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a9ce4dc76c
So far time_t values were interpreted as local time values. However, usually time_t values are to be interpreted as "seconds since 1 Jan 1970 in UTC". Therefore all logic handling time_t values has to be changed. - So far gmtime() called localtime() with an adjusted time_t, now localtime() calls gmtime() with an adjusted time_t. - mktime() has to do "the opposite" of localtime(), to keep it that way mktime() does now the inverse adjustment made by localtime(). - All currently present time() implementations internally call mktime() so they don't require individual adjustments.
74 lines
3.5 KiB
C
74 lines
3.5 KiB
C
/*****************************************************************************/
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/* */
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/* gmtime.c */
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/* */
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/* Convert calendar time into broken down time in UTC */
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/* */
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/* */
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/* */
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/* (C) 2002 Ullrich von Bassewitz */
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/* Wacholderweg 14 */
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/* D-70597 Stuttgart */
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/* EMail: uz@musoftware.de */
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/* */
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/* */
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/* This software is provided 'as-is', without any expressed or implied */
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/* warranty. In no event will the authors be held liable for any damages */
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/* arising from the use of this software. */
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/* */
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/* Permission is granted to anyone to use this software for any purpose, */
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/* including commercial applications, and to alter it and redistribute it */
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/* freely, subject to the following restrictions: */
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/* */
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/* 1. The origin of this software must not be misrepresented; you must not */
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/* claim that you wrote the original software. If you use this software */
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/* in a product, an acknowledgment in the product documentation would be */
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/* appreciated but is not required. */
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/* 2. Altered source versions must be plainly marked as such, and must not */
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/* be misrepresented as being the original software. */
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/* 3. This notice may not be removed or altered from any source */
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/* distribution. */
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/* */
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/*****************************************************************************/
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#include <time.h>
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/*****************************************************************************/
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/* Code */
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/*****************************************************************************/
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struct tm* __fastcall__ gmtime (const time_t* timep)
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{
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static struct tm timebuf;
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time_t t;
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/* Check the argument */
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if (timep == 0 || (long) (t = *timep) < 0) {
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/* Invalid arg */
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return 0;
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}
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/* Since our ints are just 16 bits, split the given time into seconds,
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** hours and days. Each of the values will fit in a 16 bit variable.
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** The mktime routine will then do the rest.
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*/
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timebuf.tm_sec = t % 3600;
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timebuf.tm_min = 0;
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timebuf.tm_hour = (t / 3600) % 24;
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timebuf.tm_mday = (t / (3600UL * 24UL)) + 1;
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timebuf.tm_mon = 0;
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timebuf.tm_year = 70; /* Base value is 1/1/1970 */
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/* Call mktime to do the final conversion */
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mktime (&timebuf);
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/* Return the result */
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return &timebuf;
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}
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