Annotation of gforth/kernel-ec/io.fs, revision 1.2

1.1       pazsan      1: \ input output basics                          (extra since)   02mar97jaw
                      2: 
1.2     ! anton       3: \ Copyright (C) 1995,1996,1997,1998,2000,2003,2006,2007,2012 Free Software Foundation, Inc.
1.1       pazsan      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 3
                     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, see http://www.gnu.org/licenses/.
                     19: 
                     20: require ./basics.fs
                     21: 
                     22: \ Output                                               13feb93py
                     23: 
                     24: has? os [IF]
                     25: 0 Value infile-id ( -- file-id ) \ gforth
                     26: 0 Value outfile-id ( -- file-id ) \ gforth
                     27: 0 Value debug-fid ( -- 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: : (key) ( -- c ) \ gforth
                     69:     infile-id key-file ;
                     70: : infile-id  stdin ;
                     71: 
                     72: [IFDEF] (key) ' (key) IS key [THEN]
                     73: 
                     74: Defer key? ( -- flag ) \ facility key-question
                     75: \G Determine whether a character is available. If a character is
                     76: \G available, @var{flag} is true; the next call to @code{key} will
                     77: \G yield the character. Once @code{key?} returns true, subsequent
                     78: \G calls to @code{key?} before calling @code{key} or @code{ekey} will
                     79: \G also return true.
                     80: : (key?) ( -- flag ) \ gforth
                     81:     infile-id key?-file ;
                     82: : infile-id  stdin ;
                     83: 
                     84: [IFDEF] (key?) ' (key?) IS key? [THEN]
                     85: 
                     86: [IFDEF] (form) Defer form ' (form) IS form [THEN]
                     87: 
                     88: all-words
                     89: 
                     90: : (.")     "lit count type ;
                     91: : (S")     "lit count ;
                     92: 
                     93: \ Input                                                13feb93py
                     94: 
                     95: 04 constant #eof ( -- c ) \ gforth
                     96: 07 constant #bell ( -- c ) \ gforth
                     97: 08 constant #bs ( -- c ) \ gforth
                     98: 09 constant #tab ( -- c ) \ gforth
                     99: 7F constant #del ( -- c ) \ gforth
                    100: 0D constant #cr   ( -- c ) \ gforth
                    101: \ the newline key code
                    102: 0C constant #ff ( -- c ) \ gforth
                    103: 0A constant #lf ( -- c ) \ gforth
                    104: 
                    105: : bell  #bell emit [ has? os [IF] ] outfile-id flush-file drop [ [THEN] ] ;
                    106: Defer cr ( -- ) \ core c-r
                    107:     \G Output a newline (of the favourite kind of the host OS).  Note
                    108:     \G that due to the way the Forth command line interpreter inserts
                    109:     \G newlines, the preferred way to use @code{cr} is at the start
                    110:     \G of a piece of text; e.g., @code{cr ." hello, world"}.
                    111: : (cr) ( -- )
                    112:     newline type ;
                    113: ' (cr) IS cr
                    114: 
                    115: : space ( -- ) \ core
                    116:   \G Display one space.
                    117:   bl emit ;
                    118: 
                    119: has? os 0= [IF]
                    120: : spaces ( n -- ) \ core
                    121:   \G If n > 0, display n spaces. 
                    122:   0 max 0 ?DO space LOOP ;
                    123: : backspaces  0 max 0 ?DO  #bs emit  LOOP ;
                    124: [ELSE]
                    125: \ space spaces                                         21mar93py
                    126: decimal
                    127: Create spaces ( u -- ) \ core
                    128:   \G Display @var{n} spaces. 
                    129:   bl 80 times \ times from target compiler! 11may93jaw
                    130: DOES>   ( u -- )
                    131:   swap
                    132:   0 max 0 ?DO  I' I - &80 min 2dup type  +LOOP  drop ;
                    133: Create backspaces
                    134:   08 80 times \ times from target compiler! 11may93jaw
                    135: DOES>   ( u -- )
                    136:   swap
                    137:   0 max 0 ?DO  I' I - &80 min 2dup type  +LOOP  drop ;
                    138: hex
                    139: [THEN]
                    140: 

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