hexdump

一个十六进制格式化输出：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>


void hexdump( void *data, unsigned int len )
{
    char str[160], octet[10];
    int offset, i, k;
    unsigned char *buf = (unsigned char *)data;
    char dimm[] = "+------------------------------------------------------------------------------+";

    printf("%s
", dimm);
    printf("| Offset  : 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F   0123456789ABCDEF |
");
    printf("%s
", dimm);

    for (offset = 0; offset < len; offset += 16) {
        sprintf( str, "| %08x: ", offset );

        for (i = 0; i < 16; i++) {
            if ((i + offset) < len)
                sprintf( octet, "%02x ", buf[offset + i] );
            else
                strcpy( octet, "   " );

            strcat( str, octet );
        }
        strcat( str, "  " );
        k = strlen( str );

        for (i = 0; i < 16; i++) {
            if ((i + offset) < len)
                str[k++] = (0x20 <= (buf[offset + i]) &&  (buf[offset + i]) <= 0x7E) ? buf[offset + i] : '.';
            else
                str[k++] = ' ';
        }

        str[k] = '';
        printf("%s |
", str);
    }

    printf("%s
", dimm);    
}

int main( void )
{
    int i;
    unsigned char test_buf[333];
    
    for( i = 0; i < sizeof(test_buf)/sizeof(test_buf[0]); i++ )
    {
        test_buf[i] = i % 256;    
    }
    
    hexdump( test_buf, sizeof(test_buf)/sizeof(test_buf[0]) );
    
    return 0;
}