[U-Boot] [PATCH v2 05/11] videomodes: Add helper functions to parse video-mode env-var extra options

[Ian Campbell <ijc@hellion.org.uk>]

On Fri, 2014-12-19 at 18:10 +0100, Hans de Goede wrote:
> Add 2 helper functions to get strings, reps. ints from the options value
> returned by video_get_video_mode() / video_get_ctfb_res_modes().

I can't quite parse this, what is "reps. ints"?

Also, it's "separated" not "seperated" (throughout).

> 
> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
> ---
>  drivers/video/videomodes.c | 60 +++++++++++++++++++++++++++++++++++++++++++++-
>  drivers/video/videomodes.h |  5 ++++
>  2 files changed, 64 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/video/videomodes.c b/drivers/video/videomodes.c
> index 72841fd..1f79d5f 100644
> --- a/drivers/video/videomodes.c
> +++ b/drivers/video/videomodes.c
> @@ -113,7 +113,7 @@ const struct ctfb_res_modes res_mode_init[RES_MODES_COUNT] = {
>   * returns the length to the next seperator
>   */
>  static int
> -video_get_param_len (char *start, char sep)
> +video_get_param_len (const char *start, char sep)
>  {
>  	int i = 0;
>  	while ((*start != 0) && (*start != sep)) {
> @@ -313,3 +313,61 @@ void video_get_ctfb_res_modes(int default_mode, unsigned int default_depth,
>  	       xres, yres, depth, refresh, (*mode_ret)->xres,
>  	       (*mode_ret)->yres, *depth_ret, (*mode_ret)->refresh);
>  }
> +
> +/*
> + * Find the named string option within the ',' seperated options string, and
> + * store its value in dest.
> + *
> + * @options: ',' seperated options string
> + * @name: name of the option to look for
> + * @dest: destination buffer to store the value of the option in
> + * @dest_len: length of dest
> + * @def: value to store in dest if the option is not present in options
> + */
> +void video_get_option_string(const char *options, const char *name,
> +			     char *dest, int dest_len, const char *def)
> +{
> +	const char *p = options;
> +	const int name_len = strlen(name);
> +	int i, len;
> +
> +	while (p && (i = video_get_param_len (p, ',')) != 0) {
> +		if (strncmp(p, name, name_len) == 0 && p[name_len] == '=') {
> +			len = i - (name_len + 1);
> +			if (len >= dest_len)
> +				len = dest_len - 1;
> +			memcpy(dest, &p[name_len + 1], len);
> +			dest[len] = 0;
> +			return;
> +		}
> +		p += i;
> +		if (*p != 0)
> +			p++;	/* skip ',' */
> +	}
> +	strcpy(dest, def);
> +}
> +
> +/*
> + * Find the named integer option within the ',' seperated options string, and
> + * return its value.
> + *
> + * @options: ',' seperated options string
> + * @name: name of the option to look for
> + * @def: value to return if the option is not present in options
> + */
> +int video_get_option_int(const char *options, const char *name, int def)
> +{
> +	const char *p = options;
> +	const int name_len = strlen(name);
> +	int i;
> +
> +	while (p && (i = video_get_param_len (p, ',')) != 0) {
> +		if (strncmp(p, name, name_len) == 0 && p[name_len] == '=')
> +			return simple_strtoul(&p[name_len + 1], NULL, 10);
> +
> +		p += i;
> +		if (*p != 0)
> +			p++;	/* skip ',' */
> +	}
> +	return def;
> +}
> diff --git a/drivers/video/videomodes.h b/drivers/video/videomodes.h
> index 02419cd..047b8a9 100644
> --- a/drivers/video/videomodes.h
> +++ b/drivers/video/videomodes.h
> @@ -84,3 +84,8 @@ void video_get_ctfb_res_modes(int default_mode, unsigned int default_depth,
>  			      const struct ctfb_res_modes **mode_ret,
>  			      unsigned int *depth_ret,
>  			      const char **options);
> +
> +void video_get_option_string(const char *options, const char *name,
> +			     char *dest, int dest_len, const char *def);
> +
> +int video_get_option_int(const char *options, const char *name, int def);