ppc: add configure check for older compilers erroring on 'd' constraint

[musl] / src / time / asctime_r.c

diff --git a/src/time/asctime_r.c b/src/time/asctime_r.c
index e51b880..26809ca 100644 (file)
--- a/src/time/asctime_r.c
+++ b/src/time/asctime_r.c
@@ -1,8 +1,28 @@
 #include <time.h>
+#include <stdio.h>
+#include <langinfo.h>
+#include "locale_impl.h"
+#include "atomic.h"
 
-char *__asctime(const struct tm *, char *);
-
-char *asctime_r(const struct tm *tm, char *buf)
+char *__asctime_r(const struct tm *restrict tm, char *restrict buf)
 {
-       return __asctime(tm, 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);