9b65159a57
Unlike the corresponding mktime C library function, the libdivecomputer function will never modify its argument. By marking the parameter as const this is made more explicit.
131 lines
2.5 KiB
C
131 lines
2.5 KiB
C
/*
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* libdivecomputer
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*
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* Copyright (C) 2010 Jef Driesen
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301 USA
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <time.h>
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#include <libdivecomputer/datetime.h>
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static struct tm *
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dc_localtime_r (const time_t *t, struct tm *tm)
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{
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#ifdef HAVE_LOCALTIME_R
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return localtime_r (t, tm);
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#else
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struct tm *p = localtime (t);
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if (p == NULL)
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return NULL;
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if (tm)
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*tm = *p;
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return tm;
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#endif
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}
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static struct tm *
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dc_gmtime_r (const time_t *t, struct tm *tm)
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{
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#ifdef HAVE_GMTIME_R
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return gmtime_r (t, tm);
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#else
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struct tm *p = gmtime (t);
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if (p == NULL)
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return NULL;
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if (tm)
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*tm = *p;
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return tm;
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#endif
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}
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dc_ticks_t
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dc_datetime_now (void)
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{
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return time (NULL);
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}
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dc_datetime_t *
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dc_datetime_localtime (dc_datetime_t *result,
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dc_ticks_t ticks)
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{
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time_t t = ticks;
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struct tm tm;
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if (dc_localtime_r (&t, &tm) == NULL)
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return NULL;
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if (result) {
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result->year = tm.tm_year + 1900;
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result->month = tm.tm_mon + 1;
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result->day = tm.tm_mday;
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result->hour = tm.tm_hour;
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result->minute = tm.tm_min;
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result->second = tm.tm_sec;
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}
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return result;
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}
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dc_datetime_t *
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dc_datetime_gmtime (dc_datetime_t *result,
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dc_ticks_t ticks)
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{
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time_t t = ticks;
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struct tm tm;
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if (dc_gmtime_r (&t, &tm) == NULL)
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return NULL;
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if (result) {
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result->year = tm.tm_year + 1900;
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result->month = tm.tm_mon + 1;
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result->day = tm.tm_mday;
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result->hour = tm.tm_hour;
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result->minute = tm.tm_min;
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result->second = tm.tm_sec;
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}
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return result;
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}
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dc_ticks_t
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dc_datetime_mktime (const dc_datetime_t *dt)
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{
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if (dt == NULL)
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return -1;
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struct tm tm;
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tm.tm_year = dt->year - 1900;
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tm.tm_mon = dt->month - 1;
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tm.tm_mday = dt->day;
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tm.tm_hour = dt->hour;
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tm.tm_min = dt->minute;
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tm.tm_sec = dt->second;
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tm.tm_isdst = -1;
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return mktime (&tm);
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}
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