src/lib/hexdump.c

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2
   3 #include <console/console.h>
   4 #include <ctype.h>
   5 #include <lib.h>
   6
   7 void hexdump(const void *memory, size_t length)
   8 {
   9         size_t i, j;
  10         uint8_t *line;
  11         int all_zero = 0;
  12         int all_one = 0;
  13         size_t num_bytes;
  14
  15         for (i = 0; i < length; i += 16) {
  16                 num_bytes = MIN(length - i, 16);
  17                 line = ((uint8_t *)memory) + i;
  18
  19                 all_zero++;
  20                 all_one++;
  21                 for (j = 0; j < num_bytes; j++) {
  22                         if (line[j] != 0) {
  23                                 all_zero = 0;
  24                                 break;
  25                         }
  26                 }
  27
  28                 for (j = 0; j < num_bytes; j++) {
  29                         if (line[j] != 0xff) {
  30                                 all_one = 0;
  31                                 break;
  32                         }
  33                 }
  34
  35                 if ((all_zero < 2) && (all_one < 2)) {
  36                         printk(BIOS_DEBUG, "%p:", memory + i);
  37                         for (j = 0; j < num_bytes; j++)
  38                                 printk(BIOS_DEBUG, " %02x", line[j]);
  39                         for (; j < 16; j++)
  40                                 printk(BIOS_DEBUG, "   ");
  41                         printk(BIOS_DEBUG, "  ");
  42                         for (j = 0; j < num_bytes; j++)
  43                                 printk(BIOS_DEBUG, "%c",
  44                                        isprint(line[j]) ? line[j] : '.');
  45                         printk(BIOS_DEBUG, "\n");
  46                 } else if ((all_zero == 2) || (all_one == 2)) {
  47                         printk(BIOS_DEBUG, "...\n");
  48                 }
  49         }
  50 }