338 lines
7.8 KiB
C
338 lines
7.8 KiB
C
/*
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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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#if defined(LIBC_SCCS) && !defined(lint)
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/*static char *sccsid = "from: @(#)strftime.c 5.11 (Berkeley) 2/24/91";*/
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static char *rcsid = "$Id: strftime.c,v 1.4 1993/08/26 00:51:52 jtc Exp $";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/types.h>
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#include <sys/time.h>
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#include <tzfile.h>
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#include <string.h>
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static char *abday[] = {
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"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat",
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};
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static char *day[] = {
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"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday",
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"Saturday",
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};
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static char *abmon[] = {
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"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep",
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"Oct", "Nov", "Dec",
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};
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static char *mon[] = {
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"January", "February", "March", "April", "May", "June", "July",
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"August", "September", "October", "November", "December",
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};
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static char *ampm[] = {
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"AM", "PM",
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};
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static const char *d_t_fmt = "%a %b %e %H:%M:%S %Y";
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static const char *d_fmt = "%m/%d/%y";
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static const char *t_fmt = "%H:%M:%S";
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static const char *t_fmt_ampm = "%I:%M:%S %p";
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static size_t gsize;
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static char *pt;
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static int _add(), _conv(), _secs();
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static size_t _fmt();
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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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pt = s;
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if ((gsize = maxsize) < 1)
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return(0);
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if (_fmt(format, t)) {
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*pt = '\0';
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return(maxsize - gsize);
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}
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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)
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register char *format;
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struct tm *t;
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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(day[t->tm_wday]))
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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(abday[t->tm_wday]))
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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(mon[t->tm_mon]))
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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(abmon[t->tm_mon]))
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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'))
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return(0);
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continue;
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case 'c':
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if (!_fmt(d_t_fmt, t))
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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))
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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'))
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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, ' '))
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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'))
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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'))
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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'))
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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, ' '))
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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, ' '))
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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'))
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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'))
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return(0);
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continue;
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case 'n':
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if (!_add("\n"))
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return(0);
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continue;
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case 'p':
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if (!_add(ampm[t->tm_hour >= 12]))
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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))
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return(0);
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case 'r':
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if (!_fmt(t_fmt_ampm, t))
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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'))
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return(0);
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continue;
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case 's':
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if (!_secs(t))
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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))
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return(0);
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continue;
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case 't':
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if (!_add("\t"))
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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'))
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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, 2, '0'))
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return(0);
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continue;
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case 'V':
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{
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/* ISO 8601 Week Of Year:
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If the week (Monday - Sunday) containing
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January 1 has four or more days in the new
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year, then it is week 1; otherwise it is
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week 53 of the previous year and the next
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week is week one. */
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int week = MON_WEEK(t);
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if (((t->tm_yday + 7 - (t->tm_wday + 1)) % 7) >= 4) {
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week++;
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} else if (week == 0) {
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week = 53;
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}
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if (!_conv(week, 2, '0'))
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return(0);
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continue;
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}
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case 'W':
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if (!_conv(MON_WEEK(t), 2, '0'))
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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'))
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return(0);
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continue;
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case 'x':
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if (!_fmt(d_fmt, t))
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return(0);
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continue;
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case 'X':
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if (!_fmt(t_fmt, t))
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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'))
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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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return(0);
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continue;
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case 'Z':
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if (t->tm_zone && !_add(t->tm_zone))
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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 (!gsize--)
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return(0);
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*pt++ = *format;
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}
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return(gsize);
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}
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static
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_secs(t)
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struct tm *t;
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{
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static char buf[15];
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register time_t s;
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register char *p;
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struct tm tmp;
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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-- = s % 10 + '0';
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return(_add(++p));
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}
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static
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_conv(n, digits, pad)
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int n, digits;
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char pad;
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{
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static char buf[10];
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register char *p;
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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));
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}
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static
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_add(str)
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register char *str;
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{
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for (;; ++pt, --gsize) {
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if (!gsize)
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return(0);
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if (!(*pt = *str++))
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return(1);
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}
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}
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