===================================================================
RCS file: /home/cvs/OpenXM_contrib2/asir2000/engine/Fgfs.c,v
retrieving revision 1.21
retrieving revision 1.22
diff -u -p -r1.21 -r1.22
--- OpenXM_contrib2/asir2000/engine/Fgfs.c	2004/04/03 05:52:56	1.21
+++ OpenXM_contrib2/asir2000/engine/Fgfs.c	2018/03/29 01:32:51	1.22
@@ -1,4 +1,4 @@
-/* $OpenXM: OpenXM_contrib2/asir2000/engine/Fgfs.c,v 1.20 2004/02/03 23:31:57 noro Exp $ */
+/* $OpenXM: OpenXM_contrib2/asir2000/engine/Fgfs.c,v 1.21 2004/04/03 05:52:56 noro Exp $ */
 
 #include "ca.h"
 
@@ -27,737 +27,737 @@ void sfbm_to_gfsn_univariate(BM f,V x,V y,P *r);
 
 void monomialfctr_sf(VL vl,P p,P *pr,DCP *dcp)
 {
-	VL nvl,avl;
-	Q d;
-	P f,t,s;
-	DCP dc0,dc;
-	Obj obj;
+  VL nvl,avl;
+  Q d;
+  P f,t,s;
+  DCP dc0,dc;
+  Obj obj;
 
-	clctv(vl,p,&nvl);
-	for ( dc0 = 0, avl = nvl, f = p; avl; avl = NEXT(avl) ) {
-		getmindeg(avl->v,f,&d);
-		if ( d ) {
-			MKV(avl->v,t); 
-			simp_ff((Obj)t,&obj); t = (P)obj;
-			NEXTDC(dc0,dc); DEG(dc) = d; COEF(dc) = t;
-			pwrp(vl,t,d,&s); divsp(vl,f,s,&t); f = t;
-		}
-	}
-	if ( dc0 )
-		NEXT(dc) = 0;
-	*pr = f; *dcp = dc0;
+  clctv(vl,p,&nvl);
+  for ( dc0 = 0, avl = nvl, f = p; avl; avl = NEXT(avl) ) {
+    getmindeg(avl->v,f,&d);
+    if ( d ) {
+      MKV(avl->v,t); 
+      simp_ff((Obj)t,&obj); t = (P)obj;
+      NEXTDC(dc0,dc); DEG(dc) = d; COEF(dc) = t;
+      pwrp(vl,t,d,&s); divsp(vl,f,s,&t); f = t;
+    }
+  }
+  if ( dc0 )
+    NEXT(dc) = 0;
+  *pr = f; *dcp = dc0;
 }
 
 void lex_lc(P f,P *c)
 {
-	if ( !f || NUM(f) )
-		*c = f;
-	else
-		lex_lc(COEF(DC(f)),c);
+  if ( !f || NUM(f) )
+    *c = f;
+  else
+    lex_lc(COEF(DC(f)),c);
 }
 
 DCP append_dc(DCP dc,DCP dct)
 {
-	DCP dcs;
+  DCP dcs;
 
-	if ( !dc )
-		return dct;
-	else {
-		for ( dcs = dc; NEXT(dcs); dcs = NEXT(dcs) );
-		NEXT (dcs) = dct;
-		return dc;
-	}
+  if ( !dc )
+    return dct;
+  else {
+    for ( dcs = dc; NEXT(dcs); dcs = NEXT(dcs) );
+    NEXT (dcs) = dct;
+    return dc;
+  }
 }
 
 void sqfrsf(VL vl, P f, DCP *dcp)
 {
-	DCP dc,dct;
-	Obj obj;
-	P t,s,c,cont;
-	VL tvl,onevl;
+  DCP dc,dct;
+  Obj obj;
+  P t,s,c,cont;
+  VL tvl,onevl;
 
-	simp_ff((Obj)f,&obj); f = (P)obj;
-	lex_lc(f,&c); divsp(vl,f,c,&t); f = t;
-	monomialfctr_sf(vl,f,&t,&dc); f = t;
-	clctv(vl,f,&tvl); vl = tvl;
-	NEWVL(onevl); NEXT(onevl)=0;
-	if ( !vl )
-		;
-	else if ( !NEXT(vl) ) {
-		sfusqfr(f,&dct);
-		dc = append_dc(dc,NEXT(dct));
-	} else {
-		t = f;
-		for ( tvl = vl; tvl; tvl = NEXT(tvl) ) {
-			onevl->v = tvl->v;
-			cont_pp_mv_sf(vl,onevl,t,&cont,&s); t = s;
-			sqfrsf(vl,cont,&dct);
-			dc = append_dc(dc,NEXT(dct));
-		}
-		sqfrsfmain(vl,t,&dct);
-		dc = append_dc(dc,dct);
-	}
-	NEWDC(dct); DEG(dct) = ONE; COEF(dct) = (P)c; NEXT(dct) = dc;
-	*dcp = dct;
+  simp_ff((Obj)f,&obj); f = (P)obj;
+  lex_lc(f,&c); divsp(vl,f,c,&t); f = t;
+  monomialfctr_sf(vl,f,&t,&dc); f = t;
+  clctv(vl,f,&tvl); vl = tvl;
+  NEWVL(onevl); NEXT(onevl)=0;
+  if ( !vl )
+    ;
+  else if ( !NEXT(vl) ) {
+    sfusqfr(f,&dct);
+    dc = append_dc(dc,NEXT(dct));
+  } else {
+    t = f;
+    for ( tvl = vl; tvl; tvl = NEXT(tvl) ) {
+      onevl->v = tvl->v;
+      cont_pp_mv_sf(vl,onevl,t,&cont,&s); t = s;
+      sqfrsf(vl,cont,&dct);
+      dc = append_dc(dc,NEXT(dct));
+    }
+    sqfrsfmain(vl,t,&dct);
+    dc = append_dc(dc,dct);
+  }
+  NEWDC(dct); DEG(dct) = ONE; COEF(dct) = (P)c; NEXT(dct) = dc;
+  *dcp = dct;
 }
 
 void sqfrsfmain(VL vl,P f,DCP *dcp)
 {
-	VL tvl;
-	DCP dc,dct,dcs;
-	P t,s;
-	Q m,m1;
-	V v;
+  VL tvl;
+  DCP dc,dct,dcs;
+  P t,s;
+  Q m,m1;
+  V v;
 
-	clctv(vl,f,&tvl); vl = tvl;
-	dc = 0;
-	t = f;
-	for ( tvl = vl; tvl; tvl = NEXT(tvl) ) {
-		v = tvl->v;
-		partial_sqfrsf(vl,v,t,&s,&dct); t = s;
-		dc = append_dc(dc,dct);
-	}
-	if ( !NUM(t) ) {
-		STOQ(characteristic_sf(),m);
-		pthrootsf(t,m,&s);
-		sqfrsfmain(vl,s,&dct);
-		for ( dcs = dct; dcs; dcs = NEXT(dcs) ) {
-			mulq(DEG(dcs),m,&m1); DEG(dcs) = m1;
-		}
-		dc = append_dc(dc,dct);
-	}
-	*dcp = dc;
+  clctv(vl,f,&tvl); vl = tvl;
+  dc = 0;
+  t = f;
+  for ( tvl = vl; tvl; tvl = NEXT(tvl) ) {
+    v = tvl->v;
+    partial_sqfrsf(vl,v,t,&s,&dct); t = s;
+    dc = append_dc(dc,dct);
+  }
+  if ( !NUM(t) ) {
+    STOQ(characteristic_sf(),m);
+    pthrootsf(t,m,&s);
+    sqfrsfmain(vl,s,&dct);
+    for ( dcs = dct; dcs; dcs = NEXT(dcs) ) {
+      mulq(DEG(dcs),m,&m1); DEG(dcs) = m1;
+    }
+    dc = append_dc(dc,dct);
+  }
+  *dcp = dc;
 }
 
 void pthrootsf(P f,Q m,P *r)
 {
-	DCP dc,dc0,dct;
-	N qn,rn;
+  DCP dc,dc0,dct;
+  N qn,rn;
 
-	if ( NUM(f) )
-		pthrootgfs(f,r);
-	else {
-		dc = DC(f);
-		dc0 = 0;
-		for ( dc0 = 0; dc; dc = NEXT(dc) ) {
-			NEXTDC(dc0,dct);
-			pthrootsf(COEF(dc),m,&COEF(dct));
-			if ( DEG(dc) ) {
-				divn(NM(DEG(dc)),NM(m),&qn,&rn);
-				if ( rn )
-					error("pthrootsf : cannot happen");
-				NTOQ(qn,1,DEG(dct));
-			} else
-				DEG(dct) = 0;
-		}
-		NEXT(dct) = 0;
-		MKP(VR(f),dc0,*r);
-	}
+  if ( NUM(f) )
+    pthrootgfs(f,r);
+  else {
+    dc = DC(f);
+    dc0 = 0;
+    for ( dc0 = 0; dc; dc = NEXT(dc) ) {
+      NEXTDC(dc0,dct);
+      pthrootsf(COEF(dc),m,&COEF(dct));
+      if ( DEG(dc) ) {
+        divn(NM(DEG(dc)),NM(m),&qn,&rn);
+        if ( rn )
+          error("pthrootsf : cannot happen");
+        NTOQ(qn,1,DEG(dct));
+      } else
+        DEG(dct) = 0;
+    }
+    NEXT(dct) = 0;
+    MKP(VR(f),dc0,*r);
+  }
 }
 
 void partial_sqfrsf(VL vl,V v,P f,P *r,DCP *dcp)
 {
-	P ps[2];
-	DCP dc0,dc;
-	int m;
-	P t,flat,flat1,g,df,q;
+  P ps[2];
+  DCP dc0,dc;
+  int m;
+  P t,flat,flat1,g,df,q;
 
