mirror of
https://https.git.savannah.gnu.org/git/bash.git
synced 2026-06-21 12:57:58 +02:00
Chet Ramey
295 lines
9.0 KiB
C
295 lines
9.0 KiB
C
/* strptime - take a date-time string and turn it into seconds since the epoch. */
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/* See Makefile for compilation details. */
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/*
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Copyright (C) 2023-2025 Free Software Foundation, Inc.
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This file is part of GNU Bash.
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Bash is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Bash 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Bash. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <config.h>
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#if defined (HAVE_UNISTD_H)
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# include <unistd.h>
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#endif
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#include "bashtypes.h"
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#include "posixtime.h"
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#include <stdio.h>
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#include "builtins.h"
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#include "shell.h"
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#include "bashgetopt.h"
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#include "common.h"
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struct date_modifier
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{
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char *shorthand;
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int incr;
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};
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static struct date_modifier date_time_modifiers[] =
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{
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{ "now", 0 },
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{ "today", 0 },
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{ "tomorrow", 24*60*60 },
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{ "yesterday", -24*60*60 },
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{ "day after tomorrow", 48*60*60 },
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{ "two days ago", -48*60*60 },
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{ "next week", 7*24*60*60 },
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{ "last week", -7*24*60*60 },
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{ "the day after tomorrow", 48*60*60 },
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{ 0, 0 }
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};
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static char * const date_time_formats[] =
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{
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"%a %b %d %T %Z %Y", /* Unix date */
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"%a %b %d %T %Y", /* Wkd Mon DD HH:MM:SS YYYY */
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"%FT%T%z", /* ISO8601 time YYYY-mm-ddTHH:MM:SSzone */
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"%FT%R%z", /* ISO8601 time YYYY-mm-ddTHH:MMzone */
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"%G-%m-%dT%T%z", /* ISO8601 time YYYY-mm-ddTHH:MM:SSzone */
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"%G-%m-%dT%R%z", /* ISO8601 time YYYY-mm-ddTHH:MMzone */
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"%G-%m-%d", /* ISO8601 time YYYY-mm-dd */
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/* Can't do 8601 time zone offset with colon or fractions of a second */
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"%a, %d %b %Y %T %Z", /* RFC822/RFC2822 time */
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"%a, %d %b %Y %T %z", /* RFC822/RFC2822 time */
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"%D %T", /* mm/dd/yy HH:MM:SS */
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"%D %R", /* mm/dd/yy HH:MM */
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"%D %r", /* mm/dd/yy HH:MM:SS a.m. */
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"%D %I:%M %p", /* mm/dd/yy HH:MM p.m. */
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"%m/%d/%Y %T", /* mm/dd/YYYY HH:MM:SS */
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"%m/%d/%Y %R", /* mm/dd/YYYY HH:MM */
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"%m/%d/%Y %r", /* mm/dd/YYYY HH:MM:SS a.m */
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"%m/%d/%Y %I:%M %p", /* mm/dd/YYYY HH:MM p.m. */
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"%m-%d-%Y %T", /* mm-dd-YYYY HH:MM:SS */
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"%m-%d-%Y %R", /* mm-dd-YYYY HH:MM */
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"%m-%d-%Y %r", /* mm-dd-YYYY HH:MM:SS a.m. */
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"%m-%d-%Y %I:%M %p", /* mm-dd-YYYY HH:MM p.m. */
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"%Y/%m/%d %T", /* YYYY/mm/dd HH:MM:SS */
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"%Y/%m/%d %R", /* YYYY/mm/dd HH:MM */
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"%Y/%m/%d %r", /* YYYY/mm/dd hh:MM:SS a.m. */
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"%F %T", /* YYYY-mm-dd HH:MM:SS */
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"%F %r", /* YYYY-mm-dd HH:MM:SS p.m. */
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"%F %R", /* YYYY-mm-dd HH:MM */
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"%F %I:%M %p", /* YYYY-mm-dd HH:MM a.m. */
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/* From coreutils-9.2 date */
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"%Y-%m-%dT%H:%M:%S%z", /* ISO8601 time */
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"%Y-%m-%dT%H%z", /* ISO8601 time */
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"%Y-%m-%dT%H:%M%z", /* ISO8601 time */
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"%Y-%m-%dT%H:%M:%S%Z", /* ISO8601 time but with timezone name */
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"%Y-%m-%dT%H%Z", /* ISO8601 time but with timezone name */
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"%Y-%m-%dT%H:%M%Z", /* ISO8601 time but with timezone name */
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/* RFC 3339 time */
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"%Y-%m-%d %H:%M:%S%z", /* RFC 3339 time */
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"%Y-%m-%d %H:%M:%S%Z", /* RFC 3339 time but with timezone name */
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#if 0
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"%Y-%m-%dT%H:%M:%S%z", /* RFC 3339 time, same as first ISO8601 time */
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#endif
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/* more oddball formats */
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"%m.%d.%Y %T", /* mm.dd.YYYY HH:MM:SS */
