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conf: fix the device parsing when arguments has no defaults

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The commit bf528b90 sets the value to an empty string which causes
these errors:

   pcm_hw.c: Invalid type for device
   pcm_hw.c: Invalid type for subdevice

When device arguments (@args) have no default values set,
the field must be skipped to keep the compatibility.

BugLink: https://gitlab.freedesktop.org/pulseaudio/pulseaudio/-/issues/1246
Fixes: https://github.com/alsa-project/alsa-lib/issues/199
Fixes: bf528b90 ("conf: add possibility to evaluate simple integer math expressions")
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Jaroslav Kysela 2021-12-09 10:15:29 +01:00
parent f44c94f24c
commit 4b22871ee5
2 changed files with 11 additions and 2 deletions
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8
src/conf.c
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@ -4994,8 +4994,10 @@ int snd_config_copy(snd_config_t **dst,
static int _snd_config_expand_vars(snd_config_t **dst, const char *s, void *private_data)
{
snd_config_t *val, *vars = private_data;
if (snd_config_search(vars, s, &val) < 0)
return snd_config_make_string(dst, "");
if (snd_config_search(vars, s, &val) < 0) {
*dst = NULL;
return 0;
}
return snd_config_copy(dst, val);
}
@ -5060,6 +5062,8 @@ static int _snd_config_expand(snd_config_t *src,
err = snd_config_evaluate_string(dst, s, fcn, vars);
if (err < 0)
return err;
if (*dst == NULL)
return 0;
err = snd_config_set_id(*dst, id);
if (err < 0) {
snd_config_delete(*dst);