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/* rfc822date.c -- Generate an 822 date
$Id: rfc822date.c,v 1.6 2003/10/22 18:50:12 rjs3 Exp $
* Copyright (c) 1998-2003 Carnegie Mellon University. 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. The name "Carnegie Mellon University" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For permission or any other legal
* details, please contact
* Office of Technology Transfer
* Carnegie Mellon University
* 5000 Forbes Avenue
* Pittsburgh, PA 15213-3890
* (412) 268-4387, fax: (412) 268-7395
* tech-transfer@andrew.cmu.edu
*
* 4. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by Computing Services
* at Carnegie Mellon University (http://www.cmu.edu/computing/)."
*
* CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
* THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
* FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
*/
#include <stdio.h>
#include "assert.h"
#include "rfc822date.h"
#include "gmtoff.h"
static char *month[] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
static char *wday[] = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };
/* 'buf' must be at least 80 characters */
void rfc822date_gen(char *buf, size_t len, time_t t)
{
struct tm *tm;
long gmtoff;
int gmtnegative = 0;
assert(buf != NULL);
tm = localtime(&t);
gmtoff = gmtoff_of(tm, t);
if (gmtoff < 0) {
gmtoff = -gmtoff;
gmtnegative = 1;
}
gmtoff /= 60;
snprintf(buf, len, "%s, %02d %s %4d %02d:%02d:%02d %c%.2lu%.2lu",
wday[tm->tm_wday],
tm->tm_mday, month[tm->tm_mon], tm->tm_year + 1900,
tm->tm_hour, tm->tm_min, tm->tm_sec,
gmtnegative ? '-' : '+', gmtoff / 60, gmtoff % 60);
}
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