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| 1 : | anton | 1.1 | \ growable buffers/array |
| 2 : | |||
| 3 : | \ Copyright (C) 2000 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 : | struct | ||
| 22 : | cell% field growable-address1 | ||
| 23 : | cell% field growable-size | ||
| 24 : | end-struct growable% | ||
| 25 : | |||
| 26 : | : init-growable ( growable -- ) | ||
| 27 : | 0 over growable-address1 ! | ||
| 28 : | 1 cells swap growable-size ! ; | ||
| 29 : | |||
| 30 : | : grow-to ( u growable -- ) | ||
| 31 : | \ grow growable to at least u aus | ||
| 32 : | dup >r growable-size @ begin | ||
| 33 : | 2dup u> while | ||
| 34 : | 2* repeat | ||
| 35 : | nip r@ growable-address1 @ over resize throw | ||
| 36 : | \ !! assumptions: resize with current address 0 is allocate; | ||
| 37 : | \ resizing to the current size is cheap | ||
| 38 : | r@ growable-address1 ! | ||
| 39 : | r> growable-size ! ; | ||
| 40 : | |||
| 41 : | : growable-addr ( offset growable -- address ) | ||
| 42 : | \ address at offset within growable | ||
| 43 : | growable-address1 @ + ; | ||
| 44 : | |||
| 45 : | : fit-growable ( offset usize growable -- address ) | ||
| 46 : | \ address is at offset within growable; growable becomes large | ||
| 47 : | \ enough to have an object of size usize there | ||
| 48 : | >r over + r@ grow-to | ||
| 49 : | r> growable-addr ; | ||
| 50 : | |||
| 51 : | false [if] \ test code | ||
| 52 : | |||
| 53 : | growable% %allot constant x | ||
| 54 : | x init-growable | ||
| 55 : | x growable-size ? | ||
| 56 : | 10 x grow-to | ||
| 57 : | x growable-size ? | ||
| 58 : | 4 x growable-addr hex. | ||
| 59 : | 12 8 x fit-growable hex. | ||
| 60 : | x growable-size ? | ||
| 61 : | .s | ||
| 62 : | |||
| 63 : | [then] | ||
| 64 : |
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