-	diffp(vl,f,v,&df);
-	if ( !df ) {
-		*dcp = 0;
-		*r = f;
-		return;
-	}
-	ps[0] = f; ps[1] = df;
-	gcdsf(vl,ps,2,&g);	
-	divsp(vl,f,g,&flat);
-	m = 0;
-	t = f;
-	dc0 = 0;
-	while ( !NUM(flat) ) {
-		while ( divtp(vl,t,flat,&q) ) {
-			t = q; m++;
-		}
-		ps[0] = t; ps[1] = flat;
-		gcdsf(vl,ps,2,&flat1);
-		divsp(vl,flat,flat1,&g);
-		flat = flat1;
-		NEXTDC(dc0,dc);
-		COEF(dc) = g;
-		STOQ(m,DEG(dc));
-	}
-	NEXT(dc) = 0;
-	*dcp = dc0;
-	*r = t;
+  diffp(vl,f,v,&df);
+  if ( !df ) {
+    *dcp = 0;
+    *r = f;
+    return;
+  }
+  ps[0] = f; ps[1] = df;
+  gcdsf(vl,ps,2,&g);  
+  divsp(vl,f,g,&flat);
+  m = 0;
+  t = f;
+  dc0 = 0;
+  while ( !NUM(flat) ) {
+    while ( divtp(vl,t,flat,&q) ) {
+      t = q; m++;
+    }
+    ps[0] = t; ps[1] = flat;
+    gcdsf(vl,ps,2,&flat1);
+    divsp(vl,flat,flat1,&g);
+    flat = flat1;
+    NEXTDC(dc0,dc);
+    COEF(dc) = g;
+    STOQ(m,DEG(dc));
+  }
+  NEXT(dc) = 0;
+  *dcp = dc0;
+  *r = t;
 }
 
 void gcdsf(VL vl,P *pa,int k,P *r)
 {
-	P *ps,*pl,*pm;
-	P **cp;
-	int *cn;
-	DCP *ml;
-	Obj obj;
-	int i,j,l,m;
-	P mg,mgsf,t;
-	VL avl,nvl,tvl,svl;
+  P *ps,*pl,*pm;
+  P **cp;
+  int *cn;
+  DCP *ml;
+  Obj obj;
+  int i,j,l,m;
+  P mg,mgsf,t;
+  VL avl,nvl,tvl,svl;
 
-	ps = (P *)ALLOCA(k*sizeof(P));
-	for ( i = 0, m = 0; i < k; i++ ) {
-		simp_ff((Obj)pa[i],&obj);
-		if ( obj )
-			ps[m++] = (P)obj;
-	}
-	if ( !m ) {
-		*r = 0;
-		return;
-	}
-	if ( m == 1 ) {
-		*r = ps[0];
-		return;
-	}
-	pl = (P *)ALLOCA(m*sizeof(P));
-	ml = (DCP *)ALLOCA(m*sizeof(DCP));
-	for ( i = 0; i < m; i++ )
-		monomialfctr(vl,ps[i],&pl[i],&ml[i]);
-	gcdmonomial(vl,ml,m,&mg); simp_ff((Obj)mg,&obj); mgsf = (P)obj;
-	for ( i = 0, nvl = vl, avl = 0; nvl && i < m; i++ ) {
-		clctv(vl,pl[i],&tvl);
-		intersectv(nvl,tvl,&svl); nvl = svl;
-		mergev(vl,avl,tvl,&svl); avl = svl;
-	}
-	if ( !nvl ) {
-		*r = mgsf;	
-		return;
-	}
-	if ( !NEXT(avl) ) {
-		ugcdsf(pl,m,&t);
-		mulp(vl,mgsf,t,r);	
-		return;
-	}
-	for ( tvl = nvl, i = 0; tvl; tvl = NEXT(tvl), i++ );
-	for ( tvl = avl, j = 0; tvl; tvl = NEXT(tvl), j++ );
-	if ( i == j ) {
-		/* all the pl[i]'s have the same variables */
-		gcdsf_main(avl,pl,m,&t);
-	} else {
-		cp = (P **)ALLOCA(m*sizeof(P *));
-		cn = (int *)ALLOCA(m*sizeof(int));
-		for ( i = 0; i < m; i++ ) {
-			cp[i] = (P *)ALLOCA(lengthp(pl[i])*sizeof(P));
-			cn[i] = pcoef(vl,nvl,pl[i],cp[i]);
-		}
-		for ( i = j = 0; i < m; i++ )
-			j += cn[i];
-		pm = (P *)ALLOCA(j*sizeof(P));
-		for ( i = l = 0; i < m; i++ )
-			for ( j = 0; j < cn[i]; j++ )
-				pm[l++] = cp[i][j];
-		gcdsf(vl,pm,l,&t);
-	}
-	mulp(vl,mgsf,t,r);	
+  ps = (P *)ALLOCA(k*sizeof(P));
+  for ( i = 0, m = 0; i < k; i++ ) {
+    simp_ff((Obj)pa[i],&obj);
+    if ( obj )
+      ps[m++] = (P)obj;
+  }
+  if ( !m ) {
+    *r = 0;
+    return;
+  }
+  if ( m == 1 ) {
+    *r = ps[0];
+    return;
+  }
+  pl = (P *)ALLOCA(m*sizeof(P));
+  ml = (DCP *)ALLOCA(m*sizeof(DCP));
+  for ( i = 0; i < m; i++ )
+    monomialfctr(vl,ps[i],&pl[i],&ml[i]);
+  gcdmonomial(vl,ml,m,&mg); simp_ff((Obj)mg,&obj); mgsf = (P)obj;
+  for ( i = 0, nvl = vl, avl = 0; nvl && i < m; i++ ) {
+    clctv(vl,pl[i],&tvl);
+    intersectv(nvl,tvl,&svl); nvl = svl;
+    mergev(vl,avl,tvl,&svl); avl = svl;
+  }
+  if ( !nvl ) {
+    *r = mgsf;  
+    return;
+  }
+  if ( !NEXT(avl) ) {
+    ugcdsf(pl,m,&t);
+    mulp(vl,mgsf,t,r);  
+    return;
+  }
+  for ( tvl = nvl, i = 0; tvl; tvl = NEXT(tvl), i++ );
+  for ( tvl = avl, j = 0; tvl; tvl = NEXT(tvl), j++ );
+  if ( i == j ) {
+    /* all the pl[i]'s have the same variables */
+    gcdsf_main(avl,pl,m,&t);
+  } else {
+    cp = (P **)ALLOCA(m*sizeof(P *));
+    cn = (int *)ALLOCA(m*sizeof(int));
+    for ( i = 0; i < m; i++ ) {
+      cp[i] = (P *)ALLOCA(lengthp(pl[i])*sizeof(P));
+      cn[i] = pcoef(vl,nvl,pl[i],cp[i]);
+    }
+    for ( i = j = 0; i < m; i++ )
+      j += cn[i];
+    pm = (P *)ALLOCA(j*sizeof(P));
+    for ( i = l = 0; i < m; i++ )
+      for ( j = 0; j < cn[i]; j++ )
+        pm[l++] = cp[i][j];
+    gcdsf(vl,pm,l,&t);
+  }
+  mulp(vl,mgsf,t,r);  
 }
 
 /* univariate gcd */
 
 void ugcdsf(P *pa,int m,P *r)
 {
-	P *ps;
-	int i;
-	UM w1,w2,w3,w;
-	int d;
-	V v;
+  P *ps;
+  int i;
+  UM w1,w2,w3,w;
+  int d;
+  V v;
 
-	if ( m == 1 ) {
-		*r = pa[0];
-		return;
-	}
-	for ( i = 0; i < m; i++ )
-		if ( NUM(pa[i]) ) {
-			itogfs(1,r);
-			return;
-		}
-	ps = (P *)ALLOCA(m*sizeof(P));
-	sort_by_deg(m,pa,ps);
-	v = VR(ps[m-1]);
-	d = getdeg(v,ps[m-1]);
-	w1 = W_UMALLOC(d);
-	w2 = W_UMALLOC(d);
-	w3 = W_UMALLOC(d);
-	ptosfum(ps[0],w1);
-	for ( i = 1; i < m; i++ ) {
-		ptosfum(ps[i],w2);
-		gcdsfum(w1,w2,w3); 
-		w = w1; w1 = w3; w3 = w;
-		if ( !DEG(w1) ) {
-			itogfs(1,r);
-			return;
-		}
-	}
-	sfumtop(v,w1,r);
+  if ( m == 1 ) {
+    *r = pa[0];
+    return;
+  }
+  for ( i = 0; i < m; i++ )
+    if ( NUM(pa[i]) ) {
+      itogfs(1,r);
+      return;
+    }
+  ps = (P *)ALLOCA(m*sizeof(P));
+  sort_by_deg(m,pa,ps);
+  v = VR(ps[m-1]);
+  d = getdeg(v,ps[m-1]);
+  w1 = W_UMALLOC(d);
+  w2 = W_UMALLOC(d);
+  w3 = W_UMALLOC(d);
+  ptosfum(ps[0],w1);
+  for ( i = 1; i < m; i++ ) {
+    ptosfum(ps[i],w2);
+    gcdsfum(w1,w2,w3); 
+    w = w1; w1 = w3; w3 = w;
+    if ( !DEG(w1) ) {
+      itogfs(1,r);
+      return;
+    }
+  }
+  sfumtop(v,w1,r);
 }
 
 /* deg(HT(p),v), where p is considered as distributed poly over F[v] */
 int gethdeg(VL vl,V v,P p)
 {
-	DCP dc;
-	Q dmax;
-	P cmax;
+  DCP dc;
+  Q dmax;
+  P cmax;
 
-	if ( !p )
-		return -1;
-	else if ( NUM(p) )
-		return 0;
-	else if ( VR(p) != v )
-		/* HT(p) = HT(lc(p))*x^D */
-		return gethdeg(vl,v,COEF(DC(p)));
-	else {
-		/* VR(p) = v */
-		dc = DC(p); dmax = DEG(dc); cmax = COEF(dc);
-		for ( dc = NEXT(dc); dc; dc = NEXT(dc) )
-			if ( compp(vl,COEF(dc),cmax) > 0 ) {
-				dmax = DEG(dc); cmax = COEF(dc);
-			}
-		return QTOS(dmax);
-	}
+  if ( !p )
+    return -1;
+  else if ( NUM(p) )
+    return 0;
+  else if ( VR(p) != v )
+    /* HT(p) = HT(lc(p))*x^D */
+    return gethdeg(vl,v,COEF(DC(p)));
+  else {
+    /* VR(p) = v */
+    dc = DC(p); dmax = DEG(dc); cmax = COEF(dc);
+    for ( dc = NEXT(dc); dc; dc = NEXT(dc) )
+      if ( compp(vl,COEF(dc),cmax) > 0 ) {
+        dmax = DEG(dc); cmax = COEF(dc);
+      }
+    return QTOS(dmax);
+  }
 }
 
 /* all the pa[i]'s have the same variables (=vl) */
 
 void gcdsf_main(VL vl,P *pa,int m,P *r)
 {
-	int nv,i,i0,imin,d,d0,d1,d2,dmin,index;
-	V v,v0,vmin;
-	VL tvl,nvl,rvl,nvl0,rvl0;
-	P *pc, *ps, *ph,*lps;
-	P x,t,cont,hg,g,hm,mod,s;
-	P hge,ge,ce,he,u,cof1e,mode,mod1,adj,cof1,coadj,q;
-	GFS sf;
+  int nv,i,i0,imin,d,d0,d1,d2,dmin,index;
+  V v,v0,vmin;
+  VL tvl,nvl,rvl,nvl0,rvl0;
+  P *pc, *ps, *ph,*lps;
+  P x,t,cont,hg,g,hm,mod,s;
+  P hge,ge,ce,he,u,cof1e,mode,mod1,adj,cof1,coadj,q;
+  GFS sf;
 
