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/*
* Copyright 1995 Massachusetts Institute of Technology
*
* Permission to use, copy, modify, and distribute this software and
* its documentation for any purpose and without fee is hereby
* granted, provided that both the above copyright notice and this
* permission notice appear in all copies, that both the above
* copyright notice and this permission notice appear in all
* supporting documentation, and that the name of M.I.T. not be used
* in advertising or publicity pertaining to distribution of the
* software without specific, written prior permission. M.I.T. makes
* no representations about the suitability of this software for any
* purpose. It is provided "as is" without express or implied
* warranty.
*
* THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS
* ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
* SHALL M.I.T. 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.
*/
static const char rcsid[] =
"$Id: main.c,v 1.4 1995/10/06 02:46:23 jkh Exp $";
#include <stdio.h>
#include <ncurses.h>
#include <dialog.h>
#include <limits.h>
#include <time.h>
#include <stdlib.h>
#include <errno.h>
#include <fcntl.h>
#include "tzsetup.h"
#define PATH_LOCALTIME "/etc/localtime"
#define PATH_WALL_CMOS_CLOCK "/etc/wall_cmos_clock"
#define PATH_ZONEINFO "/usr/share/zoneinfo"
static int set_time();
enum cmos { CMOS_UTC, CMOS_LOCAL, CMOS_LEAVE } cmos_state = CMOS_LEAVE;
static int time_adjust = 0;
static enum cmos cmos(enum cmos);
static void fiddle_cmos(void);
int
main(void)
{
const char *tz;
init_dialog();
if (set_time() != 0) {
end_dialog();
exit(1);
}
tz = tzmenu();
fiddle_cmos();
dialog_notify("Daemons will only notice\n"
"a timezone change.\n"
"after rebooting.\n");
end_dialog();
return tz ? 0 : 1;
}
static int
set_time(void)
{
unsigned char result[_POSIX2_LINE_MAX];
unsigned char buf2[_POSIX2_LINE_MAX];
static struct tm usertm, systm;
time_t usertime, systime;
long diff;
int rv;
/*
* If /etc/wall_cmos_clock exists, or if there is already a timezone
* file installed, then just leave it alone and don't ask the user
* what time it is (because the system clock is already in POSIX
* time so we don't need to adjust anything later on).
*/
time(&systime);
systm = *localtime(&systime);
if (systm.tm_zone[0]
|| access(PATH_WALL_CMOS_CLOCK, 0) == 0) {
cmos_state = CMOS_LEAVE;
return 0;
}
usertm = systm;
usertm.tm_isdst = -1;
result[0] = '\0';
while(1) {
rv = dialog_inputbox("Checking current time",
"Please enter the current local time"
" using 24-hour style,\n"
"in the form HH:MM",
8, 78, result);
if (rv != 0)
return 1;
if (result[0]) {
if (sscanf(result, "%d:%d:%d", &usertm.tm_hour,
&usertm.tm_min,
&usertm.tm_sec) < 2) {
snprintf(buf2, sizeof buf2,
"Invalid time format: %s", result);
dialog_notify(buf2);
continue;
}
usertime = mktime(&usertm);
if (usertime == (time_t)-1) {
snprintf(buf2, sizeof buf2,
"Unreasonable time: %s", result);
dialog_notify(buf2);
continue;
}
diff = usertime - systime;
if (labs(diff) > 15*60) {
cmos_state = cmos(CMOS_LOCAL);
if (diff > 0) {
time_adjust = ((diff + 15*60)/(30*60)
* 30*60);
} else {
time_adjust = ((diff - 15*60)/(30*60)
* 30*60);
}
} else {
cmos_state = cmos(CMOS_UTC);
time_adjust = 0;
}
break;
}
}
return 0;
}
static unsigned char *cmos_list[] = {
"1", "CMOS clock is set to Universal time (UTC)",
"2", "CMOS clock is set to local time",
"3", "I'm not sure, leave it alone"
};
static enum cmos
cmos(enum cmos state)
{
int rv, sel = 0;
unsigned char buf[_POSIX2_LINE_MAX];
unsigned char result[_POSIX2_LINE_MAX];
snprintf(buf, sizeof buf, "%s seems most likely",
state == CMOS_UTC ? "UTC" : "local time");
rv = dialog_menu("CMOS clock in local time or UTC",
buf, 12, 78, 3, 3, cmos_list, result, &sel, 0);
if (rv == 0) {
return sel;
} else {
return state;
}
}
static void
fiddle_cmos(void)
{
int fd;
switch(cmos_state) {
case CMOS_LEAVE:
break;
case CMOS_UTC:
if (unlink(PATH_WALL_CMOS_CLOCK) == -1 &&
errno != ENOENT)
dialog_notify("Error removing " PATH_WALL_CMOS_CLOCK);
break;
case CMOS_LOCAL:
if ((fd = open(PATH_WALL_CMOS_CLOCK, O_RDONLY|O_CREAT, 0644))
== -1)
dialog_notify("Error creating " PATH_WALL_CMOS_CLOCK);
else
close(fd);
break;
}
}
int
setzone(const char *zone)
{
time_t systime;
struct tm *tm;
char msg[_POSIX2_LINE_MAX];
int rv;
FILE *ifp, *ofp;
snprintf(msg, sizeof msg, "TZ=%s", zone);
putenv(msg);
tzset();
time(&systime);
systime += time_adjust;
tm = localtime(&systime);
snprintf(msg, sizeof msg,
"Does %02d:%02d:%02d %d.%d.%04d %s look reasonable?",
tm->tm_hour, tm->tm_min, tm->tm_sec, tm->tm_mday,
tm->tm_mon + 1, tm->tm_year + 1900, tm->tm_zone);
rv = dialog_yesno("Verifying timezone selection",
msg, -1, -1);
if (rv)
return 1;
snprintf(msg, sizeof msg, PATH_ZONEINFO "/%s", zone);
ifp = fopen(msg, "r");
if (!ifp) {
snprintf(msg, sizeof msg,
"Could not open " PATH_ZONEINFO "/%s: %s",
zone, strerror(errno));
dialog_notify(msg);
return 1;
}
ofp = fopen(PATH_LOCALTIME, "w");
if (!ofp) {
snprintf(msg, sizeof msg, "Could not open " PATH_LOCALTIME
": %s", strerror(errno));
dialog_notify(msg);
fclose(ifp);
return 1;
}
while((rv = fread(msg, 1, sizeof msg, ifp)) > 0) {
int rv2;
if((rv2 = fwrite(msg, 1, rv, ofp)) != rv) {
snprintf(msg, sizeof msg,
"Could not write " PATH_LOCALTIME ": %s",
strerror(errno));
out:
dialog_notify(msg);
fclose(ifp);
fclose(ofp);
unlink(PATH_LOCALTIME);
return 1;
}
}
if (rv < 0) {
snprintf(msg, sizeof msg, "Could not read timezone file: %s",
strerror(errno));
goto out;
}
fclose(ifp);
fclose(ofp);
snprintf(msg, sizeof msg, "Installed timezone file %s", zone);
dialog_notify(msg);
return 0;
}
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