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; C4

; Copyright (c) 2002 Thomas Mathys

; killer@vantage.ch

;

; This file is part of C4.

;

; C4 is free software; you can redistribute it and/or modify

; it under the terms of the GNU General Public License as published by

; the Free Software Foundation; either version 2 of the License, or

; (at your option) any later version.

;

; C4 is distributed in the hope that it will be useful,

; but WITHOUT ANY WARRANTY; without even the implied warranty of

; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

; GNU General Public License for more details.

;

; You should have received a copy of the GNU General Public License

; along with C4; if not, write to the Free Software

; Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

%ifndef _RNG_INC

%define _RNG_INC

	section .data

; random seed

seed		dd	0

	section .text

;**********************************************************

; randomize

; initialize random number generator.

; initialization is done using the get system clock syscall

;

; input		:	nothing

; output	:	nothing

; destroys	:	nothing

;**********************************************************

randomize:

	push eax

	mov eax,MOS_SC_GETSYSCLOCK

	int 0x40

	mov [seed],eax

	pop eax

	ret

;**********************************************************

; rand

; return an unsigned 32 bit "random" number

;

; input		:	nothing

; output	:	eax = unsigned 32 bit random number

; destroys	:	nothing

;**********************************************************

rand:

	pushfd

	push edx

	mov eax,32719

	mul dword [seed]

	add eax,123

	xchg al,ah

	rol eax,16

	xchg al,ah

	mov [seed],eax

	pop edx

	popfd

	ret

%endif