File:  [gforth] / gforth / growable.fs
Revision 1.4: download - view: text, annotated - select for diffs
Mon Dec 31 19:02:24 2007 UTC (11 years, 8 months ago) by anton
Branches: MAIN
CVS tags: v0-7-0, HEAD
updated copyright year after changing license notice

    1: \ growable buffers/array
    2: 
    3: \ Copyright (C) 2000,2007 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 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: struct
   21:     cell% field growable-address1
   22:     cell% field growable-size
   23: end-struct growable%
   24: 
   25: : init-growable ( growable -- )
   26:     0 over growable-address1 !
   27:     1 cells swap growable-size ! ;
   28: 
   29: : grow-to ( u growable -- )
   30:     \ grow growable to at least u aus
   31:     dup >r growable-size @ begin
   32: 	2dup u> while
   33: 	2* repeat
   34:     nip r@ growable-address1 @ over resize throw
   35:     \ !! assumptions: resize with current address 0 is allocate;
   36:     \ resizing to the current size is cheap
   37:     r@ growable-address1 !
   38:     r> growable-size ! ;
   39: 
   40: : growable-addr ( offset growable -- address )
   41:     \ address at offset within growable
   42:     growable-address1 @ + ;
   43: 
   44: : fit-growable ( offset usize growable -- address )
   45:     \ address is at offset within growable; growable becomes large
   46:     \ enough to have an object of size usize there
   47:     >r over + r@ grow-to
   48:     r> growable-addr ;
   49: 
   50: false [if] \ test code
   51: 
   52: growable% %allot constant x
   53: x init-growable
   54: x growable-size ?
   55: 10 x grow-to
   56: x growable-size ?
   57: 4 x growable-addr hex.
   58: 12 8 x fit-growable hex.
   59: x growable-size ?
   60: .s
   61: 
   62: [then]
   63: 

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