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mateuszvis |
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/* This file is part of the SvarCOM project and is published under the terms
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* of the MIT license.
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*
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* Copyright (C) 2021 Mateusz Viste
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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mateuszvis |
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/*
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* break
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*/
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static int cmd_break(struct cmd_funcparam *p) {
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unsigned char brkflag = 0;
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if (cmd_ishlp(p)) {
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outputnl("Sets or clears extended CTRL+C checking");
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outputnl("");
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outputnl("BREAK [ON | OFF]");
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outputnl("");
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outputnl("Type BREAK without a parameter to display the current BREAK setting.");
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return(-1);
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}
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/* no params: display current break state */
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if (p->argc == 0) {
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_asm {
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push ax
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push dx
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mov ax, 0x3300 /* query break-check flag */
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int 0x21 /* status (0=OFF, 1=ON) in DL */
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mov [brkflag], dl
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pop dx
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pop ax
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}
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if (brkflag == 0) {
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outputnl("BREAK is off");
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} else {
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outputnl("BREAK is on");
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}
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return(-1);
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}
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/* too many params? */
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if (p->argc > 1) {
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outputnl("Too many parameters");
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return(-1);
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}
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/* exactly 1 parameter - "on" or "off" */
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if (imatch(p->argv[0], "on")) {
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brkflag = 1;
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} else if (!imatch(p->argv[0], "off")) {
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outputnl("Invalid parameter");
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return(-1);
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}
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/* set break accordingly to brkflag */
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_asm {
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push ax
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push dx
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mov ax, 0x3301 /* set break-check level */
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mov dl, [brkflag] /* 0=OFF 1=ON */
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int 0x21
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pop dx
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pop ax
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}
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return(-1);
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}
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