[PATCH v3 4/6] conf-parser: Add pa_config_parse_volume()

[tanu.kaskinen@xxxxxxxxxxxxxxx (Tanu Kaskinen)]

This will be used to parse the path default volume in the alsa mixer
configuration files. For now, percentages are the only supported
format, because I don't have need for anything else, but we can of
course add more volume formats later as needed.
---
 src/pulsecore/conf-parser.c | 23 +++++++++++++++++++++++
 src/pulsecore/conf-parser.h |  3 ++-
 2 files changed, 25 insertions(+), 1 deletion(-)

diff --git a/src/pulsecore/conf-parser.c b/src/pulsecore/conf-parser.c
index 2dcd45a..7ec50fc 100644
--- a/src/pulsecore/conf-parser.c
+++ b/src/pulsecore/conf-parser.c
@@ -312,3 +312,26 @@ int pa_config_parse_string(pa_config_parser_state *state) {
     *s = *state->rvalue ? pa_xstrdup(state->rvalue) : NULL;
     return 0;
 }
+
+int pa_config_parse_volume(pa_config_parser_state *state) {
+    size_t len;
+
+    pa_assert(state);
+
+    len = strlen(state->rvalue);
+
+    /* Only allow volumes in percentage format. This limitation can be lifted
+     * if necessary, it's currently done this way to make documentation
+     * easier for the users of pa_config_parse_volume(). */
+    if (len == 0 || state->rvalue[len - 1] != '%')
+        goto fail;
+
+    if (pa_parse_volume(state->rvalue, state->data) < 0)
+        goto fail;
+
+    return 0;
+
+fail:
+    pa_log("[%s:%u] Failed to parse volume value: \"%s\"", state->filename, state->lineno, state->rvalue);
+    return -1;
+}
diff --git a/src/pulsecore/conf-parser.h b/src/pulsecore/conf-parser.h
index dbb6f5c..62d7046 100644
--- a/src/pulsecore/conf-parser.h
+++ b/src/pulsecore/conf-parser.h
@@ -70,12 +70,13 @@ struct pa_config_parser_state {
  * are not allowed at all in the configuration file. */
 int pa_config_parse(const char *filename, FILE *f, const pa_config_item *t, pa_proplist *proplist, void *userdata);
 
-/* Generic parsers for integers, size_t, booleans and strings */
+/* Generic parsers for integers, size_t, booleans, strings and pa_volume_t */
 int pa_config_parse_int(pa_config_parser_state *state);
 int pa_config_parse_unsigned(pa_config_parser_state *state);
 int pa_config_parse_size(pa_config_parser_state *state);
 int pa_config_parse_bool(pa_config_parser_state *state);
 int pa_config_parse_not_bool(pa_config_parser_state *state);
 int pa_config_parse_string(pa_config_parser_state *state);
+int pa_config_parse_volume(pa_config_parser_state *state);
 
 #endif
-- 
1.9.3