/* rfc822date.c -- Generate an 822 date $Id: rfc822date.c,v 1.5 2005/03/05 00:37:18 dasenbro 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); }