source: buchla-68k/iolib/waitcr.c@ cbe2c15

Last change on this file since cbe2c15 was f40a309, checked in by Thomas Lopatic <thomas@…>, 7 years ago

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  • Property mode set to 100644
File size: 1.2 KB
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[f40a309]1/*
2 =============================================================================
3 waitcr.c -- wait for a CR from the console and allow for debugging
4 Version 3 -- 1987-07-15 -- D.N. Lynx Crowe
5 =============================================================================
6*/
7
8#include "biosdefs.h"
9#include "stddefs.h"
10
11extern int xtrap15(); /* the ROMP trap */
12
13/*
14 =============================================================================
15 waitcr() -- wait for a CR or a CTL-G. CR returns control to the
16 caller, CTL-G invokes xtrap15(), which if it returns, returns to
17 the caller. The xtrap15() escape is to allow a convenient debug
18 point whenever we wait on the console. The character that caused
19 the return (CR or CTL-G) is returned as the value of the function.
20 =============================================================================
21*/
22
23int
24waitcr()
25{
26 int c;
27
28 BIOS(B_PUTC, CON_DEV, '\007'); /* wake up the operator */
29
30 /* await a CR, in which case we just exit */
31
32 while ('\r' NE (c = (0x007F & (int)BIOS(B_GETC, CON_DEV))))
33 if (c EQ '\007') /* ... or a control-G */
34 xtrap15(); /* ... in which case we trap first */
35
36 return(c); /* return the character that caused us to exit */
37}
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