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| author | Jaroslav Kysela <perex@perex.cz> | 2022-05-17 14:35:51 +0200 |
|---|---|---|
| committer | Jaroslav Kysela <perex@perex.cz> | 2022-05-17 14:36:03 +0200 |
| commit | 5062565e824f02c9838bd781862a9396c52d4111 (patch) | |
| tree | 696baa44b2d8166ca08349d7d3209c398fbb6be2 | |
| parent | 11ec9e497ee542dc987ab191abee16440336bfe4 (diff) | |
| download | alsa-lib-5062565e824f02c9838bd781862a9396c52d4111.tar.gz | |
ucm: allow '-' prefix to avoid errors when the variable is not defined
It may be useful to check if variable is not defined.
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
| -rw-r--r-- | src/ucm/ucm_subs.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/src/ucm/ucm_subs.c b/src/ucm/ucm_subs.c index 8b42b889..a7d79430 100644 --- a/src/ucm/ucm_subs.c +++ b/src/ucm/ucm_subs.c @@ -549,13 +549,20 @@ static char *rval_sysfs(snd_use_case_mgr_t *uc_mgr ATTRIBUTE_UNUSED, const char static char *rval_var(snd_use_case_mgr_t *uc_mgr, const char *id) { const char *v; + bool ignore_not_found = false; if (uc_mgr->conf_format < 3) { uc_error("variable substitution is supported in v3+ syntax"); return NULL; } + if (id[0] == '-') { + ignore_not_found = true; + id++; + } v = uc_mgr_get_variable(uc_mgr, id); + if (v == NULL && ignore_not_found) + v = ""; if (v) return strdup(v); return NULL; |