/*********************************************************************************
 *      Copyright:  (C) 2012 Guo Wenxue <guowenxue@gmail.com>
 *                  All rights reserved.
 *
 *       Filename:  dump.c
 *    Description:  This is the buffer dump print code.
 *
 *        Version:  1.0.0(08/08/2012~)
 *         Author:  Guo Wenxue <guowenxue@gmail.com>
 *      ChangeLog:  1, Release initial version on "08/08/2012 06:51:40 PM"
 *
 ********************************************************************************/

#include <stdio.h>

void dump_buf(const char *prompt, const unsigned char *buf, size_t len)
{
    char        line[256];
    size_t      i, j;
    int         offset;

    if( prompt )
    {
        printf("%s", prompt);
    }

    for(i = 0; i < len; i += 16)
    {
        offset = snprintf(line, sizeof(line), "%08zx: ", i);

        /* Print hex representation */
        for (j = 0; j < 16; j++)
        {
            if (i + j < len)
                offset += snprintf(line + offset, sizeof(line) - offset, "%02x ", buf[i + j]);
            else
                offset += snprintf(line + offset, sizeof(line) - offset, "   ");
        }

        offset += snprintf(line + offset, sizeof(line) - offset, " ");

        /* Print ASCII representation */
        for (j = 0; j < 16; j++)
        {
            if (i + j < len)
            {
                unsigned char c = buf[i + j];
                offset += snprintf(line + offset, sizeof(line) - offset, "%c", (c >= 32 && c <= 126) ? c : '.');
            }
            else
            {
                offset += snprintf(line + offset, sizeof(line) - offset, " ");
            }
        }

        /* Print the line */
        printf("%s\n", line);
    }
}

int main (int argc, char **argv)
{
    char    buf[256];
    int     i;

    for(i=0; i<sizeof(buf); i++)
        buf[i] = i;

    dump_buf("Hex dump buffer content:\n", buf, sizeof(buf));

    return 0;
}