-	for ( nv = 0, tvl = vl; tvl; tvl = NEXT(tvl), nv++);
-	if ( nv == 1 ) {
-		ugcdsf(pa,m,r);
-		return;
-	}
-	/* find v s.t. min(deg(pa[i],v)+gethdeg(pa[i],v)) is minimal */
-	tvl = vl;
-	do {
-		v = tvl->v;
-		i = 0;
-		do {
-			d = getdeg(v,pa[i])+gethdeg(vl,v,pa[i]);
-			if ( i == 0 || (d < d0) ) {
-				d0 = d; i0 = i; v0 = v;
-			}
-		} while ( ++i < m );
-		if ( tvl == vl || (d0 < dmin) ) {
-			dmin = d0; imin = i0; vmin = v0;
-		}
-	} while ( tvl = NEXT(tvl) );
+  for ( nv = 0, tvl = vl; tvl; tvl = NEXT(tvl), nv++);
+  if ( nv == 1 ) {
+    ugcdsf(pa,m,r);
+    return;
+  }
+  /* find v s.t. min(deg(pa[i],v)+gethdeg(pa[i],v)) is minimal */
+  tvl = vl;
+  do {
+    v = tvl->v;
+    i = 0;
+    do {
+      d = getdeg(v,pa[i])+gethdeg(vl,v,pa[i]);
+      if ( i == 0 || (d < d0) ) {
+        d0 = d; i0 = i; v0 = v;
+      }
+    } while ( ++i < m );
+    if ( tvl == vl || (d0 < dmin) ) {
+      dmin = d0; imin = i0; vmin = v0;
+    }
+  } while ( tvl = NEXT(tvl) );
 
-	/* reorder variables so that vmin is the last variable */
-	for ( nvl0 = 0, rvl0 = 0, tvl = vl; tvl; tvl = NEXT(tvl) )
-		if ( tvl->v != vmin ) {
-			NEXTVL(nvl0,nvl); nvl->v = tvl->v;
-			NEXTVL(rvl0,rvl); rvl->v = tvl->v;
-		}
-	/* rvl = remaining variables */
-	NEXT(rvl) = 0; rvl = rvl0;
-	/* nvl = ...,vmin */
-	NEXTVL(nvl0,nvl); nvl->v = vmin; NEXT(nvl) = 0; nvl = nvl0;
-	MKV(vmin,x);
+  /* reorder variables so that vmin is the last variable */
+  for ( nvl0 = 0, rvl0 = 0, tvl = vl; tvl; tvl = NEXT(tvl) )
+    if ( tvl->v != vmin ) {
+      NEXTVL(nvl0,nvl); nvl->v = tvl->v;
+      NEXTVL(rvl0,rvl); rvl->v = tvl->v;
+    }
+  /* rvl = remaining variables */
+  NEXT(rvl) = 0; rvl = rvl0;
+  /* nvl = ...,vmin */
+  NEXTVL(nvl0,nvl); nvl->v = vmin; NEXT(nvl) = 0; nvl = nvl0;
+  MKV(vmin,x);
 
-	/* for content and primitive part */
-	pc = (P *)ALLOCA(m*sizeof(P));
-	ps = (P *)ALLOCA(m*sizeof(P));
-	ph = (P *)ALLOCA(m*sizeof(P));
-	/* separate the contents */
-	for ( i = 0; i < m; i++ ) {
-		reorderp(nvl,vl,pa[i],&t);
-		cont_pp_mv_sf(nvl,rvl,t,&pc[i],&ps[i]);
-		head_monomial(nvl,vmin,ps[i],&ph[i],&t);
-	}
-	ugcdsf(pc,m,&cont);
-	ugcdsf(ph,m,&hg);
+  /* for content and primitive part */
+  pc = (P *)ALLOCA(m*sizeof(P));
+  ps = (P *)ALLOCA(m*sizeof(P));
+  ph = (P *)ALLOCA(m*sizeof(P));
+  /* separate the contents */
+  for ( i = 0; i < m; i++ ) {
+    reorderp(nvl,vl,pa[i],&t);
+    cont_pp_mv_sf(nvl,rvl,t,&pc[i],&ps[i]);
+    head_monomial(nvl,vmin,ps[i],&ph[i],&t);
+  }
+  ugcdsf(pc,m,&cont);
+  ugcdsf(ph,m,&hg);
 
-	/* for hg*pp (used in check phase) */
-	lps = (P *)ALLOCA(m*sizeof(P));
-	for ( i = 0; i < m; i++ )
-		mulp(nvl,hg,ps[i],&lps[i]);
+  /* for hg*pp (used in check phase) */
+  lps = (P *)ALLOCA(m*sizeof(P));
+  for ( i = 0; i < m; i++ )
+    mulp(nvl,hg,ps[i],&lps[i]);
 
-	while ( 1 ) {
-		g = 0;
-		cof1 = 0;
-		hm = 0;
-		itogfs(1,&mod);
-		index = 0;
-		for ( index = 0; getdeg(vmin,mod) <= d+1; index++ ) {
-			/* evaluation pt */
-			indextogfs(index,&s);
-			substp(nvl,hg,vmin,s,&hge);
-			if ( !hge )
-				continue;
-			for ( i = 0; i < m; i++ )
-				substp(nvl,ps[i],vmin,s,&ph[i]);
-			/* ge = GCD(ps[0]|x=s,...,ps[m-1]|x=s) */
-			gcdsf(nvl,ph,m,&ge);
-			head_monomial(nvl,vmin,ge,&ce,&he);
-			if ( NUM(he) ) {
-				*r = cont;
-				return;
-			}
-			divgfs((GFS)hge,(GFS)ce,&sf); t = (P)sf;
-			mulp(nvl,t,ge,&u); ge = u;
-			divsp(nvl,ph[imin],ge,&t); mulp(nvl,hge,t,&cof1e);
-			/* hm=0 : reset; he==hm : lucky */
-			if ( !hm || !compp(nvl,he,hm) ) {
-				substp(nvl,mod,vmin,s,&mode); divsp(nvl,mod,mode,&mod1); 
-				/* adj = mod/(mod|x=s)*(ge-g|x=s) */
-				substp(nvl,g,vmin,s,&t);
-				subp(nvl,ge,t,&u); mulp(nvl,mod1,u,&adj);
-				/* coadj = mod/(mod|vmin=s)*(cof1e-cof1e|vmin=s) */
-				substp(nvl,cof1,vmin,s,&t);
-				subp(nvl,cof1e,t,&u); mulp(nvl,mod1,u,&coadj);
-				if ( !adj ) {
-					/* adj == gcd ? */
-					for ( i = 0; i < m; i++ )
-						if ( !divtp(nvl,lps[i],g,&t) )
-							break;
-					if ( i == m ) {
-						cont_pp_mv_sf(nvl,rvl,g,&t,&u);
-						mulp(nvl,cont,u,&t);
-						reorderp(vl,nvl,t,r);
-						return;
-					}
-				} else if ( !coadj ) {
-					/* ps[imin]/coadj == gcd ? */
-					if ( divtp(nvl,lps[imin],cof1,&q) ) {
-						for ( i = 0; i < m; i++ )
-							if ( !divtp(nvl,lps[i],q,&t) )
-								break;
-						if ( i == m ) {
-							cont_pp_mv_sf(nvl,rvl,q,&t,&u);
-							mulp(nvl,cont,u,&t);
-							reorderp(vl,nvl,t,r);
-							return;
-						}
-					}
-				}
-				addp(nvl,g,adj,&t); g = t;
-				addp(nvl,cof1,coadj,&t); cof1 = t;
-				subp(nvl,x,s,&t); mulp(nvl,mod,t,&u); mod = u;
-				hm = he;
-			} else {
-				d1 = homdeg(hm); d2 = homdeg(he);
-				if ( d1 < d2 ) /* we use current hm */
-					continue;
-				else if ( d1 > d2 ) {
-					/* use he */
-					g = ge;
-					cof1 = cof1e;
-					hm = he;
-					subp(nvl,x,s,&mod);
-				} else { 
-					/* d1==d2, but hm!=he => both are unlucky */
-					g = 0;
-					cof1 = 0;
-					itogfs(1,&mod);
-				}
-			}
-		}
-	}
+  while ( 1 ) {
+    g = 0;
+    cof1 = 0;
+    hm = 0;
+    itogfs(1,&mod);
+    index = 0;
+    for ( index = 0; getdeg(vmin,mod) <= d+1; index++ ) {
+      /* evaluation pt */
+      indextogfs(index,&s);
+      substp(nvl,hg,vmin,s,&hge);
+      if ( !hge )
+        continue;
+      for ( i = 0; i < m; i++ )
+        substp(nvl,ps[i],vmin,s,&ph[i]);
+      /* ge = GCD(ps[0]|x=s,...,ps[m-1]|x=s) */
+      gcdsf(nvl,ph,m,&ge);
+      head_monomial(nvl,vmin,ge,&ce,&he);
+      if ( NUM(he) ) {
+        *r = cont;
+        return;
+      }
+      divgfs((GFS)hge,(GFS)ce,&sf); t = (P)sf;
+      mulp(nvl,t,ge,&u); ge = u;
+      divsp(nvl,ph[imin],ge,&t); mulp(nvl,hge,t,&cof1e);
+      /* hm=0 : reset; he==hm : lucky */
+      if ( !hm || !compp(nvl,he,hm) ) {
+        substp(nvl,mod,vmin,s,&mode); divsp(nvl,mod,mode,&mod1); 
+        /* adj = mod/(mod|x=s)*(ge-g|x=s) */
+        substp(nvl,g,vmin,s,&t);
+        subp(nvl,ge,t,&u); mulp(nvl,mod1,u,&adj);
+        /* coadj = mod/(mod|vmin=s)*(cof1e-cof1e|vmin=s) */
+        substp(nvl,cof1,vmin,s,&t);
+        subp(nvl,cof1e,t,&u); mulp(nvl,mod1,u,&coadj);
+        if ( !adj ) {
+          /* adj == gcd ? */
+          for ( i = 0; i < m; i++ )
+            if ( !divtp(nvl,lps[i],g,&t) )
+              break;
+          if ( i == m ) {
+            cont_pp_mv_sf(nvl,rvl,g,&t,&u);
+            mulp(nvl,cont,u,&t);
+            reorderp(vl,nvl,t,r);
+            return;
+          }
+        } else if ( !coadj ) {
+          /* ps[imin]/coadj == gcd ? */
+          if ( divtp(nvl,lps[imin],cof1,&q) ) {
+            for ( i = 0; i < m; i++ )
+              if ( !divtp(nvl,lps[i],q,&t) )
+                break;
+            if ( i == m ) {
+              cont_pp_mv_sf(nvl,rvl,q,&t,&u);
+              mulp(nvl,cont,u,&t);
+              reorderp(vl,nvl,t,r);
+              return;
+            }
+          }
+        }
+        addp(nvl,g,adj,&t); g = t;
+        addp(nvl,cof1,coadj,&t); cof1 = t;
+        subp(nvl,x,s,&t); mulp(nvl,mod,t,&u); mod = u;
+        hm = he;
+      } else {
+        d1 = homdeg(hm); d2 = homdeg(he);
+        if ( d1 < d2 ) /* we use current hm */
+          continue;
+        else if ( d1 > d2 ) {
+          /* use he */
+          g = ge;
+          cof1 = cof1e;
+          hm = he;
+          subp(nvl,x,s,&mod);
+        } else { 
+          /* d1==d2, but hm!=he => both are unlucky */
+          g = 0;
+          cof1 = 0;
+          itogfs(1,&mod);
+        }
+      }
+    }
+  }
 }
 
 void head_monomial(VL vl,V v,P p,P *coef,P *term)
 {
-	P t,s,u;
-	DCP dc;
-	GFS one;
+  P t,s,u;
+  DCP dc;
+  GFS one;
 
