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