From: Rich Felker <dalias@aerifal.cx>
Date: Wed, 21 Jun 2017 00:31:35 +0000 (-0400)
Subject: handle errors from localtime_r in ctime_r
X-Git-Url: http://nsz.repo.hu/git/?a=commitdiff_plain;h=64f855874c32e192382df69f4765a7e32057a005;p=musl

handle errors from localtime_r in ctime_r

POSIX requires ctime_r return a null pointer on failure, which can
occur if the input time_t value is not representable in broken down
form.

based on patch by Alexander Monakov.
---

diff --git a/src/time/ctime_r.c b/src/time/ctime_r.c
index d2260a16..3e24aa68 100644
--- a/src/time/ctime_r.c
+++ b/src/time/ctime_r.c
@@ -2,7 +2,6 @@
 
 char *ctime_r(const time_t *t, char *buf)
 {
-	struct tm tm;
-	localtime_r(t, &tm);
-	return asctime_r(&tm, buf);
+	struct tm tm, *tm_p = localtime_r(t, &tm);
+	return tm_p ? asctime_r(tm_p, buf) : 0;
 }