1 files changed, 105 insertions, 0 deletions
diff --git a/src/lib/wildcard-match.c b/src/lib/wildcard-match.c
new file mode 100644
index 0000000..c1e2b2e
--- /dev/null
+++ b/src/lib/wildcard-match.c
@@ -0,0 +1,105 @@
+/*
+ * This code would not have been possible without the prior work and
+ * suggestions of various sourced.  Special thanks to Robey for
+ * all his time/help tracking down bugs and his ever-helpful advice.
+ *
+ * 04/09:  Fixed the "*\*" against "*a" bug (caused an endless loop)
+ *
+ *   Chris Fuller  (aka Fred1@IRC & Fwitz@IRC)
+ *     crf@cfox.bchs.uh.edu
+ *
+ * I hereby release this code into the public domain
+ *
+ */
+
+#include "lib.h"
+#include "wildcard-match.h"
+
+#include <ctype.h>
+
+#define WILDS '*'  /* matches 0 or more characters (including spaces) */
+#define WILDQ '?'  /* matches exactly one character */
+
+#define NOMATCH 0
+#define MATCH (match+sofar)
+
+static int wildcard_match_int(const char *data, const char *mask, bool icase)
+{
+  const char *ma = mask, *na = data, *lsm = NULL, *lsn = NULL;
+  int match = 1;
+  int sofar = 0;
+
+  if (na[0] == '\0') {
+	  /* empty string can match only "*" wildcard(s) */
+	  while (ma[0] == '*') ma++;
+	  return ma[0] == '\0' ? MATCH : NOMATCH;
+  }
+  /* find the end of each string */
+  while (*(mask++) != '\0');
+  mask-=2;
+  while (*(data++) != '\0');
+  data-=2;
+
+  while (data >= na) {
+    /* If the mask runs out of chars before the string, fall back on
+     * a wildcard or fail. */
+    if (mask < ma) {
+      if (lsm != NULL) {
+        data = --lsn;
+        mask = lsm;
+        if (data < na)
+          lsm = NULL;
+        sofar = 0;
+      }
+      else
+        return NOMATCH;
+    }
+
+    switch (*mask) {
+    case WILDS:                /* Matches anything */
+      do
+        mask--;                    /* Zap redundant wilds */
+      while ((mask >= ma) && (*mask == WILDS));
+      lsm = mask;
+      lsn = data;
+      match += sofar;
+      sofar = 0;                /* Update fallback pos */
+      if (mask < ma)
+        return MATCH;
+      continue;                 /* Next char, please */
+    case WILDQ:
+      mask--;
+      data--;
+      continue;                 /* '?' always matches */
+    }
+    if (icase ? (i_toupper(*mask) == i_toupper(*data)) :
+	(*mask == *data)) {     /* If matching char */
+      mask--;
+      data--;
+      sofar++;                  /* Tally the match */
+      continue;                 /* Next char, please */
+    }
+    if (lsm != NULL) {          /* To to fallback on '*' */
+      data = --lsn;
+      mask = lsm;
+      if (data < na)
+        lsm = NULL;                /* Rewind to saved pos */
+      sofar = 0;
+      continue;                 /* Next char, please */
+    }
+    return NOMATCH;             /* No fallback=No match */
+  }
+  while ((mask >= ma) && (*mask == WILDS))
+    mask--;                        /* Zap leftover %s & *s */
+  return (mask >= ma) ? NOMATCH : MATCH;   /* Start of both = match */
+}
+
+bool wildcard_match(const char *data, const char *mask)
+{
+	return wildcard_match_int(data, mask, FALSE) != 0;
+}
+
+bool wildcard_match_icase(const char *data, const char *mask)
+{
+	return wildcard_match_int(data, mask, TRUE) != 0;
+}