string-util: Disallow empty prefixes in parse_boolean_term

Xapian doesn't consider ":abc" to be a prefixed term.  This makes
parse_boolean_term similarly reject queries with an empty prefix.

diff --git a/util/string-util.c b/util/string-util.c
index aba9aa836e6522c7c51be56458dfee6fd48618cb..a5622d7a209dfee96b90e5e3dbd698cc455ad6df 100644 (file)
--- a/util/string-util.c
+++ b/util/string-util.c
@@ -127,7 +127,7 @@ parse_boolean_term (void *ctx, const char *str,
     /* Parse prefix */
     str = skip_space (str);
     const char *pos = strchr (str, ':');
-    if (! pos)
+    if (! pos || pos == str)
        goto FAIL;
     *prefix_out = talloc_strndup (ctx, str, pos - str);
     if (! *prefix_out) {