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Implement gnc_timegm directly without mktime.

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Calculate the seconds since the start of the UNIX epoch directly without
the help of mktime. This also works on Windows. Systems with timegm are
unaffected.


git-svn-id: svn+ssh://svn.gnucash.org/repo/gnucash/trunk@15472 57a11ea4-9604-0410-9ed3-97b8803252fd
This commit is contained in:
Andreas Köhler 2007-01-31 00:05:23 +00:00
parent a23e280d8d
commit f81aa515fd
1 changed files with 25 additions and 24 deletions
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49
src/backend/file/sixtp-utils.c
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@ -381,35 +381,36 @@ simple_chars_only_parser_new(sixtp_end_handler end_handler)
#ifdef HAVE_TIMEGM
# define gnc_timegm timegm
#else
#else /* !HAVE_TIMEGM */
/* This code originates from GLib 2.12, gtimer.c and works until the year 2100
* or the system-dependent maximal date that can be represented by a time_t,
* whatever comes first. The old implementation called mktime after setting
* the environment variable TZ to UTC. It did not work on Windows, at least.
*/
static const gint days_before[] = {
0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334
};
static time_t
gnc_timegm (struct tm *tm)
{
time_t result;
char *old_tz;
time_t retval;
if (tm->tm_mon < 0 || tm->tm_mon > 11)
return (time_t) -1;
old_tz = g_strdup(g_getenv ("TZ"));
/* FIXME: there's no way to report this error to the caller. */
if (!g_setenv("TZ", "UTC", TRUE))
PERR ("couldn't switch the TZ.");
result = mktime (tm);
if(old_tz)
{
/* FIXME: there's no way to report this error to the caller. */
if (!g_setenv("TZ", old_tz, TRUE))
PERR ("couldn't switch the TZ back.");
g_free(old_tz);
retval = (tm->tm_year - 70) * 365;
retval += (tm->tm_year - 68) / 4;
retval += days_before[tm->tm_mon] + tm->tm_mday - 1;
if (tm->tm_year % 4 == 0 && tm->tm_mon < 2)
retval -= 1;
retval = ((((retval * 24) + tm->tm_hour) * 60) + tm->tm_min) * 60 + tm->tm_sec;
return retval;
}
else
{
/* FIXME: there's no way to report this error to the caller. */
g_unsetenv("TZ");
if(errno != 0)
PERR ("couldn't restore the TZ to undefined.");
}
return result;
}
#endif
#endif /* HAVE_TIMEGM */
/****************************************************************************/