Help with String conversions

Getting Started
1

I’m not very good at C++, can you help me in finding what is wrong:

char filename[13];
sprintf(filename, "HELLO%d.MP3", random(8));
Serial.print("Play `");
Serial.print(filename);
Serial.println("`");
player.singlePlayName(filename);

In the module

void Garan::singlePlayName(char *name)  {
   Serial.print("Here goes ");
   Serial.print(strlen(name));
   Serial.println(name);
   strcpy((char *)&_commandBuff[3], name);
    buildHead(strlen(name) + 2, 4);
   sendCommand(_commandBuff);
   //_serial.begin(9600);
 }

And sendCommand

void Garan::sendCommand(uint8_t command[])  {
uint8_t checksum = 0;

_serial.write(0x24);
Serial.write(0x24);
for (uint16_t i = 0; i <= command[0]; i++) {
    _serial.write(command[i]);
    Serial.write(command[i]);
    checksum ^= command[i];
}

_serial.write(checksum);
Serial.write(checksum);

}

I’ve added Serial prints for debugging
Name is passed to singlePlayName command, it’s length is 10, but it is not getting copied to command and is not sent to serial
Red box here should contain filename, but it does not http://screenshots.ryotsuke.ru/scr_58b766061e58.png

Command send should be 0x24 0x0C 0x04 filename 0xchecksum

Apparantly strcpy is doing something not right

Can you help me spotting the issue?

2

I’ve ended up with dropping strcpy and using this approach:

uint8_t size = strlen(name);
strncpy((char *)&_commandBuff[3], name, size+1);
buildHead(size + 2, 4);
sendCommand(_commandBuff);