mdw@git.distorted.org.uk Git - anag/blob - pcre.c

   1 /* -*-c-*-
   2  *
   3  * $Id: pcre.c,v 1.1 2003/11/29 23:38:37 mdw Exp $
   4  *
   5  * Matches Perl-compatible regular expressions
   6  *
   7  * (c) 2002 Mark Wooding
   8  */
   9
  10 /*----- Licensing notice --------------------------------------------------*
  11  *
  12  * This file is part of Anag: a simple wordgame helper.
  13  *
  14  * Anag is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2 of the License, or
  17  * (at your option) any later version.
  18  *
  19  * Anag is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with Anag; if not, write to the Free Software Foundation,
  26  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  27  */
  28
  29 /*----- Revision history --------------------------------------------------*
  30  *
  31  * $Log: pcre.c,v $
  32  * Revision 1.1  2003/11/29 23:38:37  mdw
  33  * Debianization.
  34  *
  35  */
  36
  37 /*----- Header files ------------------------------------------------------*/
  38
  39 #ifdef HAVE_CONFIG_H
  40 #  include "config.h"
  41 #endif
  42
  43 #ifndef HAVE_PCRE
  44   extern int dummy;
  45 #else
  46
  47 #include "anag.h"
  48 #include <pcre.h>
  49
  50 /*----- Data structures ---------------------------------------------------*/
  51
  52 typedef struct node_pcre {
  53   node n;
  54   const char *s;
  55   pcre *rx;
  56   pcre_extra *rx_study;
  57   int *ovec;
  58   int ovecsz;
  59 } node_pcre;
  60
  61 /*----- Main code ---------------------------------------------------------*/
  62
  63 /* --- Node matcher --- */
  64
  65 static int n_pcre(node *nn, const char *p, size_t sz)
  66 {
  67   node_pcre *n = (node_pcre *)nn;
  68   int e;
  69
  70   e = pcre_exec(n->rx, n->rx_study, p, sz, 0, 0, n->ovec, n->ovecsz);
  71   if (e >= 0)
  72     return (1);
  73   if (e == PCRE_ERROR_NOMATCH)
  74     return (0);
  75   die("unexpected PCRE error code %d", e);
  76   return (-1);
  77 }
  78
  79 /* --- Node creation --- */
  80
  81 node *pcrenode(const char *const *av)
  82 {
  83   node_pcre *n = xmalloc(sizeof(*n));
  84   const char *e;
  85   int eo;
  86   int c;
  87
  88   n->n.func = n_pcre;
  89   if ((n->rx = pcre_compile(av[0], PCRE_CASELESS, &e, &eo, 0)) == 0)
  90     die("bad regular expression `%s': %s", av[0], e);
  91   n->rx_study = pcre_study(n->rx, 0, &e);
  92   if (e)
  93     die("error studying pattern `%s': %s", av[0], e);
  94   pcre_fullinfo(n->rx, n->rx_study, PCRE_INFO_BACKREFMAX, &c);
  95   n->ovecsz = c * 2;
  96   n->ovec = xmalloc(n->ovecsz * sizeof(*n->ovec));
  97   return (&n->n);
  98 }
  99
 100 /*----- That's all, folks -------------------------------------------------*/
 101
 102 #endif