/*
* aegis - project change supervisor
* Copyright (C) 1994, 1996 Peter Miller;
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
*
* MANIFEST: impliment missing functions from <time.h>
*/
#include <ac/time.h>
/*
* NAME
* strftime - string from time
*
* SYNOPSIS
* size_t strftime(char *s, size_t maxsize, const char *format,
* const struct tm *timeptr);
*
* DESCRIPTION
* The strftime function places characters into the array pointed to
* by s as controlled by the string pointed to by format. The format
* string consists of zero or more directives and ordinary characters.
* A directive consists of a % character followed by a character that
* determined the dirrective's behaviour. All ordinary characters
* (including the terminating null character) are copied unchanged
* into the array. No more thaqn maxsize characters are placed into
* the array. Each directive is replaced by appropriate characters as
* described in the following list. The appropriate characters are
* determined by the program's locale and by the values contained in
* the structure pointed to by timeptr.
*
* %a is replaced by the locale's abbreviated weekday name
* %A is replaced by the locale's full weekday name
* %b is replaced by the locale's abbreviated month name
* %B is replaced by the locale's full month name
* %c is replaced by the locale's appropriae date and time representation
* %d is replaced by the day of the month as decimal number (01-31)
* %H is replaced by the hour (24-hour clock) as decimal number (00-23)
* %I is replaced by the hour (12-hour clock) as decimal number (01-12)
* %j is replaced by the day of te year as decimal number (001-366)
* %m is replaced by the month as decomal number (01-12)
* %M is replaced by the minute as decimal number (00-59)
* %p is replaced by the locale's equivalent of either AM or PM
* %S is replaced by the second as decimal number (00-59)
* %U is replaced by the week number of they year (Sunday as the first
* day of the week) as decimal number (00-52)
* %w is replaced by the weekday as decimal number (0=Sunday to 6=Saturday)
* %W is replaced by the week number of the year (Monday as the first
* day of the week) as decimal number (00-52)
* %x is replaced by the locale's appropriate date representation
* %X is replaced by the locale's appropriate time representation
* %y is replaced by the year without century as decimal number (00-99)
* %Y is replaced by the year with century as decimal number
* %Z is replaced by the time zone name, or no characters in no time
* zone name is available
* %% is replaced by %
*
* RETURNS
* If the total number of resulting characters including the terminating
* null character is not more than maxsize, the strftime function returns
* the number of characters placed into the array pointed to by s not
* including the terminating null character. Otherwise, zero is returned
* and the contents of the array are indeterminate.
*
* CAVEAT
* This suffers from a serious design flaw: there is no way to
* distinguish between a result which is the empty string, and a result
* which is more than maxsize characters.
*
* The behaviour for unknow directivbes is not only undefined,
* it is unmentioned! (Normally the standard specifically allows
* implementation defined behaviour on weird boundary conditions.)
* This implementation will echo unknown directives into the output.
*/
#ifndef HAVE_STRFTIME
#ifndef HAVE_tm_zone
extern char *tzname[2];
#endif
size_t
strftime(buf, max, fmt, tm)
char *buf;
size_t max;
char *fmt;
struct tm *tm;
{
char *cp;
char *end;
char output[1000];
int n;
size_t len;
static char *weekday[] =
{
"Sunday",
"Monday",
"Tuesday",
"Wednesday",
"Thursday",
"Friday",
"Saturday",
};
static char *month[] =
{
"January",
"February",
"March",
"April",
"May",
"June",
"July",
"August",
"September",
"October",
"November",
"December",
};
end = buf + max - 1;
cp = buf;
while (*fmt)
{
if (*fmt++ != '%')
{
if (cp >= end)
return 0;
*cp++ = fmt[-1];
continue;
}
switch (*fmt++)
{
case 0:
--fmt;
output[0] = '%';
output[1] = 0;
break;
default:
output[0] = '%';
output[1] = fmt[-1];
output[2] = 0;
break;
case '%':
output[0] = '%';
output[1] = 0;
break;
case 'a':
/*
* the abbreviated weekday name
*/
sprintf(output, "%3.3s", weekday[tm->tm_wday]);
break;
case 'A':
/*
* the full weekday name
*/
strcpy(output, weekday[tm->tm_wday]);
break;
case 'b':
case 'h':
/*
* the abbreviated month name
*/
sprintf(output, "%3.3s", month[tm->tm_mon]);
break;
case 'B':
/*
* the full month name
*/
strcpy(output, month[tm->tm_mon]);
break;
case 'c':
/*
* the date and time
*/
len = strftime(output, sizeof(output), "%b %e %X %Y", tm);
if (!len)
output[0] = 0;
break;
case 'C':
/*
* This looks like a Sun extra.
* Local date.
