PRODUCT  :  Borland C++                            NUMBER  :  714
  VERSION  :  2.0
       OS  :  DOS
     DATE  :  October 19, 1993                         PAGE  :  1/4

    TITLE  :  Trapping Disk Errors




  /*******************************************************
  This program will trap disk errors and prompt the user for
  action. Try running it with no disk in drive A: to invoke
  its functions.
  ********************************************************/

  #include <stdio.h>
  #include <conio.h>
  #include <dos.h>

  #define IGNORE       0
  #define RETRY        1
  #define ABORT        2

  int buf[500];

   /* define the error messages for trapping
      disk problems */
  static char *err_msg[] = {
       "write protect",
       "unknown unit",
       "drive not ready",
       "unknown command",
       "data error (CRC)",
       "bad request",
       "seek error",
       "unknown media type",
       "sector not found",
       "printer out of paper",
       "write fault",
       "read fault",
       "general failure",
       "reserved",
       "reserved",
       "invalid disk change"
   };
  /*
     User error interface
  */
  error_win(char *msg)
  {
      int retval;














  PRODUCT  :  Borland C++                            NUMBER  :  714
  VERSION  :  2.0
       OS  :  DOS
     DATE  :  October 19, 1993                         PAGE  :  2/4

    TITLE  :  Trapping Disk Errors




      cputs(msg);

   /* prompt for user to press a key to abort,
      retry, ignore */
      while(1)
      {
          retval= getch();
          if (retval == 'a' || retval == 'A')
          {
              retval = ABORT;
              break;
          }
          if (retval == 'r' || retval == 'R')
          {
              retval = RETRY;
              break;
          }
          if (retval == 'i' || retval == 'I')
          {
              retval = IGNORE;
              break;
          }
      }

      return(retval);
   }

   /* pragma warn -par reduces warnings which
      occur due to the non use of the
      parameters errval, bp and si to the
      handler */
   #pragma warn -par

  int handler(int errval,int ax,int bp,int si)
  {
      static char msg[80];
      unsigned di;
      int drive;
      int errorno;

      di= _DI;
   /* if this is not a disk error then it was
      another device having trouble */













  PRODUCT  :  Borland C++                            NUMBER  :  714
  VERSION  :  2.0
       OS  :  DOS
     DATE  :  October 19, 1993                         PAGE  :  3/4

    TITLE  :  Trapping Disk Errors




      if (ax < 0)
      {
      /* report the error */
         error_win("Device error");
      /* and return to the program directly
         requesting abort */
         hardretn(ABORT);
      }
   /* otherwise it was a disk error */
      drive = ax & 0x00FF;
      errorno = di & 0x00FF;
   /* report which error it was */
      sprintf(msg, "Error: %s on drive "
          "%c\r\nA)bort, R)etry, I)gnore: ",
           err_msg[errorno], 'A' + drive);
   /* return to the program via dos interrupt
      0x23 with abort, retry or ignore
      as input by the user */
      hardresume(error_win(msg));
      return ABORT;
  }
  #pragma warn +par


  main()
  {
   /* install our handler on the hardware
      problem interrupt */
      harderr(handler);
      clrscr();
      printf("Make sure there is no disk in "
              "drive A:\n");
      printf("Press any key ....\n");
      getch();
      printf("Trying to access drive A:\n");
      printf("fopen returned %p\n",
             fopen("A:temp.dat", "w"));
      return 0;
  }

















  PRODUCT  :  Borland C++                            NUMBER  :  714
  VERSION  :  2.0
       OS  :  DOS
     DATE  :  October 19, 1993                         PAGE  :  4/4

    TITLE  :  Trapping Disk Errors




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