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version 3.7

/*************************************************************************
* (C) 2013 AITNET ltd - Sofia/Bulgaria - <misho@aitnet.org>
*  by Michael Pounov <misho@elwix.org>
*
* $Author: misho $
* $Id: time.c,v 1.5 2015/06/25 17:53:50 misho Exp $
*
**************************************************************************
The ELWIX and AITNET software is distributed under the following
terms:

All of the documentation and software included in the ELWIX and AITNET
Releases is copyrighted by ELWIX - Sofia/Bulgaria <info@elwix.org>

Copyright 2004 - 2015
	by Michael Pounov <misho@elwix.org>.  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. All advertising materials mentioning features or use of this software
   must display the following acknowledgement:
This product includes software developed by Michael Pounov <misho@elwix.org>
ELWIX - Embedded LightWeight unIX and its contributors.
4. Neither the name of AITNET nor the names of its contributors
   may be used to endorse or promote products derived from this software
   without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY AITNET AND CONTRIBUTORS ``AS IS'' AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
*/
#include "global.h"


struct stridx {
	char	*str;
	int	id;
};

static struct stridx months[] = {
	{ "jan", 0 }, { "january", 0 },
	{ "feb", 1 }, { "february", 1 },
	{ "mar", 2 }, { "march", 2 },
	{ "apr", 3 }, { "april", 3 },
	{ "may", 4 },
	{ "jun", 5 }, { "june", 5 },
	{ "jul", 6 }, { "july", 6 },
	{ "aug", 7 }, { "august", 7 },
	{ "sep", 8 }, { "september", 8 },
	{ "oct", 9 }, { "october", 9 },
	{ "nov", 10 }, { "november", 10 },
	{ "dec", 11 }, { "december", 11 },
};

static struct stridx wdays[] = {
	{ "sun", 0 }, { "sunday", 0 },
	{ "mon", 1 }, { "monday", 1 },
	{ "tue", 2 }, { "tuesday", 2 },
	{ "wed", 3 }, { "wednesday", 3 },
	{ "thu", 4 }, { "thursday", 4 },
	{ "fri", 5 }, { "friday", 5 },
	{ "sat", 6 }, { "saturday", 6 },
};

static int
stridx_compare(struct stridx * __restrict a, struct stridx * __restrict b)
{
	return strcmp(a->str, b->str);
}

static int
search4month(char * psMonth, int * __restrict id)
{
	static int sorted = 0;
	struct stridx *el, item = { psMonth, 0 };

	if (!psMonth)
		return -1;

	if (!sorted) {
		qsort(months, sizeof(months) / sizeof(struct stridx), sizeof(struct stridx), 
				(int (*)(const void*, const void*)) stridx_compare);
		sorted++;
	}

	str_Lower(psMonth);
	el = bsearch(&item, months, sizeof(months) / sizeof(struct stridx), sizeof(struct stridx), 
				(int (*)(const void*, const void*)) stridx_compare);
	if (el && id)
		*id = el->id;

	return !!el;
}

static int
search4wday(char * __restrict psWDay, int * __restrict id)
{
	static int sorted = 0;
	struct stridx *el, item = { psWDay, 0 };

	if (!psWDay)
		return -1;

	if (!sorted) {
		qsort(wdays, sizeof(wdays) / sizeof(struct stridx), sizeof(struct stridx), 
				(int (*)(const void*, const void*)) stridx_compare);
		sorted++;
	}

	str_Lower(psWDay);
	el = bsearch(&item, wdays, sizeof(wdays) / sizeof(struct stridx), sizeof(struct stridx), 
				(int (*)(const void*, const void*)) stridx_compare);
	if (el && id)
		*id = el->id;

	return !!el;
}


/*
 * time_Parse() - Parse and make unix time from standart time strings ...
 *
 * @csTime = Time string
 * return: =-1 error or !=-1 converted time 
 */
time_t
time_Parse(const char *csTime)
{
	struct tm tm;
	char *s;
	int tm_sec, tm_min, tm_hour, tm_mday, tm_year, tm_mon, tm_wday;
	char str_mon[512], str_wday[512];
	time_t tim;

	memset(&tm, 0, sizeof tm);
	memset(&str_mon, 0, sizeof str_mon);
	memset(&str_wday, 0, sizeof str_wday);

	for (s = (char*) csTime; isspace(*s); s++);

	/*
	 * And do the sscanfs.  WARNING: you can add more formats here,
	 * but be careful!  You can easily screw up the parsing of existing
	 * formats when you add new ones.  The order is important.
	 */