-	itogfs(1,&one);
-	t = (P)one;
-	while ( 1 ) {
-		if ( NUM(p) || VR(p) == v ) {
-			*coef = p;
-			*term = t;
-			return;
-		} else {
-			NEWDC(dc); 
-			COEF(dc) = (P)one; DEG(dc) = DEG(DC(p));
-			MKP(VR(p),dc,s);
-			mulp(vl,t,s,&u); t = u;
-			p = COEF(DC(p));
-		}
-	}
+  itogfs(1,&one);
+  t = (P)one;
+  while ( 1 ) {
+    if ( NUM(p) || VR(p) == v ) {
+      *coef = p;
+      *term = t;
+      return;
+    } else {
+      NEWDC(dc); 
+      COEF(dc) = (P)one; DEG(dc) = DEG(DC(p));
+      MKP(VR(p),dc,s);
+      mulp(vl,t,s,&u); t = u;
+      p = COEF(DC(p));
+    }
+  }
 }
 
 void cont_pp_mv_sf(VL vl,VL rvl,P p,P *c,P *pp)
 {
-	DP dp;
-	MP t;
-	int i,m;
-	P *ps;
-	struct order_spec *spec, *currentspec;
-	extern struct order_spec *dp_current_spec;
+  DP dp;
+  MP t;
+  int i,m;
+  P *ps;
+  struct order_spec *spec, *currentspec;
+  extern struct order_spec *dp_current_spec;
 
-	currentspec = dp_current_spec;
-	create_order_spec(0,0,&spec);
-	initd(spec);
-	ptod(vl,rvl,p,&dp);
-	for ( t = BDY(dp), m = 0; t; t = NEXT(t), m++ );
-	ps = (P *)ALLOCA(m*sizeof(P));
-	for ( t = BDY(dp), i = 0; t; t = NEXT(t), i++ )
-		ps[i] = C(t);
-	gcdsf(vl,ps,m,c);
-	divsp(vl,p,*c,pp);
-	initd(currentspec);
+  currentspec = dp_current_spec;
+  create_order_spec(0,0,&spec);
+  initd(spec);
+  ptod(vl,rvl,p,&dp);
+  for ( t = BDY(dp), m = 0; t; t = NEXT(t), m++ );
+  ps = (P *)ALLOCA(m*sizeof(P));
+  for ( t = BDY(dp), i = 0; t; t = NEXT(t), i++ )
+    ps[i] = C(t);
+  gcdsf(vl,ps,m,c);
+  divsp(vl,p,*c,pp);
+  initd(currentspec);
 }
 
 void mfctrsf(VL vl, P f, DCP *dcp)
 {
-	DCP dc0,dc,dct,dcs,dcr;
-	Obj obj;
+  DCP dc0,dc,dct,dcs,dcr;
+  Obj obj;
 
-	simp_ff((Obj)f,&obj); f = (P)obj;
-	sqfrsf(vl,f,&dct);
-	dc = dc0 = dct; dct = NEXT(dct); NEXT(dc) = 0;
-	for ( ; dct; dct = NEXT(dct) ) {
-		mfctrsfmain(vl,COEF(dct),&dcs);
-		for ( dcr = dcs; dcr; dcr = NEXT(dcr) )
-			DEG(dcr) = DEG(dct);
-		for ( ; NEXT(dc); dc = NEXT(dc) );
-		NEXT(dc) = dcs;
-	}
-	*dcp = dc0;
+  simp_ff((Obj)f,&obj); f = (P)obj;
+  sqfrsf(vl,f,&dct);
+  dc = dc0 = dct; dct = NEXT(dct); NEXT(dc) = 0;
+  for ( ; dct; dct = NEXT(dct) ) {
+    mfctrsfmain(vl,COEF(dct),&dcs);
+    for ( dcr = dcs; dcr; dcr = NEXT(dcr) )
+      DEG(dcr) = DEG(dct);
+    for ( ; NEXT(dc); dc = NEXT(dc) );
+    NEXT(dc) = dcs;
+  }
+  *dcp = dc0;
 }
 
 /* f : sqfr, non const */
 
 void mfctrsfmain(VL vl, P f, DCP *dcp)
 {
-	VL tvl,nvl,rvl;
-	DCP dc,dc0,dc1,dc2,dct,lcfdc,dcs;
-	int imin,inext,i,j,n,k,np;
-	int *da;
-	V vx,vy;
-	V *va;
-	P *l,*tl;
-	P gcd,g,df,dfmin;
-	P pa[2];
-	P f0,pp0,spp0,c,c0,x,y,u,v,lcf,lcu,lcv,u0,v0,t,s;
-	P ype,yme,fin;
-	GFS ev,evy;
-	P *fp0;
-	int *mev,*win;
+  VL tvl,nvl,rvl;
+  DCP dc,dc0,dc1,dc2,dct,lcfdc,dcs;
+  int imin,inext,i,j,n,k,np;
+  int *da;
+  V vx,vy;
+  V *va;
+  P *l,*tl;
+  P gcd,g,df,dfmin;
+  P pa[2];
+  P f0,pp0,spp0,c,c0,x,y,u,v,lcf,lcu,lcv,u0,v0,t,s;
+  P ype,yme,fin;
+  GFS ev,evy;
+  P *fp0;
+  int *mev,*win;
 
-	clctv(vl,f,&tvl); vl = tvl;
-	if ( !vl )
-		error("mfctrsfmain : cannot happen");
-	if ( !NEXT(vl) ) {
-		/* univariate */
-		ufctrsf(f,&dc);
-		/* remove lc */
-		*dcp = NEXT(dc);
-		return;
-	}
-	for ( n = 0, tvl = vl; tvl; tvl = NEXT(tvl), n++ );
-	va = (V *)ALLOCA(n*sizeof(V));
-	da = (int *)ALLOCA(n*sizeof(int));
-	/* find v s.t. diff(f,v) is nonzero and deg(f,v) is minimal */
-	imin = -1;
-	for ( i = 0, tvl = vl; i < n; tvl = NEXT(tvl), i++ ) {
-		va[i] = tvl->v;	
-		da[i] = getdeg(va[i],f);
-		diffp(vl,f,va[i],&df);
-		if ( !df )
-			continue;
-		if ( imin < 0 || da[i] < da[imin] ) {
-			dfmin = df;
-			imin = i;
-		}
-	}
-	/* find v1 neq v s.t. deg(f,v) is minimal */
-	inext = -1;
-	for ( i = 0; i < n; i++ ) {
-		if ( i == imin )
-			continue;
-		if ( inext < 0 || da[i] < da[inext] )
-			inext = i;
-	}
-	pa[0] = f;
-	pa[1] = dfmin;
-	gcdsf(vl,pa,2,&gcd);
-	if ( !NUM(gcd) ) {
-		/* f = gcd * f/gcd */	
-		mfctrsfmain(vl,gcd,&dc1);
-		divsp(vl,f,gcd,&g);
-		mfctrsfmain(vl,g,&dc2);
-		for ( dct = dc1; NEXT(dct); dct = NEXT(dct) );
-		NEXT(dct) = dc2;
-		*dcp = dc1;
-		return;
-	}
-	/* create vl s.t. vl[0] = va[imin], vl[1] = va[inext] */
-	nvl = 0;
-	NEXTVL(nvl,tvl); tvl->v = va[imin];
-	NEXTVL(nvl,tvl); tvl->v = va[inext];
-	for ( i = 0; i < n; i++ ) {
-		if ( i == imin || i == inext )
-			continue;
-		NEXTVL(nvl,tvl); tvl->v = va[i];
-	}
-	NEXT(tvl) = 0;
+  clctv(vl,f,&tvl); vl = tvl;
+  if ( !vl )
+    error("mfctrsfmain : cannot happen");
+  if ( !NEXT(vl) ) {
+    /* univariate */
+    ufctrsf(f,&dc);
+    /* remove lc */
+    *dcp = NEXT(dc);
+    return;
+  }
+  for ( n = 0, tvl = vl; tvl; tvl = NEXT(tvl), n++ );
+  va = (V *)ALLOCA(n*sizeof(V));
+  da = (int *)ALLOCA(n*sizeof(int));
+  /* find v s.t. diff(f,v) is nonzero and deg(f,v) is minimal */
+  imin = -1;
+  for ( i = 0, tvl = vl; i < n; tvl = NEXT(tvl), i++ ) {
+    va[i] = tvl->v;  
+    da[i] = getdeg(va[i],f);
+    diffp(vl,f,va[i],&df);
+    if ( !df )
+      continue;
+    if ( imin < 0 || da[i] < da[imin] ) {
+      dfmin = df;
+      imin = i;
+    }
+  }
+  /* find v1 neq v s.t. deg(f,v) is minimal */
+  inext = -1;
+  for ( i = 0; i < n; i++ ) {
+    if ( i == imin )
+      continue;
+    if ( inext < 0 || da[i] < da[inext] )
+      inext = i;
+  }
+  pa[0] = f;
+  pa[1] = dfmin;
+  gcdsf(vl,pa,2,&gcd);
+  if ( !NUM(gcd) ) {
+    /* f = gcd * f/gcd */  
+    mfctrsfmain(vl,gcd,&dc1);
+    divsp(vl,f,gcd,&g);
+    mfctrsfmain(vl,g,&dc2);
+    for ( dct = dc1; NEXT(dct); dct = NEXT(dct) );
+    NEXT(dct) = dc2;
+    *dcp = dc1;
+    return;
+  }
+  /* create vl s.t. vl[0] = va[imin], vl[1] = va[inext] */
+  nvl = 0;
+  NEXTVL(nvl,tvl); tvl->v = va[imin];
+  NEXTVL(nvl,tvl); tvl->v = va[inext];
+  for ( i = 0; i < n; i++ ) {
+    if ( i == imin || i == inext )
+      continue;
+    NEXTVL(nvl,tvl); tvl->v = va[i];
+  }
+  NEXT(tvl) = 0;
 
