Fixed bug in Gruenbach's code and added test for it

git-svn-id: http://svn.savannah.nongnu.org/svn/rdiff-backup@405 2b77aa54-bcbc-44c9-a7ec-4f6cf2b41109

trunk/rdiff-backup/rdiff_backup/cmodule.c

@@ -283,23 +283,25 @@ int high_water_alloc(void **buf, size_t *bufsize, size_t newsize)
 
 const char *quote(const char *str)
 {
-	static char *quoted_str;
-	static size_t quoted_str_len;
+	static char *quoted_str = NULL;
+	static size_t quoted_str_len = 0;
 	const unsigned char *s;
 	char *q;
-	size_t nonpr;
+	size_t nonpr, total_len;
 
 	if (!str)
 		return str;
 
-	for (nonpr = 0, s = (unsigned char *)str; *s != '\0'; s++)
-		if (!isprint(*s) || isspace(*s) || *s == '\\' || *s == '=')
-			nonpr++;
+	for (nonpr = 0, s = (unsigned char *)str, total_len = 0;
+		 *s != '\0'; s++, total_len++) {
+	  if (!isprint(*s) || isspace(*s) || *s == '\\' || *s == '=')
+		nonpr++;
+	}
 	if (nonpr == 0)
 		return str;
 
 	if (high_water_alloc((void **)&quoted_str, &quoted_str_len,
-			     nonpr * 3 + 1))
+			     nonpr * 3 + total_len + 1))
 		return NULL;
 	for (s = (unsigned char *)str, q = quoted_str; *s != '\0'; s++) {
 		if (!isprint(*s) || isspace(*s) || *s == '\\' || *s == '=') {

trunk/rdiff-backup/testing/ctest.py

@@ -48,6 +48,15 @@ class CTest(unittest.TestCase):
 		assert C.acl_unquote('\\012') == '\n'
 		s = '\\\n\t\145\n\01=='
 		assert C.acl_unquote(C.acl_quote(s)) == s
-		
+
+	def test_acl_quoting2(self):
+		"""This string used to segfault the quoting code, try now"""
+		s = '\xd8\xab\xb1Wb\xae\xc5]\x8a\xbb\x15v*\xf4\x0f!\xf9>\xe2Y\x86\xbb\xab\xdbp\xb0\x84\x13k\x1d\xc2\xf1\xf5e\xa5U\x82\x9aUV\xa0\xf4\xdf4\xba\xfdX\x03\x82\x07s\xce\x9e\x8b\xb34\x04\x9f\x17 \xf4\x8f\xa6\xfa\x97\xab\xd8\xac\xda\x85\xdcKvC\xfa#\x94\x92\x9e\xc9\xb7\xc3_\x0f\x84g\x9aB\x11<=^\xdbM\x13\x96c\x8b\xa7|*"\\\'^$@#!(){}?+ ~` '
+		quoted = C.acl_quote(s)
+		assert C.acl_unquote(quoted) == s
+
+	def test_acl_quoting_equals(self):
+		"""Make sure the equals character is quoted"""
+		assert C.acl_quote('=') != '='
 
 if __name__ == "__main__": unittest.main()