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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 14:37:38 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 14:37:38 +0000 |
commit | ae581a19fbe896a797450b9d9573fb66f2735227 (patch) | |
tree | 56c40be8518a29c9351364d13a9676aa83932dc0 /lib/util/timegm.c | |
parent | Initial commit. (diff) | |
download | sudo-ae581a19fbe896a797450b9d9573fb66f2735227.tar.xz sudo-ae581a19fbe896a797450b9d9573fb66f2735227.zip |
Adding upstream version 1.9.13p3.upstream/1.9.13p3upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | lib/util/timegm.c | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/lib/util/timegm.c b/lib/util/timegm.c new file mode 100644 index 0000000..968d829 --- /dev/null +++ b/lib/util/timegm.c @@ -0,0 +1,99 @@ +/* + * SPDX-License-Identifier: ISC + * + * Copyright (c) 2017, 2021 Todd C. Miller <Todd.Miller@sudo.ws> + * + * Permission to use, copy, modify, and distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ + +/* + * This is an open source non-commercial project. Dear PVS-Studio, please check it. + * PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com + */ + +#include <config.h> + +#ifndef HAVE_TIMEGM + +#include <stdio.h> +#include <time.h> + +#include "sudo_compat.h" +#include "sudo_debug.h" + +/* + * Returns the offset from GMT in seconds (algorithm taken from sendmail). + */ +#ifdef HAVE_STRUCT_TM_TM_GMTOFF +static long +get_gmtoff(time_t *when) +{ + struct tm local; + + if (localtime_r(when, &local) == NULL) + return 0; + + /* Adjust for DST. */ + if (local.tm_isdst != 0) + local.tm_gmtoff -= local.tm_isdst * 3600; + + return local.tm_gmtoff; +} +#else +static long +get_gmtoff(time_t *when) +{ + struct tm gmt, local; + long offset; + + if (gmtime_r(when, &gmt) == NULL) + return 0; + if (localtime_r(when, &local) == NULL) + return 0; + + offset = (local.tm_sec - gmt.tm_sec) + + ((local.tm_min - gmt.tm_min) * 60) + + ((local.tm_hour - gmt.tm_hour) * 3600); + + /* Timezone may cause year rollover to happen on a different day. */ + if (local.tm_year < gmt.tm_year) + offset -= 24 * 3600; + else if (local.tm_year > gmt.tm_year) + offset -= 24 * 3600; + else if (local.tm_yday < gmt.tm_yday) + offset -= 24 * 3600; + else if (local.tm_yday > gmt.tm_yday) + offset += 24 * 3600; + + /* Adjust for DST. */ + if (local.tm_isdst != 0) + offset -= local.tm_isdst * 3600; + + return offset; +} +#endif /* HAVE_TM_GMTOFF */ + +time_t +sudo_timegm(struct tm *tm) +{ + time_t result; + + tm->tm_isdst = 0; + result = mktime(tm); + if (result != -1) + result += get_gmtoff(&result); + + return result; +} + +#endif /* HAVE_TIMEGM */ |