config.h"
#endif

#ifndef HAVE_PCRE
  extern int dummy;
#else

#include "anag.h"
#include <pcre.h>

/*----- Data structures ---------------------------------------------------*/

typedef struct node_pcre {
  node n;
  const char *s;
  pcre *rx;
  pcre_extra *rx_study;
  int *ovec;
  int ovecsz;
} node_pcre;

/*----- Main code ---------------------------------------------------------*/

/* --- Node matcher --- */

static int n_pcre(node *nn, const char *p, size_t sz)
{
  node_pcre *n = (node_pcre *)nn;
  int e;

  e = pcre_exec(n->rx, n->rx_study, p, sz, 0, 0, n->ovec, n->ovecsz);
  if (e >= 0)
    return (1);
  if (e == PCRE_ERROR_NOMATCH)
    return (0);
  die("unexpected PCRE error code %d", e);
  return (-1);
}

/* --- Node creation --- */

node *pcrenode(const char *const *av)
{
  node_pcre *n = xmalloc(sizeof(*n));
  const char *e;
  int eo;
  int c;

  n->n.func = n_pcre;
  if ((n->rx = pcre_compile(av[0], PCRE_CASELESS, &e, &eo, 0)) == 0)
    die("bad regular expression `%s': %s", av[0], e);
  n->rx_study = pcre_study(n->rx, 0, &e);
  if (e)
    die("error studying pattern `%s': %s", av[0], e);
  pcre_fullinfo(n->rx, n->rx_study, PCRE_INFO_BACKREFMAX, &c);
  n->ovecsz = c * 2;
  n->ovec = xmalloc(n->ovecsz * sizeof(*n->ovec));
  return (&n->n);
}

/*----- That's all, folks -------------------------------------------------*/

#endif