[LEDE-DEV] [PATCH 2/7] firmware-tools/ptgen: do not truncate the output file

[John Crispin]

On 21/12/17 23:59, Michael Heimpold wrote:
> At the moment, the image file operated on is always truncated
> to 512 bytes. This limits the usage of ptgen somewhat.

O_TRUNC truncates to 0 and not 512 ?!

     John

>
> This change allows to use ptgen on existing, larger image files.
> In this case, only the partition table is written/updated while
> the rest of the image file is left alone.
>
> Signed-off-by: Michael Heimpold <mhei at heimpold.de>
> ---
>   tools/firmware-utils/src/ptgen.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/tools/firmware-utils/src/ptgen.c b/tools/firmware-utils/src/ptgen.c
> index 93d66eb..ff97cd5 100644
> --- a/tools/firmware-utils/src/ptgen.c
> +++ b/tools/firmware-utils/src/ptgen.c
> @@ -166,7 +166,7 @@ static int gen_ptable(uint32_t signature, int nr)
>   		printf("%ld\n", (long)len * 512);
>   	}
>   
> -	if ((fd = open(filename, O_WRONLY|O_CREAT|O_TRUNC, 0644)) < 0) {
> +	if ((fd = open(filename, O_WRONLY|O_CREAT, 0644)) < 0) {
>   		fprintf(stderr, "Can't open output file '%s'\n",filename);
>   		return -1;
>   	}