Function utf8len

libavformat/movenc.c:1490–1499

}

static int utf8len(const uint8_t *b)
{
    int len=0;
    int val;
    while(*b){
        GET_UTF8(val, *b++, return -1;)
        len++;
    }
    return len;
}

static int ascii_to_wc(ByteIOContext *pb, const uint8_t *b)
{