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Technotools (Chestnut CD-ROM)(1993).ISO
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1992-02-24
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4KB
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199 lines
PRODUCT : Borland C++ NUMBER : 714
VERSION : 2.0
OS : DOS
DATE : February 25, 1992 PAGE : 1/3
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 : February 25, 1992 PAGE : 2/3
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 : February 25, 1992 PAGE : 3/3
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;
}