hexdump

一个十六进制格式化输出：

 1 #include <stdio.h>
 2 #include <stdlib.h>
 3 #include <string.h>
 4 
 5 
 6 void hexdump( void *data, unsigned int len )
 7 {
 8     char str[160], octet[10];
 9     int offset, i, k;
10     unsigned char *buf = (unsigned char *)data;
11     char dimm[] = "+------------------------------------------------------------------------------+";
12 
13     printf("%s\r\n", dimm);
14     printf("| Offset  : 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F   0123456789ABCDEF |\r\n");
15     printf("%s\r\n", dimm);
16 
17     for (offset = 0; offset < len; offset += 16) {
18         sprintf( str, "| %08x: ", offset );
19 
20         for (i = 0; i < 16; i++) {
21             if ((i + offset) < len)
22                 sprintf( octet, "%02x ", buf[offset + i] );
23             else
24                 strcpy( octet, "   " );
25 
26             strcat( str, octet );
27         }
28         strcat( str, "  " );
29         k = strlen( str );
30 
31         for (i = 0; i < 16; i++) {
32             if ((i + offset) < len)
33                 str[k++] = (0x20 <= (buf[offset + i]) &&  (buf[offset + i]) <= 0x7E) ? buf[offset + i] : '.';
34             else
35                 str[k++] = ' ';
36         }
37 
38         str[k] = '\0';
39         printf("%s |\r\n", str);
40     }
41 
42     printf("%s\r\n", dimm);    
43 }
44 
45 int main( void )
46 {
47     int i;
48     unsigned char test_buf[333];
49     
50     for( i = 0; i < sizeof(test_buf)/sizeof(test_buf[0]); i++ )
51     {
52         test_buf[i] = i % 256;    
53     }
54     
55     hexdump( test_buf, sizeof(test_buf)/sizeof(test_buf[0]) );
56     
57     return 0;
58 }