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/*
Date manipulation routines
Copyright (C) 1999-2000, Joe Orton <joe@orton.demon.co.uk>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA
Id: dates.c,v 1.5 2000/05/09 18:25:37 joe Exp
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <sys/types.h>
#include <time.h>
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#include <stdio.h>
#include "xalloc.h"
#include "dates.h"
/* Generic date manipulation routines. */
/* RFC1123: Sun, 06 Nov 1994 08:49:37 GMT */
#define RFC1123_FORMAT "%3s, %02d %3s %4d %02d:%02d:%02d GMT"
/* RFC850: Sunday, 06-Nov-94 08:49:37 GMT */
#define RFC1036_FORMAT "%s, %2d-%3s-%2d %2d:%2d:%2d GMT"
/* asctime: Wed Jun 30 21:49:08 1993 */
#define ASCTIME_FORMAT "%3s %3s %2d %2d:%2d:%2d %4d"
static const char *rfc1123_weekdays[7] = {
"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
};
static const char *short_months[12] = {
"Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
};
/* Returns the time/date GMT, in RFC1123-type format: eg
* Sun, 06 Nov 1994 08:49:37 GMT. */
char *rfc1123_date( time_t anytime ) {
struct tm *gmt;
char *ret;
gmt = gmtime( &anytime );
ret = xmalloc( 29 + 1 ); /* dates are 29 chars long */
/* it goes: Sun, 06 Nov 1994 08:49:37 GMT */
snprintf( ret, 30, RFC1123_FORMAT,
rfc1123_weekdays[gmt->tm_wday], gmt->tm_mday,
short_months[gmt->tm_mon], 1900 + gmt->tm_year,
gmt->tm_hour, gmt->tm_min, gmt->tm_sec );
return ret;
}
/* Takes an RFC1123-formatted date string and returns the time_t.
* Returns (time_t)-1 if the parse fails. */
time_t rfc1123_parse( const char *date ) {
struct tm gmt = {0};
static char wkday[4], mon[4];
int n;
/* it goes: Sun, 06 Nov 1994 08:49:37 GMT */
n = sscanf( date, RFC1123_FORMAT,
wkday, &gmt.tm_mday, mon, &gmt.tm_year, &gmt.tm_hour,
&gmt.tm_min, &gmt.tm_sec );
/* Is it portable to check n==7 here? */
gmt.tm_year -= 1900;
for( n=0; n<12; n++ )
if( strcmp( mon, short_months[n] ) == 0 )
break;
/* tm_mon comes out as 12 if the month is corrupt, which is desired,
* since the mktime will then fail */
gmt.tm_mon = n;
return mktime( &gmt );
}
/* Takes a string containing a RFC1036-style date and returns the time_t */
time_t rfc1036_parse( const char *date ) {
struct tm gmt = {0};
int n;
static char wkday[10], mon[4];
/* RFC850/1036 style dates: Sunday, 06-Nov-94 08:49:37 GMT */
n = sscanf( RFC1036_FORMAT,
wkday, &gmt.tm_mday, mon, &gmt.tm_year,
&gmt.tm_hour, &gmt.tm_min, &gmt.tm_sec );
/* portable to check n here? */
for( n=0; n<12; n++ )
if( strcmp( mon, short_months[n] ) == 0 )
break;
/* tm_mon comes out as 12 if the month is corrupt, which is desired,
* since the mktime will then fail */
gmt.tm_mon = n;
return mktime( &gmt );
}
/* (as)ctime dates are like:
* Wed Jun 30 21:49:08 1993
*/
time_t asctime_parse( const char *date ) {
struct tm gmt = {0};
int n;
static char wkday[4], mon[4];
n = sscanf( ASCTIME_FORMAT,
wkday, mon, &gmt.tm_mday,
&gmt.tm_hour, &gmt.tm_min, &gmt.tm_sec,
&gmt.tm_year );
/* portable to check n here? */
for( n=0; n<12; n++ )
if( strcmp( mon, short_months[n] ) == 0 )
break;
/* tm_mon comes out as 12 if the month is corrupt, which is desired,
* since the mktime will then fail */
gmt.tm_mon = n;
return mktime( &gmt );
}
#undef RFC1036_FORMAT
#undef ASCTIME_FORMAT
#undef RFC1123_FORMAT
#ifdef RFC1123_TEST
int main( int argc, char **argv ) {
time_t now, in;
char *out;
if( argc > 1 ) {
printf( "Got: %s\n", argv[1] );
in = rfc1123_parse( argv[1] );
printf( "Parsed: %d\n", in );
out = rfc1123_date( in );
printf( "Back again: %s\n", out );
} else {
now = time(NULL);
out = rfc1123_date(now);
in = rfc1123_parse(out);
printf( "time(NULL) = %d\n", now );
printf( "RFC1123 Time: [%s]\n", out );
printf( "Parsed = %d\n", in );
out = rfc1123_date( in );
printf( "Back again: [%s]\n", out );
}
return 0;
}
#endif
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