[PATCH v2 3/5] 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 | 36 ++++++++++++++++++++++++++++++++++++
 src/pulsecore/conf-parser.h |  3 ++-
 2 files changed, 38 insertions(+), 1 deletion(-)

diff --git a/src/pulsecore/conf-parser.c b/src/pulsecore/conf-parser.c
index 2dcd45a..5d54afe 100644
--- a/src/pulsecore/conf-parser.c
+++ b/src/pulsecore/conf-parser.c
@@ -312,3 +312,39 @@ 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) {
+    pa_volume_t *vol;
+    size_t len;
+    char *d_str;
+    double d;
+
+    pa_assert(state);
+
+    vol = state->data;
+
+    len = strlen(state->rvalue);
+    if (len < 2)
+        goto fail;
+
+    if (state->rvalue[len - 1] != '%')
+        goto fail;
+
+    d_str = pa_xstrndup(state->rvalue, len - 1);
+    if (pa_atod(d_str, &d) < 0)
+        goto fail;
+    pa_xfree(d_str);
+
+    d /= 100;
+    d *= PA_VOLUME_NORM;
+
+    if (d < 0 || d > PA_VOLUME_MAX)
+        goto fail;
+
+    *vol = d;
+    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