-	fin = f;
-	reorderp(nvl,vl,f,&g); f = g;
-	vx = nvl->v;
-	vy = NEXT(nvl)->v;
-	MKV(vx,x);
-	MKV(vy,y);
-	/* remaining variables */
-	rvl = NEXT(NEXT(nvl));
-	if ( !rvl ) {
-		/* bivariate */
-		sfbfctr(f,vx,vy,getdeg(vx,f),&dc1);
-		for ( dc0 = 0; dc1; dc1 = NEXT(dc1) ) {
-			NEXTDC(dc0,dc);
-			DEG(dc) = ONE;
-			reorderp(vl,nvl,COEF(dc1),&COEF(dc));
-		}
-		NEXT(dc) = 0;
-		*dcp = dc0;
-		return;
-	}
-	/* n >= 3;  nvl = (vx,vy,X) */
-	/* find good evaluation pt for X */
-	mev = (int *)CALLOC(n-2,sizeof(int));
-	while ( 1 ) {
-		/* lcf(mev)=0 => invalid */
-		substvp_sf(nvl,rvl,COEF(DC(f)),mev,&t);
-		if ( t ) {
-			substvp_sf(nvl,rvl,f,mev,&f0);
-			pa[0] = f0;
-			diffp(nvl,f0,vx,&pa[1]);
-			if ( pa[1] ) {
-				gcdsf(nvl,pa,2,&gcd);
-			/* XXX maybe we have to accept the case where gcd is a poly of y */
-				if ( NUM(gcd) )
-					break;
-			}
-		}
-		/* XXX if generated indices exceed q of GF(q) => error in indextogfs */
-		next_evaluation_point(mev,n-2);
-	}
-	/* f0 = f(x,y,mev) */
-	/* separate content; f0 may have the content wrt x */
-	cont_pp_sfp(nvl,f0,&c0,&pp0);
+  fin = f;
+  reorderp(nvl,vl,f,&g); f = g;
+  vx = nvl->v;
+  vy = NEXT(nvl)->v;
+  MKV(vx,x);
+  MKV(vy,y);
+  /* remaining variables */
+  rvl = NEXT(NEXT(nvl));
+  if ( !rvl ) {
+    /* bivariate */
+    sfbfctr(f,vx,vy,getdeg(vx,f),&dc1);
+    for ( dc0 = 0; dc1; dc1 = NEXT(dc1) ) {
+      NEXTDC(dc0,dc);
+      DEG(dc) = ONE;
+      reorderp(vl,nvl,COEF(dc1),&COEF(dc));
+    }
+    NEXT(dc) = 0;
+    *dcp = dc0;
+    return;
+  }
+  /* n >= 3;  nvl = (vx,vy,X) */
+  /* find good evaluation pt for X */
+  mev = (int *)CALLOC(n-2,sizeof(int));
+  while ( 1 ) {
+    /* lcf(mev)=0 => invalid */
+    substvp_sf(nvl,rvl,COEF(DC(f)),mev,&t);
+    if ( t ) {
+      substvp_sf(nvl,rvl,f,mev,&f0);
+      pa[0] = f0;
+      diffp(nvl,f0,vx,&pa[1]);
+      if ( pa[1] ) {
+        gcdsf(nvl,pa,2,&gcd);
+      /* XXX maybe we have to accept the case where gcd is a poly of y */
+        if ( NUM(gcd) )
+          break;
+      }
+    }
+    /* XXX if generated indices exceed q of GF(q) => error in indextogfs */
+    next_evaluation_point(mev,n-2);
+  }
+  /* f0 = f(x,y,mev) */
+  /* separate content; f0 may have the content wrt x */
+  cont_pp_sfp(nvl,f0,&c0,&pp0);
 
-	/* factorize pp0; pp0 = pp0(x,y+evy) = prod dc */
-	sfbfctr_shift(pp0,vx,vy,getdeg(vx,pp0),&evy,&spp0,&dc); pp0 = spp0;
+  /* factorize pp0; pp0 = pp0(x,y+evy) = prod dc */
+  sfbfctr_shift(pp0,vx,vy,getdeg(vx,pp0),&evy,&spp0,&dc); pp0 = spp0;
 
-	if ( !NEXT(dc) ) {
-		/* f is irreducible */
-		NEWDC(dc); DEG(dc) = ONE; COEF(dc) = fin; NEXT(dc) = 0;
-		*dcp = dc;
-		return;
-	}
-	/* ype = y+evy, yme = y-evy */
-	addp(nvl,y,(P)evy,&ype); subp(nvl,y,(P)evy,&yme);
+  if ( !NEXT(dc) ) {
+    /* f is irreducible */
+    NEWDC(dc); DEG(dc) = ONE; COEF(dc) = fin; NEXT(dc) = 0;
+    *dcp = dc;
+    return;
+  }
+  /* ype = y+evy, yme = y-evy */
+  addp(nvl,y,(P)evy,&ype); subp(nvl,y,(P)evy,&yme);
 
-	/* shift c0; c0 <- c0(y+evy) */
-	substp(nvl,c0,vy,ype,&s); c0 = s;
+  /* shift c0; c0 <- c0(y+evy) */
+  substp(nvl,c0,vy,ype,&s); c0 = s;
 
-	/* shift f; f <- f(y+evy) */
-	substp(nvl,f,vy,ype,&s); f = s;
+  /* shift f; f <- f(y+evy) */
+  substp(nvl,f,vy,ype,&s); f = s;
 
-	/* now f(x,0,mev) = c0 * prod dc */
+  /* now f(x,0,mev) = c0 * prod dc */
 
-	/* factorize lc_x(f) */
-	lcf = COEF(DC(f));
-	mfctrsf(nvl,lcf,&dct); 
-	/* skip the first element (= a number) */
-	lcfdc = NEXT(dct);
+  /* factorize lc_x(f) */
+  lcf = COEF(DC(f));
+  mfctrsf(nvl,lcf,&dct); 
+  /* skip the first element (= a number) */
+  lcfdc = NEXT(dct);
 
-	/* np = number of bivariate factors */
-	for ( np = 0, dct = dc; dct; dct = NEXT(dct), np++ );
-	fp0 = (P *)ALLOCA((np+1)*sizeof(P));
-	for ( i = 0, dct = dc; i < np; dct = NEXT(dct), i++ )
-		fp0[i] = COEF(dct);
-	fp0[np] = 0;
-	l = tl = (P *)ALLOCA((np+1)*sizeof(P));
-	win = W_ALLOC(np+1);
+  /* np = number of bivariate factors */
+  for ( np = 0, dct = dc; dct; dct = NEXT(dct), np++ );
+  fp0 = (P *)ALLOCA((np+1)*sizeof(P));
+  for ( i = 0, dct = dc; i < np; dct = NEXT(dct), i++ )
+    fp0[i] = COEF(dct);
+  fp0[np] = 0;
+  l = tl = (P *)ALLOCA((np+1)*sizeof(P));
+  win = W_ALLOC(np+1);
 
-	for ( k = 1, win[0] = 1, --np; ; ) {
-		itogfs(1,&u0);
-		/* u0 = product of selected factors */
-		for ( i = 0; i < k; i++ ) {
-			mulp(nvl,u0,fp0[win[i]],&t); u0 = t;
-		}
-		/* we have to consider the content */
-		/* f0 = c0*u0*v0 */
-		mulp(nvl,LC(u0),c0,&c); estimatelc_sf(nvl,rvl,c,lcfdc,mev,&lcu);
-		divsp(nvl,pp0,u0,&v0);
-		mulp(nvl,LC(v0),c0,&c); estimatelc_sf(nvl,rvl,c,lcfdc,mev,&lcv);
-		mfctrsf_hensel(nvl,rvl,f,pp0,u0,v0,lcu,lcv,mev,&u);
-		if ( u ) {
-			/* save the factor */
-			reorderp(vl,nvl,u,&t);
-			/* y -> y-evy */
-			substp(vl,t,vy,yme,tl++);
+  for ( k = 1, win[0] = 1, --np; ; ) {
+    itogfs(1,&u0);
+    /* u0 = product of selected factors */
+    for ( i = 0; i < k; i++ ) {
+      mulp(nvl,u0,fp0[win[i]],&t); u0 = t;
+    }
+    /* we have to consider the content */
+    /* f0 = c0*u0*v0 */
+    mulp(nvl,LC(u0),c0,&c); estimatelc_sf(nvl,rvl,c,lcfdc,mev,&lcu);
+    divsp(nvl,pp0,u0,&v0);
+    mulp(nvl,LC(v0),c0,&c); estimatelc_sf(nvl,rvl,c,lcfdc,mev,&lcv);
+    mfctrsf_hensel(nvl,rvl,f,pp0,u0,v0,lcu,lcv,mev,&u);
+    if ( u ) {
+      /* save the factor */
+      reorderp(vl,nvl,u,&t);
+      /* y -> y-evy */
+      substp(vl,t,vy,yme,tl++);
 
