68 lines
1.8 KiB
C
68 lines
1.8 KiB
C
/* $OpenBSD: db_rint.c,v 1.1 2022/07/12 17:12:31 jca Exp $ */
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/* $NetBSD: db_machdep.c,v 1.17 1999/06/20 00:58:23 ragge Exp $ */
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/*
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* Mach Operating System
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* Copyright (c) 1991,1990 Carnegie Mellon University
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* All Rights Reserved.
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*
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* Permission to use, copy, modify and distribute this software and its
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* documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
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* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*/
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#include <sys/types.h>
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#include <sys/systm.h>
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#include <ddb/db_var.h>
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/*
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* db_rint: enters ddb(4) if the "ESC D" sequence is matched.
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* Returns:
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* - 0 if the character isn't part of the escape sequence
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* - 1 if the character is part of the escape sequence and should be skipped
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* - 2 if the character isn't the end of an escape sequence, and an ESC
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* character should be inserted before it.
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*/
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int
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db_rint(int c)
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{
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static int ddbescape = 0;
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if (ddbescape && ((c & 0x7f) == 'D')) {
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if (db_console)
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db_enter();
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ddbescape = 0;
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return 1;
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}
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if ((ddbescape == 0) && ((c & 0x7f) == 27)) {
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ddbescape = 1;
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return 1;
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}
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if (ddbescape) {
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ddbescape = 0;
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return 2;
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}
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ddbescape = 0;
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return 0;
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}
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