* Makefile.am (DEFS): Added. automake adds -I options to DEFS,

[bpt/guile.git] / libguile / numbers.c

/* Copyright (C) 1995,1996,1997,1998,1999,2000 Free Software Foundation, Inc.
 *
 * This program 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, or (at your option)
 * any later version.
 * 
 * This program 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 this software; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307 USA
 *
 * As a special exception, the Free Software Foundation gives permission
 * for additional uses of the text contained in its release of GUILE.
 *
 * The exception is that, if you link the GUILE library with other files
 * to produce an executable, this does not by itself cause the
 * resulting executable to be covered by the GNU General Public License.
 * Your use of that executable is in no way restricted on account of
 * linking the GUILE library code into it.
 *
 * This exception does not however invalidate any other reasons why
 * the executable file might be covered by the GNU General Public License.
 *
 * This exception applies only to the code released by the
 * Free Software Foundation under the name GUILE.  If you copy
 * code from other Free Software Foundation releases into a copy of
 * GUILE, as the General Public License permits, the exception does
 * not apply to the code that you add in this way.  To avoid misleading
 * anyone as to the status of such modified files, you must delete
 * this exception notice from them.
 *
 * If you write modifications of your own for GUILE, it is your choice
 * whether to permit this exception to apply to your modifications.
 * If you do not wish that, delete this exception notice.  */

/* Software engineering face-lift by Greg J. Badros, 11-Dec-1999,
   gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */

\f

#include <stdio.h>
#include <math.h>
#include "libguile/_scm.h"
#include "libguile/unif.h"
#include "libguile/feature.h"
#include "libguile/ports.h"
#include "libguile/root.h"
#include "libguile/smob.h"
#include "libguile/strings.h"
#include "libguile/vectors.h"

#include "libguile/validate.h"
#include "libguile/numbers.h"
\f
#define DIGITS '0':case '1':case '2':case '3':case '4':\
 case '5':case '6':case '7':case '8':case '9'


/* IS_INF tests its floating point number for infiniteness
 */
#ifndef IS_INF
#define IS_INF(x) ((x) == (x) / 2)
#endif

/* Return true if X is not infinite and is not a NaN
 */
#ifndef isfinite
#define isfinite(x) (!IS_INF (x) && (x) == (x))
#endif

\f


SCM_DEFINE (scm_exact_p, "exact?", 1, 0, 0, 
            (SCM x),
	    "Return #t if X is an exact number, #f otherwise.")
#define FUNC_NAME s_scm_exact_p
{
  if (SCM_INUMP (x)) {
    return SCM_BOOL_T;
#ifdef SCM_BIGDIG
  } else if (SCM_BIGP (x)) {
    return SCM_BOOL_T;
#endif
  } else {
    return SCM_BOOL_F;
  }
}
#undef FUNC_NAME


SCM_DEFINE (scm_odd_p, "odd?", 1, 0, 0, 
            (SCM n),
	    "Return #t if N is an odd number, #f otherwise.")
#define FUNC_NAME s_scm_odd_p
{
  if (SCM_INUMP (n)) {
    return SCM_BOOL ((4 & SCM_UNPACK (n)) != 0);
#ifdef SCM_BIGDIG
  } else if (SCM_BIGP (n)) {
    return SCM_BOOL ((1 & SCM_BDIGITS (n) [0]) != 0);
#endif
  } else {
    SCM_WRONG_TYPE_ARG (1, n);
  }
}
#undef FUNC_NAME


SCM_DEFINE (scm_even_p, "even?", 1, 0, 0, 
            (SCM n),
	    "Return #t if N is an even number, #f otherwise.")
#define FUNC_NAME s_scm_even_p
{
  if (SCM_INUMP (n)) {
    return SCM_BOOL ((4 & SCM_UNPACK (n)) == 0);
#ifdef SCM_BIGDIG
  } else if (SCM_BIGP (n)) {
    return SCM_BOOL ((1 & SCM_BDIGITS (n) [0]) == 0);
#endif
  } else {
    SCM_WRONG_TYPE_ARG (1, n);
  }
}
#undef FUNC_NAME


SCM_GPROC (s_abs, "abs", 1, 0, 0, scm_abs, g_abs);

