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gnupg/common/gettime.c
2006-06-20 17:21:37 +00:00

306 lines
6.6 KiB
C

/* gettime.c - Wrapper for time functions
* Copyright (C) 1998, 2002 Free Software Foundation, Inc.
*
* This file is part of GnuPG.
*
* GnuPG is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* GnuPG 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*/
#include <config.h>
#include <stdlib.h>
#include <time.h>
#ifdef HAVE_LANGINFO_H
#include <langinfo.h>
#endif
#include "util.h"
static unsigned long timewarp;
static enum { NORMAL = 0, FROZEN, FUTURE, PAST } timemode;
/* Wrapper for the time(3). We use this here so we can fake the time
for tests */
time_t
gnupg_get_time ()
{
time_t current = time (NULL);
if (timemode == NORMAL)
return current;
else if (timemode == FROZEN)
return timewarp;
else if (timemode == FUTURE)
return current + timewarp;
else
return current - timewarp;
}
/* Return the current time (possibly faked) in ISO format. */
void
gnupg_get_isotime (gnupg_isotime_t timebuf)
{
time_t atime = gnupg_get_time ();
if (atime < 0)
*timebuf = 0;
else
{
struct tm *tp;
#ifdef HAVE_GMTIME_R
struct tm tmbuf;
tp = gmtime_r (&atime, &tmbuf);
#else
tp = gmtime (&atime);
#endif
sprintf (timebuf,"%04d%02d%02dT%02d%02d%02d",
1900 + tp->tm_year, tp->tm_mon+1, tp->tm_mday,
tp->tm_hour, tp->tm_min, tp->tm_sec);
}
}
/* set the time to NEWTIME so that gnupg_get_time returns a time
starting with this one. With FREEZE set to 1 the returned time
will never change. Just for completeness, a value of (time_t)-1
for NEWTIME gets you back to rality. Note that this is obviously
not thread-safe but this is not required. */
void
gnupg_set_time (time_t newtime, int freeze)
{
time_t current = time (NULL);
if ( newtime == (time_t)-1 || current == newtime)
{
timemode = NORMAL;
timewarp = 0;
}
else if (freeze)
{
timemode = FROZEN;
timewarp = current;
}
else if (newtime > current)
{
timemode = FUTURE;
timewarp = newtime - current;
}
else
{
timemode = PAST;
timewarp = current - newtime;
}
}
/* Returns true when we are in timewarp mode */
int
gnupg_faked_time_p (void)
{
return timemode;
}
/* This function is used by gpg because OpenPGP defines the timestamp
as an unsigned 32 bit value. */
u32
make_timestamp (void)
{
time_t t = gnupg_get_time ();
if (t == (time_t)-1)
log_fatal ("gnupg_get_time() failed\n");
return (u32)t;
}
/****************
* Scan a date string and return a timestamp.
* The only supported format is "yyyy-mm-dd"
* Returns 0 for an invalid date.
*/
u32
scan_isodatestr( const char *string )
{
int year, month, day;
struct tm tmbuf;
time_t stamp;
int i;
if( strlen(string) != 10 || string[4] != '-' || string[7] != '-' )
return 0;
for( i=0; i < 4; i++ )
if( !digitp (string+i) )
return 0;
if( !digitp (string+5) || !digitp(string+6) )
return 0;
if( !digitp(string+8) || !digitp(string+9) )
return 0;
year = atoi(string);
month = atoi(string+5);
day = atoi(string+8);
/* some basic checks */
if( year < 1970 || month < 1 || month > 12 || day < 1 || day > 31 )
return 0;
memset( &tmbuf, 0, sizeof tmbuf );
tmbuf.tm_mday = day;
tmbuf.tm_mon = month-1;
tmbuf.tm_year = year - 1900;
tmbuf.tm_isdst = -1;
stamp = mktime( &tmbuf );
if( stamp == (time_t)-1 )
return 0;
return stamp;
}
u32
add_days_to_timestamp( u32 stamp, u16 days )
{
return stamp + days*86400L;
}
/****************
* Return a string with a time value in the form: x Y, n D, n H
*/
const char *
strtimevalue( u32 value )
{
static char buffer[30];
unsigned int years, days, hours, minutes;
value /= 60;
minutes = value % 60;
value /= 60;
hours = value % 24;
value /= 24;
days = value % 365;
value /= 365;
years = value;
sprintf(buffer,"%uy%ud%uh%um", years, days, hours, minutes );
if( years )
return buffer;
if( days )
return strchr( buffer, 'y' ) + 1;
return strchr( buffer, 'd' ) + 1;
}
/*
* Note: this function returns GMT
*/
const char *
strtimestamp( u32 stamp )
{
static char buffer[11+5];
struct tm *tp;
time_t atime = stamp;
if (atime < 0) {
strcpy (buffer, "????" "-??" "-??");
}
else {
tp = gmtime( &atime );
sprintf(buffer,"%04d-%02d-%02d",
1900+tp->tm_year, tp->tm_mon+1, tp->tm_mday );
}
return buffer;
}
/*
* Note: this function returns GMT
*/
const char *
isotimestamp (u32 stamp)
{
static char buffer[25+5];
struct tm *tp;
time_t atime = stamp;
if (atime < 0)
{
strcpy (buffer, "????" "-??" "-??" " " "??" ":" "??" ":" "??");
}
else
{
tp = gmtime ( &atime );
sprintf (buffer,"%04d-%02d-%02d %02d:%02d:%02d",
1900+tp->tm_year, tp->tm_mon+1, tp->tm_mday,
tp->tm_hour, tp->tm_min, tp->tm_sec);
}
return buffer;
}
/****************
* Note: this function returns local time
*/
const char *
asctimestamp( u32 stamp )
{
static char buffer[50];
#if defined (HAVE_STRFTIME) && defined (HAVE_NL_LANGINFO)
static char fmt[50];
#endif
struct tm *tp;
time_t atime = stamp;
if (atime < 0) {
strcpy (buffer, "????" "-??" "-??");
return buffer;
}
tp = localtime( &atime );
#ifdef HAVE_STRFTIME
#if defined(HAVE_NL_LANGINFO)
mem2str( fmt, nl_langinfo(D_T_FMT), DIM(fmt)-3 );
if( strstr( fmt, "%Z" ) == NULL )
strcat( fmt, " %Z");
/* NOTE: gcc -Wformat-noliteral will complain here. I have
found no way to suppress this warning .*/
strftime (buffer, DIM(buffer)-1, fmt, tp);
#else
/* FIXME: we should check whether the locale appends a " %Z"
* These locales from glibc don't put the " %Z":
* fi_FI hr_HR ja_JP lt_LT lv_LV POSIX ru_RU ru_SU sv_FI sv_SE zh_CN
*/
strftime( buffer, DIM(buffer)-1, "%c %Z", tp );
#endif
buffer[DIM(buffer)-1] = 0;
#else
mem2str( buffer, asctime(tp), DIM(buffer) );
#endif
return buffer;
}