Hello, can you review my patch below?
On Thursday 12 April 2018 20:52:21 Pali Rohár wrote:
> Function strtod() sets strtod_error to the pointer of the first invalid
> character and therefore it does not have to be first character from input.
> When input is valid then it points to nul byte. Conversion error is
> indicated by setted errno. Zero-length argument and zero DPI is invalid
> too.
>
> Update also error message about invalid argument.
>
> Signed-off-by: Pali Rohár <pali.ro...@gmail.com>
> ---
> xrandr.c | 7 ++++---
> 1 file changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/xrandr.c b/xrandr.c
> index 7f1e867..1960bbf 100644
> --- a/xrandr.c
> +++ b/xrandr.c
> @@ -3115,9 +3115,10 @@ main (int argc, char **argv)
> }
> if (!strcmp ("--dpi", argv[i])) {
> char *strtod_error;
> - if (++i >= argc) argerr ("%s requires an argument\n", argv[i-1]);
> + if (++i >= argc || !argv[i][0]) argerr ("%s requires an
> argument\n", argv[i-1]);
> + errno = 0;
> dpi = strtod(argv[i], &strtod_error);
> - if (argv[i] == strtod_error)
> + if (*strtod_error || errno || dpi == 0)
> {
> dpi = 0.0;
> dpi_output_name = argv[i];
> @@ -3567,7 +3568,7 @@ main (int argc, char **argv)
> XRROutputInfo *output_info;
> XRRModeInfo *mode_info;
> if (!dpi_output)
> - fatal ("Cannot find output %s\n", dpi_output_name);
> + fatal ("%s is not valid DPI nor valid output\n",
> dpi_output_name);
> output_info = dpi_output->output_info;
> mode_info = dpi_output->mode_info;
> if (output_info && mode_info && output_info->mm_height)-- Pali Rohár pali.ro...@gmail.com
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