SCM
scm_abs (SCM x)
{
  if (SCM_INUMP (x)) {
    long int xx = SCM_INUM (x);
    if (xx >= 0) {
      return x;
    } else if (SCM_POSFIXABLE (-xx)) {
      return SCM_MAKINUM (-xx);
    } else {
#ifdef SCM_BIGDIG
      return scm_long2big (-xx);
#else
      scm_num_overflow (s_abs);
#endif
    }
#ifdef SCM_BIGDIG
  } else if (SCM_BIGP (x)) {
    if (!SCM_BIGSIGN (x)) {
      return x;
    } else {
      return scm_copybig (x, 0);
    }
#endif
  } else {
    SCM_WTA_DISPATCH_1 (g_abs, x, 1, s_abs);
  }
}


SCM_GPROC (s_quotient, "quotient", 2, 0, 0, scm_quotient, g_quotient);

SCM
scm_quotient (SCM x, SCM y)
{
  if (SCM_INUMP (x)) {
    long xx = SCM_INUM (x);
    if (SCM_INUMP (y)) {
      long yy = SCM_INUM (y);
      if (yy == 0) {
	scm_num_overflow (s_quotient);
      } else {
	long z = xx / yy;
#ifdef BADIVSGNS
	{
#if (__TURBOC__ == 1)
	  long t = ((yy < 0) ? -xx : xx) % yy;
#else
	  long t = xx % yy;
#endif
	  if ((t < 0) && (xx > 0)) 
	    z--;
	  else if ((t > 0) && (xx < 0)) 
	    z++;
	}
#endif
	if (SCM_FIXABLE (z)) {
	  return SCM_MAKINUM (z);
	} else {
#ifdef SCM_BIGDIG
	  return scm_long2big (z);
#else
	  scm_num_overflow (s_quotient);
#endif
	}
      }
#ifdef SCM_BIGDIG
    } else if (SCM_BIGP (y)) {
      return SCM_INUM0;
#endif
    } else {
      SCM_WTA_DISPATCH_2 (g_quotient, x, y, SCM_ARG2, s_quotient);
    }
#ifdef SCM_BIGDIG
  } else if (SCM_BIGP (x)) {
    if (SCM_INUMP (y)) {
      long yy = SCM_INUM (y);
      if (yy == 0) {
	scm_num_overflow (s_quotient);
      } else if (yy == 1) {
	return x;
      } else {
	long z = yy < 0 ? -yy : yy;
	
	if (z < SCM_BIGRAD) {
	  SCM sw = scm_copybig (x, SCM_BIGSIGN (x) ? (yy > 0) : (yy < 0));
	  scm_divbigdig (SCM_BDIGITS (sw), SCM_NUMDIGS (sw), (SCM_BIGDIG) z);
	  return scm_normbig (sw);
	} else {
#ifndef SCM_DIGSTOOBIG
	  long w = scm_pseudolong (z);
	  return scm_divbigbig (SCM_BDIGITS (x), SCM_NUMDIGS (x),
				(SCM_BIGDIG *) & w, SCM_DIGSPERLONG,
				SCM_BIGSIGN (x) ? (yy > 0) : (yy < 0), 2);
#else
	  SCM_BIGDIG zdigs[SCM_DIGSPERLONG];
	  scm_longdigs (z, zdigs);
	  return scm_divbigbig (SCM_BDIGITS (x), SCM_NUMDIGS (x),
				zdigs, SCM_DIGSPERLONG,
				SCM_BIGSIGN (x) ? (yy > 0) : (yy < 0), 2);
#endif
	}
      }
    } else if (SCM_BIGP (y)) {
      return scm_divbigbig (SCM_BDIGITS (x), SCM_NUMDIGS (x),
			    SCM_BDIGITS (y), SCM_NUMDIGS (y),
			    SCM_BIGSIGN (x) ^ SCM_BIGSIGN (y), 2);
    } else {
      SCM_WTA_DISPATCH_2 (g_quotient, x, y, SCM_ARG2, s_quotient);
    }
#endif
  } else {
    SCM_WTA_DISPATCH_2 (g_quotient, x, y, SCM_ARG2, s_quotient);
  }
}


SCM_GPROC (s_remainder, "remainder", 2, 0, 0, scm_remainder, g_remainder);

