archie/tcl7.6/compat/strftime.c
2024-05-27 16:40:40 +02:00

383 lines
9.1 KiB
C

/*
* strftime.c --
*
* This file contains a modified version of the BSD 4.4 strftime
* function.
*
* This file is a modified version of the strftime.c file from the BSD 4.4
* source. See the copyright notice below for details on redistribution
* restrictions. The "license.terms" file does not apply to this file.
*
* SCCS: @(#) strftime.c 1.3 96/09/12 14:52:02
*/
/*
* Copyright (c) 1989 The Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#if defined(LIBC_SCCS) && !defined(lint)
/*static char *sccsid = "from: @(#)strftime.c 5.11 (Berkeley) 2/24/91";*/
static char *rcsid = "$Id: strftime.c,v 1.10.4.1 1996/06/01 22:00:41 jtc Exp $";
#endif /* LIBC_SCCS and not lint */
#include <time.h>
#include <string.h>
#include <locale.h>
#include "tclInt.h"
#define TM_YEAR_BASE 1900
typedef struct {
const char *abday[7];
const char *day[7];
const char *abmon[12];
const char *mon[12];
const char *am_pm[2];
const char *d_t_fmt;
const char *d_fmt;
const char *t_fmt;
const char *t_fmt_ampm;
} _TimeLocale;
static const _TimeLocale _DefaultTimeLocale =
{
{
"Sun","Mon","Tue","Wed","Thu","Fri","Sat",
},
{
"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday",
"Friday", "Saturday"
},
{
"Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
},
{
"January", "February", "March", "April", "May", "June", "July",
"August", "September", "October", "November", "December"
},
{
"AM", "PM"
},
"%a %b %d %H:%M:%S %Y",
"%m/%d/%y",
"%H:%M:%S",
"%I:%M:%S %p"
};
static const _TimeLocale *_CurrentTimeLocale = &_DefaultTimeLocale;
static size_t gsize;
static char *pt;
static int _add _ANSI_ARGS_((const char* str));
static int _conv _ANSI_ARGS_((int n, int digits, int pad));
static int _secs _ANSI_ARGS_((const struct tm *t));
static size_t _fmt _ANSI_ARGS_((const char *format,
const struct tm *t));
size_t
TclStrftime(s, maxsize, format, t)
char *s;
size_t maxsize;
const char *format;
const struct tm *t;
{
tzset();
pt = s;
if ((gsize = maxsize) < 1)
return(0);
if (_fmt(format, t)) {
*pt = '\0';
return(maxsize - gsize);
}
return(0);
}
#define SUN_WEEK(t) (((t)->tm_yday + 7 - \
((t)->tm_wday)) / 7)
#define MON_WEEK(t) (((t)->tm_yday + 7 - \
((t)->tm_wday ? (t)->tm_wday - 1 : 6)) / 7)
static size_t
_fmt(format, t)
const char *format;
const struct tm *t;
{
for (; *format; ++format) {
if (*format == '%') {
++format;
if (*format == 'E') {
/* Alternate Era */
++format;
} else if (*format == 'O') {
/* Alternate numeric symbols */
++format;
}
switch(*format) {
case '\0':
--format;
break;
case 'A':
if (t->tm_wday < 0 || t->tm_wday > 6)
return(0);
if (!_add(_CurrentTimeLocale->day[t->tm_wday]))
return(0);
continue;
case 'a':
if (t->tm_wday < 0 || t->tm_wday > 6)
return(0);
if (!_add(_CurrentTimeLocale->abday[t->tm_wday]))
return(0);
continue;
case 'B':
if (t->tm_mon < 0 || t->tm_mon > 11)
return(0);
if (!_add(_CurrentTimeLocale->mon[t->tm_mon]))
return(0);
continue;
case 'b':
case 'h':
if (t->tm_mon < 0 || t->tm_mon > 11)
return(0);
if (!_add(_CurrentTimeLocale->abmon[t->tm_mon]))
return(0);
continue;
case 'C':
if (!_conv((t->tm_year + TM_YEAR_BASE) / 100,
2, '0'))
return(0);
continue;
case 'c':
if (!_fmt(_CurrentTimeLocale->d_t_fmt, t))
return(0);
continue;
case 'D':
if (!_fmt("%m/%d/%y", t))
return(0);
continue;
case 'd':
if (!_conv(t->tm_mday, 2, '0'))
return(0);
continue;
case 'e':
if (!_conv(t->tm_mday, 2, ' '))
return(0);
continue;
case 'H':
if (!_conv(t->tm_hour, 2, '0'))
return(0);
continue;
case 'I':
if (!_conv(t->tm_hour % 12 ?
