improve ff_get_line to return line length

Originally committed as revision 24400 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/aviobuf.c

@@ -554,18 +554,19 @@ char *get_strz(ByteIOContext *s, char *buf, int maxlen)
     return buf;
 }
 
-void ff_get_line(ByteIOContext *s, char *buf, int maxlen)
+int ff_get_line(ByteIOContext *s, char *buf, int maxlen)
 {
     int i = 0;
     char c;
 
     do {
         c = get_byte(s);
-        if (i < maxlen-1)
+        if (c && i < maxlen-1)
             buf[i++] = c;
     } while (c != '\n' && c);
 
     buf[i] = 0;
+    return i;
 }
 
 uint64_t get_be64(ByteIOContext *s)

libavformat/internal.h

@@ -167,7 +167,7 @@ int ff_get_v_length(uint64_t val);
  */
 void ff_put_v(ByteIOContext *bc, uint64_t val);
 
-void ff_get_line(ByteIOContext *s, char *buf, int maxlen);
+int ff_get_line(ByteIOContext *s, char *buf, int maxlen);
 
 #define SPACE_CHARS " \t\r\n"