SCM
scm_remainder (SCM x, SCM y)
{
  register long z;
#ifdef SCM_BIGDIG
  if (SCM_NINUMP (x))
    {
      SCM_GASSERT2 (SCM_BIGP (x),
		    g_remainder, x, y, SCM_ARG1, s_remainder);
      if (SCM_NINUMP (y))
	{
	  SCM_ASRTGO (SCM_BIGP (y), bady);
	  return scm_divbigbig (SCM_BDIGITS (x), SCM_NUMDIGS (x),
				SCM_BDIGITS (y), SCM_NUMDIGS (y),
				SCM_BIGSIGN (x), 0);
	}
      if (!(z = SCM_INUM (y)))
	goto ov;
      return scm_divbigint (x, z, SCM_BIGSIGN (x), 0);
    }
  if (SCM_NINUMP (y))
    {
      if (!SCM_BIGP (y))
	{
	bady:
	  SCM_WTA_DISPATCH_2 (g_remainder, x, y, SCM_ARG2, s_remainder);
	}
      return x;
    }
#else
  SCM_GASSERT2 (SCM_INUMP (x), g_remainder, x, y, SCM_ARG1, s_remainder);
  SCM_GASSERT2 (SCM_INUMP (y), g_remainder, x, y, SCM_ARG2, s_remainder);
#endif
  if (!(z = SCM_INUM (y)))
    {
    ov:
      scm_num_overflow (s_remainder);
    }
#if (__TURBOC__ == 1)
  if (z < 0)
    z = -z;
#endif
  z = SCM_INUM (x) % z;
#ifdef BADIVSGNS
  if (!z);
  else if (z < 0)
    if (x < 0);
    else
      z += SCM_INUM (y);
  else if (x < 0)
    z -= SCM_INUM (y);
#endif
  return SCM_MAKINUM (z);
}

SCM_GPROC (s_modulo, "modulo", 2, 0, 0, scm_modulo, g_modulo);

SCM
scm_modulo (SCM x, SCM y)
{
  if (SCM_INUMP (x)) {
    long xx = SCM_INUM (x);
    if (SCM_INUMP (y)) {
      long yy = SCM_INUM (y);
      if (yy == 0) {
	scm_num_overflow (s_modulo);
      } else {
#if (__TURBOC__ == 1)
	long z = ((yy < 0) ? -xx : xx) % yy;
#else
	long z = xx % yy;
#endif
	return SCM_MAKINUM (((yy < 0) ? (z > 0) : (z < 0)) ? z + yy : z);
      }
    } else {
#ifdef SCM_BIGDIG
      if (!SCM_BIGP (y)) {
	SCM_WTA_DISPATCH_2 (g_modulo, x, y, SCM_ARG2, s_modulo);
      } else {
	return (SCM_BIGSIGN (y) ? (xx > 0) : (xx < 0)) ? scm_sum (x, y) : x;
      }
#else
      SCM_WTA_DISPATCH_2 (g_modulo, x, y, SCM_ARG2, s_modulo);
#endif
    }
  } else {
#ifdef SCM_BIGDIG
    SCM_GASSERT2 (SCM_BIGP (x), g_modulo, x, y, SCM_ARG1, s_modulo);
    if (SCM_NINUMP (y)) {
      if (!SCM_BIGP (y)) {
	SCM_WTA_DISPATCH_2 (g_modulo, x, y, SCM_ARG2, s_modulo);
      } else {
	return scm_divbigbig (SCM_BDIGITS (x), SCM_NUMDIGS (x),
			      SCM_BDIGITS (y), SCM_NUMDIGS (y),
			      SCM_BIGSIGN (y),
			      (SCM_BIGSIGN (x) ^ SCM_BIGSIGN (y)) ? 1 : 0);
      }
    } else {
      long yy = SCM_INUM (y);
      if (yy == 0) {
	scm_num_overflow (s_modulo);
      } else {
	return scm_divbigint (x, yy, yy < 0,
			      (SCM_BIGSIGN (x) ? (yy > 0) : (yy < 0)) ? 1 : 0);
      }
    }
#else
    SCM_WTA_DISPATCH_2 (g_modulo, x, y, SCM_ARG2, s_modulo);
#endif
  }
}

SCM_GPROC1 (s_gcd, "gcd", scm_tc7_asubr, scm_gcd, g_gcd);

