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ucm: allow passing variables through ucm open string

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It is useful to pass information like application capabilities
to the UCM configuration parser. Those variables are prefixed
with '@' for the configuration files.

An example:

   "<<<v1='a b c',x=12>>>hw:1"

Variables can substituted in the configuration:

   "${var:@v1}" -> "a b c"
   "${var:@x}" -> 12

Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Jaroslav Kysela 2022-05-16 13:16:01 +02:00
parent 46e991c9ce
commit 11ec9e497e
2 changed files with 63 additions and 0 deletions
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9
src/ucm/parser.c
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@ -278,6 +278,10 @@ static int evaluate_regex(snd_use_case_mgr_t *uc_mgr,
err = snd_config_get_id(n, &id);
if (err < 0)
return err;
if (id[0] == '@') {
uc_error("error: value names starting with '@' are reserved for application variables");
return -EINVAL;
}
err = uc_mgr_define_regex(uc_mgr, id, n);
if (err < 0)
return err;
@ -327,6 +331,11 @@ static int evaluate_define(snd_use_case_mgr_t *uc_mgr,
free(var);
if (err < 0)
return err;
if (id[0] == '@') {
free(s);
uc_error("error: value names starting with '@' are reserved for application variables");
return -EINVAL;
}
err = uc_mgr_set_variable(uc_mgr, id, s);
free(s);
if (err < 0)