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/*
* Compile with:
* gcc $(pkg-config --cflags --libs libgpod-1.0) -o tz ./get-timezone.c
*
* then run:
* ./tz <ipod-mountpoint>
*
* This should output something like:
* Timezone: UTC+1 DST
*
* which means I'm living in an UTC+1 timezone with DST which adds a 1 hour
* shift, ie my local time is UTC+2. DST won't be shown if not active.
*
*/
#include <errno.h>
#include <stdio.h>
#include <itdb.h>
int main (int argc, char **argv)
{
char *mountpoint;
char *device_dir;
char *prefs_filename;
FILE *f;
int result;
gint32 timezone;
const int GMT_OFFSET = 0x19;
if (argc >= 2) {
mountpoint = argv[1];
} else {
g_print ("Usage: %s <mountpoint>\n\n", g_basename(argv[0]));
return -1;
}
device_dir = itdb_get_device_dir (mountpoint);
if (device_dir == NULL) {
g_print ("No iPod mounted at %s\n", mountpoint);
return -1;
}
prefs_filename = itdb_get_path (device_dir, "Preferences");
g_free (device_dir);
f = fopen (prefs_filename, "r");
if (f == NULL) {
g_print ("Couldn't open %s: %s\n", prefs_filename, g_strerror (errno));
g_free (prefs_filename);
return -1;
}
result = fseek (f, 0xB10, SEEK_SET);
if (result != 0) {
g_print ("Couldn't seek in %s: %s\n", prefs_filename,
g_strerror (errno));
fclose (f);
g_free (prefs_filename);
return -1;
}
result = fread (&timezone, sizeof (timezone), 1, f);
if (result != 1) {
g_print ("Couldn't read from %s: %s\n", prefs_filename,
g_strerror (errno));
fclose (f);
g_free (prefs_filename);
}
fclose (f);
g_free (prefs_filename);
timezone = GINT32_FROM_LE (timezone);
timezone -= GMT_OFFSET;
g_print ("Timezone: UTC%+d", timezone >> 1);
if (timezone & 1) {
g_print (" DST");
}
g_print ("\n");
return 0;
}
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