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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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57
src/ucm/parser.c
View file

@ -193,6 +193,49 @@ int parse_get_safe_id(snd_config_t *n, const char **id)
return 0;
}
/*
* Evaluate variable definitions (in-place delete)
*/
static int evaluate_define(snd_use_case_mgr_t *uc_mgr,
snd_config_t *cfg)
{
snd_config_iterator_t i, next;
snd_config_t *d, *n;
const char *id;
char *var, *s;
int err;
err = snd_config_search(cfg, "Define", &d);
if (err == -ENOENT)
return 1;
if (err < 0)
return err;
if (snd_config_get_type(d) != SND_CONFIG_TYPE_COMPOUND) {
uc_error("compound type expected for Define");
return -EINVAL;
}
snd_config_for_each(i, next, d) {
n = snd_config_iterator_entry(i);
err = snd_config_get_id(n, &id);
if (err < 0)
return err;
err = snd_config_get_ascii(n, &var);
if (err < 0)
return err;
err = uc_mgr_get_substituted_value(uc_mgr, &s, var);
free(var);
if (err < 0)
return err;
uc_mgr_set_variable(uc_mgr, id, s);
free(s);
}
snd_config_delete(d);
return 0;
}
/*
* Evaluate include (in-place)
*/
@ -239,16 +282,20 @@ static int evaluate_condition(snd_use_case_mgr_t *uc_mgr,
int uc_mgr_evaluate_inplace(snd_use_case_mgr_t *uc_mgr,
snd_config_t *cfg)
{
int err1 = 0, err2 = 0;
int err1 = 0, err2 = 0, err3 = 0;
while (err1 == 0 || err2 == 0) {
/* include at first */
err1 = evaluate_include(uc_mgr, cfg);
while (err1 == 0 || err2 == 0 || err3 == 0) {
/* variables at first */
err1 = evaluate_define(uc_mgr, cfg);
if (err1 < 0)
return err1;
err2 = evaluate_condition(uc_mgr, cfg);
/* include at second */
err2 = evaluate_include(uc_mgr, cfg);
if (err2 < 0)
return err2;
err3 = evaluate_condition(uc_mgr, cfg);
if (err3 < 0)
return err3;
}
return 0;
}