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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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* echo
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*/
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static int cmd_echo(struct cmd_funcparam *p) {
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unsigned short offs = FP_OFF(p->cmdline) + 5;
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unsigned short segm = FP_SEG(p->cmdline);
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mateuszvis |
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unsigned char far *echostatus = MK_FP(p->rmod->rmodseg, RMOD_OFFSET_ECHOFLAG);
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mateuszvis |
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/* display help only if /? is the only argument */
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if ((p->argc == 1) && (imatch(p->argv[0], "/?"))) {
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outputnl("Displays messages, or turns command-echoing on or off");
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outputnl("");
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outputnl("ECHO [ON | OFF]");
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outputnl("ECHO [message]");
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outputnl("");
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outputnl("Type ECHO without parameters to display the current echo setting.");
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return(-1);
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}
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/* ECHO without any parameter: display current state */
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if (p->argc == 0) {
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if (*echostatus) {
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outputnl("ECHO is on");
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} else {
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outputnl("ECHO is off");
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}
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return(-1);
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}
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/* ECHO ON */
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if ((p->argc == 1) && (imatch(p->argv[0], "on"))) {
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*echostatus = 1;
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return(-1);
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}
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/* ECHO OFF */
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if ((p->argc == 1) && (imatch(p->argv[0], "off"))) {
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*echostatus = 0;
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return(-1);
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}
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/* ECHO MSG (start at cmdline+5 since first 5 are "ECHO" + separator) */
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_asm {
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push ax
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push dx
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push ds
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push si
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mov si, [offs]
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cld /* clear direction flag (DF) so lodsb increments SI */
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mov ah, 0x02 /* display char from DL */
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mov ds, [segm]
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NEXTYBTE:
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lodsb /* load byte at DS:[SI] into AL and inc SI (if DF clear) */
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or al, al /* is AL == 0? then end of string reached */
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jz DONE
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mov dl, al
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int 0x21
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jmp NEXTYBTE
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/* output a final CR/LF */
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DONE:
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mov dl, 0x0D
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int 0x21
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mov dl, 0x0A
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int 0x21
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pop si
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pop ds
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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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