*/
len = strftime(output, sizeof(output), "%A, %B %e, %Y", tm);
if (!len)
output[0] = 0;
break;
case 'd':
/*
* the day of the month,
* zero padded.
*/
sprintf(output, "%2.2d", tm->tm_mday);
break;
case 'D':
/*
* This looks like a Sun extra.
* Local date.
*/
len = strftime(output, sizeof(output), "%m/%d/%y", tm);
if (!len)
output[0] = 0;
break;
case 'e':
/*
* This looks like a Sun extra.
* the day of the month,
* blank padded.
*/
sprintf(output, "%2d", tm->tm_mday);
break;
case 'H':
/*
* the hour of a 24-hour day
* zero padded
*/
sprintf(output, "%2.2d", tm->tm_hour);
break;
case 'I':
/*
* the hour of a 12-hour day,
* zero padded
*/
n = tm->tm_hour % 12;
sprintf(output, "%2.2d", n ? n : 12);
break;
case 'j':
/*
* the day of the year,
* zero padded, one based
*/
sprintf(output, "%3.3d", tm->tm_yday + 1);
break;
case 'k':
/*
* This looks like a Sun extra.
* the hour of the 24-hour day,
* blank padded.
*/
sprintf(output, "%2d", tm->tm_hour);
break;
case 'l':
/*
* This looks like a Sun extra.
* the hour of the 12-hour day,
* blank padded.
*/
n = tm->tm_hour % 12;
sprintf(output, "%2d", n ? n : 12);
break;
case 'm':
/*
* the month of the year,
* zero padded, one based.
*/
sprintf(output, "%2.2d", tm->tm_mon + 1);
break;
case 'M':
/*
* the minute of the hour,
* zero padded
*/
sprintf(output, "%2.2d", tm->tm_min);
break;
case 'n':
/*
* This looks like a Sun extra.
* like \n
*/
output[0] = '\n';
output[1] = 0;
break;
case 'p':
/*
* meridian indicator
*/
if (tm->tm_hour >= 12)
strcpy(output, "PM");
else
strcpy(output, "AM");
break;
case 'r':
/*
* this looks like a Sun extra.
* like %X, but 12-hour clock with meridian.
*/
len = strftime(output, sizeof(output), "%I:%M:%S %p", tm);
if (!len)
output[0] = 0;
break;
case 'R':
/*
* this looks like a Sun extra.
* the 24-hour time as HH:MM
*/
len = strftime(output, sizeof(output), "%H:%M", tm);
if (!len)
output[0] = 0;
break;
case 'S':
/*
* seconds of the minute
*/
sprintf(output, "%2.2d", tm->tm_sec);
break;
case 't':
/*
* this looks like a Sun extra.
* like \t
*/
output[0] = '\t';
output[1] = 0;
break;
case 'T':
/*
* This looks like a Sun extra.
* the 24-hour time as HH:MM:SS
*/
len = strftime(output, sizeof(output), "%H:%M:%S", tm);
if (!len)
output[0] = 0;
break;
case 'U':
/*
* the Sunday week of the year
*/
n = (tm->tm_yday - tm->tm_wday + 5) / 7;
sprintf(output, "%2.2d", n);
break;
case 'w':
/*
* the day of the week,
* Sunday = 0
*/
sprintf(output, "%d", tm->tm_wday);
break;
case 'W':
/*
* the Monday week of the year
*/
n = (tm->tm_yday - ((tm->tm_wday + 6) % 7) + 5) / 7;
sprintf(output, "%2.2d", n);
break;
case 'x':
/*
* the date, as mmm dd yyyy
*/
len = strftime(output, sizeof(output), "%b %d %Y", tm);
if (!len)
output[0] = 0;
break;
case 'X':
/*
* the time as hh:mm:ss
*/
len = strftime(output, sizeof(output), "%H:%M:%S", tm);
if (!len)
output[0] = 0;
break;
case 'y':
/*
* the year of the century
*/
sprintf(output, "%2.2d", tm->tm_year % 100);
break;
case 'Y':
/*
* the year including century
*/
sprintf(output, "%4.4d", tm->tm_year + 1900);
break;
case 'Z':
/*
* the timezone name, if any
*/
#ifndef HAVE_tm_zone
if (tm->tm_isdst >= 0 && tm->tm_isdst <= 1)
strcpy(output, tzname[tm->tm_isdst]);
else
output[0] = 0;
#else
/* Berkeley derivatives have extra tm field */
strcpy(output, tm->tm_zone);
#endif
break;
}
/*
* make sure it fits in the buffer
*/
len = strlen(output);
if (cp + len > end)
return -1;
memcpy(cp, output, len);
cp += len;
}
*cp = 0;
return (cp - buf);
}
#endif /* !HAVE_STRFTIME */