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363 mateuszvis 1 
/*
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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 int 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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    outputnl("Displays the name of or changes the current directory.");
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    outputnl("");
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    outputnl("CHDIR [drive:][path]");
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    outputnl("CHDIR[..]");
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    outputnl("CD [drive:][path]");
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    outputnl("CD[..]");
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    outputnl("");
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    outputnl(".. Specifies that you want to change to the parent directory.");
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    outputnl("");
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    outputnl("Type CD drive: to display the current directory in the specified drive.");
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    outputnl("Type CD without parameters to display the current drive and directory.");
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    return(-1);
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  }
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387 mateuszvis 33 
  /* one argument max */
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  if (p->argc > 1) {
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    outputnl("Too many parameters");
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    return(-1);
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  }
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363 mateuszvis 39 
  /* 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(-1);
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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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      outputnl(doserr(err));
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    }
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  }
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  return(-1);
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}