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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 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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386 mateuszvis 25 
/*
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 * verify
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 */
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static enum cmd_result cmd_verify(struct cmd_funcparam *p) {
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  if (cmd_ishlp(p)) {
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    outputnl("Tells DOS whether to verify that files are written correctly to disk.");
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    outputnl("\r\nVERIFY [ON | OFF]\r\n");
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    outputnl("Type VERIFY without a parameter to display its current setting.");
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    return(CMD_OK);
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  }
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  if (p->argc > 1) {
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    outputnl("Too many parameters");
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    return(CMD_FAIL);
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  }
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  if (p->argc == 0) {
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    unsigned char verstate = 0;
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    _asm {
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      push ax
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      mov ah, 0x54   /* Get VERIFY status */
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      int 0x21       /* AL == 0 (off) or AL == 1 (on) */
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      mov [verstate], al
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      pop ax
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    }
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    if (verstate == 0) {
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      outputnl("VERIFY is off");
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    } else {
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      outputnl("VERIFY is on");
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    }
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    return(CMD_OK);
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  }
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  /* argc == 1*/
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  if (imatch(p->argv[0], "on")) {
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    _asm {
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      push ax
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      push dx
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      mov ax, 0x2e01  /* set verify ON */
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      xor dl, dl      /* apparently required by MS-DOS 2.x */
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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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  } else if (imatch(p->argv[0], "off")) {
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    _asm {
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      push ax
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      push dx
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      mov ax, 0x2e00  /* set verify OFF */
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      xor dl, dl      /* apparently required by MS-DOS 2.x */
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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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  } else {
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    outputnl("Must specify ON or OFF");
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    return(CMD_FAIL);
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  }
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  return(CMD_OK);
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}