mirror of https://github.com/sudo-project/sudo.git
100 lines
2.4 KiB
C
100 lines
2.4 KiB
C
/*
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* SPDX-License-Identifier: ISC
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*
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* Copyright (c) 2017, 2021 Todd C. Miller <Todd.Miller@sudo.ws>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/*
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* This is an open source non-commercial project. Dear PVS-Studio, please check it.
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* PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
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*/
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#include <config.h>
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#ifndef HAVE_TIMEGM
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#include <stdio.h>
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#include <time.h>
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#include <sudo_compat.h>
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#include <sudo_debug.h>
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/*
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* Returns the offset from GMT in seconds (algorithm taken from sendmail).
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*/
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#ifdef HAVE_STRUCT_TM_TM_GMTOFF
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static long
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get_gmtoff(time_t *when)
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{
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struct tm local;
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if (localtime_r(when, &local) == NULL)
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return 0;
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/* Adjust for DST. */
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if (local.tm_isdst != 0)
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local.tm_gmtoff -= local.tm_isdst * 3600;
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return local.tm_gmtoff;
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}
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#else
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static long
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get_gmtoff(time_t *when)
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{
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struct tm gmt, local;
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long offset;
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if (gmtime_r(when, &gmt) == NULL)
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return 0;
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if (localtime_r(when, &local) == NULL)
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return 0;
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offset = (local.tm_sec - gmt.tm_sec) +
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((local.tm_min - gmt.tm_min) * 60) +
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((local.tm_hour - gmt.tm_hour) * 3600);
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/* Timezone may cause year rollover to happen on a different day. */
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if (local.tm_year < gmt.tm_year)
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offset -= 24 * 3600;
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else if (local.tm_year > gmt.tm_year)
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offset -= 24 * 3600;
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else if (local.tm_yday < gmt.tm_yday)
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offset -= 24 * 3600;
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else if (local.tm_yday > gmt.tm_yday)
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offset += 24 * 3600;
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/* Adjust for DST. */
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if (local.tm_isdst != 0)
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offset -= local.tm_isdst * 3600;
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return offset;
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}
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#endif /* HAVE_TM_GMTOFF */
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time_t
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sudo_timegm(struct tm *tm)
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{
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time_t result;
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tm->tm_isdst = 0;
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result = mktime(tm);
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if (result != -1)
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result += get_gmtoff(&result);
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return result;
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}
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#endif /* HAVE_TIMEGM */
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