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Conversion to ANSI style (not completed yet).

/*
 * Copyright (c) 1994-2000 FUJITSU LABORATORIES LIMITED 
 * All rights reserved.
 * 
 * FUJITSU LABORATORIES LIMITED ("FLL") hereby grants you a limited,
 * non-exclusive and royalty-free license to use, copy, modify and
 * redistribute, solely for non-commercial and non-profit purposes, the
 * computer program, "Risa/Asir" ("SOFTWARE"), subject to the terms and
 * conditions of this Agreement. For the avoidance of doubt, you acquire
 * only a limited right to use the SOFTWARE hereunder, and FLL or any
 * third party developer retains all rights, including but not limited to
 * copyrights, in and to the SOFTWARE.
 * 
 * (1) FLL does not grant you a license in any way for commercial
 * purposes. You may use the SOFTWARE only for non-commercial and
 * non-profit purposes only, such as academic, research and internal
 * business use.
 * (2) The SOFTWARE is protected by the Copyright Law of Japan and
 * international copyright treaties. If you make copies of the SOFTWARE,
 * with or without modification, as permitted hereunder, you shall affix
 * to all such copies of the SOFTWARE the above copyright notice.
 * (3) An explicit reference to this SOFTWARE and its copyright owner
 * shall be made on your publication or presentation in any form of the
 * results obtained by use of the SOFTWARE.
 * (4) In the event that you modify the SOFTWARE, you shall notify FLL by
 * e-mail at risa-admin@sec.flab.fujitsu.co.jp of the detailed specification
 * for such modification or the source code of the modified part of the
 * SOFTWARE.
 * 
 * THE SOFTWARE IS PROVIDED AS IS WITHOUT ANY WARRANTY OF ANY KIND. FLL
 * MAKES ABSOLUTELY NO WARRANTIES, EXPRESSED, IMPLIED OR STATUTORY, AND
 * EXPRESSLY DISCLAIMS ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE OR NONINFRINGEMENT OF THIRD PARTIES'
 * RIGHTS. NO FLL DEALER, AGENT, EMPLOYEES IS AUTHORIZED TO MAKE ANY
 * MODIFICATIONS, EXTENSIONS, OR ADDITIONS TO THIS WARRANTY.
 * UNDER NO CIRCUMSTANCES AND UNDER NO LEGAL THEORY, TORT, CONTRACT,
 * OR OTHERWISE, SHALL FLL BE LIABLE TO YOU OR ANY OTHER PERSON FOR ANY
 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, PUNITIVE OR CONSEQUENTIAL
 * DAMAGES OF ANY CHARACTER, INCLUDING, WITHOUT LIMITATION, DAMAGES
 * ARISING OUT OF OR RELATING TO THE SOFTWARE OR THIS AGREEMENT, DAMAGES
 * FOR LOSS OF GOODWILL, WORK STOPPAGE, OR LOSS OF DATA, OR FOR ANY
 * DAMAGES, EVEN IF FLL SHALL HAVE BEEN INFORMED OF THE POSSIBILITY OF
 * SUCH DAMAGES, OR FOR ANY CLAIM BY ANY OTHER PARTY. EVEN IF A PART
 * OF THE SOFTWARE HAS BEEN DEVELOPED BY A THIRD PARTY, THE THIRD PARTY
 * DEVELOPER SHALL HAVE NO LIABILITY IN CONNECTION WITH THE USE,
 * PERFORMANCE OR NON-PERFORMANCE OF THE SOFTWARE.
 *
 * $OpenXM: OpenXM_contrib2/asir2000/engine/num.c,v 1.6 2001/10/09 01:36:13 noro Exp $ 
*/
#include "ca.h"

void addnum(VL vl,Num a,Num b,Num *c)
{
	(*addnumt[MAX(a?NID(a):0,b?NID(b):0)])(a,b,c);
}

void subnum(VL vl,Num a,Num b,Num *c)
{
	(*subnumt[MAX(a?NID(a):0,b?NID(b):0)])(a,b,c);
}

void mulnum(VL vl,Num a,Num b,Num *c)
{
	(*mulnumt[MAX(a?NID(a):0,b?NID(b):0)])(a,b,c);
}

void divnum(VL vl,Num a,Num b,Num *c)
{
	(*divnumt[MAX(a?NID(a):0,b?NID(b):0)])(a,b,c);
}

