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Added function prototypes.

/*
 * 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.
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 * 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
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 * (4) In the event that you modify the SOFTWARE, you shall notify FLL by
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 * 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'
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 * $OpenXM: OpenXM_contrib2/asir2000/engine/lmi.c,v 1.7 2020/10/04 03:14:08 noro Exp $ 
*/
#include "ca.h"
#include "base.h"
#include "inline.h"

typedef struct oGEN_LM {
  int id;
  N dense;
  N sparse;
  int bit;
  unsigned int lower;
} *GEN_LM;

void pwrlm0(N,N,N *);
void gen_simpn(N,N*);
void gen_simpn_force(N,N*);
void setmod_lf(N p);

int lm_lazy;

static GEN_LM current_mod_lm;

void random_lm(LM *r)
{
  N n,t;

  if ( !current_mod_lm )
    error("random_lm : current_mod_lm is not set");
  randomn(current_mod_lm->bit+1,&n);
  gen_simpn_force(n,&t);
  MKLM(t,*r);
}

void ntosparsen(N p,N *bits)
{
  int l,i,j,nz;
  N r;
  unsigned int *pb,*rb;
  if ( !p )
    *bits = 0;
  else {
    l = n_bits(p);
    pb = BD(p);
    for ( i = l-1, nz = 0; i >= 0; i-- )
      if ( pb[i>>5]&(1<<i&31) ) nz++;
    *bits = r = NALLOC(nz); PL(r) = nz;
    rb = BD(r);
    for ( i = l-1, j = 0; i >= 0; i-- )
      if ( pb[i>>5]&(1<<i&31) ) 
        rb[j++] = i;
  }
}

void setmod_lm(N p)
{
  int i;
    Q q;

  if ( !current_mod_lm )
    current_mod_lm = (GEN_LM)MALLOC(sizeof(struct oGEN_LM));
  bzero((char *)current_mod_lm,sizeof(struct oGEN_LM));
  current_mod_lm->dense = p;
  ntosparsen(p,&current_mod_lm->sparse);
  current_mod_lm->bit = n_bits(p);
  current_mod_lm->id = UP2_DENSE; /* use ordinary rep. by default */
  if ( !(current_mod_lm->bit%32) ) {
    for ( i = PL(p)-1; i >= 1; i-- )
      if ( BD(p)[i] != 0xffffffff )
        break;
    if ( !i ) {
      current_mod_lm->lower = (unsigned int)((((UL)1)<<32)-((UL)BD(p)[0]));
      current_mod_lm->id = UP2_SPARSE; /* XXX */
    }
  }
    setmod_lf(p);
}

void getmod_lm(N *p)
{
  if ( !current_mod_lm )
    *p = 0;
  else
    *p = current_mod_lm->dense;
}

void simplm(LM n,LM *r)
{
  N rem;

  if ( !n )
    *r = 0;
  else if ( NID(n) != N_LM )
    *r = n;
  else {
    gen_simpn(n->body,&rem);
    MKLM(rem,*r);
  }
}

void simplm_force(LM n,LM *r)
{
  N rem;

  if ( !n )
    *r = 0;
  else if ( NID(n) != N_LM )
    *r = n;
  else {
    gen_simpn_force(n->body,&rem);
    MKLM(rem,*r);
  }
}


void qtolm(Q q,LM *l)
{
  N rn;
  LM a,b,c;

  if ( !q || (OID(q)==O_N && ((NID(q) == N_LM) || (NID(q) == N_GFPN))) ) { /* XXX */
    *l = (LM)q;
  } else if ( OID(q) == O_N && NID(q) == N_Q ) {
    gen_simpn(NM(q),&rn); MKLM(rn,a);
    if ( SGN(q) < 0 ) {
      chsgnlm(a,&c); a = c;
    }
    if ( DN(q) ) {
      gen_simpn_force(DN(q),&rn); MKLM(rn,b);
      if ( !b )
        error("qtolm : invalid denominator");
      divlm(a,b,l);
    } else
      *l = a;
  } else
    error("qtolm : invalid argument");
}

