[v1,1/1] mkimage: Fix error message if write less data then expected

Add a new error message in case the size of data written
are shorter than the one expected.

Currently, it will lead to the following error message:
   "mkimage: Write error on uImage: Success"

This is not explicit when the error is because the device
doesn't have enough space. Let's use a "No space left on
the device" error message in that case.

Signed-off-by: Myl?ne Josserand <mylene.josserand at collabora.com>
---
 tools/mkimage.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

Hi Mylene,

Thanks for you patch.

On 5/6/20 05:01, Myl?ne Josserand wrote:
> Add a new error message in case the size of data written
> are shorter than the one expected.
>
> Currently, it will lead to the following error message:
>     "mkimage: Write error on uImage: Success"
>
> This is not explicit when the error is because the device
> doesn't have enough space. Let's use a "No space left on
> the device" error message in that case.
>
> Signed-off-by: Myl?ne Josserand <mylene.josserand at collabora.com>
> ---
>   tools/mkimage.c | 14 ++++++++++----
>   1 file changed, 10 insertions(+), 4 deletions(-)
>
> diff --git a/tools/mkimage.c b/tools/mkimage.c
> index d2cd1917874..ef0cc889a92 100644
> --- a/tools/mkimage.c
> +++ b/tools/mkimage.c
> @@ -674,7 +674,7 @@ copy_file (int ifd, const char *datafile, int pad)
>   	int zero = 0;
>   	uint8_t zeros[4096];
>   	int offset = 0;
> -	int size;
> +	int size, ret;
>   	struct image_type_params *tparams = imagetool_get_type(params.type);
>   
>   	memset(zeros, 0, sizeof(zeros));
> @@ -730,9 +730,15 @@ copy_file (int ifd, const char *datafile, int pad)
>   	}
>   
>   	size = sbuf.st_size - offset;
> -	if (write(ifd, ptr + offset, size) != size) {
> -		fprintf (stderr, "%s: Write error on %s: %s\n",
> -			params.cmdname, params.imagefile, strerror(errno));
> +
> +	ret = write(ifd, ptr + offset, size);
> +	if (ret != size) {
> +		if (ret < 0)
> +			fprintf (stderr, "%s: Write error on %s: %s\n",
> +				 params.cmdname, params.imagefile, strerror(errno));
> +		else if (ret < size)
> +			fprintf (stderr, "%s: No space left on the device\n",
> +				 params.cmdname);


Thanks for improving the error message, it is much more clear now. The 
only question I have is if "no space left on the device" is the only 
possible cause for this situation, for sure it is the most probable.

>   		exit (EXIT_FAILURE);
>   	}
>   


Regards,

Walter