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
hd_main(int argc,char * argv[])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 rv = 0;
18 int i;
19 int filepos = 0;
20 int sum;
21 int lsum;
22
23 int base = -1;
24 int count = 0;
25 int repeat = 0;
26
27 do {
28 c = getopt(argc, argv, "b:c:r:");
29 if (c == EOF)
30 break;
31 switch (c) {
32 case 'b':
33 base = strtol(optarg, NULL, 0);
34 break;
35 case 'c':
36 count = strtol(optarg, NULL, 0);
37 break;
38 case 'r':
39 repeat = strtol(optarg, NULL, 0);
40 break;
41 case '?':
42 fprintf(stderr, "%s: invalid option -%c\n",
43 argv[0], optopt);
44 exit(1);
45 }
46 } while (1);
47
48 if (optind + 1 != argc) {
49 fprintf(stderr, "Usage: %s [-b base] [-c count] [-r delay] file\n", argv[0]);
50 exit(1);
51 }
52
53 fd = open(argv[optind], O_RDONLY);
54 if(fd < 0) {
55 fprintf(stderr, "could not open %s, %s\n", argv[optind], strerror(errno));
56 return 1;
57 }
58
59 do {
60 if(base >= 0) {
61 lseek(fd, base, SEEK_SET);
62 filepos = base;
63 }
64 sum = 0;
65 lsum = 0;
66 while(1) {
67 read_len = sizeof(buf);
68 if(count > 0 && base + count - filepos < read_len)
69 read_len = base + count - filepos;
70 res = read(fd, &buf, read_len);
71 if(res == 0)
72 break;
73 for(i = 0; i < res; i++) {
74 if((i & 15) == 0) {
75 printf("%08x: ", filepos + i);
76 }
77 lsum += buf[i];
78 sum += buf[i];
79 printf("%02x ", buf[i]);
80 if(((i & 15) == 15) || (i == res - 1)) {
81 printf("s %x\n", lsum);
82 lsum = 0;
83 }
84 }
85 if(res < 0) {
86 printf("Read error on %s, offset %d len %d, %s\n", argv[optind], filepos, read_len, strerror(errno));
87 return 1;
88 }
89 filepos += res;
90 if(filepos == base + count)
91 break;
92 }
93 printf("sum %x\n", sum);
94 if(repeat)
95 sleep(repeat);
96 } while(repeat);
97 return 0;
98 }
99