freebsd-dev/crypto/heimdal/lib/roken/strftime.c

399 lines
8.3 KiB
C

/*
* Copyright (c) 1999 - 2002 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* 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. Neither the name of KTH 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 KTH AND ITS 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 KTH OR ITS 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. */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "roken.h"
RCSID("$Id: strftime.c,v 1.13 2002/08/20 12:42:37 joda Exp $");
static const char *abb_weekdays[] = {
"Sun",
"Mon",
"Tue",
"Wed",
"Thu",
"Fri",
"Sat",
};
static const char *full_weekdays[] = {
"Sunday",
"Monday",
"Tuesday",
"Wednesday",
"Thursday",
"Friday",
"Saturday",
};
static const char *abb_month[] = {
"Jan",
"Feb",
"Mar",
"Apr",
"May",
"Jun",
"Jul",
"Aug",
"Sep",
"Oct",
"Nov",
"Dec"
};
static const char *full_month[] = {
"January",
"February",
"Mars",
"April",
"May",
"June",
"July",
"August",
"September",
"October",
"November",
"December"
};
static const char *ampm[] = {
"AM",
"PM"
};
/*
* Convert hour in [0, 24] to [12 1 - 11 12 1 - 11 12]
*/
static int
hour_24to12 (int hour)
{
int ret = hour % 12;
if (ret == 0)
ret = 12;
return ret;
}
/*
* Return AM or PM for `hour'
*/
static const char *
hour_to_ampm (int hour)
{
return ampm[hour / 12];
}
/*
* Return the week number of `tm' (Sunday being the first day of the week)
* as [0, 53]
*/
static int
week_number_sun (const struct tm *tm)
{
return (tm->tm_yday + 7 - (tm->tm_yday % 7 - tm->tm_wday + 7) % 7) / 7;
}
/*
* Return the week number of `tm' (Monday being the first day of the week)
* as [0, 53]
*/
static int
week_number_mon (const struct tm *tm)
{
int wday = (tm->tm_wday + 6) % 7;
return (tm->tm_yday + 7 - (tm->tm_yday % 7 - wday + 7) % 7) / 7;
}
/*
* Return the week number of `tm' (Monday being the first day of the
* week) as [01, 53]. Week number one is the one that has four or more
* days in that year.
*/
static int
week_number_mon4 (const struct tm *tm)
{
int wday = (tm->tm_wday + 6) % 7;
int w1day = (wday - tm->tm_yday % 7 + 7) % 7;
int ret;
ret = (tm->tm_yday + w1day) / 7;
if (w1day >= 4)
--ret;
if (ret == -1)
ret = 53;
else
++ret;
return ret;
}
/*
*
*/
size_t
strftime (char *buf, size_t maxsize, const char *format,
const struct tm *tm)
{
size_t n = 0;
int ret;
while (*format != '\0' && n < maxsize) {
if (*format == '%') {
++format;
if(*format == 'E' || *format == 'O')
++format;
switch (*format) {
case 'a' :
ret = snprintf (buf, maxsize - n,
"%s", abb_weekdays[tm->tm_wday]);
break;
case 'A' :
ret = snprintf (buf, maxsize - n,
"%s", full_weekdays[tm->tm_wday]);
break;
case 'h' :
case 'b' :
ret = snprintf (buf, maxsize - n,
"%s", abb_month[tm->tm_mon]);
break;
case 'B' :
ret = snprintf (buf, maxsize - n,
"%s", full_month[tm->tm_mon]);
break;
case 'c' :
ret = snprintf (buf, maxsize - n,
"%d:%02d:%02d %02d:%02d:%02d",
tm->tm_year,
tm->tm_mon + 1,
tm->tm_mday,
tm->tm_hour,
tm->tm_min,
tm->tm_sec);
break;
case 'C' :
ret = snprintf (buf, maxsize - n,
"%02d", (tm->tm_year + 1900) / 100);
break;
case 'd' :
ret = snprintf (buf, maxsize - n,
"%02d", tm->tm_mday);
break;
