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date,touch: allow timezone offsets in dates

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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>
This commit is contained in:
Ron Yorston
2021-09-16 10:26:14 +01:00
committed by Denys Vlasenko
parent 83e20cb81c
commit 9fe1548bbf
6 changed files with 83 additions and 10 deletions
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11
libbb/Config.src
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@@ -395,3 +395,14 @@ config FEATURE_HWIB
default y
help
Support for printing infiniband addresses in network applets.
config FEATURE_TIMEZONE
bool "Allow timezone in dates"
default y
depends on DESKTOP
help
Permit the use of timezones when parsing user-provided data
strings, e.g. '1996-04-09 12:45:00 -0500'.
This requires support for the '%z' extension to strptime() which
may not be available in all implementations.