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421 mateuszvis 1 
/* 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) 2021-2022 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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/*
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 * echo
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 */
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static enum cmd_result cmd_echo(struct cmd_funcparam *p) {
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  const char *arg = p->cmdline + 5;
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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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    nls_outputnl(31,0); /* "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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    nls_outputnl(31,1); /* "ECHO [message]" */
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    outputnl("");
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    nls_outputnl(31,2); /* "Type ECHO without parameters to display the current setting." */
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    return(CMD_OK);
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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 (p->rmod->flags & FLAG_ECHOFLAG) {
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      nls_outputnl(31,3); /* "ECHO is on" */
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    } else {
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      nls_outputnl(31,4); /* "ECHO is off" */
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    }
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    return(CMD_OK);
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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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    p->rmod->flags |= FLAG_ECHOFLAG;
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    return(CMD_OK);
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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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    p->rmod->flags &= ~FLAG_ECHOFLAG;
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    return(CMD_OK);
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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 si
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    mov si, [arg]
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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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    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 dx
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    pop ax
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  }
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  return(CMD_OK);
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}