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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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 * chdir
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 *
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 * displays the name of or changes the current directory.
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 *
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 * CHDIR [drive:][path]
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 * CD..
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 *
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 * Type CD drive: to display the current directory in the specified drive.
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 * Type CD without parameters to display the current drive and directory.
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 */
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static enum cmd_result cmd_cd(struct cmd_funcparam *p) {
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  char *buffptr = p->BUFFER;
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  /* CD /? */
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  if (cmd_ishlp(p)) {
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    nls_outputnl(12,0); /* "Displays the name of or changes the current directory." */
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    outputnl("");
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    nls_outputnl(12,1); /* "CHDIR [drive:][path]" */
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    nls_outputnl(12,2); /* "CHDIR[..]" */
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    nls_outputnl(12,3); /* "CD [drive:][path]" */
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    nls_outputnl(12,4); /* "CD[..]" */
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    outputnl("");
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    nls_outputnl(12,5); /* ".. Specifies that you want to change to the parent directory." */
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    outputnl("");
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    nls_outputnl(12,6); /* "Type CD drive: to display the current directory in the specified drive." */
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    nls_outputnl(12,7); /* "Type CD without parameters to display the current drive and directory." */
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    return(CMD_OK);
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  }
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  /* one argument max */
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  if (p->argc > 1) {
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    nls_outputnl(0,4); /* "Too many parameters" */
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    return(CMD_FAIL);
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  }
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  /* no argument? display current drive and dir ("CWD") */
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  if (p->argc == 0) {
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    curpathfordrv(buffptr, 0);
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    outputnl(buffptr);
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    return(CMD_OK);
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  }
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  /* argument can be either a drive (D:) or a path */
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  if (p->argc == 1) {
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    const char *arg = p->argv[0];
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    unsigned short err = 0;
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    /* drive (CD B:) */
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    if ((arg[0] != '\\') && (arg[1] == ':') && (arg[2] == 0)) {
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      unsigned char drive = arg[0];
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      if (drive >= 'a') {
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        drive -= ('a' - 1);
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      } else {
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        drive -= ('A' - 1);
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      }
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      err = curpathfordrv(buffptr, drive);
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      if (err == 0) outputnl(buffptr);
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    } else { /* path */
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      _asm {
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        push dx
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        push ax
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        mov ah, 0x3B  /* CHDIR (set current directory) */
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        mov dx, arg
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        int 0x21
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        jnc DONE
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        mov [err], ax
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        DONE:
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        pop ax
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        pop dx
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      }
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    }
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    if (err != 0) {
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      nls_outputnl_doserr(err);
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      return(CMD_FAIL);
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    }
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  }
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  return(CMD_OK);
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}