SCM
scm_gcd (SCM x, SCM y)
{
  long u, v, k, t;
  if (SCM_UNBNDP (y))
    return SCM_UNBNDP (x) ? SCM_INUM0 : x;
 tailrec:
#ifdef SCM_BIGDIG
  if (SCM_NINUMP (x))
    {
    big_gcd:
      SCM_GASSERT2 (SCM_BIGP (x),
		    g_gcd, x, y, SCM_ARG1, s_gcd);
      if (SCM_BIGSIGN (x))
	x = scm_copybig (x, 0);
    newy:
      if (SCM_NINUMP (y))
	{
	  SCM_GASSERT2 (SCM_BIGP (y),
			g_gcd, x, y, SCM_ARGn, s_gcd);
	  if (SCM_BIGSIGN (y))
	    y = scm_copybig (y, 0);
	  switch (scm_bigcomp (x, y))
	    {
	    case -1:
	    swaprec:
	    {
	      SCM t = scm_remainder (x, y);
	      x = y;
	      y = t;
	    }
	    goto tailrec;
	    case 0:
	      return x;
	    case 1:
	      y = scm_remainder (y, x);
	      goto newy;
	    }
	  /* instead of the switch, we could just
	     return scm_gcd (y, scm_modulo (x, y)); */
	}
      if (SCM_EQ_P (y, SCM_INUM0))
	return x;
      goto swaprec;
    }
  if (SCM_NINUMP (y))
    {
      SCM t = x;
      x = y;
      y = t;
      goto big_gcd;
    }
#else
  SCM_GASSERT2 (SCM_INUMP (x), g_gcd, x, y, SCM_ARG1, s_gcd);
  SCM_GASSERT2 (SCM_INUMP (y), g_gcd, x, y, SCM_ARGn, s_gcd);
#endif
  u = SCM_INUM (x);
  if (u < 0)
    u = -u;
  v = SCM_INUM (y);
  if (v < 0)
    v = -v;
  else if (0 == v)
    goto getout;
  if (0 == u)
    {
      u = v;
      goto getout;
    }
  for (k = 1; !(1 & ((int) u | (int) v)); k <<= 1, u >>= 1, v >>= 1);
  if (1 & (int) u)
    t = -v;
  else
    {
      t = u;
    b3:
      t = SCM_SRS (t, 1);
    }
  if (!(1 & (int) t))
    goto b3;
  if (t > 0)
    u = t;
  else
    v = -t;
  if ((t = u - v))
    goto b3;
  u = u * k;
 getout:
  if (!SCM_POSFIXABLE (u))
#ifdef SCM_BIGDIG
    return scm_long2big (u);
#else
  scm_num_overflow (s_gcd);
#endif
  return SCM_MAKINUM (u);
}

SCM_GPROC1 (s_lcm, "lcm", scm_tc7_asubr, scm_lcm, g_lcm);

SCM
scm_lcm (SCM n1, SCM n2)
{
  SCM d;
#ifndef SCM_BIGDIG
  SCM_GASSERT2 (SCM_INUMP (n1) || SCM_UNBNDP (n1),
		g_lcm, n1, n2, SCM_ARG1, s_lcm);
  SCM_GASSERT2 (SCM_INUMP (n2) || SCM_UNBNDP (n2),
		g_lcm, n1, n2, SCM_ARGn, s_lcm);
#else
  SCM_GASSERT2 (SCM_INUMP (n1)
		|| SCM_UNBNDP (n1)
		|| (SCM_BIGP (n1)),
		g_lcm, n1, n2, SCM_ARG1, s_lcm);
  SCM_GASSERT2 (SCM_INUMP (n2)
		|| SCM_UNBNDP (n2)
		|| (SCM_BIGP (n2)),
		g_lcm, n1, n2, SCM_ARGn, s_lcm);
#endif
  if (SCM_UNBNDP (n2))
    {
      n2 = SCM_MAKINUM (1L);
      if (SCM_UNBNDP (n1))
	return n2;
    }
  
  d = scm_gcd (n1, n2);
  if (SCM_EQ_P (d, SCM_INUM0))
    return d;
  return scm_abs (scm_product (n1, scm_quotient (n2, d)));
}

#ifndef scm_long2num
#define SCM_LOGOP_RETURN(x) scm_ulong2num(x)
#else
#define SCM_LOGOP_RETURN(x) SCM_MAKINUM(x)
#endif


/* Emulating 2's complement bignums with sign magnitude arithmetic:

