[FFmpeg-devel] [PATCH] cmdutils: replace strncpy() with equivalent memcpy()

[Andreas Rheinhardt]

Anton Khirnov:
> Fixes truncation warnings, such as
> warning: ‘strncpy’ output truncated before terminating nul copying 3 bytes from a string of the same length [-Wstringop-truncation]
> in gcc 10.2.0
> ---
>  fftools/cmdutils.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/fftools/cmdutils.c b/fftools/cmdutils.c
> index 8cfca22564..505006cd8b 100644
> --- a/fftools/cmdutils.c
> +++ b/fftools/cmdutils.c
> @@ -1163,13 +1163,13 @@ static void print_buildconf(int flags, int level)
>      // Change all the ' --' strings to '~--' so that
>      // they can be identified as tokens.
>      while ((conflist = strstr(str, " --")) != NULL) {
> -        strncpy(conflist, "~--", 3);
> +        memcpy(conflist, "~--", 3);
>      }
>  
>      // Compensate for the weirdness this would cause
>      // when passing 'pkg-config --static'.
>      while ((remove_tilde = strstr(str, "pkg-config~")) != NULL) {
> -        strncpy(remove_tilde, "pkg-config ", 11);
> +        memcpy(remove_tilde, "pkg-config ", 11);
>      }
>  
>      splitconf = strtok(str, "~");
> 
Wouldn't it be more natural to just use "conflist[0] = '~'" when
changing only one character?

- Andreas