1 files changed, 20 insertions, 0 deletions
diff --git a/test-string-list.c b/test-string-list.c
index 2d6eda707e..5e9631fe34 100644
--- a/test-string-list.c
+++ b/test-string-list.c
@@ -97,6 +97,26 @@ int main(int argc, char **argv)
 		return 0;
 	}
 
+	if (argc == 4 && !strcmp(argv[1], "longest_prefix")) {
+		/* arguments: <colon-separated-prefixes>|- <string> */
+		struct string_list prefixes = STRING_LIST_INIT_DUP;
+		int retval;
+		const char *prefix_string = argv[2];
+		const char *string = argv[3];
+		const char *match;
+
+		parse_string_list(&prefixes, prefix_string);
+		match = string_list_longest_prefix(&prefixes, string);
+		if (match) {
+			printf("%s\n", match);
+			retval = 0;
+		}
+		else
+			retval = 1;
+		string_list_clear(&prefixes, 0);
+		return retval;
+	}
+
 	fprintf(stderr, "%s: unknown function name: %s\n", argv[0],
 		argv[1] ? argv[1] : "(there was none)");
 	return 1;