	/* DD-mth-YY HH:MM:SS GMT */
	if (sscanf(s, "%d-%400[a-zA-Z]-%d %d:%d:%d GMT", 
				&tm_mday, str_mon, &tm_year, 
				&tm_hour, &tm_min, &tm_sec) == 6 && 
			search4month(str_mon, &tm_mon)) {
		tm.tm_mday = tm_mday;
		tm.tm_mon = tm_mon;
		tm.tm_year = tm_year;
		tm.tm_hour = tm_hour;
		tm.tm_min = tm_min;
		tm.tm_sec = tm_sec;
	}
	/* DD mth YY HH:MM:SS GMT */
	else if (sscanf(s, "%d %400[a-zA-Z] %d %d:%d:%d GMT", 
				&tm_mday, str_mon, &tm_year, 
				&tm_hour, &tm_min, &tm_sec) == 6 && 
			search4month(str_mon, &tm_mon)) {
		tm.tm_mday = tm_mday;
		tm.tm_mon = tm_mon;
		tm.tm_year = tm_year;
		tm.tm_hour = tm_hour;
		tm.tm_min = tm_min;
		tm.tm_sec = tm_sec;
	}
	/* HH:MM:SS GMT DD-mth-YY */
	else if (sscanf(s, "%d:%d:%d GMT %d-%400[a-zA-Z]-%d", 
				&tm_hour, &tm_min, &tm_sec, 
				&tm_mday, str_mon, &tm_year) == 6 && 
			search4month(str_mon, &tm_mon)) {
		tm.tm_hour = tm_hour;
		tm.tm_min = tm_min;
		tm.tm_sec = tm_sec;
		tm.tm_mday = tm_mday;
		tm.tm_mon = tm_mon;
		tm.tm_year = tm_year;
	}
	/* HH:MM:SS GMT DD mth YY */
	else if (sscanf(s, "%d:%d:%d GMT %d %400[a-zA-Z] %d", 
				&tm_hour, &tm_min, &tm_sec, 
				&tm_mday, str_mon, &tm_year) == 6 && 
			search4month(str_mon, &tm_mon)) {
		tm.tm_hour = tm_hour;
		tm.tm_min = tm_min;
		tm.tm_sec = tm_sec;
		tm.tm_mday = tm_mday;
		tm.tm_mon = tm_mon;
		tm.tm_year = tm_year;
	}
	/* wdy, DD-mth-YY HH:MM:SS GMT */
	else if (sscanf(s, "%400[a-zA-Z], %d-%400[a-zA-Z]-%d %d:%d:%d GMT", 
				str_wday, &tm_mday, str_mon, 
				&tm_year, &tm_hour, &tm_min, &tm_sec) == 7 && 
			search4wday(str_wday, &tm_wday) && 
			search4month(str_mon, &tm_mon)) {
		tm.tm_wday = tm_wday;
		tm.tm_mday = tm_mday;
		tm.tm_mon = tm_mon;
		tm.tm_year = tm_year;
		tm.tm_hour = tm_hour;
		tm.tm_min = tm_min;
		tm.tm_sec = tm_sec;
	}
	/* wdy, DD mth YY HH:MM:SS GMT */
	else if (sscanf(s, "%400[a-zA-Z], %d %400[a-zA-Z] %d %d:%d:%d GMT", 
				str_wday, &tm_mday, str_mon, 
				&tm_year, &tm_hour, &tm_min, &tm_sec) == 7 && 
			search4wday(str_wday, &tm_wday) && 
			search4month(str_mon, &tm_mon)) {
		tm.tm_wday = tm_wday;
		tm.tm_mday = tm_mday;
		tm.tm_mon = tm_mon;
		tm.tm_year = tm_year;
		tm.tm_hour = tm_hour;
		tm.tm_min = tm_min;
		tm.tm_sec = tm_sec;
	}
	/* wdy mth DD HH:MM:SS GMT YY */
	else if (sscanf(s, "%400[a-zA-Z] %400[a-zA-Z] %d %d:%d:%d GMT %d", 
				str_wday, str_mon, &tm_mday, 
				&tm_hour, &tm_min, &tm_sec, &tm_year) == 7 && 
			search4wday(str_wday, &tm_wday) && 
			search4month(str_mon, &tm_mon)) {
		tm.tm_wday = tm_wday;
		tm.tm_mon = tm_mon;
		tm.tm_mday = tm_mday;
		tm.tm_hour = tm_hour;
		tm.tm_min = tm_min;
		tm.tm_sec = tm_sec;
		tm.tm_year = tm_year;
	} else {
		elwix_SetErr(EINVAL, "Invalid date/time format");
		return (time_t) -1;
	}

	if (tm.tm_year > 1900)
		tm.tm_year -= 1900;
	else if (tm.tm_year < 70)
		tm.tm_year += 100;

	if ((tim = timegm(&tm)) == (time_t) -1)
		elwix_SetErr(EINVAL, "Invalid date/time format");
	return tim;
}

/*
 * time_rdtsc() - Get TSC timer value from CPU
 *
 * return: TSC in nanoseconds
 */
uint64_t
time_rdtsc(void)
{
#if defined(i386) || defined(__i386__)
	/* i386 */
	uint32_t hi, lo;

	asm volatile("rdtsc" : "=d" (hi), "=a" (lo));
	return (((uint64_t) hi << 32) | (uint64_t) lo);
#elif defined(amd64) || defined(__amd64__) || \
	defined(x86_64) || defined(__x86_64__)
	/* amd64 */
	uint64_t res;

	asm volatile("rdtsc" : "=a" (res));
	return res;
#else
	/* unsupported for this architecture, get time by ordinary way */
	struct timespec ts = { 0, 0LL };

	clock_gettime(CLOCK_UPTIME_PRECISE, &ts);
	return ((uint64_t) ts.tv_sec * 1000000000 + ts.tv_nsec);
#endif
}