liboping: fix format-truncation error

liboping.c: In function 'ping_host_add':
liboping.c:207:9: error: '%s' directive output may be truncated writing
up to 255 bytes into a region of size 243 [-Werror=format-truncation=]
    "%s: %s", function, message);
         ^~
liboping.c:1644:40:
    ping_set_error (obj, "getaddrinfo", errmsg);
                                        ~~~~~~
liboping.c:206:2: note: 'snprintf' output between 14 and 269 bytes into
a destination of size 256
  snprintf (obj->errmsg, sizeof (obj->errmsg),
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    "%s: %s", function, message);

Fixes:
 - http://autobuild.buildroot.org/results/b12d86388b495a96194e0bcbb5c19a4e35cbc53d

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

diff --git a/package/liboping/0001-ping_host_add-Decrease-buffer-size-to-make-GCC-s-truncation-check-happy.patch b/package/liboping/0001-ping_host_add-Decrease-buffer-size-to-make-GCC-s-truncation-check-happy.patch
new file mode 100644 (file)
index 0000000..b0aca8a
--- /dev/null
+++ b/package/liboping/0001-ping_host_add-Decrease-buffer-size-to-make-GCC-s-truncation-check-happy.patch
@@ -0,0 +1,31 @@
+From 18ca43507b351f339ff23062541ee8d58e813a53 Mon Sep 17 00:00:00 2001
+From: Florian Forster <ff@octo.it>
+Date: Sun, 29 Jul 2018 14:34:19 +0200
+Subject: [PATCH] ping_host_add: Decrease buffer size to make GCC's truncation
+ check happy.
+
+Fixes: #38
+Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+[Retrieved from:
+https://github.com/octo/liboping/commit/18ca43507b351f339ff23062541ee8d58e813a53]
+---
+ src/liboping.c | 6 ++----
+ 1 file changed, 2 insertions(+), 4 deletions(-)
+
+diff --git a/src/liboping.c b/src/liboping.c
+index 5253e8c..2470988 100644
+--- a/src/liboping.c
++++ b/src/liboping.c
+@@ -1636,10 +1636,8 @@ int ping_host_add (pingobj_t *obj, const char *host)
+               }
+               else
+               {
+-                      char errmsg[PING_ERRMSG_LEN];
+-
+-                      snprintf (errmsg, PING_ERRMSG_LEN, "Unknown `ai_family': %i", ai_ptr->ai_family);
+-                      errmsg[PING_ERRMSG_LEN - 1] = '\0';
++                      char errmsg[64];
++                      snprintf (errmsg, sizeof(errmsg), "Unknown `ai_family': %d", ai_ptr->ai_family);
+ 
+                       dprintf ("%s", errmsg);
+                       ping_set_error (obj, "getaddrinfo", errmsg);