/*******************************************************************************

    Copyright(C) Jonas 'Sortie' Termansen 2013.

    This file is part of the Sortix C Library.

    The Sortix C Library is free software: you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as published by
    the Free Software Foundation, either version 3 of the License, or (at your
    option) any later version.

    The Sortix C Library 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 Lesser General Public
    License for more details.

    You should have received a copy of the GNU Lesser General Public License
    along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.

    time/asctime_r.cpp
    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.
extern "C" char* asctime_r(const struct tm* tm, char* buf)
{
	static char wday_names[7][4] =
	{
		"Sun",
		"Mon",
		"Tue",
		"Wed",
		"Thu",
		"Fri",
		"Sat"
	};
	static char mon_names[12][4] =
	{
		"Jan",
		"Feb",
		"Mar",
		"Apr",
		"May",
		"Jun",
		"Jul",
		"Aug",
		"Sep",
		"Oct",
		"Nov",
		"Dec",
	};

	// TODO: This is not exactly the same as in POSIX because printf currently
	//       doesn't support precision ('.'), only field width.
	int bytes = sprintf(buf, "%s %s%3d %02d:%02d%02d %d\n",
	                    wday_names[tm->tm_wday],
	                    mon_names[tm->tm_mon],
	                    tm->tm_mday,
	                    tm->tm_hour,
	                    tm->tm_min,
	                    tm->tm_sec,
	                    tm->tm_year + 1900);
	assert(bytes+1 <= 26);
	return buf;
}