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90 lines
3.4 KiB
C
90 lines
3.4 KiB
C
/* declarations for strftime.c
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Copyright (C) 2002, 2004, 2008-2024 Free Software Foundation, Inc.
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This file is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation, either version 3 of the
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License, or (at your option) any later version.
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This file 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 Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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#include <time.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Formats the broken-down time *__TP, with additional __NS nanoseconds,
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into the buffer __S of size __MAXSIZE, according to the rules of the
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LC_TIME category of the current locale.
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Uses the time zone __TZ.
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If *__TP represents local time, __TZ should be set to
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tzalloc (getenv ("TZ")).
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If *__TP represents universal time (a.k.a. GMT), __TZ should be set to
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(timezone_t) 0.
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The format string __FORMAT, including GNU extensions, is described in
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the GNU libc's strftime() documentation:
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<https://www.gnu.org/software/libc/manual/html_node/Formatting-Calendar-Time.html>
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Additionally, the following conversion is supported:
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%N The number of nanoseconds, passed as __NS argument.
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Here's a summary of the available conversions (= format directives):
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literal characters %n %t %%
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date:
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century %C
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year %Y %y
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week-based year %G %g
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month (in year) %m %B %b %h
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week in year %U %W %V
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day in year %j
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day (in month) %d %e
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day in week %u %w %A %a
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year, month, day %x %F %D
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time:
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half-day %p %P
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hour %H %k %I %l
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minute (in hour) %M
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hour, minute %R
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second (in minute) %S
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hour, minute, second %r %T %X
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second (since epoch) %s
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date and time: %c
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time zone: %z %Z
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nanosecond %N
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Stores the result, as a string with a trailing NUL character, at the
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beginning of the array __S[0..__MAXSIZE-1], if it fits, and returns
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the length of that string, not counting the trailing NUL. In this case,
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errno is preserved if the return value is 0.
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If it does not fit, this function sets errno to ERANGE and returns 0.
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Upon other errors, this function sets errno and returns 0 as well.
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Note: The errno behavior is in draft POSIX 202x plus some requested
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changes to POSIX.
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This function is like strftime, but with two more arguments:
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* __TZ instead of the local timezone information,
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* __NS as the number of nanoseconds in the %N directive.
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*/
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size_t nstrftime (char *restrict __s, size_t __maxsize,
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char const *__format,
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struct tm const *__tp, timezone_t __tz, int __ns);
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/* Like nstrftime, except that it uses the "C" locale instead of the
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current locale. */
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size_t c_nstrftime (char *restrict __s, size_t __maxsize,
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char const *__format,
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struct tm const *__tp, timezone_t __tz, int __ns);
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#ifdef __cplusplus
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}
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#endif
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