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annotate lib/wcsftime.c @ 40231:9b3c79fdfe0b

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strtod: fix clash with strtold Problem reported for RHEL 5 by Jesse Caldwell (Bug#34817). * lib/strtod.c (compute_minus_zero, minus_zero): Simplify by remving the macro / external variable, and having just a function. User changed. This avoids the need for an external variable that might clash.
author Paul Eggert <eggert@cs.ucla.edu>
date Mon, 11 Mar 2019 16:40:29 -0700
parents b06060465f09
children 5a52ef2d4772
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1 /* Work around platform bugs in wcsftime.
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2 Copyright (C) 2017-2019 Free Software Foundation, Inc.
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3
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4 This program is free software: you can redistribute it and/or modify
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5 it under the terms of the GNU General Public License as published by
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6 the Free Software Foundation; either version 3 of the License, or
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7 (at your option) any later version.
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8
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9 This program is distributed in the hope that it will be useful,
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 GNU General Public License for more details.
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13
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14 You should have received a copy of the GNU General Public License
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15 along with this program. If not, see <https://www.gnu.org/licenses/>. */
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16
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17 #include <config.h>
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18
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19 /* Specification. */
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20 #include <wchar.h>
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21
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22 #include <stdlib.h>
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23 #include <string.h>
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24 #include <time.h>
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25
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26 #undef wcsftime
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27
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28 size_t
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29 rpl_wcsftime (wchar_t *buf, size_t bufsize, const wchar_t *format, const struct tm *tp)
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30 {
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31 #if defined _WIN32 && ! defined __CYGWIN__
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32 /* Rectify the value of the environment variable TZ.
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33 There are four possible kinds of such values:
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34 - Traditional US time zone names, e.g. "PST8PDT". Syntax: see
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35 <https://msdn.microsoft.com/en-us/library/90s5c885.aspx>
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36 - Time zone names based on geography, that contain one or more
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37 slashes, e.g. "Europe/Moscow".
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38 - Time zone names based on geography, without slashes, e.g.
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39 "Singapore".
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40 - Time zone names that contain explicit DST rules. Syntax: see
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41 <http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap08.html#tag_08_03>
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42 The Microsoft CRT understands only the first kind. It produces incorrect
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43 results if the value of TZ is of the other kinds.
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44 But in a Cygwin environment, /etc/profile.d/tzset.sh sets TZ to a value
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45 of the second kind for most geographies, or of the first kind in a few
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46 other geographies. If it is of the second kind, neutralize it. For the
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47 Microsoft CRT, an absent or empty TZ means the time zone that the user
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48 has set in the Windows Control Panel.
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49 If the value of TZ is of the third or fourth kind -- Cygwin programs
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50 understand these syntaxes as well --, it does not matter whether we
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51 neutralize it or not, since these values occur only when a Cygwin user
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52 has set TZ explicitly; this case is 1. rare and 2. under the user's
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53 responsibility. */
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54 const char *tz = getenv ("TZ");
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55 if (tz != NULL && strchr (tz, '/') != NULL)
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56 _putenv ("TZ=");
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57 #endif
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58
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59 return wcsftime (buf, bufsize, format, tp);
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60 }