static int ftp_retrieve(FTPContext *s) { char command[CONTROL_BUFFER_SIZE]; const int retr_codes[] = {150, 550, 0}; /* 550 is incorrect code */ snprintf(command, sizeof(command), "RETR %s\r\n", s->path); if (ftp_send_command(s, command, retr_codes, NULL) != 150) return AVERROR(EIO); s->state = DOWNLOADING; return 0; }