payloads/libpayload/libc/hexdump.c

   1 /*
   2  *
   3  * Copyright 2013 Google Inc.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. The name of the author may not be used to endorse or promote products
  14  *    derived from this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  */
  28
  29 #include <libpayload.h>
  30
  31 void hexdump(const void *memory, size_t length)
  32 {
  33         int i;
  34         uint8_t *m;
  35         int all_zero = 0;
  36
  37         m = (uint8_t *) memory;
  38
  39         for (i = 0; i < length; i += 16) {
  40                 int j;
  41
  42                 all_zero++;
  43                 for (j = 0; j < 16; j++) {
  44                         if (m[i + j] != 0) {
  45                                 all_zero = 0;
  46                                 break;
  47                         }
  48                 }
  49
  50                 if (all_zero < 2) {
  51                         printf("%8p:", memory + i);
  52                         for (j = 0; j < 16; j++)
  53                                 printf(" %02x", m[i + j]);
  54                         printf("  ");
  55                         for (j = 0; j < 16; j++)
  56                                 printf("%c",
  57                                        isprint(m[i + j]) ? m[i + j] : '.');
  58                         printf("\n");
  59                 } else if (all_zero == 2) {
  60                         printf("...\n");
  61                 }
  62         }
  63 }