+/* -*-c-*-
+ *
+ * $Id: regexp.c,v 1.1 2002/08/11 12:58:09 mdw Exp $
+ *
+ * Matches 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: regexp.c,v $
+ * Revision 1.1 2002/08/11 12:58:09 mdw
+ * Added support for regular expression matching, if supported by the C
+ * library.
+ *
+ * Revision 1.1 2001/02/04 17:14:42 mdw
+ * Initial checkin
+ *
+ */
+
+/*----- Header files ------------------------------------------------------*/
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#ifndef HAVE_REGCOMP
+ extern int dummy;
+#else
+
+#include "anag.h"
+#include <regex.h>
+
+/*----- Data structures ---------------------------------------------------*/
+
+typedef struct node_regexp {
+ node n;
+ const char *s;
+ regex_t rx;
+} node_regexp;
+
+/*----- Main code ---------------------------------------------------------*/
+
+/* --- Node matcher --- */
+
+static int n_regexp(node *nn, const char *p, size_t sz)
+{
+ node_regexp *n = (node_regexp *)nn;
+ int e;
+
+ switch (e = regexec(&n->rx, p, 0, 0, 0)) {
+ case 0:
+ return 1;
+ case REG_NOMATCH:
+ return 0;
+ default: {
+ char buf[256];
+ regerror(e, &n->rx, buf, sizeof(buf));
+ die("error matching regexp `%s' against `%s': %s",
+ n->s, p, buf);
+ } break;
+ }
+ return (0);
+}
+
+/* --- Node creation --- */
+
+node *regexp(const char *const *av)
+{
+ node_regexp *n = xmalloc(sizeof(*n));
+ int e;
+ n->n.func = n_regexp;
+ if ((e = regcomp(&n->rx, av[0],
+ REG_EXTENDED | REG_ICASE | REG_NOSUB)) != 0) {
+ char buf[256];
+ regerror(e, &n->rx, buf, sizeof(buf));
+ die("bad regular expression `%s': %s", av[0], buf);
+ }
+ return (&n->n);
+}
+
+/*----- That's all, folks -------------------------------------------------*/
+
+#endif