Q32294 _Bios_keybrd() Incompatible with CTRL+BREAK Key Combination
C Compiler
5.10   | 5.10
MS-DOS | OS/2

Summary:

The example code below demonstrates a problem with the C run-time
function _bios_keybrd and CTRL+BREAK key combination. The routine
works properly until the CTRL+BREAK key combination is executed, at
which time the system locks up and requires a soft reboot. A
workaround comment is provided in the code.

The following code demonstrates the problem:

#include <bios.h>
#include <stdio.h>
#define kbpress()  _bios_keybrd(_KEYBRD_READY)
#define kbchar()  _bios_keybrd(_KEYBRD_READ)
main()
  {
    unsigned char cchr;
    printf("press any key:\n");
    cchr = ' ';
    do
        {
          if(kbpress())
        /* the insertion of <break;> here alleviates the problem*/
          {cchr = getchar()/*kbchar() & 0x00ff*/;
          printf("\nchar = %c\n",cchr);
          }
        }
    while (cchr!='*');
  }


Keywords:  buglist5.10
Updated  88/09/27 04:30