-			/* update f,pp0 */
-			divsp(nvl,f,u,&t); f = t;
-			divsp(nvl,pp0,u0,&t); pp0 = t;
-			/* update win, fp0 */
-			for ( i = 0; i < k-1; i++ )
-			for ( j = win[i]+1; j < win[i+1]; j++ )
-				fp0[j-i-1] = fp0[j];
-			for ( j = win[k-1]+1; j <= np; j++ )
-					fp0[j-k] = fp0[j];
-			if ( ( np -= k ) < k ) break;
-			if ( np-win[0]+1 < k )
-				if ( ++k <= np ) {
-					for ( i = 0; i < k; i++ ) 
-						win[i] = i + 1;
-					continue;
-				} else
-					break;
-			else 
-				for ( i = 1; i < k; i++ ) 
-					win[i] = win[0] + i;
-		} else {
-			if ( ncombi(1,np,k,win) == 0 )
-				if ( k == np ) break;
-				else 
-					for ( i = 0, ++k; i < k; i++ ) 
-						win[i] = i + 1;
-		}
-	}
-	reorderp(vl,nvl,f,&t);
-	/* y -> y-evy */
-	substp(vl,t,vy,yme,tl++);
-	*tl = 0;
-	for ( dc0 = 0, i = 0; l[i]; i++ ) {
-		NEXTDC(dc0,dc); DEG(dc) = ONE; COEF(dc) = l[i];
-	}
-	NEXT(dc) = 0; *dcp = dc0;
+      /* update f,pp0 */
+      divsp(nvl,f,u,&t); f = t;
+      divsp(nvl,pp0,u0,&t); pp0 = t;
+      /* update win, fp0 */
+      for ( i = 0; i < k-1; i++ )
+      for ( j = win[i]+1; j < win[i+1]; j++ )
+        fp0[j-i-1] = fp0[j];
+      for ( j = win[k-1]+1; j <= np; j++ )
+          fp0[j-k] = fp0[j];
+      if ( ( np -= k ) < k ) break;
+      if ( np-win[0]+1 < k )
+        if ( ++k <= np ) {
+          for ( i = 0; i < k; i++ ) 
+            win[i] = i + 1;
+          continue;
+        } else
+          break;
+      else 
+        for ( i = 1; i < k; i++ ) 
+          win[i] = win[0] + i;
+    } else {
+      if ( ncombi(1,np,k,win) == 0 )
+        if ( k == np ) break;
+        else 
+          for ( i = 0, ++k; i < k; i++ ) 
+            win[i] = i + 1;
+    }
+  }
+  reorderp(vl,nvl,f,&t);
+  /* y -> y-evy */
+  substp(vl,t,vy,yme,tl++);
+  *tl = 0;
+  for ( dc0 = 0, i = 0; l[i]; i++ ) {
+    NEXTDC(dc0,dc); DEG(dc) = ONE; COEF(dc) = l[i];
+  }
+  NEXT(dc) = 0; *dcp = dc0;
 }
 
 void next_evaluation_point(int *e,int n)
 {
-	int i,t,j;
+  int i,t,j;
 
-	for ( i = n-1; i >= 0; i-- )
-		if ( e[i] ) break;
-	if ( i < 0 ) e[n-1] = 1;
-	else if ( i == 0 ) {
-		t = e[0]; e[0] = 0; e[n-1] = t+1;
-	} else {
-		e[i-1]++; t = e[i];
-		for ( j = i; j < n-1; j++ )
-			e[j] = 0;
-		e[n-1] = t-1;
-	}
+  for ( i = n-1; i >= 0; i-- )
+    if ( e[i] ) break;
+  if ( i < 0 ) e[n-1] = 1;
+  else if ( i == 0 ) {
+    t = e[0]; e[0] = 0; e[n-1] = t+1;
+  } else {
+    e[i-1]++; t = e[i];
+    for ( j = i; j < n-1; j++ )
+      e[j] = 0;
+    e[n-1] = t-1;
+  }
 }
 
 /* 
@@ -769,45 +769,45 @@ void next_evaluation_point(int *e,int n)
 
 void estimatelc_sf(VL vl,VL rvl,P c,DCP dc,int *mev,P *lcp)
 {
-	DCP dct;
-	P r,c1,c2,t,s,f;
-	int i,d;
-	Q q;
+  DCP dct;
+  P r,c1,c2,t,s,f;
+  int i,d;
+  Q q;
 
-	for ( dct = dc, r = (P)ONE; dct; dct = NEXT(dct) ) {
-		if ( NUM(COEF(dct)) )
-			continue;
-		/* constant part */
-		substvp_sf(vl,rvl,COEF(dct),mev,&f);
-		d = QTOS(DEG(dct));
-		for ( i = 0, c1 = c; i < d; i++ )
-			if ( !divtp(vl,c1,f,&c2) )
-				break;
-			else
-				c1 = c2;
-		if ( i ) {
-			STOQ(i,q);
-			pwrp(vl,COEF(dct),q,&s); mulp(vl,r,s,&t); r = t;
-		}
-	}
-	*lcp = r;
+  for ( dct = dc, r = (P)ONE; dct; dct = NEXT(dct) ) {
+    if ( NUM(COEF(dct)) )
+      continue;
+    /* constant part */
+    substvp_sf(vl,rvl,COEF(dct),mev,&f);
+    d = QTOS(DEG(dct));
+    for ( i = 0, c1 = c; i < d; i++ )
+      if ( !divtp(vl,c1,f,&c2) )
+        break;
+      else
+        c1 = c2;
+    if ( i ) {
+      STOQ(i,q);
+      pwrp(vl,COEF(dct),q,&s); mulp(vl,r,s,&t); r = t;
+    }
+  }
+  *lcp = r;
 }
 
 void substvp_sf(VL vl,VL rvl,P f,int *mev,P *r)
 {
-	int i;
-	VL tvl;
-	P g,t;
-	GFS ev;
+  int i;
+  VL tvl;
+  P g,t;
+  GFS ev;
 
-	for ( g = f, i = 0, tvl = rvl; tvl; tvl = NEXT(tvl), i++ ) {
-		if ( !mev )
-			ev = 0;
-		else
-			indextogfs(mev[i],&ev);
-		substp(vl,g,tvl->v,(P)ev,&t); g = t;
-	}
-	*r = g;
+  for ( g = f, i = 0, tvl = rvl; tvl; tvl = NEXT(tvl), i++ ) {
+    if ( !mev )
+      ev = 0;
+    else
+      indextogfs(mev[i],&ev);
+    substp(vl,g,tvl->v,(P)ev,&t); g = t;
+  }
+  *r = g;
 }
 
 /*
@@ -816,23 +816,23 @@ void substvp_sf(VL vl,VL rvl,P f,int *mev,P *r)
 
 void shift_sf(VL vl, VL rvl, P f, int *mev, int sgn, P *r)
 {
-	VL tvl;
-	int i;
-	P x,g,t,s;
-	GFS ev;
+  VL tvl;
+  int i;
+  P x,g,t,s;
+  GFS ev;
 
-	for ( g = f, tvl = rvl, i = 0; tvl; tvl = NEXT(tvl), i++ ) {
-		if ( !mev[i] )
-			continue;
-		indextogfs(mev[i],&ev);
-		MKV(tvl->v,x);
-		if ( sgn > 0 )
-			addp(vl,x,(P)ev,&t);
-		else
-			subp(vl,x,(P)ev,&t);
-		substp(vl,g,tvl->v,t,&s); g = s;
-	}
-	*r = g;
+  for ( g = f, tvl = rvl, i = 0; tvl; tvl = NEXT(tvl), i++ ) {
+    if ( !mev[i] )
+      continue;
+    indextogfs(mev[i],&ev);
+    MKV(tvl->v,x);
+    if ( sgn > 0 )
+      addp(vl,x,(P)ev,&t);
+    else
+      subp(vl,x,(P)ev,&t);
+    substp(vl,g,tvl->v,t,&s); g = s;
+  }
+  *r = g;
 }
 
 /*
@@ -841,325 +841,325 @@ void shift_sf(VL vl, VL rvl, P f, int *mev, int sgn, P
 
 void mfctrsf_hensel(VL vl,VL rvl,P f,P pp0,P u0,P v0,P lcu,P lcv,int *mev,P *up)
 {
-	VL tvl,onevl;
-	P t,s,w,u,v,ff,si,wu,wv,fj,cont;
-	UM ydy;
-	V vx,vy;
-	int dy,n,i,dbd,nv,j;
-	int *md;
-	P *uh,*vh;
-	P x,du0,dv0,m,q,r,fin;
-	P *cu,*cv;
-	GFSN inv;
+  VL tvl,onevl;
+  P t,s,w,u,v,ff,si,wu,wv,fj,cont;
+  UM ydy;
+  V vx,vy;
+  int dy,n,i,dbd,nv,j;
+  int *md;
+  P *uh,*vh;
+  P x,du0,dv0,m,q,r,fin;
+  P *cu,*cv;
+  GFSN inv;
 
-	/* check the validity of lc's and adjust coeffs */
-	/* f                -> lcu*lcv*x^(m+l)+... */
-	mulp(vl,lcu,lcv,&t); 
-	if ( !divtp(vl,t,LC(f),&m) ) {
-		*up = 0; return;
-	}
-	mulp(vl,m,f,&t); f = t;
-	/* u0 = am x^m+ ... -> lcu*x^m + a(m-1)*(lcu(mev)/am)*x^(m-1)+... */
-	/* v0 = bm x^l+ ... -> lcv*x^l + b(l-1)*(lcv(mev)/bl)*x^(l-1)+... */
-	adjust_coef_sf(vl,rvl,lcu,u0,mev,&u);
-	adjust_coef_sf(vl,rvl,lcv,v0,mev,&v);
+  /* check the validity of lc's and adjust coeffs */
+  /* f                -> lcu*lcv*x^(m+l)+... */
+  mulp(vl,lcu,lcv,&t); 
+  if ( !divtp(vl,t,LC(f),&m) ) {
+    *up = 0; return;
+  }
+  mulp(vl,m,f,&t); f = t;
+  /* u0 = am x^m+ ... -> lcu*x^m + a(m-1)*(lcu(mev)/am)*x^(m-1)+... */
+  /* v0 = bm x^l+ ... -> lcv*x^l + b(l-1)*(lcv(mev)/bl)*x^(l-1)+... */
+  adjust_coef_sf(vl,rvl,lcu,u0,mev,&u);
+  adjust_coef_sf(vl,rvl,lcv,v0,mev,&v);
 
-	/* f <- f(X+mev), u <- u(X+mev), v <- v(X+mev) */
-	fin = f;
-	shift_sf(vl,rvl,f,mev,1,&s); f = s;
-	shift_sf(vl,rvl,u,mev,1,&s); u = s;
-	shift_sf(vl,rvl,v,mev,1,&s); v = s;
+  /* f <- f(X+mev), u <- u(X+mev), v <- v(X+mev) */
+  fin = f;
+  shift_sf(vl,rvl,f,mev,1,&s); f = s;
+  shift_sf(vl,rvl,u,mev,1,&s); u = s;
+  shift_sf(vl,rvl,v,mev,1,&s); v = s;
 
-	vx = vl->v; vy = NEXT(vl)->v;
-	n = getdeg(vx,f);
-	dy = getdeg(vy,f)+1;
-	MKV(vx,x);
-	cu = (P *)ALLOCA((n+1)*sizeof(P));
-	cv = (P *)ALLOCA((n+1)*sizeof(P));
+  vx = vl->v; vy = NEXT(vl)->v;
+  n = getdeg(vx,f);
+  dy = getdeg(vy,f)+1;
+  MKV(vx,x);
+  cu = (P *)ALLOCA((n+1)*sizeof(P));
+  cv = (P *)ALLOCA((n+1)*sizeof(P));
 
-	/* ydy = y^dy */
-	ydy = C_UMALLOC(dy); DEG(ydy) = dy; COEF(ydy)[dy] = _onesf();
-	setmod_gfsn(ydy);
+  /* ydy = y^dy */
+  ydy = C_UMALLOC(dy); DEG(ydy) = dy; COEF(ydy)[dy] = _onesf();
+  setmod_gfsn(ydy);
 
