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More gracefully bail out on a missing timzeone file

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This commit is contained in:
Erik Hofman 2021-03-13 13:09:59 +01:00
parent 1ea11d987e
commit 508a511070
2 changed files with 16 additions and 10 deletions
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16
simgear/timing/lowleveltime.cxx
View File

@ -124,7 +124,7 @@ static int fgcompute_change(fgtz_rule *rule, int year);
static struct ttinfo *fgfind_transition (time_t timer);
static void fgcompute_tzname_max (size_t chars);
static inline int decode (const void *ptr);
void fgtzfile_read (const char *file);
bool fgtzfile_read (const char *file);
static void offtime (const time_t *t, long int offset, struct tm *tp);
static char *tzstring (const char* string);
@ -327,8 +327,7 @@ static void fgtzset_internal (int always, const char *tz)
old_fgtz = tz ? strdup (tz) : NULL;
/* Try to read a data file. */
fgtzfile_read (tz);
if (use_fgtzfile)
if (fgtzfile_read(tz) && use_fgtzfile)
return;
// The default behaviour of the original tzset_internal (int always, char* tz)
// function is to set up a default timezone, in any case file_read() fails
@ -785,7 +784,7 @@ static struct ttinfo * fgfind_transition (time_t timer)
/**************************************************************************/
void fgtzfile_read (const char *file)
bool fgtzfile_read (const char *file)
{
// static const char default_tzdir[] = TZDIR;
size_t num_isstd, num_isgmt;
@ -818,7 +817,7 @@ void fgtzfile_read (const char *file)
file = TZDEFAULT;
else if (*file == '\0')
/* User specified the empty string; use UTC with no leap seconds. */
return;
return true;
else
{
/* We must not allow to read an arbitrary file in a setuid
@ -866,9 +865,9 @@ void fgtzfile_read (const char *file)
#endif
if (f == NULL) {
perror( "fgtzfile_read(): " );
// perror( "fgtzfile_read(): " );
errno = 0;
return;
return false;
}
if (fread ((void *) &tzhead, sizeof (tzhead), 1, f) != 1)
@ -991,10 +990,11 @@ void fgtzfile_read (const char *file)
fgcompute_tzname_max (chars);
use_fgtzfile = 1;
return;
return true;
lose:;
fclose(f);
return false;
}
/****************************************************************************/

10
simgear/timing/sg_time.cxx
View File

@ -241,10 +241,16 @@ void SGTime::updateLocal( const SGGeod& aLocation, const SGPath& root ) {
currGMT = sgTimeGetGMT( gmtime(&cur_time) );
std::string zs = zone.utf8Str();
aircraftLocalTime = sgTimeGetGMT( (fgLocaltime(&cur_time, zs.c_str())) );
local_offset = aircraftLocalTime - currGMT;
struct tm *local_time = fgLocaltime(&cur_time, zs.c_str());
if (local_time) {
aircraftLocalTime = sgTimeGetGMT( local_time );
local_offset = aircraftLocalTime - currGMT;
// cout << "Using " << local_offset << " as local time offset Timezone is "
// << zonename << endl;
}
else {
SG_LOG( SG_EVENT, SG_ALERT, "Timezone file not found: " << zs );
}
}