1#include <langinfo.h>
2#include <stdio.h>
3#include <time.h>
4
5const char* __nl_langinfo(nl_item);
6
7char* __asctime(const struct tm* restrict tm, char* restrict buf) {
8    /* FIXME: change __nl_langinfo to __nl_langinfo_l with explicit C
9     * locale once we have locales */
10    if (snprintf(buf, 26, "%.3s %.3s%3d %.2d:%.2d:%.2d %d\n", __nl_langinfo(ABDAY_1 + tm->tm_wday),
11                 __nl_langinfo(ABMON_1 + tm->tm_mon), tm->tm_mday, tm->tm_hour, tm->tm_min,
12                 tm->tm_sec, 1900 + tm->tm_year) >= 26) {
13        /* ISO C requires us to use the above format string,
14         * even if it will not fit in the buffer. Thus asctime_r
15         * is _supposed_ to crash if the fields in tm are too large.
16         * We follow this behavior and crash "gracefully" to warn
17         * application developers that they may not be so lucky
18         * on other implementations (e.g. stack smashing..).
19         */
20        __builtin_trap();
21    }
22    return buf;
23}
24