   Logand:
   X	Y	Result	Method:
		 (len)
   +	+	+ x	(map digit:logand X Y)
   +	-	+ x	(map digit:logand X (lognot (+ -1 Y)))
   -	+	+ y	(map digit:logand (lognot (+ -1 X)) Y)
   -	-	-	(+ 1 (map digit:logior (+ -1 X) (+ -1 Y)))

   Logior:
   X	Y	Result	Method:

   +	+	+	(map digit:logior X Y)
   +	-	- y	(+ 1 (map digit:logand (lognot X) (+ -1 Y)))
   -	+	- x	(+ 1 (map digit:logand (+ -1 X) (lognot Y)))
   -	-	- x	(+ 1 (map digit:logand (+ -1 X) (+ -1 Y)))

   Logxor:
   X	Y	Result	Method:

   +	+	+	(map digit:logxor X Y)
   +	-	-	(+ 1 (map digit:logxor X (+ -1 Y)))
   -	+	-	(+ 1 (map digit:logxor (+ -1 X) Y))
   -	-	+	(map digit:logxor (+ -1 X) (+ -1 Y))

   Logtest:
   X	Y	Result

   +	+	(any digit:logand X Y)
   +	-	(any digit:logand X (lognot (+ -1 Y)))
   -	+	(any digit:logand (lognot (+ -1 X)) Y)
   -	-	#t

*/

#ifdef SCM_BIGDIG

SCM scm_copy_big_dec(SCM b, int sign);
SCM scm_copy_smaller(SCM_BIGDIG *x, scm_sizet nx, int zsgn);
SCM scm_big_ior(SCM_BIGDIG *x, scm_sizet nx, int xsgn, SCM bigy);
SCM scm_big_xor(SCM_BIGDIG *x, scm_sizet nx, int xsgn, SCM bigy);
SCM scm_big_and(SCM_BIGDIG *x, scm_sizet nx, int xsgn, SCM bigy, int zsgn);
SCM scm_big_test(SCM_BIGDIG *x, scm_sizet nx, int xsgn, SCM bigy);

SCM scm_copy_big_dec(SCM b, int sign)
{
  long num = -1;
  scm_sizet nx = SCM_NUMDIGS(b);
  scm_sizet i = 0;
  SCM ans = scm_mkbig(nx, sign);
  SCM_BIGDIG *src = SCM_BDIGITS(b), *dst = SCM_BDIGITS(ans);
  if SCM_BIGSIGN(b) do {
    num += src[i];
    if (num < 0) {dst[i] = num + SCM_BIGRAD; num = -1;}
    else {dst[i] = SCM_BIGLO(num); num = 0;}
  } while (++i < nx);
  else
    while (nx--) dst[nx] = src[nx];
  return ans;
}

SCM scm_copy_smaller(SCM_BIGDIG *x, scm_sizet nx, int zsgn)
{
  long num = -1;
  scm_sizet i = 0;
  SCM z = scm_mkbig(nx, zsgn);
  SCM_BIGDIG *zds = SCM_BDIGITS(z);
  if (zsgn) do {
    num += x[i];
    if (num < 0) {zds[i] = num + SCM_BIGRAD; num = -1;}
    else {zds[i] = SCM_BIGLO(num); num = 0;}
  } while (++i < nx);
  else do zds[i] = x[i]; while (++i < nx);
  return z;
}

SCM scm_big_ior(SCM_BIGDIG *x, scm_sizet nx, int xsgn, SCM bigy)
/* Assumes nx <= SCM_NUMDIGS(bigy) */
/* Assumes xsgn equals either 0 or SCM_BIGSIGNFLAG */
{
  long num = -1;
  scm_sizet i = 0, ny = SCM_NUMDIGS(bigy);
  SCM z = scm_copy_big_dec (bigy, xsgn & SCM_BIGSIGN (bigy));
  SCM_BIGDIG *zds = SCM_BDIGITS(z);
  if (xsgn) {
    do {
      num += x[i];
      if (num < 0) {zds[i] |= num + SCM_BIGRAD; num = -1;}
      else {zds[i] |= SCM_BIGLO(num); num = 0;}
    } while (++i < nx);
    /* =========  Need to increment zds now =========== */
    i = 0; num = 1;
    while (i < ny) {
      num += zds[i];
      zds[i++] = SCM_BIGLO(num);
      num = SCM_BIGDN(num);
      if (!num) return z;
    }
    scm_adjbig(z, 1 + ny);		/* OOPS, overflowed into next digit. */
    SCM_BDIGITS(z)[ny] = 1;
    return z;
  }
  else do zds[i] = zds[i] | x[i]; while (++i < nx);
  return z;
}