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"%m.%d.%Y %R", /* mm.dd.YYYY HH:MM */
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"%m.%d.%Y %r", /* mm.dd.YYYY HH:MM:SS a.m. */
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"%m.%d.%Y %I:%M %p", /* mm.dd.YYYY HH:MM p.m. */
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"%m/%d/%Y", /* mm/dd/YYYY */
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"%d %B %Y %T", /* dd Month YYYY HH:MM:SS */
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"%d %B %Y %R", /* dd Month YYYY HH:MM */
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"%d %B %Y %r", /* dd Month YYYY HH:MM:SS a.m. */
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"%d %B %Y %I:%M %p", /* dd Month YYYY HH:MM p.m. */
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"%d %b %Y %T", /* dd Mon YYYY HH:MM:SS */
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"%d %b %Y %R", /* dd Mon YYYY HH:MM */
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"%d %b %Y %r", /* dd Mon YYYY HH:MM:SS a.m. */
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"%d %b %Y %I:%M %p", /* dd Mon YYYY HH:MM p.m. */
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"%b %d, %Y %T", /* Mon dd, YYYY HH:MM:SS */
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"%b %d, %Y %R", /* Mon dd, YYYY HH:MM */
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"%b %d, %Y %r", /* Mon dd, YYYY HH:MM:SS a.m. */
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"%b %d, %Y %I:%M %p", /* Mon dd, YYYY HH:MM p.m. */
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"%m-%b-%Y", /* dd-Mon-YYYY */
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"%m-%b-%Y %T", /* dd-Mon-YYYY HH:MM:SS */
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"%m-%b-%Y %R", /* dd-Mon-YYYY HH:MM */
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"%m-%b-%Y %r", /* dd-Mon-YYYY HH:MM:SS a.m. */
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"%m-%b-%Y %I:%M %p", /* dd-Mon-YYYY HH:MM p.m. */
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"%d/%b/%Y:%T %z", /* NCSA log format dd/Mon/YYYY:HH:MM:SS zone */
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"%d/%b/%Y:%T%z", /* NCSA log format dd/Mon/YYYY:HH:MM:SSzone */
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/* No delimiters */
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"%Y%m%d %T", /* YYYYMMDD HH:MM:SS */
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"%Y%m%d %R", /* YYYYMMDD HH:MM */
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"%Y%m%d %r", /* YYYYMMDD HH:MM:SS a.m. */
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"%Y%m%d %I:%M %p", /* YYYYMMDD HH:MM p.m. */
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"%Y%m%d %H:%M:%S%z", /* YYYYMMDD HH:MM:SSzone */
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"%Y%m%dT%H:%M:%S%z", /* YYYYMMDDTHH:MM:SSzone */
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"%Y%m%dT%T", /* YYYYMMDDTHH:MM:SS */
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"%Y%m%dT%R", /* YYYYMMDDTHH:MM */
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/* Non-US formats */
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"%d-%m-%Y", /* dd-mm-YYYY */
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"%d-%m-%Y %T", /* dd-mm-YYYY HH:MM:SS */
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"%d-%m-%Y %R", /* dd-mm-YYYY HH:MM */
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"%d-%m-%Y %r", /* dd-mm-YYYY HH:MM:SS a.m. */
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"%d-%m-%Y %I:%M %p", /* dd-mm-YYYY HH:MM p.m. */
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"%d/%m/%Y %T", /* dd/mm/YYYY HH:MM:SS */
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"%d/%m/%Y %R", /* dd/mm/YYYY HH:MM */
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"%d/%m/%Y %r", /* dd/mm/YYYY HH:MM:SS a.m. */
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"%d/%m/%Y %I:%M %p", /* dd/mm/YYYY HH:MM p.m. */
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"%Y-%d-%m %T", /* YYYY-dd-mm HH:MM:SS */
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"%Y-%d-%m %R", /* YYYY-dd-mm HH:MM */
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"%d-%m-%Y %T", /* dd-mm-YYYY HH:MM:SS */
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"%d-%m-%Y %R", /* dd-mm-YYYY HH:MM */
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"%d-%m-%Y %r", /* dd-mm-YYYY HH:MM:SS a.m. */
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"%d-%m-%Y %I:%M %p", /* dd-mm-YYYY HH:MM p.m. */
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"%d.%m.%Y %T", /* dd.mm.YYYY HH:MM:SS */
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"%d.%m.%Y %R", /* dd.mm.YYYY HH:MM */
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"%d.%m.%Y %r", /* dd.mm.YYYY HH:MM:SS a.m. */
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"%d.%m.%Y %I:%M %p", /* dd.mm.YYYY HH:MM p.m. */
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/* Some fallbacks */
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"%F", /* YYYY-mm-dd ISO8601 time */
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"%T", /* HH:MM:SS */
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"%H.%M.%S", /* HH.MM.SS */
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0
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};
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static void
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inittime (time_t *clock, struct tm *timeptr)
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{
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struct tm *loctime;
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/* Initialize to local time */
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loctime = localtime (clock);
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if (loctime == 0)
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{
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timeptr->tm_hour = timeptr->tm_min = timeptr->tm_sec = 0;
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return;
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}
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memcpy (timeptr, loctime, sizeof (struct tm));
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/* but default to midnight */
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timeptr->tm_hour = timeptr->tm_min = timeptr->tm_sec = 0;
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/* and let the system figure out the right DST offset */
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timeptr->tm_isdst = -1;
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}
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int
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strptime_builtin (WORD_LIST *list)
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{
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char *s;
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struct tm t, *tm;
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time_t now, secs;