void pwrnum(VL vl,Num a,Num b,Num *c)
{
	(*pwrnumt[MAX(a?NID(a):0,b?NID(b):0)])(a,b,c);
}

void chsgnnum(Num a,Num *c)
{
	(*chsgnnumt[a?NID(a):0])(a,c);
}

int compnum(VL vl,Num a,Num b)
{
	return (*cmpnumt[MAX(a?NID(a):0,b?NID(b):0)])(a,b);
}

extern int current_ff;

void one_ff(Num *c)
{
	LM lm;
	GFS fs;
	GFSN fspn;

	switch ( current_ff ) {
		case FF_GFP:
		case FF_GFPN:
			MKLM(ONEN,lm);
			*c = (Num)lm;
			break;
		case FF_GFS:
			mqtogfs(ONEM,&fs);
			*c = (Num)fs;
			break;
		case FF_GFSN:
			ntogfsn((Obj)ONE,&fspn);
			*c = (Num)fspn;
			break;
		default:
			error("one_ff : not implemented yet");
	}
}

int negative_number(Num c)
{
	if ( !c )
		return 0;
	else {
		switch ( NID(c) ) {
			case N_Q:
				return SGN((Q)c)<0;
			case N_R:
				return BDY((Real)c)<0;
			case N_B:
				return 0; /* XXX */
			default:
				return 0;
		}
	}
}

/* general simplifier for finite field elements */
/* XXX : we don't have appropriate file */

void simp_ff(Obj p,Obj *rp)
{
	LM s;
	DCP dc,dcr0,dcr;
	GF2N rg,sg;
	GFPN rpn,spn;
	GFS rs;
	GFSN rspn,sspn;
	P t;
	Obj obj;

	lm_lazy = 0;
	if ( !p )
		*rp = 0;
	else if ( OID(p) == O_N ) {
		switch ( current_ff ) {
			case FF_GFP:
				ptolmp((P)p,&t); simplm((LM)t,&s); *rp = (Obj)s;
				break;
			case FF_GF2N:
				ptogf2n((Obj)p,&rg); simpgf2n((GF2N)rg,&sg); *rp = (Obj)sg;
				break;
			case FF_GFPN:
				ntogfpn((Obj)p,&rpn); simpgfpn((GFPN)rpn,&spn); *rp = (Obj)spn;
				break;
			case FF_GFS:
				if ( NID((Num)p) == N_GFS )
					*rp = p;
				else {
					ptomp(current_gfs_p,(P)p,&t); mqtogfs((MQ)t,&rs);
					*rp = (Obj)rs;
				} 
				break;
			case FF_GFSN:
				ntogfsn((Obj)p,&rspn); simpgfsn((GFSN)rspn,&sspn);
				*rp = (Obj)sspn;
				break;
			default:
				*rp = (Obj)p;
				break;
		}
	} else if ( OID(p) == O_P ) {
		for ( dc = DC((P)p), dcr0 = 0; dc; dc = NEXT(dc) ) {
			simp_ff((Obj)COEF(dc),&obj);
			if ( obj ) {
				NEXTDC(dcr0,dcr); DEG(dcr) = DEG(dc); COEF(dcr) = (P)obj;
			}
		}
		if ( !dcr0 ) 
			*rp = 0;
		else {
			NEXT(dcr) = 0; MKP(VR((P)p),dcr0,t); *rp = (Obj)t;
		}
	} else
		error("simp_ff : not implemented yet");
}


void field_order_ff(N *order)
{
	UP2 up2;
	UP up;
	UM dp;
	N m;
	int d,w;

	switch ( current_ff ) {
		case FF_GFP:
			getmod_lm(order); break;
		case FF_GF2N:
			getmod_gf2n(&up2); d = degup2(up2);
			w = (d>>5)+1;
			*order = m = NALLOC(w);
			PL(m)=w;
			bzero((char *)BD(m),w*sizeof(unsigned int));
			BD(m)[d>>5] |= 1<<(d&31);
			break;
		case FF_GFPN:
			getmod_lm(&m);
			getmod_gfpn(&up); pwrn(m,up->d,order);
			break;
		case FF_GFS:
			STON(current_gfs_q,*order); break;
		case FF_GFSN:
			STON(current_gfs_q,m);
			getmod_gfsn(&dp); pwrn(m,DEG(dp),order);
			break;
		default:
			error("field_order_ff : current_ff is not set");
	}
}