682 lines
17 KiB
C
682 lines
17 KiB
C
/* $NetBSD: strftime.c,v 1.39 2017/03/11 18:23:14 christos Exp $ */
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/* Convert a broken-down timestamp to a string. */
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/* Copyright 1989 The Regents of the University of California.
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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3. Neither the name of the University nor the names of its contributors
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may be used to endorse or promote products derived from this software
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without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS" AND
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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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SUCH DAMAGE. */
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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static char elsieid[] = "@(#)strftime.c 7.64";
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static char elsieid[] = "@(#)strftime.c 8.3";
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#else
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__RCSID("$NetBSD: strftime.c,v 1.39 2017/03/11 18:23:14 christos Exp $");
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#endif
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#endif /* LIBC_SCCS and not lint */
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#include "namespace.h"
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#include <stddef.h>
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#include <assert.h>
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#include <locale.h>
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#include "setlocale_local.h"
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/*
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** Based on the UCB version with the copyright notice appearing above.
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**
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** This is ANSIish only when "multibyte character == plain character".
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*/
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#include "private.h"
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/*
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** We don't use these extensions in strftime operation even when
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** supported by the local tzcode configuration. A strictly
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** conforming C application may leave them in undefined state.
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*/
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#ifdef _LIBC
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#undef TM_ZONE
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#undef TM_GMTOFF
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#endif
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#include <fcntl.h>
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#include <locale.h>
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#ifdef __weak_alias
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__weak_alias(strftime_l, _strftime_l)
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__weak_alias(strftime_lz, _strftime_lz)
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__weak_alias(strftime_z, _strftime_z)
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#endif
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#include "sys/localedef.h"
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#define _TIME_LOCALE(loc) \
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((_TimeLocale *)((loc)->part_impl[(size_t)LC_TIME]))
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#define c_fmt d_t_fmt
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static char * _add(const char *, char *, const char *);
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static char * _conv(int, const char *, char *, const char *);
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static char * _fmt(const timezone_t, const char *, const struct tm *, char *,
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const char *, int *, locale_t);
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static char * _yconv(int, int, bool, bool, char *, const char *);
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#if !HAVE_POSIX_DECLS
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extern char * tzname[];
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#endif
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#ifndef YEAR_2000_NAME
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#define YEAR_2000_NAME "CHECK_STRFTIME_FORMATS_FOR_TWO_DIGIT_YEARS"
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#endif /* !defined YEAR_2000_NAME */
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#define IN_NONE 0
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#define IN_SOME 1
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#define IN_THIS 2
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#define IN_ALL 3
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size_t
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strftime_z(const timezone_t sp, char * __restrict s, size_t maxsize,
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const char * __restrict format, const struct tm * __restrict t)
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{
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return strftime_lz(sp, s, maxsize, format, t, _current_locale());
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}
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#if HAVE_STRFTIME_L
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size_t
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strftime_l(char *s, size_t maxsize, char const *format, struct tm const *t,
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locale_t locale)
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{
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/* Just call strftime, as only the C locale is supported. */
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return strftime(s, maxsize, format, t);
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}
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#endif
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size_t
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strftime_lz(const timezone_t sp, char *const s, const size_t maxsize,
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const char *const format, const struct tm *const t, locale_t loc)
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{
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char * p;
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int warn;
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warn = IN_NONE;
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p = _fmt(sp, format, t, s, s + maxsize, &warn, loc);
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#ifndef NO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU
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if (warn != IN_NONE && getenv(YEAR_2000_NAME) != NULL) {
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(void) fprintf(stderr, "\n");
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(void) fprintf(stderr, "strftime format \"%s\" ", format);
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(void) fprintf(stderr, "yields only two digits of years in ");
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if (warn == IN_SOME)
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(void) fprintf(stderr, "some locales");
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else if (warn == IN_THIS)
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(void) fprintf(stderr, "the current locale");
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else (void) fprintf(stderr, "all locales");
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(void) fprintf(stderr, "\n");
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}
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#endif /* !defined NO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU */
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if (p == s + maxsize)
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return 0;
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*p = '\0';
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return p - s;
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}
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static char *
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_fmt(const timezone_t sp, const char *format, const struct tm *t, char *pt,
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const char *ptlim, int *warnp, locale_t loc)
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{
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for ( ; *format; ++format) {
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if (*format == '%') {
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label:
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switch (*++format) {
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case '\0':
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--format;
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break;
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case 'A':
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pt = _add((t->tm_wday < 0 ||
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t->tm_wday >= DAYSPERWEEK) ?
