diff options
| -rw-r--r-- | date.c | 29 |
1 files changed, 29 insertions, 0 deletions
@@ -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; |