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Updated copyright notices
Added stack effects to kernel/input.fs

    1: \ input output basics				(extra since)	02mar97jaw
    2: 
    3: \ Copyright (C) 1995-2003 Free Software Foundation, Inc.
    4: 
    5: \ This file is part of Gforth.
    6: 
    7: \ Gforth is free software; you can redistribute it and/or
    8: \ modify it under the terms of the GNU General Public License
    9: \ as published by the Free Software Foundation; either version 2
   10: \ of the License, or (at your option) any later version.
   11: 
   12: \ This program is distributed in the hope that it will be useful,
   13: \ but WITHOUT ANY WARRANTY; without even the implied warranty of
   14: \ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   15: \ GNU General Public License for more details.
   16: 
   17: \ You should have received a copy of the GNU General Public License
   18: \ along with this program; if not, write to the Free Software
   19: \ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
   20: 
   21: require ./basics.fs
   22: 
   23: \ Output                                               13feb93py
   24: 
   25: has? os [IF]
   26: 0 Value outfile-id ( -- file-id ) \ gforth
   27: 0 Value infile-id ( -- file-id ) \ gforth
   28:     
   29: : (type) ( c-addr u -- ) \ gforth
   30:     outfile-id write-file drop \ !! use ?DUP-IF THROW ENDIF instead of DROP ?
   31: ;
   32: 
   33: : (emit) ( c -- ) \ gforth
   34:     outfile-id emit-file drop \ !! use ?DUP-IF THROW ENDIF instead of DROP ?
   35: ;
   36: 
   37: : (key) ( -- c ) \ gforth
   38:     infile-id key-file ;
   39: 
   40: : (key?) ( -- flag ) \ gforth
   41:     infile-id key?-file ;
   42: [THEN]
   43: 
   44: undef-words
   45: 
   46: Defer type ( c-addr u -- ) \ core
   47:   \G If @var{u}>0, display @var{u} characters from a string starting
   48:   \G with the character stored at @var{c-addr}.
   49: [IFDEF] write-file
   50: : (type) 0 write-file drop ;
   51: [ELSE]
   52: : (type) BEGIN dup WHILE
   53:     >r dup c@ (emit) 1+ r> 1- REPEAT 2drop ;
   54: [THEN]
   55: 
   56: [IFDEF] (type) ' (type) IS Type [THEN]
   57: 
   58: Defer emit ( c -- ) \ core
   59:   \G Display the character associated with character value c.
   60: : (emit) ( c -- ) \ gforth
   61:     0 emit-file drop \ !! use ?DUP-IF THROW ENDIF instead of DROP ?
   62: ;
   63: 
   64: [IFDEF] (emit) ' (emit) IS emit [THEN]
   65: 
   66: Defer key ( -- char ) \ core
   67: \G Receive (but do not display) one character, @var{char}.
   68: 
   69: [IFDEF] (key) ' (key) IS key [THEN]
   70: 
   71: Defer key? ( -- flag ) \ facility key-question
   72: \G Determine whether a character is available. If a character is
   73: \G available, @var{flag} is true; the next call to @code{key} will
   74: \G yield the character. Once @code{key?} returns true, subsequent
   75: \G calls to @code{key?} before calling @code{key} or @code{ekey} will
   76: \G also return true.
   77: 
   78: [IFDEF] (key?) ' (key?) IS key? [THEN]
   79: 
   80: all-words
   81: 
   82: : (.")     "lit count type ;
   83: : (S")     "lit count ;
   84: 
   85: \ Input                                                13feb93py
   86: 
   87: 07 constant #bell ( -- c ) \ gforth
   88: 08 constant #bs ( -- c ) \ gforth
   89: 09 constant #tab ( -- c ) \ gforth
   90: 7F constant #del ( -- c ) \ gforth
   91: 0D constant #cr   ( -- c ) \ gforth
   92: \ the newline key code
   93: 0C constant #ff ( -- c ) \ gforth
   94: 0A constant #lf ( -- c ) \ gforth
   95: 
   96: : bell  #bell emit [ has? os [IF] ] outfile-id flush-file drop [ [THEN] ] ;
   97: : cr ( -- ) \ core c-r
   98:     \G Output a newline (of the favourite kind of the host OS).  Note
   99:     \G that due to the way the Forth command line interpreter inserts
  100:     \G newlines, the preferred way to use @code{cr} is at the start
  101:     \G of a piece of text; e.g., @code{cr ." hello, world"}.
  102:     newline type ;
  103: 
  104: : space ( -- ) \ core
  105:   \G Display one space.
  106:   bl emit ;
  107: 
  108: has? ec [IF]
  109: : spaces ( n -- ) \ core
  110:   \G If n > 0, display n spaces. 
  111:   0 max 0 ?DO space LOOP ;
  112: : backspaces  0 max 0 ?DO  #bs emit  LOOP ;
  113: [ELSE]
  114: \ space spaces		                                21mar93py
  115: decimal
  116: Create spaces ( u -- ) \ core
  117:   \G Display @var{n} spaces. 
  118:   bl 80 times \ times from target compiler! 11may93jaw
  119: DOES>   ( u -- )
  120:   swap
  121:   0 max 0 ?DO  I' I - &80 min 2dup type  +LOOP  drop ;
  122: Create backspaces
  123:   08 80 times \ times from target compiler! 11may93jaw
  124: DOES>   ( u -- )
  125:   swap
  126:   0 max 0 ?DO  I' I - &80 min 2dup type  +LOOP  drop ;
  127: hex
  128: [THEN]
  129: