421 lines
10 KiB
C
421 lines
10 KiB
C
/* $NetBSD: strftime.c,v 1.8 1999/02/07 17:33:30 augustss Exp $ */
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/*
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* Copyright (c) 1989 The Regents of the University of California.
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* 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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#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 *sccsid = "@(#)strftime.c 5.11 (Berkeley) 2/24/91";
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#else
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__RCSID("$NetBSD: strftime.c,v 1.8 1999/02/07 17:33:30 augustss 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 <sys/localedef.h>
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#include <locale.h>
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#include <string.h>
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#include <tzfile.h>
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#include <time.h>
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static int _add __P((const char *, char **, const char *));
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static int _conv __P((int, int, int, char **, const char *));
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static int _secs __P((const struct tm *, char **, const char *));
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static size_t _fmt __P((const char *, const struct tm *, char **,
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const char *));
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size_t
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strftime(s, maxsize, format, t)
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char *s;
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size_t maxsize;
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const char *format;
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const struct tm *t;
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{
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char *pt;
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tzset();
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if (maxsize < 1)
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return (0);
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pt = s;
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if (_fmt(format, t, &pt, s + maxsize)) {
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*pt = '\0';
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return (pt - s);
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} else
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return (0);
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}
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#define SUN_WEEK(t) (((t)->tm_yday + 7 - \
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((t)->tm_wday)) / 7)
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#define MON_WEEK(t) (((t)->tm_yday + 7 - \
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((t)->tm_wday ? (t)->tm_wday - 1 : 6)) / 7)
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static size_t
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_fmt(format, t, pt, ptlim)
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const char *format;
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const struct tm *t;
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char **pt;
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const char * const ptlim;
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{
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for (; *format; ++format) {
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if (*format == '%') {
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++format;
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if (*format == 'E') {
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/* Alternate Era */
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++format;
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} else if (*format == 'O') {
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/* Alternate numeric symbols */
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++format;
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}
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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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if (t->tm_wday < 0 || t->tm_wday > 6)
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return (0);
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if (!_add(_CurrentTimeLocale->day[t->tm_wday],
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pt, ptlim))
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return (0);
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continue;
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case 'a':
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if (t->tm_wday < 0 || t->tm_wday > 6)
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return (0);
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if (!_add(_CurrentTimeLocale->abday[t->tm_wday],
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pt, ptlim))
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return (0);
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continue;
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case 'B':
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if (t->tm_mon < 0 || t->tm_mon > 11)
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return (0);
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if (!_add(_CurrentTimeLocale->mon[t->tm_mon],
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pt, ptlim))
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return (0);
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continue;
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case 'b':
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case 'h':
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if (t->tm_mon < 0 || t->tm_mon > 11)
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return (0);
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if (!_add(_CurrentTimeLocale->abmon[t->tm_mon],
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pt, ptlim))
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return (0);
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continue;
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case 'C':
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if (!_conv((t->tm_year + TM_YEAR_BASE) / 100,
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2, '0', pt, ptlim))
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return (0);
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continue;
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case 'c':
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if (!_fmt(_CurrentTimeLocale->d_t_fmt, t, pt,
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ptlim))
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return (0);
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continue;
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case 'D':
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if (!_fmt("%m/%d/%y", t, pt, ptlim))
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return (0);
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continue;
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case 'd':
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if (!_conv(t->tm_mday, 2, '0', pt, ptlim))
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return (0);
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continue;
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case 'e':
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if (!_conv(t->tm_mday, 2, ' ', pt, ptlim))
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return (0);
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continue;
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case 'H':
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if (!_conv(t->tm_hour, 2, '0', pt, ptlim))
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return (0);
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continue;
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case 'I':
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if (!_conv(t->tm_hour % 12 ?
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t->tm_hour % 12 : 12, 2, '0', pt, ptlim))
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return (0);
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continue;
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case 'j':
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if (!_conv(t->tm_yday + 1, 3, '0', pt, ptlim))
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return (0);
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continue;
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case 'k':
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if (!_conv(t->tm_hour, 2, ' ', pt, ptlim))
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return (0);
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continue;
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case 'l':
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if (!_conv(t->tm_hour % 12 ?
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t->tm_hour % 12: 12, 2, ' ', pt, ptlim))
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return (0);
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continue;
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case 'M':
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if (!_conv(t->tm_min, 2, '0', pt, ptlim))
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return (0);
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continue;
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case 'm':
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if (!_conv(t->tm_mon + 1, 2, '0', pt, ptlim))
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return (0);
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continue;
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case 'n':
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if (!_add("\n", pt, ptlim))
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return (0);
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continue;
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case 'p':
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if (!_add(_CurrentTimeLocale->am_pm[t->tm_hour
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>= 12], pt, ptlim))
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return (0);
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continue;
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case 'R':
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if (!_fmt("%H:%M", t, pt, ptlim))
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return (0);
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continue;
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case 'r':
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if (!_fmt(_CurrentTimeLocale->t_fmt_ampm, t, pt,
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ptlim))
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return (0);
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continue;
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case 'S':
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if (!_conv(t->tm_sec, 2, '0', pt, ptlim))
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return (0);
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continue;
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case 's':
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if (!_secs(t, pt, ptlim))
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return (0);
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continue;
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case 'T':
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if (!_fmt("%H:%M:%S", t, pt, ptlim))
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return (0);
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continue;
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case 't':
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if (!_add("\t", pt, ptlim))
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return (0);
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continue;
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case 'U':
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if (!_conv(SUN_WEEK(t), 2, '0', pt, ptlim))
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return (0);
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continue;
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case 'u':
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if (!_conv(t->tm_wday ? t->tm_wday : 7, 1, '0',
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pt, ptlim))
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return (0);
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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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if (!_conv(w, 2, '0',
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pt, ptlim))
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return (0);
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} else if (*format == 'g') {
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if (!_conv(year % 100, 2, '0',
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pt, ptlim))
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return (0);
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} else if (!_conv(year, 4, '0',
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pt, ptlim))
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return (0);
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}
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continue;
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case 'W':
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if (!_conv(MON_WEEK(t), 2, '0', pt, ptlim))
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return (0);
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continue;
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case 'w':
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if (!_conv(t->tm_wday, 1, '0', pt, ptlim))
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return (0);
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continue;
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case 'x':
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if (!_fmt(_CurrentTimeLocale->d_fmt, t, pt,
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ptlim))
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return (0);
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continue;
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case 'X':
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if (!_fmt(_CurrentTimeLocale->t_fmt, t, pt,
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ptlim))
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return (0);
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continue;
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case 'y':
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if (!_conv((t->tm_year + TM_YEAR_BASE) % 100,
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2, '0', pt, ptlim))
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return (0);
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continue;
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case 'Y':
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if (!_conv((t->tm_year + TM_YEAR_BASE), 4, '0',
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pt, ptlim))
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return (0);
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continue;
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case 'Z':
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if (tzname[t->tm_isdst ? 1 : 0] &&
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!_add(tzname[t->tm_isdst ? 1 : 0], pt,
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ptlim))
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return (0);
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continue;
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case '%':
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/*
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* X311J/88-090 (4.12.3.5): if conversion char is
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* undefined, behavior is undefined. Print out the
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* character itself as printf(3) does.
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*/
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default:
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break;
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}
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}
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if (*pt == ptlim)
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return (0);
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*(*pt)++ = *format;
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}
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return (ptlim - *pt);
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}
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static int
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_secs(t, pt, ptlim)
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const struct tm *t;
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char **pt;
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const char * const ptlim;
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{
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char buf[15];
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time_t s;
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char *p;
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struct tm tmp;
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buf[sizeof (buf) - 1] = '\0';
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/* Make a copy, mktime(3) modifies the tm struct. */
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tmp = *t;
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s = mktime(&tmp);
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for (p = buf + sizeof(buf) - 2; s > 0 && p > buf; s /= 10)
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*p-- = (char)(s % 10 + '0');
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return (_add(++p, pt, ptlim));
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}
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static int
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_conv(n, digits, pad, pt, ptlim)
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int n, digits;
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int pad;
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char **pt;
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const char * const ptlim;
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{
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char buf[10];
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char *p;
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buf[sizeof (buf) - 1] = '\0';
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for (p = buf + sizeof(buf) - 2; n > 0 && p > buf; n /= 10, --digits)
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*p-- = n % 10 + '0';
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while (p > buf && digits-- > 0)
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*p-- = pad;
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return (_add(++p, pt, ptlim));
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}
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static int
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_add(str, pt, ptlim)
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const char *str;
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char **pt;
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const char * const ptlim;
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{
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for (;; ++(*pt)) {
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if (*pt == ptlim)
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return (0);
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if ((**pt = *str++) == '\0')
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return (1);
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}
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}
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