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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 12:50:00 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 12:50:00 +0000 |
commit | 333f7ecfa3e040191c66b2b92f6c117ca2cbac1d (patch) | |
tree | 178a8f140927896970f47930dae9213161268f10 /libmisc/gettime.c | |
parent | Initial commit. (diff) | |
download | shadow-333f7ecfa3e040191c66b2b92f6c117ca2cbac1d.tar.xz shadow-333f7ecfa3e040191c66b2b92f6c117ca2cbac1d.zip |
Adding upstream version 1:4.8.1.upstream/1%4.8.1upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'libmisc/gettime.c')
-rw-r--r-- | libmisc/gettime.c | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/libmisc/gettime.c b/libmisc/gettime.c new file mode 100644 index 0000000..0e25a4b --- /dev/null +++ b/libmisc/gettime.c @@ -0,0 +1,89 @@ +/* + * Copyright (c) 2017, Chris Lamb + * 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. The name of the copyright holders or contributors may not be used to + * endorse or promote products derived from this software without + * specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT + * HOLDERS 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. + */ + +#include <config.h> + +#ident "$Id$" + +#include <errno.h> +#include <limits.h> +#include <stdio.h> +#include "defines.h" +#include "prototypes.h" + +/* + * gettime() returns the time as the number of seconds since the Epoch + * + * Like time(), gettime() returns the time as the number of seconds since the + * Epoch, 1970-01-01 00:00:00 +0000 (UTC), except that if the SOURCE_DATE_EPOCH + * environment variable is exported it will use that instead. + */ +/*@observer@*/time_t gettime () +{ + char *endptr; + char *source_date_epoch; + time_t fallback; + unsigned long long epoch; + + fallback = time (NULL); + source_date_epoch = shadow_getenv ("SOURCE_DATE_EPOCH"); + + if (!source_date_epoch) + return fallback; + + errno = 0; + epoch = strtoull (source_date_epoch, &endptr, 10); + if ((errno == ERANGE && (epoch == ULLONG_MAX || epoch == 0)) + || (errno != 0 && epoch == 0)) { + fprintf (stderr, + _("Environment variable $SOURCE_DATE_EPOCH: strtoull: %s\n"), + strerror(errno)); + } else if (endptr == source_date_epoch) { + fprintf (stderr, + _("Environment variable $SOURCE_DATE_EPOCH: No digits were found: %s\n"), + endptr); + } else if (*endptr != '\0') { + fprintf (stderr, + _("Environment variable $SOURCE_DATE_EPOCH: Trailing garbage: %s\n"), + endptr); + } else if (epoch > ULONG_MAX) { + fprintf (stderr, + _("Environment variable $SOURCE_DATE_EPOCH: value must be smaller than or equal to %lu but was found to be: %llu\n"), + ULONG_MAX, epoch); + } else if (epoch > fallback) { + fprintf (stderr, + _("Environment variable $SOURCE_DATE_EPOCH: value must be smaller than or equal to the current time (%lu) but was found to be: %llu\n"), + fallback, epoch); + } else { + /* Valid */ + return (time_t)epoch; + } + + return fallback; +} |