-	/* (R[y]/(y^dy))[x,X] */
-	poly_to_gfsn_poly(vl,f,vy,&ff);
-	poly_to_gfsn_poly(vl,u,vy,&t); u = t;
-	poly_to_gfsn_poly(vl,v,vy,&t); v = t;
-	substvp_sf(vl,rvl,u,0,&u0);
-	substvp_sf(vl,rvl,v,0,&v0);
+  /* (R[y]/(y^dy))[x,X] */
+  poly_to_gfsn_poly(vl,f,vy,&ff);
+  poly_to_gfsn_poly(vl,u,vy,&t); u = t;
+  poly_to_gfsn_poly(vl,v,vy,&t); v = t;
+  substvp_sf(vl,rvl,u,0,&u0);
+  substvp_sf(vl,rvl,v,0,&v0);
 
-	/* compute a(x,y), b(x,y) s.t. a*u0+b*v0 = 1 mod y^dy */
-	extended_gcd_modyk(u0,v0,vx,vy,dy,&cu[0],&cv[0]);
+  /* compute a(x,y), b(x,y) s.t. a*u0+b*v0 = 1 mod y^dy */
+  extended_gcd_modyk(u0,v0,vx,vy,dy,&cu[0],&cv[0]);
 
-	/* dv0 = LC(v0)^(-1)*v0 mod y^dy */
-	invgfsn((GFSN)LC(v0),&inv); mulp(vl,v0,(P)inv,&dv0);
+  /* dv0 = LC(v0)^(-1)*v0 mod y^dy */
+  invgfsn((GFSN)LC(v0),&inv); mulp(vl,v0,(P)inv,&dv0);
 
-	/* cu[i]*u0+cv[i]*v0 = x^i mod y^dy */
-	/* (x*cu[i])*u0+(x*cv[i])*v0 = x^(i+1) */
-	/* x*cu[i] = q*dv0+r => cu[i+1] = r */
-	/* cv[i+1]*v0 = x*cv[i]*v0+q*u0*dv0 = (x*cv[i]+q*u0*inv)*v0 */
-	for ( i = 1; i <= n; i++ ) {
-		mulp(vl,x,cu[i-1],&m); divsrp(vl,m,dv0,&q,&cu[i]);
-		mulp(vl,x,cv[i-1],&m); mulp(vl,q,(P)inv,&t);
-		mulp(vl,t,u0,&s);
-		addp(vl,m,s,&cv[i]);
-	}
+  /* cu[i]*u0+cv[i]*v0 = x^i mod y^dy */
+  /* (x*cu[i])*u0+(x*cv[i])*v0 = x^(i+1) */
+  /* x*cu[i] = q*dv0+r => cu[i+1] = r */
+  /* cv[i+1]*v0 = x*cv[i]*v0+q*u0*dv0 = (x*cv[i]+q*u0*inv)*v0 */
+  for ( i = 1; i <= n; i++ ) {
+    mulp(vl,x,cu[i-1],&m); divsrp(vl,m,dv0,&q,&cu[i]);
+    mulp(vl,x,cv[i-1],&m); mulp(vl,q,(P)inv,&t);
+    mulp(vl,t,u0,&s);
+    addp(vl,m,s,&cv[i]);
+  }
 
 #if 0
-	/* XXX : check */
-	for ( i = 0; i <= n; i++ ) {
-		mulp(vl,cu[i],u0,&m); mulp(vl,cv[i],v0,&s);
-		addp(vl,m,s,&w);
-		printexpr(vl,w);
-		fprintf(asir_out,"\n");
-	}
+  /* XXX : check */
+  for ( i = 0; i <= n; i++ ) {
+    mulp(vl,cu[i],u0,&m); mulp(vl,cv[i],v0,&s);
+    addp(vl,m,s,&w);
+    printexpr(vl,w);
+    fprintf(asir_out,"\n");
+  }
 #endif
 
-	dbd = dbound(vx,f)+1;	
+  dbd = dbound(vx,f)+1;  
 
-	/* extract homogeneous parts */
-	W_CALLOC(dbd,P,uh); W_CALLOC(dbd,P,vh);
-	for ( i = 0; i <= dbd; i++ ) {
-		exthpc(vl,vx,u,i,&uh[i]); exthpc(vl,vx,v,i,&vh[i]);
-	}
+  /* extract homogeneous parts */
+  W_CALLOC(dbd,P,uh); W_CALLOC(dbd,P,vh);
+  for ( i = 0; i <= dbd; i++ ) {
+    exthpc(vl,vx,u,i,&uh[i]); exthpc(vl,vx,v,i,&vh[i]);
+  }
 
-	/* register degrees in each variables */
-	for ( nv = 0, tvl = rvl; tvl; tvl = NEXT(tvl), nv++ );
-	md = (int *)ALLOCA(nv*sizeof(int));
-	for ( i = 0, tvl = rvl; i < nv; tvl = NEXT(tvl), i++ )
-		md[i] = getdeg(tvl->v,f);
+  /* register degrees in each variables */
+  for ( nv = 0, tvl = rvl; tvl; tvl = NEXT(tvl), nv++ );
+  md = (int *)ALLOCA(nv*sizeof(int));
+  for ( i = 0, tvl = rvl; i < nv; tvl = NEXT(tvl), i++ )
+    md[i] = getdeg(tvl->v,f);
 
-	/* XXX for removing content of factor wrt vx */
-	NEWVL(onevl); onevl->v = vx; NEXT(onevl) = 0;
+  /* XXX for removing content of factor wrt vx */
+  NEWVL(onevl); onevl->v = vx; NEXT(onevl) = 0;
 
-	for ( j = 1; j <= dbd; j++ ) {
-		for ( i = 0, tvl = rvl; i < nv; tvl = NEXT(tvl), i++ )
-			if ( getdeg(tvl->v,u)+getdeg(tvl->v,v) > md[i] ) {
-				*up = 0;
-				return;
-			}
-		for ( i = 0, t = 0; i <= j; i++ ) {
-			mulp(vl,uh[i],vh[j-i],&s); addp(vl,s,t,&w); t = w;
-		}
+  for ( j = 1; j <= dbd; j++ ) {
+    for ( i = 0, tvl = rvl; i < nv; tvl = NEXT(tvl), i++ )
+      if ( getdeg(tvl->v,u)+getdeg(tvl->v,v) > md[i] ) {
+        *up = 0;
+        return;
+      }
+    for ( i = 0, t = 0; i <= j; i++ ) {
+      mulp(vl,uh[i],vh[j-i],&s); addp(vl,s,t,&w); t = w;
+    }
 
-		/* s = degree j part of (f-uv) */
-		exthpc(vl,vx,ff,j,&fj); subp(vl,fj,t,&s);
-		for ( i = 0, wu = 0, wv = 0; i <= n; i++ ) {
-			if ( !s )
-				si = 0;
-			else if ( VR(s) == vx )
-				coefp(s,i,&si);
-			else if ( i == 0 )
-				si = s;
-			else
-				si = 0;
-			if ( si ) {
-				mulp(vl,si,cv[i],&m); addp(vl,wu,m,&t); wu = t;
-				mulp(vl,si,cu[i],&m); addp(vl,wv,m,&t); wv = t;
-			}
-		}
-		if ( !wu ) {
-			gfsn_poly_to_poly(vl,u,vy,&t);
-			shift_sf(vl,rvl,t,mev,-1,&s);
-			if ( divtp(vl,fin,s,&q) ) {
-				cont_pp_mv_sf(vl,onevl,s,&cont,up);
-				return;
-			}
-		}
-		if ( !wv ) {
-			gfsn_poly_to_poly(vl,v,vy,&t);
-			shift_sf(vl,rvl,t,mev,-1,&s);
-			if ( divtp(vl,fin,s,&q) ) {
-				cont_pp_mv_sf(vl,onevl,q,&cont,up);
-				return;
-			}
-		}
-		addp(vl,u,wu,&t); u = t;
-		addp(vl,uh[j],wu,&t); uh[j] = t;
-		addp(vl,v,wv,&t); v = t;
-		addp(vl,vh[j],wv,&t); vh[j] = t;
-	}
-	gfsn_poly_to_poly(vl,u,vy,&t);
-	shift_sf(vl,rvl,t,mev,-1,&s);
-	if ( divtp(vl,fin,s,&q) )
-		cont_pp_mv_sf(vl,onevl,s,&cont,up);
-	else
-		*up = 0;
+    /* s = degree j part of (f-uv) */
+    exthpc(vl,vx,ff,j,&fj); subp(vl,fj,t,&s);
+    for ( i = 0, wu = 0, wv = 0; i <= n; i++ ) {
+      if ( !s )
+        si = 0;
+      else if ( VR(s) == vx )
+        coefp(s,i,&si);
+      else if ( i == 0 )
+        si = s;
+      else
+        si = 0;
+      if ( si ) {
+        mulp(vl,si,cv[i],&m); addp(vl,wu,m,&t); wu = t;
+        mulp(vl,si,cu[i],&m); addp(vl,wv,m,&t); wv = t;
+      }
+    }
+    if ( !wu ) {
+      gfsn_poly_to_poly(vl,u,vy,&t);
+      shift_sf(vl,rvl,t,mev,-1,&s);
+      if ( divtp(vl,fin,s,&q) ) {
+        cont_pp_mv_sf(vl,onevl,s,&cont,up);
+        return;
+      }
+    }
+    if ( !wv ) {
+      gfsn_poly_to_poly(vl,v,vy,&t);
+      shift_sf(vl,rvl,t,mev,-1,&s);
+      if ( divtp(vl,fin,s,&q) ) {
+        cont_pp_mv_sf(vl,onevl,q,&cont,up);
+        return;
+      }
+    }
+    addp(vl,u,wu,&t); u = t;
+    addp(vl,uh[j],wu,&t); uh[j] = t;
+    addp(vl,v,wv,&t); v = t;
+    addp(vl,vh[j],wv,&t); vh[j] = t;
+  }
+  gfsn_poly_to_poly(vl,u,vy,&t);
+  shift_sf(vl,rvl,t,mev,-1,&s);
+  if ( divtp(vl,fin,s,&q) )
+    cont_pp_mv_sf(vl,onevl,s,&cont,up);
+  else
+    *up = 0;
 }
 
 void adjust_coef_sf(VL vl,VL rvl,P lcu,P u0,int *mev,P *r)
 {
-	P lcu0,cu;
-	DCP dc0,dcu,dc;
+  P lcu0,cu;
+  DCP dc0,dcu,dc;
 