SCM scm_big_xor(SCM_BIGDIG *x, scm_sizet nx, int xsgn, SCM bigy)
/* Assumes nx <= SCM_NUMDIGS(bigy) */
/* Assumes xsgn equals either 0 or SCM_BIGSIGNFLAG */
{
  long num = -1;
  scm_sizet i = 0, ny = SCM_NUMDIGS(bigy);
  SCM z = scm_copy_big_dec(bigy, xsgn ^ SCM_BIGSIGN(bigy));
  SCM_BIGDIG *zds = SCM_BDIGITS(z);
  if (xsgn) do {
    num += x[i];
    if (num < 0) {zds[i] ^= num + SCM_BIGRAD; num = -1;}
    else {zds[i] ^= SCM_BIGLO(num); num = 0;}
  } while (++i < nx);
  else do {
    zds[i] = zds[i] ^ x[i];
  } while (++i < nx);

  if (xsgn ^ SCM_BIGSIGN(bigy)) {
    /* =========  Need to increment zds now =========== */
    i = 0; num = 1;
    while (i < ny) {
      num += zds[i];
      zds[i++] = SCM_BIGLO(num);
      num = SCM_BIGDN(num);
      if (!num) return scm_normbig(z);
    }
  }
  return scm_normbig(z);
}

SCM scm_big_and(SCM_BIGDIG *x, scm_sizet nx, int xsgn, SCM bigy, int zsgn)
/* Assumes nx <= SCM_NUMDIGS(bigy) */
/* Assumes xsgn equals either 0 or SCM_BIGSIGNFLAG */
/* return sign equals either 0 or SCM_BIGSIGNFLAG */
{
  long num = -1;
  scm_sizet i = 0;
  SCM z;
  SCM_BIGDIG *zds;
  if (xsgn==zsgn) {
    z = scm_copy_smaller(x, nx, zsgn);
    x = SCM_BDIGITS(bigy);
    xsgn = SCM_BIGSIGN(bigy);
  }
  else z = scm_copy_big_dec(bigy, zsgn);
  zds = SCM_BDIGITS(z);

  if (zsgn) {
    if (xsgn) do {
      num += x[i];
      if (num < 0) {zds[i] &= num + SCM_BIGRAD; num = -1;}
      else {zds[i] &= SCM_BIGLO(num); num = 0;}
    } while (++i < nx);
    else do zds[i] = zds[i] & ~x[i]; while (++i < nx);
    /* =========  need to increment zds now =========== */
    i = 0; num = 1;
    while (i < nx) {
      num += zds[i];
      zds[i++] = SCM_BIGLO(num);
      num = SCM_BIGDN(num);
      if (!num) return scm_normbig(z);
    }
  }
  else if (xsgn) do {
    num += x[i];
    if (num < 0) {zds[i] &= num + SCM_BIGRAD; num = -1;}
    else {zds[i] &= ~SCM_BIGLO(num); num = 0;}
  } while (++i < nx);
  else do zds[i] = zds[i] & x[i]; while (++i < nx);
  return scm_normbig(z);
}

SCM scm_big_test(SCM_BIGDIG *x, scm_sizet nx, int xsgn, SCM bigy)
/* Assumes nx <= SCM_NUMDIGS(bigy) */
/* Assumes xsgn equals either 0 or SCM_BIGSIGNFLAG */
{
  SCM_BIGDIG *y;
  scm_sizet i = 0;
  long num = -1;
  if (SCM_BIGSIGN(bigy) & xsgn) return SCM_BOOL_T;
  if (SCM_NUMDIGS(bigy) != nx && xsgn) return SCM_BOOL_T;
  y = SCM_BDIGITS(bigy);
  if (xsgn)
    do {
      num += x[i];
      if (num < 0) {
	if (y[i] & ~(num + SCM_BIGRAD)) return SCM_BOOL_T;
	num = -1;
      }
      else {
	if (y[i] & ~SCM_BIGLO(num)) return SCM_BOOL_T;
	num = 0;
      }
    } while (++i < nx);
  else if SCM_BIGSIGN(bigy)
    do {
      num += y[i];
      if (num < 0) {
	if (x[i] & ~(num + SCM_BIGRAD)) return SCM_BOOL_T;
	num = -1;
      }
      else {
	if (x[i] & ~SCM_BIGLO(num)) return SCM_BOOL_T;
	num = 0;
      }
    } while (++i < nx);
  else
    do if (x[i] & y[i]) return SCM_BOOL_T;
    while (++i < nx);
  return SCM_BOOL_F;
}

