Added support for regular expression matching, if supported by the C

[anag] / regexp.c

diff --git a/regexp.c b/regexp.c
new file mode 100644 (file)
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--- /dev/null
+++ b/regexp.c
@@ -0,0 +1,104 @@
+/* -*-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