timegm

android 2.3 에는 timegm 이 포함되어 있다 하지만 localtime.c 에만 선언되어 있고 define 으로 막아져 있는 상태 인데 이를 사용하기 위해선 time.h 에 다음과 같이 코드를 추가 한 뒤 android.mk 에 STD_INSPIRED 디파인을 추가하면 사용할 수 있게 된다.

[code]
extern time_t timelocal(struct tm *tm);
extern time_t timegm(struct tm* tm);
extern time_t time2posix(time_t ti);
extern time_t posix2time(time_t ti);
[/code]




기타 timegm 의 소스

http://trac.rtmpd.com/browser/trunk/sources/common/src/new/platform/android/timegm.cpp?rev=56

[code]
/*
* Copyright (c) 1997 Kungliga Tekniska Hi¿œgskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* 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. Neither the name of the Institute 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 THE INSTITUTE 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 INSTITUTE 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.
*/
#ifdef ANDROID
#include "new/platform/platform.h"
int is_leap(unsigned y) {
        y += 1900;
        return (y % 4) == 0 && ((y % 100) != 0 || (y % 400) == 0);
}
time_t timegm(struct tm *tm) {
        static const unsigned ndays[2][12] = {
                {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},
                {31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}
        };
        time_t res = 0;
        int i;
        for (i = 70; i < tm->tm_year; ++i)
                res += is_leap(i) ? 366 : 365;
        for (i = 0; i < tm->tm_mon; ++i)
                res += ndays[is_leap(tm->tm_year)][i];
        res += tm->tm_mday - 1;
        res *= 24;
        res += tm->tm_hour;
        res *= 60;
        res += tm->tm_min;
        res *= 60;
        res += tm->tm_sec;
        return res;
}
#endif /* ANDROID */
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