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"?" : _TIME_LOCALE(loc)->day[t->tm_wday],
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pt, ptlim);
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continue;
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case 'a':
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pt = _add((t->tm_wday < 0 ||
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t->tm_wday >= DAYSPERWEEK) ?
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"?" : _TIME_LOCALE(loc)->abday[t->tm_wday],
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pt, ptlim);
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continue;
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case 'B':
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pt = _add((t->tm_mon < 0 ||
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t->tm_mon >= MONSPERYEAR) ?
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"?" : _TIME_LOCALE(loc)->mon[t->tm_mon],
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pt, ptlim);
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continue;
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case 'b':
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case 'h':
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pt = _add((t->tm_mon < 0 ||
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t->tm_mon >= MONSPERYEAR) ?
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"?" : _TIME_LOCALE(loc)->abmon[t->tm_mon],
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pt, ptlim);
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continue;
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case 'C':
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/*
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** %C used to do a...
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** _fmt("%a %b %e %X %Y", t);
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** ...whereas now POSIX 1003.2 calls for
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** something completely different.
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** (ado, 1993-05-24)
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*/
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pt = _yconv(t->tm_year, TM_YEAR_BASE,
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true, false, pt, ptlim);
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continue;
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case 'c':
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{
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int warn2 = IN_SOME;
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pt = _fmt(sp, _TIME_LOCALE(loc)->c_fmt, t, pt,
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ptlim, &warn2, loc);
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if (warn2 == IN_ALL)
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warn2 = IN_THIS;
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if (warn2 > *warnp)
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*warnp = warn2;
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}
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continue;
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case 'D':
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pt = _fmt(sp, "%m/%d/%y", t, pt, ptlim, warnp,
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loc);
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continue;
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case 'd':
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pt = _conv(t->tm_mday, "%02d", pt, ptlim);
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continue;
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case 'E':
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case 'O':
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/*
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** C99 locale modifiers.
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** The sequences
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** %Ec %EC %Ex %EX %Ey %EY
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** %Od %oe %OH %OI %Om %OM
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** %OS %Ou %OU %OV %Ow %OW %Oy
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** are supposed to provide alternate
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** representations.
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*/
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goto label;
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case 'e':
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pt = _conv(t->tm_mday, "%2d", pt, ptlim);
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continue;
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case 'F':
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pt = _fmt(sp, "%Y-%m-%d", t, pt, ptlim, warnp,
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loc);
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continue;
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case 'H':
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pt = _conv(t->tm_hour, "%02d", pt, ptlim);
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continue;
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case 'I':
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pt = _conv((t->tm_hour % 12) ?
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(t->tm_hour % 12) : 12,
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"%02d", pt, ptlim);
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continue;
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case 'j':
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pt = _conv(t->tm_yday + 1, "%03d", pt, ptlim);
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continue;
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case 'k':
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/*
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** This used to be...
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** _conv(t->tm_hour % 12 ?
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** t->tm_hour % 12 : 12, 2, ' ');
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** ...and has been changed to the below to
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** match SunOS 4.1.1 and Arnold Robbins'
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** strftime version 3.0. That is, "%k" and
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** "%l" have been swapped.
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** (ado, 1993-05-24)
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*/
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pt = _conv(t->tm_hour, "%2d", pt, ptlim);
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continue;
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#ifdef KITCHEN_SINK
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case 'K':
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/*
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** After all this time, still unclaimed!
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*/
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pt = _add("kitchen sink", pt, ptlim);
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continue;
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#endif /* defined KITCHEN_SINK */
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case 'l':
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/*
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** This used to be...
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** _conv(t->tm_hour, 2, ' ');
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** ...and has been changed to the below to
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** match SunOS 4.1.1 and Arnold Robbin's
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** strftime version 3.0. That is, "%k" and
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** "%l" have been swapped.
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** (ado, 1993-05-24)
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*/
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pt = _conv((t->tm_hour % 12) ?
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(t->tm_hour % 12) : 12,
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"%2d", pt, ptlim);
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continue;
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case 'M':
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pt = _conv(t->tm_min, "%02d", pt, ptlim);
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continue;
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case 'm':
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pt = _conv(t->tm_mon + 1, "%02d", pt, ptlim);
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continue;
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case 'n':
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pt = _add("\n", pt, ptlim);
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continue;
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case 'p':
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pt = _add((t->tm_hour >= (HOURSPERDAY / 2)) ?