#define NZLM(a) ((a)&&(NID(a)==N_LM))

void addlm(LM a,LM b,LM *c)
{
  N t,t1;
  LM z;

  qtolm((Q)a,&z); a = z; qtolm((Q)b,&z); b = z;
  if ( !a )
    *c = b;
  else if ( !b )
    *c = a;
  else {
    addn(a->body,b->body,&t);
    gen_simpn(t,&t1);
    MKLM(t1,*c);
  }
}

void sublm(LM a,LM b,LM *c)
{
  int s;
  N t;
  LM z;

  qtolm((Q)a,&z); a = z; qtolm((Q)b,&z); b = z;
  if ( !b )
    *c = a;
  else if ( !a )
    chsgnlm(b,c);
  else {
    s = subn(a->body,b->body,&t);
    if ( !s )
      *c = 0;
    else {
      MKLM(t,z);
      if ( s < 0 )
        chsgnlm(z,c);
      else
        *c = z;  
    }
  }
}

void mullm(LM a,LM b,LM *c)
{
  N t,r;
  LM z;

  qtolm((Q)a,&z); a = z; qtolm((Q)b,&z); b = z;
  if ( !a || !b )
    *c = 0;
  else {
    kmuln(a->body,b->body,&t);
    gen_simpn(t,&r);
    MKLM(r,*c);  
  }
}

void divlm(LM a,LM b,LM *c)
{
  LM r;
  Q t,m,i;
  LM z;

  qtolm((Q)a,&z); a = z; qtolm((Q)b,&z); b = z;
  if ( !b )
    error("divlm: division by 0");
  else if ( !a )
    *c = 0;
  else {
    NTOQ(b->body,1,t); NTOQ(current_mod_lm->dense,1,m);
    invl(t,m,&i);
    MKLM(NM(i),r);
    mullm(a,r,c);
  }
}

void chsgnlm(LM a,LM *c)
{
  LM t;
  N s,u;

  if ( !a )
    *c = a;
  else {
    qtolm((Q)a,&t); a = t;
    gen_simpn_force(a->body,&s);
    subn(current_mod_lm->dense,s,&u);
    MKLM(u,*c);
  }
}

void pwrlm(LM a,Q b,LM *c)
{
  LM t;
  N s;

  if ( !b ) {
    MKLM(ONEN,*c);
  } else if ( !a )
    *c = 0;
  else {
    qtolm((Q)a,&t); a = t;
    pwrlm0(a->body,NM(b),&s);
    MKLM(s,*c);
  }
}

void pwrlm0(N a,N n,N *c)
{
  N n1,t,t1,t2,r1;
  int r;

  if ( !n )
    *c = ONEN;
  else if ( UNIN(n) )
    *c = a;
  else {
    r = divin(n,2,&n1);
    pwrlm0(a,n1,&t);
    kmuln(t,t,&t1); gen_simpn(t1,&r1);
    if ( r ) {
      kmuln(r1,a,&t2); gen_simpn(t2,&r1);
    }
    *c = r1;
  }
}

int cmplm(LM a,LM b)
{
  LM z;

  qtolm((Q)a,&z); a = z; qtolm((Q)b,&z); b = z;
  if ( !a )
    if ( !b )
      return 0;
    else
      return -1;
  else if ( !b )
      return 1;
  else
    return cmpn(a->body,b->body);
}

void remn_special(N,N,int,unsigned int ,N *);

void gen_simpn(N a,N *b)
{
  if ( !current_mod_lm )
    error("gen_simpn: current_mod_lm is not set");
  if ( lm_lazy )
    *b = a;
  else if ( current_mod_lm->id == UP2_SPARSE )
    remn_special(a,current_mod_lm->dense,current_mod_lm->bit,current_mod_lm->lower,b);  
  else
    remn(a,current_mod_lm->dense,b);  
}

void gen_simpn_force(N a,N *b)
{
  if ( !current_mod_lm )
    error("gen_simpn_force: current_mod_lm is not set");
  else if ( current_mod_lm->id == UP2_SPARSE )
    remn_special(a,current_mod_lm->dense,current_mod_lm->bit,current_mod_lm->lower,b);  
  else
    remn(a,current_mod_lm->dense,b);  
}