case 'D' :
ret = snprintf (buf, maxsize - n,
"%02d/%02d/%02d",
tm->tm_mon + 1,
tm->tm_mday,
(tm->tm_year + 1900) % 100);
break;
case 'e' :
ret = snprintf (buf, maxsize - n,
"%2d", tm->tm_mday);
break;
case 'F':
ret = snprintf (buf, maxsize - n,
"%04d-%02d-%02d", tm->tm_year + 1900,
tm->tm_mon + 1, tm->tm_mday);
break;
case 'g':
/* last two digits of week-based year */
abort();
case 'G':
/* week-based year */
abort();
case 'H' :
ret = snprintf (buf, maxsize - n,
"%02d", tm->tm_hour);
break;
case 'I' :
ret = snprintf (buf, maxsize - n,
"%02d",
hour_24to12 (tm->tm_hour));
break;
case 'j' :
ret = snprintf (buf, maxsize - n,
"%03d", tm->tm_yday + 1);
break;
case 'k' :
ret = snprintf (buf, maxsize - n,
"%2d", tm->tm_hour);
break;
case 'l' :
ret = snprintf (buf, maxsize - n,
"%2d",
hour_24to12 (tm->tm_hour));
break;
case 'm' :
ret = snprintf (buf, maxsize - n,
"%02d", tm->tm_mon + 1);
break;
case 'M' :
ret = snprintf (buf, maxsize - n,
"%02d", tm->tm_min);
break;
case 'n' :
ret = snprintf (buf, maxsize - n, "\n");
break;
case 'p' :
ret = snprintf (buf, maxsize - n, "%s",
hour_to_ampm (tm->tm_hour));
break;
case 'r' :
ret = snprintf (buf, maxsize - n,
"%02d:%02d:%02d %s",
hour_24to12 (tm->tm_hour),
tm->tm_min,
tm->tm_sec,
hour_to_ampm (tm->tm_hour));
break;
case 'R' :
ret = snprintf (buf, maxsize - n,
"%02d:%02d",
tm->tm_hour,
tm->tm_min);
case 's' :
ret = snprintf (buf, maxsize - n,
"%d", (int)mktime((struct tm *)tm));
break;
case 'S' :
ret = snprintf (buf, maxsize - n,
"%02d", tm->tm_sec);
break;
case 't' :
ret = snprintf (buf, maxsize - n, "\t");
break;
case 'T' :
case 'X' :
ret = snprintf (buf, maxsize - n,
"%02d:%02d:%02d",
tm->tm_hour,
tm->tm_min,
tm->tm_sec);
break;
case 'u' :
ret = snprintf (buf, maxsize - n,
"%d", (tm->tm_wday == 0) ? 7 : tm->tm_wday);
break;
case 'U' :
ret = snprintf (buf, maxsize - n,
"%02d", week_number_sun (tm));
break;
case 'V' :
ret = snprintf (buf, maxsize - n,
"%02d", week_number_mon4 (tm));
break;
case 'w' :
ret = snprintf (buf, maxsize - n,
"%d", tm->tm_wday);
break;
case 'W' :
ret = snprintf (buf, maxsize - n,
"%02d", week_number_mon (tm));
break;
case 'x' :
ret = snprintf (buf, maxsize - n,
"%d:%02d:%02d",
tm->tm_year,
tm->tm_mon + 1,
tm->tm_mday);
break;
case 'y' :
ret = snprintf (buf, maxsize - n,
"%02d", (tm->tm_year + 1900) % 100);
break;
case 'Y' :
ret = snprintf (buf, maxsize - n,
"%d", tm->tm_year + 1900);
break;
case 'z':
ret = snprintf (buf, maxsize - n,
"%ld",
#if defined(HAVE_STRUCT_TM_TM_GMTOFF)
(long)tm->tm_gmtoff
#elif defined(HAVE_TIMEZONE)
#ifdef HAVE_ALTZONE
tm->tm_isdst ?
(long)altzone :
#endif
(long)timezone
#else
#error Where in timezone chaos are you?
#endif
);
break;
case 'Z' :
ret = snprintf (buf, maxsize - n,
"%s",
#if defined(HAVE_STRUCT_TM_TM_ZONE)
tm->tm_zone
#elif defined(HAVE_TIMEZONE)
tzname[tm->tm_isdst]
#else
#error what?
#endif
);
break;
case '\0' :
--format;
/* FALLTHROUGH */
case '%' :
ret = snprintf (buf, maxsize - n,
"%%");
break;
default :
ret = snprintf (buf, maxsize - n,
"%%%c", *format);
break;
}
if (ret < 0 || ret >= maxsize - n)
return 0;
n += ret;
buf += ret;
++format;
} else {
*buf++ = *format++;
++n;
}
}
*buf++ = '\0';
return n;
}