From: Timo Sirainen <tss@iki.fi>
Date: Thu, 18 Mar 2010 02:11:55 +0000 (+0200)
Subject: Added wildcard_match*() for matching strings with '*' and '?' wildcards.
X-Git-Tag: 2.0.beta4~27
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=f2528b977128fbac005fc940012eac9e50022c4d;p=thirdparty%2Fdovecot%2Fcore.git

Added wildcard_match*() for matching strings with '*' and '?' wildcards.

--HG--
branch : HEAD
---

diff --git a/src/lib/Makefile.am b/src/lib/Makefile.am
index ccfbec39c4..28a2ac28f7 100644
--- a/src/lib/Makefile.am
+++ b/src/lib/Makefile.am
@@ -111,6 +111,7 @@ liblib_la_SOURCES = \
 	utc-offset.c \
 	utc-mktime.c \
 	var-expand.c \
+	wildcard-match.c \
 	write-full.c
 
 headers = \
@@ -203,6 +204,7 @@ headers = \
 	utc-offset.h \
 	utc-mktime.h \
 	var-expand.h \
+	wildcard-match.h \
 	write-full.h
 
 test_programs = test-lib
diff --git a/src/lib/wildcard-match.c b/src/lib/wildcard-match.c
new file mode 100644
index 0000000000..99a6fc6e99
--- /dev/null
+++ b/src/lib/wildcard-match.c
@@ -0,0 +1,103 @@
+/*
+ * 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 ecactly one character */
+
+#define NOMATCH 0
+#define MATCH (match+sofar)
+
+static int wildcard_match_int(const char *data, const char *mask, int icase)
+{
+  const char *ma = mask, *na = data, *lsm = 0, *lsn = 0;
+  int match = 1;
+  int sofar = 0;
+
+  /* null strings should never match */
+  if ((ma == 0) || (na == 0) || (!*ma) || (!*na))
+    return NOMATCH;
+  /* find the end of each string */
+  while (*(++mask));
+  mask--;
+  while (*(++data));
+  data--;
+
+  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) {
+        data = --lsn;
+        mask = lsm;
+        if (data < na)
+          lsm = 0;
+        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) {                  /* To to fallback on '*' */
+      data = --lsn;
+      mask = lsm;
+      if (data < na)
+        lsm = 0;                /* 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;
+}
diff --git a/src/lib/wildcard-match.h b/src/lib/wildcard-match.h
new file mode 100644
index 0000000000..cda9fd84ce
--- /dev/null
+++ b/src/lib/wildcard-match.h
@@ -0,0 +1,9 @@
+#ifndef WILDCARD_MATCH_H
+#define WILDCARD_MATCH_H
+
+/* Returns TRUE if mask matches data. mask can contain '*' and '?' wildcards. */
+bool wildcard_match(const char *data, const char *mask);
+/* Like wildcard_match(), but match ASCII characters case-insensitively. */
+bool wildcard_match_icase(const char *data, const char *mask);
+
+#endif