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_TIME_LOCALE(loc)->am_pm[1] :
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_TIME_LOCALE(loc)->am_pm[0],
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pt, ptlim);
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continue;
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case 'R':
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pt = _fmt(sp, "%H:%M", t, pt, ptlim, warnp,
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loc);
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continue;
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case 'r':
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pt = _fmt(sp, _TIME_LOCALE(loc)->t_fmt_ampm, t,
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pt, ptlim, warnp, loc);
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continue;
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case 'S':
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pt = _conv(t->tm_sec, "%02d", pt, ptlim);
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continue;
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case 's':
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{
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struct tm tm;
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char buf[INT_STRLEN_MAXIMUM(
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time_t) + 1];
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time_t mkt;
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tm = *t;
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mkt = mktime(&tm);
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/* CONSTCOND */
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if (TYPE_SIGNED(time_t))
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(void)snprintf(buf, sizeof(buf),
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"%jd", (intmax_t) mkt);
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else (void)snprintf(buf, sizeof(buf),
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"%ju", (uintmax_t) mkt);
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pt = _add(buf, pt, ptlim);
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}
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continue;
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case 'T':
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pt = _fmt(sp, "%H:%M:%S", t, pt, ptlim, warnp,
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loc);
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continue;
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case 't':
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pt = _add("\t", pt, ptlim);
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continue;
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case 'U':
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pt = _conv((t->tm_yday + DAYSPERWEEK -
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t->tm_wday) / DAYSPERWEEK,
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"%02d", pt, ptlim);
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continue;
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case 'u':
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/*
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** From Arnold Robbins' strftime version 3.0:
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** "ISO 8601: Weekday as a decimal number
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** [1 (Monday) - 7]"
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** (ado, 1993-05-24)
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*/
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pt = _conv((t->tm_wday == 0) ?
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DAYSPERWEEK : t->tm_wday,
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"%d", pt, ptlim);
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continue;
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case 'V': /* ISO 8601 week number */
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case 'G': /* ISO 8601 year (four digits) */
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case 'g': /* ISO 8601 year (two digits) */
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/*
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** From Arnold Robbins' strftime version 3.0: "the week number of the
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** year (the first Monday as the first day of week 1) as a decimal number
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** (01-53)."
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** (ado, 1993-05-24)
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**
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** From <http://www.ft.uni-erlangen.de/~mskuhn/iso-time.html> by Markus Kuhn:
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** "Week 01 of a year is per definition the first week which has the
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** Thursday in this year, which is equivalent to the week which contains
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** the fourth day of January. In other words, the first week of a new year
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** is the week which has the majority of its days in the new year. Week 01
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** might also contain days from the previous year and the week before week
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** 01 of a year is the last week (52 or 53) of the previous year even if
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** it contains days from the new year. A week starts with Monday (day 1)
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** and ends with Sunday (day 7). For example, the first week of the year
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** 1997 lasts from 1996-12-30 to 1997-01-05..."
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** (ado, 1996-01-02)
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*/
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{
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int year;
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int base;
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int yday;
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int wday;
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int w;
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year = t->tm_year;
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base = TM_YEAR_BASE;
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yday = t->tm_yday;
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wday = t->tm_wday;
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for ( ; ; ) {
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int len;
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int bot;
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int top;
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len = isleap_sum(year, base) ?
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DAYSPERLYEAR :
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DAYSPERNYEAR;
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/*
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** What yday (-3 ... 3) does
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** the ISO year begin on?
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*/
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bot = ((yday + 11 - wday) %
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DAYSPERWEEK) - 3;
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/*
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** What yday does the NEXT
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** ISO year begin on?
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*/
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top = bot -
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(len % DAYSPERWEEK);
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if (top < -3)
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top += DAYSPERWEEK;
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top += len;
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if (yday >= top) {
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++base;
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w = 1;
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break;
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}
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if (yday >= bot) {
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w = 1 + ((yday - bot) /
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DAYSPERWEEK);
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break;
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}
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--base;
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yday += isleap_sum(year, base) ?
