1 #include <time.h>
2 #include <stdio.h>
3 #include <langinfo.h>
4 #include "locale_impl.h"
5 #include "atomic.h"
6 7 char *__asctime_r(const struct tm *restrict tm, char *restrict buf)
8 {
9 if (snprintf(buf, 26, "%.3s %.3s%3d %.2d:%.2d:%.2d %d\n",
10 __nl_langinfo_l(ABDAY_1+tm->tm_wday, C_LOCALE),
11 __nl_langinfo_l(ABMON_1+tm->tm_mon, C_LOCALE),
12 tm->tm_mday, tm->tm_hour,
13 tm->tm_min, tm->tm_sec,
14 1900 + tm->tm_year) >= 26)
15 {
16 /* ISO C requires us to use the above format string,
17 * even if it will not fit in the buffer. Thus asctime_r
18 * is _supposed_ to crash if the fields in tm are too large.
19 * We follow this behavior and crash "gracefully" to warn
20 * application developers that they may not be so lucky
21 * on other implementations (e.g. stack smashing..).
22 */
23 a_crash();
24 }
25 return buf;
26 }
27 28 weak_alias(__asctime_r, asctime_r);
29