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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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 * break
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 */
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static enum cmd_result 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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    nls_outputnl(14,0); /* "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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    nls_outputnl(14,1); /* "Type BREAK without a parameter to display the current BREAK setting." */
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    return(CMD_OK);
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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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      nls_outputnl(14,2); /* "BREAK is off" */
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    } else {
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      nls_outputnl(14,3); /* "BREAK is on" */
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    }
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    return(CMD_OK);
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  }
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  /* too many params? */
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  if (p->argc > 1) {
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    nls_outputnl(0,4);
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    return(CMD_FAIL);
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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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    nls_outputnl(0,6); /* "Invalid parameter" */
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    return(CMD_FAIL);
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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(CMD_OK);
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}