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#include <time.h>
#include <stdlib.h>
/* timegm -- based on Linux timegm man page */
time_t
timegm(struct tm *tm)
{
time_t ret;
char *tz = getenv("TZ");
const char *tzreq = "UTC+0"; /* more portable than ""? */
if (tz)
tz = estrdup(tz, strlen(tz));
if (setenv("TZ", tzreq, 1) < 0) {
warning(_("setenv(TZ, %s) failed (%s)"), tzreq, strerror(errno));
return -1;
}
tzset();
ret = mktime(tm);
if (tz) {
if (setenv("TZ", tz, 1) < 0)
fatal(_("setenv(TZ, %s) restoration failed (%s)"), tz, strerror(errno));
free(tz);
} else {
if (unsetenv("TZ") < 0)
fatal(_("unsetenv(TZ) failed (%s)"), strerror(errno));
}
tzset();
return ret;
}
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