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| 1 : | pazsan | 1.5 | \ A less simple implementation of the blocks wordset. |
| 2 : | anton | 1.1 | |
| 3 : | anton | 1.7 | \ Copyright (C) 1995 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., 675 Mass Ave, Cambridge, MA 02139, USA. | ||
| 20 : | |||
| 21 : | |||
| 22 : | \ A more efficient implementation would use mmap on OSs that | ||
| 23 : | anton | 1.1 | \ provide it and many buffers on OSs that do not provide mmap. |
| 24 : | |||
| 25 : | pazsan | 1.5 | \ Now, the replacement algorithm is "direct mapped"; change to LRU |
| 26 : | \ if too slow. Using more buffers helps, too. | ||
| 27 : | |||
| 28 : | anton | 1.1 | \ I think I avoid the assumption 1 char = 1 here, but I have not tested this |
| 29 : | |||
| 30 : | pazsan | 1.2 | \ 1024 constant chars/block \ mandated by the standard |
| 31 : | anton | 1.1 | |
| 32 : | pazsan | 1.5 | require struct.fs |
| 33 : | |||
| 34 : | struct | ||
| 35 : | 1 cells: field buffer-block \ the block number | ||
| 36 : | 1 cells: field buffer-fid \ the block's fid | ||
| 37 : | 1 cells: field buffer-dirty \ the block dirty flag | ||
| 38 : | chars/block chars: field block-buffer \ the data | ||
| 39 : | 0 cells: field next-buffer | ||
| 40 : | end-struct buffer-struct | ||
| 41 : | |||
| 42 : | Variable block-buffers | ||
| 43 : | Variable last-block | ||
| 44 : | |||
| 45 : | $20 Value buffers | ||
| 46 : | |||
| 47 : | User block-fid | ||
| 48 : | anton | 1.1 | |
| 49 : | pazsan | 1.5 | : block-cold |
| 50 : | defers 'cold block-fid off last-block off | ||
| 51 : | buffers buffer-struct drop * allocate throw dup block-buffers ! | ||
| 52 : | buffers buffer-struct drop * erase ; | ||
| 53 : | anton | 1.1 | |
| 54 : | pazsan | 1.5 | ' block-cold IS 'cold |
| 55 : | |||
| 56 : | block-cold | ||
| 57 : | |||
| 58 : | Defer flush-file | ||
| 59 : | |||
| 60 : | : use-file ( addr u -- ) | ||
| 61 : | pazsan | 1.8 | 2dup ['] open-path-file catch 0<> |
| 62 : | pazsan | 1.5 | if |
| 63 : | pazsan | 1.8 | 2drop r/w bin create-file throw |
| 64 : | pazsan | 1.5 | else |
| 65 : | pazsan | 1.8 | rot close-file throw 2dup file-status throw bin open-file throw |
| 66 : | >r 2drop r> | ||
| 67 : | pazsan | 1.5 | then |
| 68 : | pazsan | 1.6 | block-fid @ IF flush-file block-fid @ close-file throw THEN |
| 69 : | pazsan | 1.5 | block-fid ! ; |
| 70 : | pazsan | 1.8 | |
| 71 : | : use ( "file" -- ) | ||
| 72 : | name use-file ; | ||
| 73 : | anton | 1.1 | |
| 74 : | anton | 1.3 | \ the file is opened as binary file, since it either will contain text |
| 75 : | \ without newlines or binary data | ||
| 76 : | anton | 1.1 | : get-block-fid ( -- fid ) |
| 77 : | block-fid @ 0= | ||
| 78 : | if | ||
| 79 : | pazsan | 1.5 | s" blocks.fb" use-file |
| 80 : | anton | 1.1 | then |
| 81 : | block-fid @ ; | ||
| 82 : | |||
| 83 : | : block-position ( u -- ) | ||
| 84 : | \ positions the block file to the start of block u | ||
| 85 : | anton | 1.3 | 1- chars/block chars um* get-block-fid reposition-file throw ; |
| 86 : | anton | 1.1 | |
| 87 : | : update ( -- ) | ||
| 88 : | pazsan | 1.5 | last-block @ ?dup IF buffer-dirty on THEN ; |
| 89 : | anton | 1.1 | |
| 90 : | pazsan | 1.5 | : save-buffer ( buffer -- ) >r |
| 91 : | r@ buffer-dirty @ r@ buffer-block @ 0<> and | ||
| 92 : | anton | 1.1 | if |
| 93 : | pazsan | 1.5 | r@ buffer-block @ block-position |
| 94 : | r@ block-buffer chars/block r@ buffer-fid @ write-file throw | ||
| 95 : | r@ buffer-dirty off | ||
| 96 : | endif | ||
| 97 : | rdrop ; | ||
| 98 : | |||
| 99 : | : empty-buffer ( buffer -- ) | ||
| 100 : | buffer-block off ; | ||
| 101 : | |||
| 102 : | : save-buffers ( -- ) block-buffers @ | ||
