#include <stdio.h>
#include <ctype.h>
#include "dfc.h"

FILE *Fopen();

main(argc,argv)
int	argc;
char	**argv;
{
  short int	style=LISTING;
  short int	matches=1;
  short int	errflag=0;
  short int	status=CMD_ERR;

  while (--argc && **++argv=='-' && ! errflag) {
    switch(*++*argv) {
    case 'L':
    case 'l': style=LISTING;
              break;
    case 'S':
    case 's': style=SCRIPT;
              break;
    case 'M':
    case 'm': ++*argv;
              if(! (errflag+=(! isdigit(**argv)))) {
              matches=atoi(*argv);
              }
    break;
              default : errflag++;
              break;
    }
  }
  if (errflag || argc!=2) {
      fprintf(stderr,"usage: dfc [-{l|s|mINT}] Oldfile Newfile\n");
  }
  else {
     DFC_PAR dp;

     if ((dp.fp_old=Fopen(*argv,R_PLUS_BIN))!=NULL) {
       if ((dp.fp_new=Fopen(*argv,R_PLUS_BIN))!=NULL) {
         dp.fp_out=stdout;
         dp.style=style;
         dp.matches=matches;
         switch((status=dodfc(&dp))) {
         case BAD_SEEK:      fprintf(stderr,"dfc: can't seek\n");
                             break;
         case NO_MEMORY:     fprintf(stderr,"dfc: not enough core\n");
                             break;
         case NO_DIFFERENCE: fprintf(stderr,"dfc: no difference\n");
                             break;
         case 1:             fprintf(stderr,"dfc: one difference\n",PRG);
                             break;
         default:            fprintf(stderr,"dfc: %d differences\n",
                                     status);
                             break;
         }
         fclose(dp.fp_old);
       }
       fclose(dp.fp_new);
     }
   }
   exit(status);
}

/* -- Fopen --------------------------------------------------------------------
   Fopen oeffnet eine Datei fuer Standard-E/A. Im Fehlerfall wird eine Meldung
   ausgegeben.
   -------------------------------------------------------------------------- */
FILE *Fopen(name,type)
char *name,*type;
{
  FILE  *fp;
  if ((fp=fopen(name,type))==NULL) {
    perror(name);
    return(NULL);
  }
  return(fp);
}

Bild 4. Das Programm-Listing