文字をダンプ

dump.c

#include <stdio.h>

void dump_char(const char c) {
   size_t i = 0;
   char buf[8] = {0};
   for(i = 0; i < 8; ++i) {
      buf[7-i] = ((c >> i) & 0x01);
   }
   for(i = 0; i < 8; ++i) {
      printf("%d", buf[i]);
   }
}

void dump(void *p, size_t size) {
   char *q = (char *) p;
   size_t i;
   for(i = 0; i < size; ++i) {
      size_t j = size - i - 1;
      char c = q[j];
      dump_char(c);
      printf(" ");
   }
}

int main()
{
   int x = 0x01;
   double y0 = 0.1;
   double y1 = -0.1;
   dump(&x, sizeof(x));
   printf("\n");
   dump(&y0, sizeof(double));
   printf("\n");
   dump(&y1, sizeof(double));
   printf("\n");
   return 0;
}