76 lines
1.4 KiB
C
76 lines
1.4 KiB
C
/*
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* Copyright (c) 1993 Colin Plumb. All rights reserved.
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* For licensing and other legal details, see the file legal.c.
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*
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* MS-DOS non-echoing keyboard routines.
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*/
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#include <conio.h> /* For getch() and kbhit() */
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#include <signal.h> /* For raise() */
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#ifdef _MSC_VER
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#include <time.h> /* For clock() */
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#else
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#include <dos.h> /* For sleep() */
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#endif
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#include "kb.h"
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#include "random.h" /* For randEvent() */
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/* These are pretty boring */
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void kbCbreak(void) { }
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void kbNorm(void) { }
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int kbGet(void)
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{
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int c;
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c = getch();
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if (c == 0)
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c = 0x100 + getch();
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/*
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* Borland C's getch() uses int 0x21 function 0x7,
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* which does not detect break. So we do it explicitly.
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*/
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if (c == 3)
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raise(SIGINT);
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randEvent(c);
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return c;
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}
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#ifdef _MSC_VER
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/*
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* Microsoft Visual C 1.5 (at least) does not have sleep() in the
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* library. So we use this crude approximation. ("crude" because,
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* assuming CLOCKS_PER_SEC is 18.2, it rounds to 18 to avoid floating
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* point math.)
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*/
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#ifndef CLOCKS_PER_SEC
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#define CLOCKS_PER_SEC CLK_TCK
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#endif
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static unsigned
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sleep(unsigned t)
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{
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clock_t target;
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target = clock() + t * (unsigned)CLOCKS_PER_SEC;
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while (clock() < target)
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;
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return 0;
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}
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#endif
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void kbFlush(int thorough)
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{
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do {
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while(kbhit())
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(void)getch();
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if (!thorough)
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break;
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/* Extra thorough: wait for one second of quiet */
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sleep(1);
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} while (kbhit());
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}
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