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char *datestr, *format;
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int i, opt;
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format = NULL;
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reset_internal_getopt ();
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while ((opt = internal_getopt (list, "f:")) != -1)
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{
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switch (opt)
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{
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case 'f':
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format = list_optarg;
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break;
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CASE_HELPOPT;
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default:
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builtin_usage ();
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return (EX_USAGE);
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}
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}
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list = loptend;
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if (list == 0)
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{
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builtin_usage ();
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return (EX_USAGE);
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}
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datestr = string_list (list);
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if (datestr == 0 || *datestr == 0)
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return (EXECUTION_SUCCESS);
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now = getnow ();
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secs = -1;
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for (i = 0; date_time_modifiers[i].shorthand; i++)
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{
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if (STREQ (datestr, date_time_modifiers[i].shorthand))
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{
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secs = now + date_time_modifiers[i].incr;
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printf ("%ld\n", secs);
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return (EXECUTION_SUCCESS);
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}
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}
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/* init struct tm */
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inittime (&now, &t);
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if (format)
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{
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s = strptime (datestr, format, &t);
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if (s == 0 || s == datestr)
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{
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builtin_error ("%s: unrecognized format", datestr);
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return (EXECUTION_FAILURE);
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}
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}
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else
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{
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for (i = 0; date_time_formats[i]; i++)
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{
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s = strptime (datestr, date_time_formats[i], &t);
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if (s == 0 || s == datestr)
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continue;
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break;
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}
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if (date_time_formats[i] == 0)
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{
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builtin_error ("%s: unrecognized format", datestr);
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return (EXECUTION_FAILURE);
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}
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}
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/* Found something. */
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secs = mktime (&t);
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if (s && *s)
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builtin_warning("%s: not completely converted (%s)", datestr, s);
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printf ("%ld\n", secs);
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return (EXECUTION_SUCCESS);
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}
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char *strptime_doc[] = {
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"Convert a date-time string to seconds since the epoch.",
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"",
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"Take DATE-TIME, a date-time string, and parse it using FORMAT, a",
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"date and time format accepted by strptime(3). If FORMAT is not supplied,",
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"attempt to parse DATE-TIME against a set of common date-time formats,",
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"not all of which may be acceptable to strptime(3).",
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"If the string matches one of the formats, convert it into seconds",
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"since the epoch and display the result.",
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(char *)NULL
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};
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/* The standard structure describing a builtin command. bash keeps an array
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of these structures. The flags must include BUILTIN_ENABLED so the
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builtin can be used. */
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struct builtin strptime_struct = {
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"strptime", /* builtin name */
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strptime_builtin, /* function implementing the builtin */
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BUILTIN_ENABLED, /* initial flags for builtin */
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strptime_doc, /* array of long documentation strings. */
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"strptime [-f format] date-time", /* usage synopsis; becomes short_doc */
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0 /* reserved for internal use */
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};
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