hexdump.c

/*
 * DESFire-Shell: Modify MIFARE DESFire Cards
 *
 * Copyright (C) 2015-2021 Mario Haustein
 *
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation, either version 3 of the License, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program. If not, see https://www.gnu.org/licenses/.
 */

#include <stdint.h>
#include <stdio.h>

#include "hexdump.h"



char *hexdump_line(uint8_t *buffer, unsigned int len, unsigned int offset)
{
  static char line[80];
  unsigned int col;
  char *linepos;


  if(len > 8)
    len = 8;

  linepos = line;
  linepos += sprintf(linepos, "%08x ", offset);

  for(col = 0; col < 8; col++)
  {
    linepos += sprintf(linepos, col != 4 ? " " : "  ");
    if(col < len)
      linepos += sprintf(linepos, "%02x", buffer[col]);
    else
      linepos += sprintf(linepos, "  ");
  }

  linepos += sprintf(linepos, "  |");

  for(col = 0; col < 8; col++)
  {
    if(col < len)
    {
      uint8_t c = buffer[col];
      linepos += sprintf(linepos, "%c",
        c >= 0x20 && c < 0x7f ? c : '.');
    }
    else
      linepos += sprintf(linepos, " ");
  }

  linepos += sprintf(linepos, "|");


  return line;
}