1 #include <stdio.h> 2 #include <stdlib.h> 3 #include <string.h> 4 #include <stdint.h> 5 #include <unistd.h> 6 #include <fcntl.h> 7 #include <sys/ioctl.h> 8 #include <errno.h> 9 10 int hd_main(int argc, char *argv[]) 11 { 12 int c; 13 int fd; 14 unsigned char buf[4096]; 15 int res; 16 int read_len; 17 int i; 18 int filepos = 0; 19 int sum; 20 int lsum; 21 22 int base = -1; 23 int count = 0; 24 int repeat = 0; 25 26 do { 27 c = getopt(argc, argv, "b:c:r:"); 28 if (c == EOF) 29 break; 30 switch (c) { 31 case 'b': 32 base = strtol(optarg, NULL, 0); 33 break; 34 case 'c': 35 count = strtol(optarg, NULL, 0); 36 break; 37 case 'r': 38 repeat = strtol(optarg, NULL, 0); 39 break; 40 case '?': 41 fprintf(stderr, "%s: invalid option -%c\n", 42 argv[0], optopt); 43 exit(1); 44 } 45 } while (1); 46 47 if (optind + 1 != argc) { 48 fprintf(stderr, "Usage: %s [-b base] [-c count] [-r delay] file\n", argv[0]); 49 exit(1); 50 } 51 52 fd = open(argv[optind], O_RDONLY); 53 if(fd < 0) { 54 fprintf(stderr, "could not open %s, %s\n", argv[optind], strerror(errno)); 55 return 1; 56 } 57 58 do { 59 if(base >= 0) { 60 lseek(fd, base, SEEK_SET); 61 filepos = base; 62 } 63 sum = 0; 64 lsum = 0; 65 while(1) { 66 read_len = sizeof(buf); 67 if(count > 0 && base + count - filepos < read_len) 68 read_len = base + count - filepos; 69 res = read(fd, &buf, read_len); 70 if(res == 0) 71 break; 72 for(i = 0; i < res; i++) { 73 if((i & 15) == 0) { 74 printf("%08x: ", filepos + i); 75 } 76 lsum += buf[i]; 77 sum += buf[i]; 78 printf("%02x ", buf[i]); 79 if(((i & 15) == 15) || (i == res - 1)) { 80 printf("s %x\n", lsum); 81 lsum = 0; 82 } 83 } 84 if(res < 0) { 85 printf("Read error on %s, offset %d len %d, %s\n", argv[optind], filepos, read_len, strerror(errno)); 86 return 1; 87 } 88 filepos += res; 89 if(filepos == base + count) 90 break; 91 } 92 printf("sum %x\n", sum); 93 if(repeat) 94 sleep(repeat); 95 } while(repeat); 96 return 0; 97 } 98
