sortix--sortix/libc/time/asctime_r.c

/*
 * Copyright (c) 2013 Jonas 'Sortie' Termansen.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, 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.
 *
 * time/asctime_r.c
 * Convert date and time to a string.
 */

#include <assert.h>
#include <time.h>
#include <stdio.h>

// TODO: Oh god. This function is horrible! It's obsolescent in POSIX - but it's
//       still widely used and I need it at the moment to port software. Please
//       do remove this function when all the calls to it has been purged.
char* asctime_r(const struct tm* tm, char* buf)
{
	static char weekday_names[7][4] =
		{ "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };
	static char month_names[12][4] =
		{ "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct",
		  "Nov", "Dec" };
	sprintf(buf, "%.3s %.3s%3d %.2d:%.2d%.2d %d\n",
	             weekday_names[tm->tm_wday],
	             month_names[tm->tm_mon],
	             tm->tm_mday,
	             tm->tm_hour,
	             tm->tm_min,
	             tm->tm_sec,
	             tm->tm_year + 1900);
	return buf;
}