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DAYSPERLYEAR :
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DAYSPERNYEAR;
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}
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#ifdef XPG4_1994_04_09
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if ((w == 52 &&
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t->tm_mon == TM_JANUARY) ||
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(w == 1 &&
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t->tm_mon == TM_DECEMBER))
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w = 53;
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#endif /* defined XPG4_1994_04_09 */
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if (*format == 'V')
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pt = _conv(w, "%02d",
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pt, ptlim);
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else if (*format == 'g') {
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*warnp = IN_ALL;
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pt = _yconv(year, base,
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false, true,
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pt, ptlim);
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} else pt = _yconv(year, base,
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true, true,
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pt, ptlim);
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}
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continue;
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case 'v':
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/*
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** From Arnold Robbins' strftime version 3.0:
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** "date as dd-bbb-YYYY"
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** (ado, 1993-05-24)
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*/
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pt = _fmt(sp, "%e-%b-%Y", t, pt, ptlim, warnp,
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loc);
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continue;
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case 'W':
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pt = _conv((t->tm_yday + DAYSPERWEEK -
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(t->tm_wday ?
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(t->tm_wday - 1) :
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(DAYSPERWEEK - 1))) / DAYSPERWEEK,
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"%02d", pt, ptlim);
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continue;
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case 'w':
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pt = _conv(t->tm_wday, "%d", pt, ptlim);
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continue;
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case 'X':
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pt = _fmt(sp, _TIME_LOCALE(loc)->t_fmt, t, pt,
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ptlim, warnp, loc);
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continue;
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case 'x':
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{
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int warn2 = IN_SOME;
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pt = _fmt(sp, _TIME_LOCALE(loc)->d_fmt, t, pt,
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ptlim, &warn2, loc);
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if (warn2 == IN_ALL)
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warn2 = IN_THIS;
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if (warn2 > *warnp)
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*warnp = warn2;
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}
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continue;
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case 'y':
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*warnp = IN_ALL;
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pt = _yconv(t->tm_year, TM_YEAR_BASE,
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false, true,
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pt, ptlim);
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continue;
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case 'Y':
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pt = _yconv(t->tm_year, TM_YEAR_BASE,
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true, true,
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pt, ptlim);
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continue;
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case 'Z':
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#ifdef TM_ZONE
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pt = _add(t->TM_ZONE, pt, ptlim);
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#endif /* defined TM_ZONE */
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if (t->tm_isdst >= 0)
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pt = _add((sp ?
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tzgetname(sp, t->tm_isdst) :
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tzname[t->tm_isdst != 0]),
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pt, ptlim);
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/*
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** C99 says that %Z must be replaced by the
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** empty string if the time zone is not
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** determinable.
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*/
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continue;
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case 'z':
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#if defined TM_GMTOFF || defined USG_COMPAT || defined ALTZONE
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{
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long diff;
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char const * sign;
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bool negative;
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if (t->tm_isdst < 0)
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continue;
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# ifdef TM_GMTOFF
|
|
diff = (int)t->TM_GMTOFF;
|
|
# else
|
|
/*
|
|
** C99 says that the UT offset must
|
|
** be computed by looking only at
|
|
** tm_isdst. This requirement is
|
|
** incorrect, since it means the code
|
|
** must rely on magic (in this case
|
|
** altzone and timezone), and the
|
|
** magic might not have the correct
|
|
** offset. Doing things correctly is
|
|
** tricky and requires disobeying C99;
|
|
** see GNU C strftime for details.
|
|
** For now, punt and conform to the
|
|
** standard, even though it's incorrect.
|
|
**
|
|
** C99 says that %z must be replaced by the
|
|
** empty string if the time zone is not
|
|
** determinable, so output nothing if the
|
|
** appropriate variables are not available.
|
|
*/
|
|
# ifndef STD_INSPIRED
|
|
if (t->tm_isdst == 0)
|
|
# ifdef USG_COMPAT
|
|
diff = -timezone;
|
|
# else
|
|
continue;
|
|
# endif
|
|
else
|
|
# ifdef ALTZONE
|
|
diff = -altzone;
|
|
# else
|
|
continue;
|
|
# endif
|
|
# else
|
|
{
|
|
struct tm tmp;
|
|
time_t lct, gct;
|
|
|
|
/*
|
|
** Get calendar time from t
|
|
** being treated as local.
|
|
*/
|
|
tmp = *t; /* mktime discards const */
|
|
lct = mktime(&tmp);
|
|
|
|
if (lct == (time_t)-1)
|
|
continue;
