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mixer: simple - add snd_mixer_selem_id_parse() from amixer

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Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Jaroslav Kysela 2019-11-11 14:22:11 +01:00
parent 1b14643384
commit 4ce38a5ff4
2 changed files with 54 additions and 0 deletions
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1
include/mixer.h
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@ -304,6 +304,7 @@ const char *snd_mixer_selem_id_get_name(const snd_mixer_selem_id_t *obj);
unsigned int snd_mixer_selem_id_get_index(const snd_mixer_selem_id_t *obj);
void snd_mixer_selem_id_set_name(snd_mixer_selem_id_t *obj, const char *val);
void snd_mixer_selem_id_set_index(snd_mixer_selem_id_t *obj, unsigned int val);
int snd_mixer_selem_id_parse(snd_mixer_selem_id_t *dst, const char *str);
/** \} */

53
src/mixer/simple.c
View file

@ -1052,3 +1052,56 @@ void snd_mixer_selem_id_set_index(snd_mixer_selem_id_t *obj, unsigned int val)
assert(obj);
obj->index = val;
}
/**
* \brief Parse ASCII simple mixer element identifier
* \param dst Parsed simple mixer element identifier
* \param str Mixer simple element ASCII representation
*/
int snd_mixer_selem_id_parse(snd_mixer_selem_id_t *dst, const char *str)
{
int c, size;
char buf[128];
char *ptr = buf;
memset(dst, 0, sizeof(*dst));
while (*str == ' ' || *str == '\t')
str++;
if (!(*str))
return -EINVAL;
size = 1; /* for '\0' */
if (*str != '"' && *str != '\'') {
while (*str && *str != ',') {
if (size < (int)sizeof(buf)) {
*ptr++ = *str;
size++;
}
str++;
}
} else {
c = *str++;
while (*str && *str != c) {
if (size < (int)sizeof(buf)) {
*ptr++ = *str;
size++;
}
str++;
}
if (*str == c)
str++;
}
if (*str == '\0') {
*ptr = 0;
goto _set;
}
if (*str != ',')
return -EINVAL;
*ptr = 0; /* terminate the string */
str++;
if (str[0] < '0' || str[1] > '9')
return -EINVAL;
dst->index = atoi(str);
_set:
snd_strlcpy(dst->name, buf, sizeof(dst->name));
return 0;
}