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-rw-r--r--src/time/__asctime.c27
1 files changed, 27 insertions, 0 deletions
diff --git a/src/time/__asctime.c b/src/time/__asctime.c
new file mode 100644
index 00000000..18535802
--- /dev/null
+++ b/src/time/__asctime.c
@@ -0,0 +1,27 @@
+#include <time.h>
+#include <stdio.h>
+#include <langinfo.h>
+
+const char *__langinfo(nl_item);
+
+char *__asctime(const struct tm *tm, char *buf)
+{
+ /* FIXME: change __langinfo to __C_langinfo once we have locales */
+ if (snprintf(buf, 26, "%.3s %.3s%3d %.2d:%.2d:%.2d %d\n",
+ __langinfo(ABDAY_1+tm->tm_wday),
+ __langinfo(ABMON_1+tm->tm_mon),
+ 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..).
+ */
+ *(int*)0 = 0;
+ }
+ return buf;
+}