|
|
|
|
/*
|
|
** Get calendar time from t
|
|
** being treated as GMT.
|
|
**/
|
|
tmp = *t; /* mktime discards const */
|
|
gct = timegm(&tmp);
|
|
|
|
if (gct == (time_t)-1)
|
|
continue;
|
|
|
|
/* LINTED difference will fit int */
|
|
diff = (intmax_t)gct - (intmax_t)lct;
|
|
}
|
|
# endif
|
|
# endif
|
|
negative = diff < 0;
|
|
if (diff == 0) {
|
|
#ifdef TM_ZONE
|
|
negative = t->TM_ZONE[0] == '-';
|
|
#else
|
|
negative
|
|
= (t->tm_isdst < 0
|
|
|| tzname[t->tm_isdst != 0][0] == '-');
|
|
#endif
|
|
}
|
|
if (negative) {
|
|
sign = "-";
|
|
diff = -diff;
|
|
} else sign = "+";
|
|
pt = _add(sign, pt, ptlim);
|
|
diff /= SECSPERMIN;
|
|
diff = (diff / MINSPERHOUR) * 100 +
|
|
(diff % MINSPERHOUR);
|
|
_DIAGASSERT(__type_fit(int, diff));
|
|
pt = _conv((int)diff, "%04d", pt, ptlim);
|
|
}
|
|
#endif
|
|
continue;
|
|
#if 0
|
|
case '+':
|
|
pt = _fmt(sp, _TIME_LOCALE(loc)->date_fmt, t,
|
|
pt, ptlim, warnp, loc);
|
|
continue;
|
|
#endif
|
|
case '%':
|
|
/*
|
|
** X311J/88-090 (4.12.3.5): if conversion char is
|
|
** undefined, behavior is undefined. Print out the
|
|
** character itself as printf(3) also does.
|
|
*/
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
if (pt == ptlim)
|
|
break;
|
|
*pt++ = *format;
|
|
}
|
|
return pt;
|
|
}
|
|
|
|
size_t
|
|
strftime(char *s, size_t maxsize, const char *format, const struct tm *t)
|
|
{
|
|
tzset();
|
|
return strftime_z(NULL, s, maxsize, format, t);
|
|
}
|
|
|
|
size_t
|
|
strftime_l(char * __restrict s, size_t maxsize, const char * __restrict format,
|
|
const struct tm * __restrict t, locale_t loc)
|
|
{
|
|
tzset();
|
|
return strftime_lz(NULL, s, maxsize, format, t, loc);
|
|
}
|
|
|
|
static char *
|
|
_conv(int n, const char *format, char *pt, const char *ptlim)
|
|
{
|
|
char buf[INT_STRLEN_MAXIMUM(int) + 1];
|
|
|
|
(void) snprintf(buf, sizeof(buf), format, n);
|
|
return _add(buf, pt, ptlim);
|
|
}
|
|
|
|
static char *
|
|
_add(const char *str, char *pt, const char *ptlim)
|
|
{
|
|
while (pt < ptlim && (*pt = *str++) != '\0')
|
|
++pt;
|
|
return pt;
|
|
}
|
|
|
|
/*
|
|
** POSIX and the C Standard are unclear or inconsistent about
|
|
** what %C and %y do if the year is negative or exceeds 9999.
|
|
** Use the convention that %C concatenated with %y yields the
|
|
** same output as %Y, and that %Y contains at least 4 bytes,
|
|
** with more only if necessary.
|
|
*/
|
|
|
|
static char *
|
|
_yconv(int a, int b, bool convert_top, bool convert_yy,
|
|
char *pt, const char * ptlim)
|
|
{
|
|
int lead;
|
|
int trail;
|
|
|
|
#define DIVISOR 100
|
|
trail = a % DIVISOR + b % DIVISOR;
|
|
lead = a / DIVISOR + b / DIVISOR + trail / DIVISOR;
|
|
trail %= DIVISOR;
|
|
if (trail < 0 && lead > 0) {
|
|
trail += DIVISOR;
|
|
--lead;
|
|
} else if (lead < 0 && trail > 0) {
|
|
trail -= DIVISOR;
|
|
++lead;
|
|
}
|
|
if (convert_top) {
|
|
if (lead == 0 && trail < 0)
|
|
pt = _add("-0", pt, ptlim);
|
|
else pt = _conv(lead, "%02d", pt, ptlim);
|
|
}
|
|
if (convert_yy)
|
|
pt = _conv(((trail < 0) ? -trail : trail), "%02d", pt, ptlim);
|
|
return pt;
|
|
}
|