bin to asc

#include <stdio.h>
#include <stdlib.h>

int main(int argc, char **argv) {
 FILE *fdb = NULL;
 FILE *fda = NULL;
 unsigned char c;
 char h[2];

 if (argc!=2)
  return -1;
 
 if (NULL == argv[1])
  return -1;

 fdb = fopen(argv[1], "rb");
 if(NULL == fdb)
  return -1;

 fda = fopen("asc.txt", "wb");
 if (NULL == fda) {
  fclose(fdb);
  return -1;
 }

 while(fread(&c, 1, 1, fdb) != 0) {
  //printf("%d", c);
  sprintf(h, "%2x", c);
  if (h[0] == ' ')
   h[0] = '0';
  fprintf(fda, "%c", h[0]);
  fprintf(fda, "%c", h[1]);
  //printf(" = %c%c/n", h[0], h[1]);
 }

 fclose(fda);
 fclose(fdb);

 return 0;
}