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ucm: configuration - allow to define the configuration variables

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It may be useful for the library files to use the runtime configuration
variables.

Example:

 Define.Var1 "hw:${CardId},2"
 Value.PlaybackPCM "${var:Var1}"

Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Jaroslav Kysela 2020-05-20 19:04:36 +02:00
parent 6cc6024ac5
commit ed4567d1c9
5 changed files with 130 additions and 5 deletions
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16
src/ucm/ucm_subs.c
View file

@ -167,6 +167,21 @@ static char *rval_sysfs(snd_use_case_mgr_t *uc_mgr ATTRIBUTE_UNUSED, const char
return strdup(path);
}
static char *rval_var(snd_use_case_mgr_t *uc_mgr, const char *id)
{
const char *v;
if (uc_mgr->conf_format < 3) {
uc_error("variable substitution is supported in v3+ syntax");
return NULL;
}
v = uc_mgr_get_variable(uc_mgr, id);
if (v)
return strdup(v);
return NULL;
}
#define MATCH_VARIABLE(name, id, fcn, empty_ok) \
if (strncmp((name), (id), sizeof(id) - 1) == 0) { \
rval = fcn(uc_mgr); \
@ -224,6 +239,7 @@ int uc_mgr_get_substituted_value(snd_use_case_mgr_t *uc_mgr,
MATCH_VARIABLE(value, "${CardComponents}", rval_card_components, true);
MATCH_VARIABLE2(value, "${env:", rval_env);
MATCH_VARIABLE2(value, "${sys:", rval_sysfs);
MATCH_VARIABLE2(value, "${var:", rval_var);
err = -EINVAL;
tmp = strchr(value, '}');
if (tmp) {