diff options
| author | Ron Yorston <rmy@pobox.com> | 2021-09-16 10:26:14 +0100 |
|---|---|---|
| committer | Denys Vlasenko <vda.linux@googlemail.com> | 2021-09-17 00:11:30 +0200 |
| commit | 9fe1548bbfde548d54acaab113656a56ea0ccc72 (patch) | |
| tree | babe79b4f502417ca91a8fab3099f29ff718de19 /libbb/time.c | |
| parent | 83e20cb81ca6d22a1ca268a0a64523b5af67325a (diff) | |
| download | busybox-9fe1548bbfde548d54acaab113656a56ea0ccc72.tar.gz | |
date,touch: allow timezone offsets in dates
Allow ISO 8601 style dates to include a timezone offset. Like
the '@' format these dates aren't relative to the user's current
timezone and shouldn't be subject to DST adjustment.
- The implementation uses the strptime() '%z' format specifier.
This an extension which may not be available so the use of
timezones is a configuration option.
- The 'touch' applet has been updated to respect whether DST
adjustment is required, matching 'date'.
function old new delta
parse_datestr 624 730 +106
static.fmt_str 106 136 +30
touch_main 388 392 +4
date_main 818 819 +1
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 4/0 up/down: 141/0) Total: 141 bytes
Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'libbb/time.c')
| -rw-r--r-- | libbb/time.c | 35 |
1 files changed, 31 insertions, 4 deletions
diff --git a/libbb/time.c b/libbb/time.c index 365b1df02..41a69c754 100644 --- a/libbb/time.c +++ b/libbb/time.c @@ -8,7 +8,9 @@ */ #include "libbb.h" -void FAST_FUNC parse_datestr(const char *date_str, struct tm *ptm) +/* Returns 0 if the time structure contains an absolute UTC time which + * should not be subject to DST adjustment by the caller. */ +int FAST_FUNC parse_datestr(const char *date_str, struct tm *ptm) { char end = '\0'; #if ENABLE_DESKTOP @@ -27,6 +29,10 @@ void FAST_FUNC parse_datestr(const char *date_str, struct tm *ptm) "%b %d %T %Y" "\0" /* month_name d HH:MM:SS YYYY */ "%Y-%m-%d %R" "\0" /* yyyy-mm-dd HH:MM */ "%Y-%m-%d %T" "\0" /* yyyy-mm-dd HH:MM:SS */ +#if ENABLE_FEATURE_TIMEZONE + "%Y-%m-%d %R %z" "\0" /* yyyy-mm-dd HH:MM TZ */ + "%Y-%m-%d %T %z" "\0" /* yyyy-mm-dd HH:MM:SS TZ */ +#endif "%Y-%m-%d %H" "\0" /* yyyy-mm-dd HH */ "%Y-%m-%d" "\0" /* yyyy-mm-dd */ /* extra NUL */; @@ -38,8 +44,28 @@ void FAST_FUNC parse_datestr(const char *date_str, struct tm *ptm) fmt = fmt_str; while (*fmt) { endp = strptime(date_str, fmt, ptm); - if (endp && *endp == '\0') - return; + if (endp && *endp == '\0') { +#if ENABLE_FEATURE_TIMEZONE + if (strchr(fmt, 'z')) { + time_t t; + struct tm *utm; + + /* we have timezone offset: obtain Unix time_t */ + ptm->tm_sec -= ptm->tm_gmtoff; + ptm->tm_isdst = 0; + t = timegm(ptm); + if (t == (time_t)-1) + break; + /* convert Unix time_t to struct tm in user's locale */ + utm = localtime(&t); + if (!utm) + break; + *ptm = *utm; + return 0; + } +#endif + return 1; + } *ptm = save; while (*++fmt) continue; @@ -124,7 +150,7 @@ void FAST_FUNC parse_datestr(const char *date_str, struct tm *ptm) struct tm *lt = localtime(&t); if (lt) { *ptm = *lt; - return; + return 0; } } end = '1'; @@ -241,6 +267,7 @@ void FAST_FUNC parse_datestr(const char *date_str, struct tm *ptm) if (end != '\0') { bb_error_msg_and_die(bb_msg_invalid_date, date_str); } + return 1; } time_t FAST_FUNC validate_tm_time(const char *date_str, struct tm *ptm) |