dir.c::match_pathname(): pay attention to the length of string parameters

This function takes two counted strings: a <pattern, patternlen> pair
and a <pathname, pathlen> pair. But we end up feeding the result to
fnmatch, which expects NUL-terminated strings.

We can fix this by calling the fnmatch_icase_mem function, which
handles re-allocating into a NUL-terminated string if necessary.

While we're at it, we can avoid even calling fnmatch in some cases. In
addition to patternlen, we get "prefix", the size of the pattern that
contains no wildcard characters. We do a straight match of the prefix
part first, and then use fnmatch to cover the rest. But if there are
no wildcards in the pattern at all, we do not even need to call
fnmatch; we would simply be comparing two empty strings.
Signed-off-by: NJeff King <peff@peff.net>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

dir.c

@@ -624,11 +624,22 @@ int match_pathname(const char *pathname, int pathlen,
 		if (strncmp_icase(pattern, name, prefix))
 			return 0;
 		pattern += prefix;
+		patternlen -= prefix;
 		name    += prefix;
 		namelen -= prefix;
+
+		/*
+		 * If the whole pattern did not have a wildcard,
+		 * then our prefix match is all we need; we
+		 * do not need to call fnmatch at all.
+		 */
+		if (!patternlen && !namelen)
+			return 1;
 	}
 
-	return fnmatch_icase(pattern, name, FNM_PATHNAME) == 0;
+	return fnmatch_icase_mem(pattern, patternlen,
+				 name, namelen,
+				 FNM_PATHNAME) == 0;
 }
 
 /* Scan the list and let the last match determine the fate.