-	substvp_sf(vl,rvl,lcu,mev,&lcu0);
-	divsp(vl,lcu0,LC(u0),&cu);
-	for ( dc0 = 0, dcu = DC(u0); dcu; dcu = NEXT(dcu) ) {
-		if ( !dc0 ) {
-			NEXTDC(dc0,dc);
-			COEF(dc) = lcu;
-		} else {
-			NEXTDC(dc0,dc);
-			mulp(vl,cu,COEF(dcu),&COEF(dc));
-		}
-		DEG(dc) = DEG(dcu);
-	}
-	NEXT(dc) = 0;
-	MKP(VR(u0),dc0,*r);
+  substvp_sf(vl,rvl,lcu,mev,&lcu0);
+  divsp(vl,lcu0,LC(u0),&cu);
+  for ( dc0 = 0, dcu = DC(u0); dcu; dcu = NEXT(dcu) ) {
+    if ( !dc0 ) {
+      NEXTDC(dc0,dc);
+      COEF(dc) = lcu;
+    } else {
+      NEXTDC(dc0,dc);
+      mulp(vl,cu,COEF(dcu),&COEF(dc));
+    }
+    DEG(dc) = DEG(dcu);
+  }
+  NEXT(dc) = 0;
+  MKP(VR(u0),dc0,*r);
 }
 
 void extended_gcd_modyk(P u0,P v0,V x,V y,int dy,P *cu,P *cv)
 {
-	BM g,h,a,b;
+  BM g,h,a,b;
 
-	gfsn_univariate_to_sfbm(u0,dy,&g);	
-	gfsn_univariate_to_sfbm(v0,dy,&h);	
-	sfexgcd_by_hensel(g,h,dy,&a,&b);
-	sfbm_to_gfsn_univariate(a,x,y,cu);
-	sfbm_to_gfsn_univariate(b,x,y,cv);
+  gfsn_univariate_to_sfbm(u0,dy,&g);  
+  gfsn_univariate_to_sfbm(v0,dy,&h);  
+  sfexgcd_by_hensel(g,h,dy,&a,&b);
+  sfbm_to_gfsn_univariate(a,x,y,cu);
+  sfbm_to_gfsn_univariate(b,x,y,cv);
 }
 
 /* (F[y])[x] -> F[x][y] */
 
 void gfsn_univariate_to_sfbm(P f,int dy,BM *r)
 {
-	int dx,d,i;
-	BM b;
-	UM cy;
-	DCP dc;
+  int dx,d,i;
+  BM b;
+  UM cy;
+  DCP dc;
 
-	dx = getdeg(VR(f),f);	
-	b = BMALLOC(dx,dy);
-	DEG(b) = dy;
-	for ( dc = DC(f); dc; dc = NEXT(dc) ) {
-		/* d : degree in x, cy : poly in y */
-		d = QTOS(DEG(dc));
-		cy = BDY((GFSN)COEF(dc));
-		for ( i = DEG(cy); i >= 0; i-- )
-			COEF(COEF(b)[i])[d] = COEF(cy)[i];
-	}
-	for ( i = 0; i <= dy; i++ )
-		degum(COEF(b)[i],dx);
-	*r = b;
+  dx = getdeg(VR(f),f);  
+  b = BMALLOC(dx,dy);
+  DEG(b) = dy;
+  for ( dc = DC(f); dc; dc = NEXT(dc) ) {
+    /* d : degree in x, cy : poly in y */
+    d = QTOS(DEG(dc));
+    cy = BDY((GFSN)COEF(dc));
+    for ( i = DEG(cy); i >= 0; i-- )
+      COEF(COEF(b)[i])[d] = COEF(cy)[i];
+  }
+  for ( i = 0; i <= dy; i++ )
+    degum(COEF(b)[i],dx);
+  *r = b;
 }
 
 void sfbm_to_gfsn_univariate(BM f,V x,V y,P *r)
 {
-	P g;
-	VL vl;
+  P g;
+  VL vl;
 
-	sfbmtop(f,x,y,&g);
-	NEWVL(vl); vl->v = x;
-	NEWVL(NEXT(vl)); NEXT(vl)->v = y;
-	NEXT(NEXT(vl)) = 0;
-	poly_to_gfsn_poly(vl,g,y,r);
+  sfbmtop(f,x,y,&g);
+  NEWVL(vl); vl->v = x;
+  NEWVL(NEXT(vl)); NEXT(vl)->v = y;
+  NEXT(NEXT(vl)) = 0;
+  poly_to_gfsn_poly(vl,g,y,r);
 }
 
 void poly_to_gfsn_poly(VL vl,P f,V v,P *r)
 {
-	VL tvl,nvl0,nvl;
-	P g;
+  VL tvl,nvl0,nvl;
+  P g;
 
-	/* (x,y,...,v,...) -> (x,y,...,v) */
-	for ( nvl0 = 0, tvl = vl; tvl; tvl = NEXT(tvl) ) {
-		if ( tvl->v != v ) {
-			NEXTVL(nvl0,nvl);
-			nvl->v = tvl->v;
-		}
-	}
-	NEXTVL(nvl0,nvl);
-	nvl->v = v;
-	NEXT(nvl) = 0;
-	reorderp(nvl0,vl,f,&g);
-	poly_to_gfsn_poly_main(g,v,r);
+  /* (x,y,...,v,...) -> (x,y,...,v) */
+  for ( nvl0 = 0, tvl = vl; tvl; tvl = NEXT(tvl) ) {
+    if ( tvl->v != v ) {
+      NEXTVL(nvl0,nvl);
+      nvl->v = tvl->v;
+    }
+  }
+  NEXTVL(nvl0,nvl);
+  nvl->v = v;
+  NEXT(nvl) = 0;
+  reorderp(nvl0,vl,f,&g);
+  poly_to_gfsn_poly_main(g,v,r);
 }
 
 void poly_to_gfsn_poly_main(P f,V v,P *r)
 {
-	int d;
-	UM u;
-	GFSN g;
-	DCP dc,dct,dc0;
+  int d;
+  UM u;
+  GFSN g;
+  DCP dc,dct,dc0;
 
-	if ( !f )
-		*r = f;
-	else if ( NUM(f) || VR(f) == v ) {
-		d = getdeg(v,f);
-		u = UMALLOC(d);
-		ptosfum(f,u);		
-		MKGFSN(u,g);
-		*r = (P)g;
-	} else {
-		for ( dc0 = 0, dct = DC(f); dct; dct = NEXT(dct) ) {
-			NEXTDC(dc0,dc);
-			DEG(dc) = DEG(dct);
-			poly_to_gfsn_poly_main(COEF(dct),v,&COEF(dc));
-		}
-		NEXT(dc) = 0;
-		MKP(VR(f),dc0,*r);
-	}
+  if ( !f )
+    *r = f;
+  else if ( NUM(f) || VR(f) == v ) {
+    d = getdeg(v,f);
+    u = UMALLOC(d);
+    ptosfum(f,u);    
+    MKGFSN(u,g);
+    *r = (P)g;
+  } else {
+    for ( dc0 = 0, dct = DC(f); dct; dct = NEXT(dct) ) {
+      NEXTDC(dc0,dc);
+      DEG(dc) = DEG(dct);
+      poly_to_gfsn_poly_main(COEF(dct),v,&COEF(dc));
+    }
+    NEXT(dc) = 0;
+    MKP(VR(f),dc0,*r);
+  }
 }
 
 void gfsn_poly_to_poly(VL vl,P f,V v,P *r)
 {
-	VL tvl,nvl0,nvl;
-	P g;
+  VL tvl,nvl0,nvl;
+  P g;
 
-	gfsn_poly_to_poly_main(f,v,&g);
-	/* (x,y,...,v,...) -> (x,y,...,v) */
-	for ( nvl0 = 0, tvl = vl; tvl; tvl = NEXT(tvl) ) {
-		if ( tvl->v != v ) {
-			NEXTVL(nvl0,nvl);
-			nvl->v = tvl->v;
-		}
-	}
-	NEXTVL(nvl0,nvl);
-	nvl->v = v;
-	NEXT(nvl) = 0;
-	reorderp(vl,nvl0,g,r);
+  gfsn_poly_to_poly_main(f,v,&g);
+  /* (x,y,...,v,...) -> (x,y,...,v) */
+  for ( nvl0 = 0, tvl = vl; tvl; tvl = NEXT(tvl) ) {
+    if ( tvl->v != v ) {
+      NEXTVL(nvl0,nvl);
+      nvl->v = tvl->v;
+    }
+  }
+  NEXTVL(nvl0,nvl);
+  nvl->v = v;
+  NEXT(nvl) = 0;
+  reorderp(vl,nvl0,g,r);
 }
 
 void gfsn_poly_to_poly_main(P f,V v,P *r)
 {
-	DCP dc,dc0,dct;
+  DCP dc,dc0,dct;
 
-	if ( !f )
-		*r = f;
-	else if ( NUM(f) ) {
-		if ( NID((Num)f) == N_GFSN )
-			sfumtop(v,BDY((GFSN)f),r);
-		else
-			*r = f;
-	} else {
-		for ( dc0 = 0, dct = DC(f); dct; dct = NEXT(dct) ) {
-			NEXTDC(dc0,dc);
-			DEG(dc) = DEG(dct);
-			gfsn_poly_to_poly_main(COEF(dct),v,&COEF(dc));
-		}
-		NEXT(dc) = 0;
-		MKP(VR(f),dc0,*r);
-	}
+  if ( !f )
+    *r = f;
+  else if ( NUM(f) ) {
+    if ( NID((Num)f) == N_GFSN )
+      sfumtop(v,BDY((GFSN)f),r);
+    else
+      *r = f;
+  } else {
+    for ( dc0 = 0, dct = DC(f); dct; dct = NEXT(dct) ) {
+      NEXTDC(dc0,dc);
+      DEG(dc) = DEG(dct);
+      gfsn_poly_to_poly_main(COEF(dct),v,&COEF(dc));
+    }
+    NEXT(dc) = 0;
+    MKP(VR(f),dc0,*r);
+  }
 }
 
 void printsfum(UM f)
 {
-	int i;
+  int i;
 
-	for ( i = DEG(f); i >= 0; i-- ) {
-		printf("+(");
-		printf("%d",IFTOF(COEF(f)[i])); 
-		printf(")*y^%d",i);
-	}
+  for ( i = DEG(f); i >= 0; i-- ) {
+    printf("+(");
+    printf("%d",IFTOF(COEF(f)[i])); 
+    printf(")*y^%d",i);
+  }
 }
 
 void printsfbm(BM f)
 {
-	int i;
+  int i;
 
-	for ( i = DEG(f); i >= 0; i-- ) {
-		printf("+(");
-		printsfum(COEF(f)[i]); 
-		printf(")*y^%d",i);
-	}
+  for ( i = DEG(f); i >= 0; i-- ) {
+    printf("+(");
+    printsfum(COEF(f)[i]); 
+    printf(")*y^%d",i);
+  }
 }