1 files changed, 28 insertions, 0 deletions
diff --git a/src/time/asctime_r.c b/src/time/asctime_r.c
new file mode 100644
index 0000000..26809ca
--- /dev/null
+++ b/src/time/asctime_r.c
@@ -0,0 +1,28 @@
+#include <time.h>
+#include <stdio.h>
+#include <langinfo.h>
+#include "locale_impl.h"
+#include "atomic.h"
+
+char *__asctime_r(const struct tm *restrict tm, char *restrict buf)
+{
+	if (snprintf(buf, 26, "%.3s %.3s%3d %.2d:%.2d:%.2d %d\n",
+		__nl_langinfo_l(ABDAY_1+tm->tm_wday, C_LOCALE),
+		__nl_langinfo_l(ABMON_1+tm->tm_mon, C_LOCALE),
+		tm->tm_mday, tm->tm_hour,
+		tm->tm_min, tm->tm_sec,
+		1900 + tm->tm_year) >= 26)
+	{
+		/* ISO C requires us to use the above format string,
+		 * even if it will not fit in the buffer. Thus asctime_r
+		 * is _supposed_ to crash if the fields in tm are too large.
+		 * We follow this behavior and crash "gracefully" to warn
+		 * application developers that they may not be so lucky
+		 * on other implementations (e.g. stack smashing..).
+		 */
+		a_crash();
+	}
+	return buf;
+}
+
+weak_alias(__asctime_r, asctime_r);