ArgParser: allow fractional seconds in ParseCommandArg(SongTime)

NEWS

@@ -8,6 +8,7 @@ ver 0.19 (not yet released)
   - "list" on album artist falls back to the artist tag
   - "list" and "count" allow grouping
   - new "search"/"find" filter "modified-since"
+  - "seek*" allows fractional position
   - close connection after syntax error
 * database
   - proxy: forward "idle" events

doc/protocol.xml

@@ -877,8 +877,8 @@
           <listitem>
             <para>
               Seeks to the position <varname>TIME</varname> (in
-              seconds) of entry <varname>SONGPOS</varname> in the
-              playlist.
+              seconds; fractions allowed) of entry
+              <varname>SONGPOS</varname> in the playlist.
             </para>
           </listitem>
         </varlistentry>
@@ -893,7 +893,8 @@
           <listitem>
             <para>
               Seeks to the position <varname>TIME</varname> (in
-              seconds) of song <varname>SONGID</varname>.
+              seconds; fractions allowed) of song
+              <varname>SONGID</varname>.
             </para>
           </listitem>
         </varlistentry>
@@ -907,9 +908,10 @@
           </term>
           <listitem>
             <para>
-              Seeks to the position <varname>TIME</varname> within the
-              current song.  If prefixed by '+' or '-', then the time
-              is relative to the current playing position.
+              Seeks to the position <varname>TIME</varname> (in
+              seconds; fractions allowed) within the current song.  If
+              prefixed by '+' or '-', then the time is relative to the
+              current playing position.
             </para>
           </listitem>
         </varlistentry>

src/protocol/ArgParser.cxx

@@ -191,8 +191,8 @@ check_float(Client &client, float *value_r, const char *s)
 bool
 ParseCommandArg(Client &client, SongTime &value_r, const char *s)
 {
-	unsigned value;
-	bool success = check_unsigned(client, &value, s);
+	float value;
+	bool success = check_float(client, &value, s) && value >= 0;
 	if (success)
 		value_r = SongTime::FromS(value);
 
@@ -202,8 +202,8 @@ ParseCommandArg(Client &client, SongTime &value_r, const char *s)
 bool
 ParseCommandArg(Client &client, SignedSongTime &value_r, const char *s)
 {
-	int value;
-	bool success = check_int(client, &value, s);
+	float value;
+	bool success = check_float(client, &value, s);
 	if (success)
 		value_r = SignedSongTime::FromS(value);