bless-lpc.c (1046B)
1 /* debugger.c 2 * 3 * Copyright 2011 Brian Swetland <swetland@frotz.net> 4 * 5 * Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 18 #include <stdio.h> 19 #include <stdlib.h> 20 #include <unistd.h> 21 #include <stdint.h> 22 #include <fcntl.h> 23 24 int main(int argc, char *argv[]) { 25 int fd; 26 uint32_t tmp, chk, n; 27 28 chk = 0; 29 30 if (argc != 2) 31 return -1; 32 if ((fd = open(argv[1], O_RDWR)) < 0) 33 return -1; 34 for (n = 0; n < 7; n++) { 35 if (read(fd, &tmp, 4) != 4) 36 return -1; 37 chk += tmp; 38 } 39 tmp = - chk; 40 n = write(fd, &tmp, 4); 41 close(fd); 42 return 0; 43 }