#include <stdio.h>
#include <string.h>
/*-----return codes-----*/
#define BAD_LEN    -1
#define OK	    0

main(argc,argv)
     int argc;
     char **argv;
  {
    FILE *inf,*opf;
    int n, items_read;
    char  carr[2];
    char  tchar[2];
    short outval;

    if (argc > 1)
      inf=fopen(argv[1],"r");
    else
      inf=stdin;
    if (argc > 2)
      opf=fopen(argv[2],"w");
    else
      opf=stdout;

    while ((n=fread(carr,1,2,inf)) == 2){
	tchar[0] = carr[1];
	tchar[1] = carr[0];
	memcpy(&outval,tchar,2);
	fwrite(&outval,sizeof(short),1,opf);
	items_read++;
      }
    if (ferror(inf)) {
      fprintf(stderr,"?Read error, file %s items read %d\n",
	      argv[1],items_read);
      exit(1);
    }
    fclose(inf);
    fclose(opf);
  }