dump.c

   1 #include <stdio.h>
   2
   3 static inline int myisascii(int x) {
   4         return x >= ' ' && x < 127;
   5 }
   6
   7 void dump(const unsigned char* data, size_t len) {
   8         static const char atab[] = "0123456789abcdef";
   9         char hex[24*2+1], ascii[24+1];
  10         unsigned h = 0, a = 0;
  11         int fill = ' ';
  12
  13         while(len) {
  14                 len--;
  15                 hex[h++] = atab[*data >> 4];
  16                 hex[h++] = atab[*data & 0xf];
  17                 ascii[a++] = myisascii(*data) ? *data : '.';
  18                 if(a == 24) {
  19         dump:
  20                         hex[h] = 0;
  21                         ascii[a] = 0;
  22                         printf("%s\t%s\n", hex, ascii);
  23
  24                         if(fill == '_') return; /* jump from filler */
  25
  26                         a = 0;
  27                         h = 0;
  28                 }
  29                 data++;
  30         }
  31         if(a) {
  32         filler:
  33                 while(a<24) {
  34                         hex[h++] = fill;
  35                         hex[h++] = fill;
  36                         ascii[a++] = fill;
  37                 }
  38                 goto dump;
  39         }
  40         a = 0;
  41         fill = '_';
  42         goto filler;
  43 }
  44