71 lines
1.9 KiB
C
71 lines
1.9 KiB
C
/*
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* Copyright (c) 2017 Todd C. Miller <Todd.Miller@courtesan.com>
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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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#include <config.h>
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#include <sys/types.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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#include "sudo_compat.h"
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#include "sudoers_debug.h"
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#include "parse.h"
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/*
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* Returns the offset from GMT in seconds (algorithm taken from sendmail).
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* Warning: clobbers the static storage used by localtime() and gmtime().
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*/
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#ifdef HAVE_STRUCT_TM_TM_GMTOFF
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long
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get_gmtoff(time_t *clock)
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{
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struct tm *local;
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local = localtime(clock);
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return local->tm_gmtoff;
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}
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#else
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long
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get_gmtoff(time_t *clock)
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{
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struct tm *gm, gmt, *local;
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long offset;
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if ((gm = gmtime(clock)) == NULL)
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return 0;
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gmt = *gm;
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if ((local = localtime(clock)) == 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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return offset;
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}
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#endif /* HAVE_TM_GMTOFF */
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