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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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375 mateuszvis 13 
 
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/* display current path drive d (A=1, B=2, etc)
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 * returns 0 on success, doserr otherwise */
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static unsigned short cmd_cd_curpathfordrv(char *buff, unsigned char d) {
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  unsigned short r = 0;
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  buff[0] = d + 'A' - 1;
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  buff[1] = ':';
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  buff[2] = '\\';
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  _asm {
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    push si
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    push ax
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    push dx
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    mov ah, 0x47      /* get current directory */
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    mov dl, [d]       /* A: = 1, B: = 2, etc */
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    mov si, buff      /* append cur dir to buffer */
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    add si, 3         /* skip the present drive:\ prefix */
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    int 0x21
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    jnc DONE
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    mov [r], ax       /* copy result from ax */
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    DONE:
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    pop dx
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    pop ax
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    pop si
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  }
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  return(r);
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}
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372 mateuszvis 44 
static int cmd_cd(struct cmd_funcparam *p) {
374 mateuszvis 45 
  char *buffptr = p->BUFFER;
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  /* CD /? */
387 mateuszvis 48 
  if (cmd_ishlp(p)) {
374 mateuszvis 49 
    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 63 
  /* 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 69 
  /* no argument? display current drive and dir ("CWD") */
364 mateuszvis 70 
  if (p->argc == 0) {
375 mateuszvis 71 
    unsigned char drv = 0;
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363 mateuszvis 73 
    _asm {
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      push ax
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      push dx
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      push si
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      mov ah, 0x19  /* get current default drive */
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      int 0x21      /* al = drive (00h = A:, 01h = B:, etc) */
375 mateuszvis 79 
      inc al        /* convert to 1=A, 2=B, etc */
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      mov [drv], al
363 mateuszvis 81 
    }
375 mateuszvis 82 
 
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    cmd_cd_curpathfordrv(buffptr, drv);
374 mateuszvis 84 
    outputnl(buffptr);
375 mateuszvis 85 
 
374 mateuszvis 86 
    return(-1);
363 mateuszvis 87 
  }
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  /* argument can be either a drive (D:) or a path */
364 mateuszvis 90 
  if (p->argc == 1) {
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    const char *arg = p->argv[0];
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    unsigned short err = 0;
363 mateuszvis 93 
    /* drive (CD B:) */
364 mateuszvis 94 
    if ((arg[0] != '\\') && (arg[1] == ':') && (arg[2] == 0)) {
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      unsigned char drive = arg[0];
363 mateuszvis 96 
      if (drive >= 'a') {
375 mateuszvis 97 
        drive -= ('a' - 1);
363 mateuszvis 98 
      } else {
375 mateuszvis 99 
        drive -= ('A' - 1);
363 mateuszvis 100 
      }
375 mateuszvis 101 
 
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      err = cmd_cd_curpathfordrv(buffptr, drive);
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      if (err == 0) outputnl(buffptr);
363 mateuszvis 104 
    } 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) */
364 mateuszvis 109 
        mov dx, arg
363 mateuszvis 110 
        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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    }
369 mateuszvis 118 
    if (err != 0) {
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      outputnl(doserr(err));
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    }
363 mateuszvis 121 
  }
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  return(-1);
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}