内存显示函数

闲来无事,为了练练c编程,于是乎就写了以下这个函数:

/***********************************************************************************
3 * Function Name :       print_hex_ascii
4 *
5 * Parameter:           buff   ---- The head pointer of the data buffer
6 *                       len     ---- The total length of the data buffer
7 *                       offset ---- The offset of the buffer
8 *
9 * Description:         print the data in the 'buff' with both hex and ascii
10 *                       eg.
11 *   0022ff00   30 31 32 33   34 35 36 37   38 39 3a 3b   3c 3d 3e 3f   0123456789:;<=>?
12 *   0022ff10   40 41 42 43   44 45 46 47   48 49 4a 4b   4c 4d 4e 4f   @ABCDEFGHIJKLMNO
13 *   0022ff20   50 51 52 53   54 55 56 57   58 59 5a 5b   5c 5d 5e 5f   PQRSTUVWXYZ[/]^_
14 *
15 * Return   ：           NONE
16 *
17 **********************************************************************************/
18
19 void print_hex_ascii(const u8 *buff,int len,int offset)
20 {
21     int total_line;
22     int i,j,index;
23 #define LENGTH_PER_LINE 16
24
25     if(offset>=len)
26         return;
27
28      total_line = (len+(LENGTH_PER_LINE-1))/LENGTH_PER_LINE;
29
30     for(i=0; i<total_line; i++)
31      {
32         /* print base address */
33          printf("%08x   ",(int)buff+i*LENGTH_PER_LINE);
34
35         /* print hex in every line */
36         for(j=0; j<LENGTH_PER_LINE; j++)
37          {
38              index = i*LENGTH_PER_LINE+j;
39
40             if ( (index >= len) || (index < offset) )
41              {
42                  printf("   ");
43              }
44             else
45              {
46                  printf("%02x ",buff[index]);
47              }
48
49             if(j%4==3)
50                  printf(" ");
51          }
52
53          printf(" "); //The gap between hex and ascii;
54
55         /* print ascii after the hex */
56         for(j=0; j<LENGTH_PER_LINE; j++)
57          {
58              index = i*LENGTH_PER_LINE+j;
59
60             if( (index>=len) || (index<offset) )
61              {
62                  printf(" ");
63              }
64             else
65              {
66                 if( isprint(buff[index]) )
67                      printf("%c", buff[index]);
68                 else if(index<len)
69                      printf(".");
70              }
71          }
72
73          printf("/n");
74      }
75 }