#include "time_impl.h"
#include <errno.h>
#include <limits.h>

struct tm *__localtime_r(const time_t *restrict t, struct tm *restrict tm)
{
	/* Unlike other musl targets emscripten uses `int` for time_t rather than
	 * `int64`, so these checks don't apply (they rightly trigger
	 * `autological-constant-out-of-range-compare` warnings).
	 * TODO(sbc): Remove this if/when we switch to using int64 too. */
#ifndef __EMSCRIPTEN__
	/* Reject time_t values whose year would overflow int because
	 * __secs_to_zone cannot safely handle them. */
	if (*t < INT_MIN * 31622400LL || *t > INT_MAX * 31622400LL) {
		errno = EOVERFLOW;
		return 0;
	}
#endif
	__secs_to_zone(*t, 0, &tm->tm_isdst, &tm->__tm_gmtoff, 0, &tm->__tm_zone);
	if (__secs_to_tm((long long)*t + tm->__tm_gmtoff, tm) < 0) {
		errno = EOVERFLOW;
		return 0;
	}
	return tm;
}

weak_alias(__localtime_r, localtime_r);