github.com/afumu/libc@v0.0.6/musl/src/time/localtime_r.c (about)

     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);