| 103 : | buffers 0 ?DO dup save-buffer next-buffer LOOP drop ; | ||
| 104 : | anton | 1.1 | |
| 105 : | pazsan | 1.5 | : empty-buffers ( -- ) block-buffers @ |
| 106 : | buffers 0 ?DO dup empty-buffer next-buffer LOOP drop ; | ||
| 107 : | anton | 1.1 | |
| 108 : | : flush ( -- ) | ||
| 109 : | save-buffers | ||
| 110 : | empty-buffers ; | ||
| 111 : | |||
| 112 : | pazsan | 1.5 | ' flush IS flush-file |
| 113 : | |||
| 114 : | : get-buffer ( n -- a-addr ) | ||
| 115 : | buffers mod buffer-struct drop * block-buffers @ + ; | ||
| 116 : | |||
| 117 : | anton | 1.1 | : block ( u -- a-addr ) |
| 118 : | dup 0= -35 and throw | ||
| 119 : | pazsan | 1.5 | dup get-buffer >r |
| 120 : | dup r@ buffer-block @ <> | ||
| 121 : | pazsan | 1.9 | r@ buffer-fid @ block-fid @ <> or |
| 122 : | anton | 1.1 | if |
| 123 : | pazsan | 1.5 | r@ save-buffer |
| 124 : | anton | 1.1 | dup block-position |
| 125 : | pazsan | 1.5 | r@ block-buffer chars/block get-block-fid read-file throw |
| 126 : | anton | 1.1 | \ clear the rest of the buffer if the file is too short |
| 127 : | pazsan | 1.5 | r@ block-buffer over chars + chars/block rot chars - blank |
| 128 : | r@ buffer-block ! | ||
| 129 : | get-block-fid r@ buffer-fid ! | ||
| 130 : | anton | 1.1 | else |
| 131 : | drop | ||
| 132 : | then | ||
| 133 : | pazsan | 1.5 | r> dup last-block ! block-buffer ; |
| 134 : | anton | 1.1 | |
| 135 : | : buffer ( u -- a-addr ) | ||
| 136 : | \ reading in the block is unnecessary, but simpler | ||
| 137 : | block ; | ||
| 138 : | |||
| 139 : | pazsan | 1.2 | User scr 0 scr ! |
| 140 : | anton | 1.1 | |
| 141 : | pazsan | 1.5 | : updated? ( n -- f ) scr @ buffer |
| 142 : | [ 0 buffer-dirty 0 block-buffer - ] Literal + @ ; | ||
| 143 : | |||
| 144 : | anton | 1.1 | : list ( u -- ) |
| 145 : | \ calling block again and again looks inefficient but is necessary | ||
| 146 : | \ in a multitasking environment | ||
| 147 : | dup scr ! | ||
| 148 : | pazsan | 1.5 | ." Screen " u. |
| 149 : | updated? 0= IF ." not " THEN ." modified " cr | ||
| 150 : | anton | 1.1 | 16 0 |
| 151 : | ?do | ||
| 152 : | anton | 1.4 | i 2 .r space scr @ block i 64 * chars + 64 type cr |
| 153 : | anton | 1.1 | loop ; |
| 154 : | |||
| 155 : | pazsan | 1.2 | : (source) ( -- addr len ) |
| 156 : | blk @ ?dup | ||
| 157 : | IF block chars/block | ||
| 158 : | ELSE tib #tib @ | ||
| 159 : | THEN ; | ||
| 160 : | |||
| 161 : | ' (source) IS source | ||
| 162 : | |||
| 163 : | : load ( i*x n -- j*x ) | ||
| 164 : | push-file | ||
| 165 : | dup loadline ! blk ! >in off ( ['] ) interpret ( catch ) | ||
| 166 : | pop-file ( throw ) ; | ||
| 167 : | anton | 1.1 | |
| 168 : | pazsan | 1.2 | : thru ( i*x n1 n2 -- j*x ) |
| 169 : | 1+ swap 0 ?DO I load LOOP ; | ||
| 170 : | anton | 1.1 | |
| 171 : | pazsan | 1.2 | : +load ( i*x n -- j*x ) blk @ + load ; |
| 172 : | |||
| 173 : | : +thru ( i*x n1 n2 -- j*x ) | ||
| 174 : | 1+ swap 0 ?DO I +load LOOP ; | ||
| 175 : | anton | 1.4 | |
| 176 : | pazsan | 1.5 | : --> ( -- ) refill drop ; immediate |
| 177 : | |||
| 178 : | : block-included ( addr u -- ) | ||
| 179 : | block-fid @ >r block-fid off use-file | ||
| 180 : | 1 load block-fid @ close-file throw flush | ||
| 181 : | r> block-fid ! ; | ||
| 182 : | |||
| 183 : | : include ( "name" -- ) | ||
| 184 : | name 2dup dup 3 - /string s" .fb" compare | ||
| 185 : | 0= IF block-included ELSE included THEN ; | ||
| 186 : | |||
| 187 : | anton | 1.4 | get-current environment-wordlist set-current |
| 188 : | true constant block | ||
| 189 : | true constant block-ext | ||
| 190 : | set-current | ||
| 191 : | pazsan | 1.5 | |
| 192 : | : bye ['] flush catch drop bye ; |
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