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-rw-r--r--date.c29
1 files changed, 29 insertions, 0 deletions
diff --git a/date.c b/date.c
index 896fbb4806..099ddbe7fc 100644
--- a/date.c
+++ b/date.c
@@ -585,6 +585,33 @@ static int date_string(unsigned long date, int offset, char *buf, int len)
return snprintf(buf, len, "%lu %c%02d%02d", date, sign, offset / 60, offset % 60);
}
+/*
+ * Parse a string like "0 +0000" as ancient timestamp near epoch, but
+ * only when it appears not as part of any other string.
+ */
+static int match_object_header_date(const char *date, unsigned long *timestamp, int *offset)
+{
+ char *end;
+ unsigned long stamp;
+ int ofs;
+
+ if (*date < '0' || '9' <= *date)
+ return -1;
+ stamp = strtoul(date, &end, 10);
+ if (*end != ' ' || stamp == ULONG_MAX || (end[1] != '+' && end[1] != '-'))
+ return -1;
+ date = end + 2;
+ ofs = strtol(date, &end, 10);
+ if ((*end != '\0' && (*end != '\n')) || end != date + 4)
+ return -1;
+ ofs = (ofs / 100) * 60 + (ofs % 100);
+ if (date[-1] == '-')
+ ofs = -ofs;
+ *timestamp = stamp;
+ *offset = ofs;
+ return 0;
+}
+
/* Gr. strptime is crap for this; it doesn't have a way to require RFC2822
(i.e. English) day/month names, and it doesn't work correctly with %z. */
int parse_date_basic(const char *date, unsigned long *timestamp, int *offset)
@@ -610,6 +637,8 @@ int parse_date_basic(const char *date, unsigned long *timestamp, int *offset)
*offset = -1;
tm_gmt = 0;
+ if (!match_object_header_date(date, timestamp, offset))
+ return 0; /* success */
for (;;) {
int match = 0;
unsigned char c = *date;