#endif

SCM_DEFINE1 (scm_logand, "logand", scm_tc7_asubr,
             (SCM n1, SCM n2),
	     "Returns the integer which is the bit-wise AND of the two integer\n"
	     "arguments.\n\n"
	     "Example:\n"
	     "@lisp\n"
	     "(number->string (logand #b1100 #b1010) 2)\n"
	     "   @result{} \"1000\"")
#define FUNC_NAME s_scm_logand
{
  if (SCM_UNBNDP (n2))
    {
      if (SCM_UNBNDP (n1))
	return SCM_MAKINUM (-1);
#ifndef SCM_RECKLESS
      if (!(SCM_NUMBERP (n1)))
	  badx: SCM_WTA (SCM_ARG1, n1);
#endif
      return n1;
    }
#ifdef SCM_BIGDIG
  if SCM_NINUMP(n1) {
    SCM t;
    SCM_ASRTGO(SCM_NIMP(n1) && SCM_BIGP(n1), badx);
    if SCM_INUMP(n2) {t = n1; n1 = n2; n2 = t; goto intbig;}
    SCM_ASRTGO(SCM_NIMP(n2) && SCM_BIGP(n2), bady);
    if (SCM_NUMDIGS(n1) > SCM_NUMDIGS(n2)) {t = n1; n1 = n2; n2 = t;}
    if ((SCM_BIGSIGN(n1)) && SCM_BIGSIGN(n2))
      return scm_big_ior (SCM_BDIGITS(n1),
			  SCM_NUMDIGS(n1),
			  SCM_BIGSIGNFLAG,
			  n2);
    return scm_big_and (SCM_BDIGITS(n1),
			SCM_NUMDIGS(n1),
			SCM_BIGSIGN(n1),
			n2,
			0);
  }
  if SCM_NINUMP(n2) {
# ifndef SCM_RECKLESS
      if (!(SCM_NIMP(n2) && SCM_BIGP(n2)))
	  bady: SCM_WTA (SCM_ARG2, n2);
# endif
  intbig: {
# ifndef SCM_DIGSTOOBIG
    long z = scm_pseudolong(SCM_INUM(n1));
    if ((n1 < 0) && SCM_BIGSIGN(n2))
      return scm_big_ior((SCM_BIGDIG *)&z, SCM_DIGSPERLONG, SCM_BIGSIGNFLAG, n2);
    return scm_big_and((SCM_BIGDIG *)&z, SCM_DIGSPERLONG, (n1 < 0) ? SCM_BIGSIGNFLAG : 0, n2, 0);
# else
    SCM_BIGDIG zdigs[SCM_DIGSPERLONG];
    scm_longdigs(SCM_INUM(n1), zdigs);
    if ((n1 < 0) && SCM_BIGSIGN(n2))
      return scm_big_ior(zdigs, SCM_DIGSPERLONG, SCM_BIGSIGNFLAG, n2);
    return scm_big_and(zdigs, SCM_DIGSPERLONG, (n1 < 0) ? SCM_BIGSIGNFLAG : 0, n2, 0);
# endif
  }}
#else
  SCM_ASRTGO(SCM_INUMP(n1), badx);
  SCM_ASSERT(SCM_INUMP(n2), n2, SCM_ARG2, FUNC_NAME);
#endif
  return SCM_MAKINUM(SCM_INUM(n1) & SCM_INUM(n2));
}
#undef FUNC_NAME

