PRODUCT : Borland C++ NUMBER : 714 VERSION : 2.0 OS : DOS DATE : September 18, 1991 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 #include #include #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 : September 18, 1991 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 : September 18, 1991 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; }