595 lines
15 KiB
C
595 lines
15 KiB
C
/* $NetBSD: strftime.c,v 1.17 2006/03/22 00:11:28 christos Exp $ */
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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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#else
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__RCSID("$NetBSD: strftime.c,v 1.17 2006/03/22 00:11:28 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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/*
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** Based on the UCB version with the ID appearing below.
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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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/*
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** Copyright (c) 1989, 1993
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** The Regents of the University of California. All rights reserved.
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**
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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. All advertising materials mentioning features or use of this software
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** must display the following acknowledgement:
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** This product includes software developed by the University of
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** California, Berkeley and its contributors.
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** 4. 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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**
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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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*/
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#ifndef LIBC_SCCS
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#ifndef lint
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static const char sccsid[] = "@(#)strftime.c 5.4 (Berkeley) 3/14/89";
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#endif /* !defined lint */
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#endif /* !defined LIBC_SCCS */
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#include "tzfile.h"
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#include "fcntl.h"
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#include "locale.h"
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#include "sys/localedef.h"
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#define Locale _CurrentTimeLocale
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static char * _add P((const char *, char *, const char *));
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static char * _conv P((int, const char *, char *, const char *));
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static char * _fmt P((const char *, const struct tm *, char *, const char *, int *));
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#define NO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU
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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(s, maxsize, format, t)
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char * const s;
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const size_t maxsize;
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const char * const format;
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const struct tm * const t;
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{
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char * p;
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int warn;
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tzset();
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warn = IN_NONE;
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p = _fmt(((format == NULL) ? "%c" : format), t, s, s + maxsize, &warn);
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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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if (format == NULL)
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(void) fprintf(stderr, "NULL strftime format ");
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else (void) fprintf(stderr, "strftime format \"%s\" ",
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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(format, t, pt, ptlim, warnp)
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const char * format;
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const struct tm * const t;
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char * pt;
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const char * const ptlim;
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int * warnp;
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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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"?" : Locale->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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"?" : Locale->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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"?" : Locale->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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"?" : Locale->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 = _conv((t->tm_year + TM_YEAR_BASE) / 100,
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"%02d", 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(Locale->d_t_fmt, t, pt, ptlim, &warn2);
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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("%m/%d/%y", t, pt, ptlim, warnp);
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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("%Y-%m-%d", t, pt, ptlim, warnp);
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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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Locale->am_pm[1] :
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Locale->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("%H:%M", t, pt, ptlim, warnp);
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continue;
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case 'r':
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pt = _fmt("%I:%M:%S %p", t, pt, ptlim, warnp);
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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) sprintf(buf, "%ld",
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(long) mkt);
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else (void) sprintf(buf, "%lu",
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(unsigned long) 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("%H:%M:%S", t, pt, ptlim, warnp);
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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 yday;
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int wday;
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int w;
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year = t->tm_year + 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(year) ?
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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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++year;
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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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--year;
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yday += isleap(year) ?
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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 = _conv(year % 100, "%02d",
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pt, ptlim);
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} else pt = _conv(year, "%04d",
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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("%e-%b-%Y", t, pt, ptlim, warnp);
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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(Locale->t_fmt, t, pt, ptlim, warnp);
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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(Locale->d_fmt, t, pt, ptlim, &warn2);
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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 = _conv((t->tm_year + TM_YEAR_BASE) % 100,
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"%02d", pt, ptlim);
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continue;
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case 'Y':
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pt = _conv(t->tm_year + TM_YEAR_BASE, "%04d",
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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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if (t->TM_ZONE != NULL)
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pt = _add(t->TM_ZONE, pt, ptlim);
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else
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#endif /* defined TM_ZONE */
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if (t->tm_isdst >= 0)
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pt = _add(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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{
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int diff;
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char const * sign;
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if (t->tm_isdst < 0)
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continue;
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#ifdef TM_GMTOFF
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diff = (int)t->TM_GMTOFF;
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#else /* !defined TM_GMTOFF */
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/*
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** C99 says that the UTC offset must
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** be computed by looking only at
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** tm_isdst. This requirement is
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** incorrect, since it means the code
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** must rely on magic (in this case
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** altzone and timezone), and the
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** magic might not have the correct
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** offset. Doing things correctly is
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** tricky and requires disobeying C99;
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** see GNU C strftime for details.
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** For now, punt and conform to the
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** standard, even though it's incorrect.
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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, so output nothing if the
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** appropriate variables are not available.
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*/
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#ifndef STD_INSPIRED
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if (t->tm_isdst == 0)
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#ifdef USG_COMPAT
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diff = -timezone;
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#else /* !defined USG_COMPAT */
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continue;
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#endif /* !defined USG_COMPAT */
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else
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#ifdef ALTZONE
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diff = -altzone;
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#else /* !defined ALTZONE */
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continue;
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#endif /* !defined ALTZONE */
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#else /* defined STD_INSPIRED */
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|
{
|
|
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 /* defined STD_INSPIRED */
|
|
#endif /* !defined TM_GMTOFF */
|
|
if (diff < 0) {
|
|
sign = "-";
|
|
diff = -diff;
|
|
} else sign = "+";
|
|
pt = _add(sign, pt, ptlim);
|
|
diff /= 60;
|
|
pt = _conv((diff/60)*100 + diff%60,
|
|
"%04d", pt, ptlim);
|
|
}
|
|
continue;
|
|
#if 0
|
|
case '+':
|
|
pt = _fmt(Locale->date_fmt, t, pt, ptlim,
|
|
warnp);
|
|
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;
|
|
}
|
|
|
|
static char *
|
|
_conv(n, format, pt, ptlim)
|
|
const int n;
|
|
const char * const format;
|
|
char * const pt;
|
|
const char * const ptlim;
|
|
{
|
|
char buf[INT_STRLEN_MAXIMUM(int) + 1];
|
|
|
|
(void) sprintf(buf, format, n);
|
|
return _add(buf, pt, ptlim);
|
|
}
|
|
|
|
static char *
|
|
_add(str, pt, ptlim)
|
|
const char * str;
|
|
char * pt;
|
|
const char * const ptlim;
|
|
{
|
|
while (pt < ptlim && (*pt = *str++) != '\0')
|
|
++pt;
|
|
return pt;
|
|
}
|