CopyHFSMeta/dump.c

   1 #include <stdio.h>
   2 #include <ctype.h>
   3 #include <unistd.h>
   4
   5 #define MIN(a, b) \
   6         ({ __typeof(a) _a = (a); __typeof(b) _b = (b);  \
   7                 (_a < _b) ? _a : _b; })
   8
   9 enum { WIDTH = 16, };
  10
  11 /*
  12  * Debug functions only.
  13  */
  14 void
  15 DumpData(const void *data, size_t len)
  16 {
  17         unsigned char *base = (unsigned char*)data;
  18         unsigned char *end = base + len;
  19         unsigned char *cp = base;
  20         int allzeroes = 0;
  21
  22         while (cp < end) {
  23                 unsigned char *tend = MIN(end, cp + WIDTH);
  24                 unsigned char *tmp;
  25                 int i;
  26                 size_t gap = (cp + WIDTH) - tend;
  27
  28                 if (gap != 0 || tend == end)
  29                         allzeroes = 0;
  30                 if (allzeroes) {
  31                         for (tmp = cp; tmp < tend; tmp++) {
  32                                 if (*tmp) {
  33                                         allzeroes = 0;
  34                                         break;
  35                                 }
  36                         }
  37                         if (allzeroes == 1) {
  38                                 printf(". . .\n");
  39                                 allzeroes = 2;
  40                         }
  41                         if (allzeroes) {
  42                                 cp += WIDTH;
  43                                 continue;
  44                         }
  45                 }
  46                 allzeroes = 1;
  47
  48                 printf("%04x:  ", (int)(cp - base));
  49                 for (i = 0, tmp = cp; tmp < tend; tmp++) {
  50                         printf("%02x", *tmp);
  51                         if (++i % 2 == 0)
  52                                 printf(" ");
  53                         if (*tmp)
  54                                 allzeroes = 0;
  55                 }
  56                 for (i = (int)gap; i >= 0; i--) {
  57                         printf("  ");
  58                         if (i % 2 == 1)
  59                                 printf(" ");
  60                 }
  61                 printf("    |");
  62                 for (tmp = cp; tmp < tend; tmp++) {
  63                         printf("%c", isalnum(*tmp) ? *tmp : '.');
  64                 }
  65                 for (i = 0; i < gap; i++) {
  66                         printf(" ");
  67                 }
  68                 printf("|\n");
  69                 cp += WIDTH;
  70         }
  71
  72         return;
  73
  74 }