fusl/src/time/localtime_r.c

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

struct tm* __localtime_r(const time_t* restrict t, struct tm* restrict tm) {
  /* 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;
  }
  __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);