conf: accept '_' character in the variable name

Fixes: https://github.com/alsa-project/alsa-lib/issues/197
Signed-off-by: Jaroslav Kysela <perex@perex.cz>

diff --git a/src/confeval.c b/src/confeval.c
index a971bf3872ed4b2d973ab92e530bb4cf55e05736..be9ac8747750494cfd3ffba899c2261f2892e9de 100644 (file)
--- a/src/confeval.c
+++ b/src/confeval.c
@@ -190,7 +190,7 @@ int _snd_eval_string(snd_config_t **dst, const char *s,
                        } else {
                                e = s + 1;
                                while (*e) {
-                                       if (!isalnum(*e))
+                                       if (!isalnum(*e) && *e != '_')
                                                break;
                                        e++;
                                }