Last change
on this file since 7bf3856 was 3ae31e9, checked in by Thomas Lopatic <thomas@…>, 8 years ago |
Imported original source code.
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100755
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File size:
1.2 KB
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[3ae31e9] | 1 | /*
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| 2 | =============================================================================
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| 3 | waitcr.c -- wait for a CR from the console and allow for debugging
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| 4 | Version 3 -- 1987-07-15 -- D.N. Lynx Crowe
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| 5 | =============================================================================
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| 6 | */
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| 7 |
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| 8 | #include "biosdefs.h"
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| 9 | #include "stddefs.h"
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| 10 |
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| 11 | extern int xtrap15(); /* the ROMP trap */
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| 12 |
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| 13 | /*
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| 14 | =============================================================================
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| 15 | waitcr() -- wait for a CR or a CTL-G. CR returns control to the
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| 16 | caller, CTL-G invokes xtrap15(), which if it returns, returns to
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| 17 | the caller. The xtrap15() escape is to allow a convenient debug
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| 18 | point whenever we wait on the console. The character that caused
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| 19 | the return (CR or CTL-G) is returned as the value of the function.
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| 20 | =============================================================================
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| 21 | */
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| 22 |
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| 23 | int
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| 24 | waitcr()
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| 25 | {
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| 26 | int c;
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| 27 |
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| 28 | BIOS(B_PUTC, CON_DEV, '\007'); /* wake up the operator */
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| 29 |
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| 30 | /* await a CR, in which case we just exit */
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| 31 |
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| 32 | while ('\r' NE (c = (0x007F & (int)BIOS(B_GETC, CON_DEV))))
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| 33 | if (c EQ '\007') /* ... or a control-G */
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| 34 | xtrap15(); /* ... in which case we trap first */
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| 35 |
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| 36 | return(c); /* return the character that caused us to exit */
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| 37 | }
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