localtime_r.c raw

   1  #include "time_impl.h"
   2  #include <errno.h>
   3  #include <limits.h>
   4  
   5  struct tm *__localtime_r(const time_t *restrict t, struct tm *restrict tm)
   6  {
   7  	/* Reject time_t values whose year would overflow int because
   8  	 * __secs_to_zone cannot safely handle them. */
   9  	if (*t < INT_MIN * 31622400LL || *t > INT_MAX * 31622400LL) {
  10  		errno = EOVERFLOW;
  11  		return 0;
  12  	}
  13  	__secs_to_zone(*t, 0, &tm->tm_isdst, &tm->__tm_gmtoff, 0, &tm->__tm_zone);
  14  	if (__secs_to_tm((long long)*t + tm->__tm_gmtoff, tm) < 0) {
  15  		errno = EOVERFLOW;
  16  		return 0;
  17  	}
  18  	return tm;
  19  }
  20  
  21  weak_alias(__localtime_r, localtime_r);
  22