[FFmpeg-devel] [PATCH 1/8] libavdevice/v4l2.c: fix build warning

[Guo, Yejun]

Here is the warning message:
src/libavdevice/v4l2.c: In function ‘v4l2_get_device_list’:
src/libavdevice/v4l2.c:1054:58: warning: ‘%s’ directive output may be truncated writing up to 255 bytes into a region of size 251 [-Wformat-truncation=]
         snprintf(device_name, sizeof(device_name), "/dev/%s", entry->d_name);
                                                          ^~
src/libavdevice/v4l2.c:1054:9: note: ‘snprintf’ output between 6 and 261 bytes into a destination of size 256
         snprintf(device_name, sizeof(device_name), "/dev/%s", entry->d_name);
         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
---
This patch set fixes build warnings during make on my system
with gcc version 7.5.0 (Ubuntu 7.5.0-3ubuntu1~18.04)
with config option:
--disable-optimizations --enable-libx264 --enable-libx265 --enable-gpl --enable-libvpx --enable-libmfx --extra-cflags="-Wno-deprecated-declarations"

I also tried '-Wall -Werror', there are many many issues starting from
configure. It is a long term task, let's fix one by one when have time.

 libavdevice/v4l2.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavdevice/v4l2.c b/libavdevice/v4l2.c
index 365bacd771..15ade26eed 100644
--- a/libavdevice/v4l2.c
+++ b/libavdevice/v4l2.c
@@ -1046,7 +1046,7 @@ static int v4l2_get_device_list(AVFormatContext *ctx, AVDeviceInfoList *device_l
         return ret;
     }
     while ((entry = readdir(dir))) {
-        char device_name[256];
+        char device_name[261];
 
         if (!v4l2_is_v4l_dev(entry->d_name))
             continue;
-- 
2.17.1