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videomodes: Add helper functions to parse video-mode env-var extra options 

Add 2 helper functions to get strings, respectively integers from the options
value returned by video_get_video_mode() / video_get_ctfb_res_modes().

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Anatolij Gustschin <agust@denx.de>
This commit is contained in:
Hans de Goede 2014-12-19 14:27:46 +01:00
parent e976b868f2
commit eb3c0cf806
2 changed files with 64 additions and 1 deletions
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60
drivers/video/videomodes.c
View File

@ -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)) {
@ -315,3 +315,61 @@ 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 ',' separated options string, and
* store its value in dest.
*
* @options: ',' separated 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 ',' separated options string, and
* return its value.
*
* @options: ',' separated 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;
}

5
drivers/video/videomodes.h
View File

@ -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);