t->tm_hour % 12 : 12, 2, '0'))
return(0);
continue;
case 'j':
if (!_conv(t->tm_yday + 1, 3, '0'))
return(0);
continue;
case 'k':
if (!_conv(t->tm_hour, 2, ' '))
return(0);
continue;
case 'l':
if (!_conv(t->tm_hour % 12 ?
t->tm_hour % 12: 12, 2, ' '))
return(0);
continue;
case 'M':
if (!_conv(t->tm_min, 2, '0'))
return(0);
continue;
case 'm':
if (!_conv(t->tm_mon + 1, 2, '0'))
return(0);
continue;
case 'n':
if (!_add("\n"))
return(0);
continue;
case 'p':
if (!_add(_CurrentTimeLocale->am_pm[t->tm_hour >= 12]))
return(0);
continue;
case 'R':
if (!_fmt("%H:%M", t))
return(0);
continue;
case 'r':
if (!_fmt(_CurrentTimeLocale->t_fmt_ampm, t))
return(0);
continue;
case 'S':
if (!_conv(t->tm_sec, 2, '0'))
return(0);
continue;
case 's':
if (!_secs(t))
return(0);
continue;
case 'T':
if (!_fmt("%H:%M:%S", t))
return(0);
continue;
case 't':
if (!_add("\t"))
return(0);
continue;
case 'U':
if (!_conv(SUN_WEEK(t), 2, '0'))
return(0);
continue;
case 'u':
if (!_conv(t->tm_wday ? t->tm_wday : 7, 1, '0'))
return(0);
continue;
case 'V':
{
/* ISO 8601 Week Of Year:
If the week (Monday - Sunday) containing
January 1 has four or more days in the new
year, then it is week 1; otherwise it is
week 53 of the previous year and the next
week is week one. */
int week = MON_WEEK(t);
int days = (((t)->tm_yday + 7 - \
((t)->tm_wday ? (t)->tm_wday - 1 : 6)) % 7);
if (days >= 4) {
week++;
} else if (week == 0) {
week = 53;
}
if (!_conv(week, 2, '0'))
return(0);
continue;
}
case 'W':
if (!_conv(MON_WEEK(t), 2, '0'))
return(0);
continue;
case 'w':
if (!_conv(t->tm_wday, 1, '0'))
return(0);
continue;
case 'x':
if (!_fmt(_CurrentTimeLocale->d_fmt, t))
return(0);
continue;
case 'X':
if (!_fmt(_CurrentTimeLocale->t_fmt, t))
return(0);
continue;
case 'y':
if (!_conv((t->tm_year + TM_YEAR_BASE) % 100,
2, '0'))
return(0);
continue;
case 'Y':
if (!_conv((t->tm_year + TM_YEAR_BASE), 4, '0'))
return(0);
continue;
case 'Z': {
char *name = TclpGetTZName();
if (name && !_add(name)) {
return 0;
}
continue;
}
case '%':
/*
* X311J/88-090 (4.12.3.5): if conversion char is
* undefined, behavior is undefined. Print out the
* character itself as printf(3) does.
*/
default:
break;
}
}
if (!gsize--)
return(0);
*pt++ = *format;
}
return(gsize);
}
static int
_secs(t)
const struct tm *t;
{
static char buf[15];
register time_t s;
register char *p;
struct tm tmp;
/* Make a copy, mktime(3) modifies the tm struct. */
tmp = *t;
s = mktime(&tmp);
for (p = buf + sizeof(buf) - 2; s > 0 && p > buf; s /= 10)
*p-- = (char)(s % 10 + '0');
return(_add(++p));
}
static int
_conv(n, digits, pad)
int n, digits;
int pad;
{
static char buf[10];
register char *p;
for (p = buf + sizeof(buf) - 2; n > 0 && p > buf; n /= 10, --digits)
*p-- = (char)(n % 10 + '0');
while (p > buf && digits-- > 0)
*p-- = (char) pad;
return(_add(++p));
}
static int
_add(str)
const char *str;
{
for (;; ++pt, --gsize) {
if (!gsize)
return(0);
if (!(*pt = *str++))
return(1);
}
}