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aca75e962f
* lib/tzset.c (tzset): Elaborate comment, based on explanations by Paul Eggert. * lib/ctime.c (rpl_ctime): Likewise. * lib/localtime.c (rpl_localtime): Likewise. * lib/mktime.c (mktime): Likewise. * lib/strftime-fixes.c (rpl_strftime): Likewise. * lib/wcsftime.c (rpl_wcsftime): Likewise.
61 lines
2.6 KiB
C
61 lines
2.6 KiB
C
/* Work around platform bugs in wcsftime.
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Copyright (C) 2017 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include <config.h>
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/* Specification. */
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#include <wchar.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#undef wcsftime
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size_t
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rpl_wcsftime (wchar_t *buf, size_t bufsize, const wchar_t *format, const struct tm *tp)
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{
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#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
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/* Rectify the value of the environment variable TZ.
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There are four possible kinds of such values:
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- Traditional US time zone names, e.g. "PST8PDT". Syntax: see
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<https://msdn.microsoft.com/en-us/library/90s5c885.aspx>
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- Time zone names based on geography, that contain one or more
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slashes, e.g. "Europe/Moscow".
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- Time zone names based on geography, without slashes, e.g.
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"Singapore".
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- Time zone names that contain explicit DST rules. Syntax: see
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<http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap08.html#tag_08_03>
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The Microsoft CRT understands only the first kind. It produces incorrect
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results if the value of TZ is of the other kinds.
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But in a Cygwin environment, /etc/profile.d/tzset.sh sets TZ to a value
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of the second kind for most geographies, or of the first kind in a few
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other geographies. If it is of the second kind, neutralize it. For the
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Microsoft CRT, an absent or empty TZ means the time zone that the user
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has set in the Windows Control Panel.
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If the value of TZ is of the third or fourth kind -- Cygwin programs
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understand these syntaxes as well --, it does not matter whether we
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neutralize it or not, since these values occur only when a Cygwin user
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has set TZ explicitly; this case is 1. rare and 2. under the user's
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responsibility. */
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const char *tz = getenv ("TZ");
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if (tz != NULL && strchr (tz, '/') != NULL)
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_putenv ("TZ=");
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#endif
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return wcsftime (buf, bufsize, format, tp);
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}
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