1 file changed, 33 insertions, 0 deletions
diff --git a/source/shared.c b/source/shared.c
index 59f1c8e..058d938 100644
--- a/source/shared.c
+++ b/source/shared.c
@@ -439,6 +439,39 @@ int cgit_parse_snapshots_mask(const char *str)
 	return rv;
 }
 
+/*
+ * Git's parse_date_format() dies on anything it does not recognize, which
+ * would turn a typo in cgitrc into a failed request, so gate it behind the
+ * set of formats cgit documents and leave the mode alone otherwise.
+ */
+void cgit_parse_date_format(const char *format, struct date_mode *mode)
+{
+	static const char * const names[] = {
+		"default", "human", "iso", "iso-strict", "iso8601",
+		"iso8601-strict", "local", "raw", "relative", "rfc",
+		"rfc2822", "short", "unix",
+	};
+	const char *rest;
+	size_t i;
+
+	if (skip_prefix(format, "format:", &rest)) {
+		// an empty strftime format would render every date blank
+		if (*rest)
+			parse_date_format(format, mode);
+		return;
+	}
+
+	for (i = 0; i < ARRAY_SIZE(names); i++) {
+		if (!skip_prefix(format, names[i], &rest))
+			continue;
+		// "iso" also prefixes "iso8601", so keep looking on a partial hit
+		if (*rest && strcmp(rest, "-local"))
+			continue;
+		parse_date_format(format, mode);
+		return;
+	}
+}
+
 typedef struct {
 	char * name;
 	char * value;