140 lines
3.8 KiB
NASM
140 lines
3.8 KiB
NASM
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; Command & Conquer Red Alert(tm)
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; Copyright 2025 Electronic Arts Inc.
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;
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; This program is free software: you can redistribute it and/or modify
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; it under the terms of the GNU General Public License as published by
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; the Free Software Foundation, either version 3 of the License, or
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; (at your option) any later version.
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;
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; This program is distributed in the hope that it will be useful,
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; but WITHOUT ANY WARRANTY; without even the implied warranty of
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; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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; GNU General Public License for more details.
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;
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; You should have received a copy of the GNU General Public License
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; along with this program. If not, see <http://www.gnu.org/licenses/>.
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;
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; $Header: g:/library/wwlib32/misc/rcs/reverse.asm 1.3 1994/04/25 12:22:45 scott_bowen Exp $
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;***************************************************************************
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;** C O N F I D E N T I A L --- W E S T W O O D A S S O C I A T E S **
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;***************************************************************************
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;* *
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;* Project Name : LIBRARY *
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;* *
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;* File Name : REVERSE.ASM *
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;* *
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;* Programmer : Christopher Yates *
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;* *
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;* Last Update : April 20, 1994 [SKB] *
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;* *
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;*-------------------------------------------------------------------------*
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;* Functions: *
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;* *
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; LONG Reverse_LONG(LONG number); *
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; WORD Reverse_WORD(WORD number); *
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; LONG Swap_LONG(LONG number);
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;* *
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;* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - *
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IDEAL
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P386
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MODEL USE32 FLAT
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GLOBAL Reverse_WORD :NEAR
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GLOBAL Swap_LONG :NEAR
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GLOBAL Reverse_LONG :NEAR
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CODESEG
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; ----------------------------------------------------------------
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;
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; Here are prototypes for the routines defined within this module:
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;
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; LONG Reverse_LONG(LONG number);
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; WORD Reverse_WORD(WORD number);
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; LONG Swap_LONG(LONG number);
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;
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; ----------------------------------------------------------------
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;-----------------------------------------------------------------
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;
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; REVERSE_LONG
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;
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; LONG Reverse_LONG(LONG number);
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;
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;*
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PROC Reverse_LONG C near
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ARG number:DWORD
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IF 1
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mov eax,[DWORD PTR number]
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xchg al,ah
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ror eax,16
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xchg al,ah
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ELSE
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; This is old 16 bit code.
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mov ax,[WORD PTR number]
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mov dx,[WORD PTR number+2]
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xchg ah,dl
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xchg al,dh
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ENDIF
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ret
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ENDP Reverse_LONG
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;-----------------------------------------------------------------
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;-----------------------------------------------------------------
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;
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; REVERSE_WORD
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;
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; WORD Reverse_WORD(WORD number);
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;
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;*
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PROC Reverse_WORD C near
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ARG number:WORD
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mov ax,[number]
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xchg ah,al
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ret
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ENDP Reverse_WORD
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;-----------------------------------------------------------------
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;-----------------------------------------------------------------
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;
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; SWAP_LONG
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;
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; LONG Swap_LONG(LONG number);
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;
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;*
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PROC Swap_LONG C near
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ARG number:DWORD
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IF 1
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; 32 bit code.
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mov eax,[DWORD PTR number]
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ror eax,16
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ELSE
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; 16 bit code.
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mov ax,[WORD PTR number+2]
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mov dx,[WORD PTR number]
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ENDIF
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ret
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ENDP Swap_LONG
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;-----------------------------------------------------------------
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END
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