SCM_DEFINE1 (scm_logior, "logior", scm_tc7_asubr,
             (SCM n1, SCM n2),
	     "Returns the integer which is the bit-wise OR of the two integer\n"
	     "arguments.\n\n"
	     "Example:\n"
	     "@lisp\n"
	     "(number->string (logior #b1100 #b1010) 2)\n"
	     "   @result{} \"1110\"\n"
	     "@end lisp")
#define FUNC_NAME s_scm_logior
{
  if (SCM_UNBNDP (n2))
    {
      if (SCM_UNBNDP (n1))
	return SCM_INUM0;
#ifndef SCM_RECKLESS
    if (!(SCM_NUMBERP(n1)))
    badx: SCM_WTA(SCM_ARG1, n1);
#endif
      return n1;
    }
#ifdef SCM_BIGDIG
  if SCM_NINUMP(n1) {
    SCM t;
    SCM_ASRTGO(SCM_NIMP(n1) && SCM_BIGP(n1), badx);
    if SCM_INUMP(n2) {t = n1; n1 = n2; n2 = t; goto intbig;}
    SCM_ASRTGO(SCM_NIMP(n2) && SCM_BIGP(n2), bady);
    if (SCM_NUMDIGS(n1) > SCM_NUMDIGS(n2)) {t = n1; n1 = n2; n2 = t;}
    if ((!SCM_BIGSIGN(n1)) && !SCM_BIGSIGN(n2))
      return scm_big_ior(SCM_BDIGITS(n1), SCM_NUMDIGS(n1), SCM_BIGSIGN(n1), n2);
    return scm_big_and(SCM_BDIGITS(n1), SCM_NUMDIGS(n1), SCM_BIGSIGN(n1), n2, SCM_BIGSIGNFLAG);
  }
  if SCM_NINUMP(n2) {
# ifndef SCM_RECKLESS
    if (!(SCM_NIMP(n2) && SCM_BIGP(n2)))
    bady: SCM_WTA(SCM_ARG2, n2);
# endif
  intbig: {
# ifndef SCM_DIGSTOOBIG
    long z = scm_pseudolong(SCM_INUM(n1));
    if ((!(n1 < 0)) && !SCM_BIGSIGN(n2))
      return scm_big_ior((SCM_BIGDIG *)&z, SCM_DIGSPERLONG, (n1 < 0) ? SCM_BIGSIGNFLAG : 0, n2);
    return scm_big_and((SCM_BIGDIG *)&z, SCM_DIGSPERLONG, (n1 < 0) ? SCM_BIGSIGNFLAG : 0, n2, SCM_BIGSIGNFLAG);
# else
    BIGDIG zdigs[DIGSPERLONG];
    scm_longdigs(SCM_INUM(n1), zdigs);
    if ((!(n1 < 0)) && !SCM_BIGSIGN(n2))
      return scm_big_ior(zdigs, SCM_DIGSPERLONG, (n1 < 0) ? SCM_BIGSIGNFLAG : 0, n2);
    return scm_big_and(zdigs, SCM_DIGSPERLONG, (n1 < 0) ? SCM_BIGSIGNFLAG : 0, n2, SCM_BIGSIGNFLAG);
# endif
  }}
#else
  SCM_ASRTGO(SCM_INUMP(n1), badx);
  SCM_ASSERT(SCM_INUMP(n2), n2, SCM_ARG2, FUNC_NAME);
#endif
  return SCM_MAKINUM(SCM_INUM(n1) | SCM_INUM(n2));
}
#undef FUNC_NAME

SCM_DEFINE1 (scm_logxor, "logxor", scm_tc7_asubr,
             (SCM n1, SCM n2),
	     "Returns the integer which is the bit-wise XOR of the two integer\n"
	     "arguments.\n\n"
	     "Example:\n"
	     "@lisp\n"
	     "(number->string (logxor #b1100 #b1010) 2)\n"
	     "   @result{} \"110\"\n"
	     "@end lisp")
#define FUNC_NAME s_scm_logxor
{
  if (SCM_UNBNDP (n2))
    {
      if (SCM_UNBNDP (n1))
	return SCM_INUM0;
#ifndef SCM_RECKLESS
      if (!(SCM_NUMBERP(n1)))
	  badx: SCM_WTA(SCM_ARG1, n1);
#endif
      return n1;
    }
#ifdef SCM_BIGDIG
  if SCM_NINUMP(n1) {
      SCM t;
      SCM_ASRTGO(SCM_NIMP(n1) && SCM_BIGP(n1), badx);
      if SCM_INUMP(n2)
	  {
	      t = n1;
	      n1 = n2;
	      n2 = t;
	      goto intbig;
	  }
      SCM_ASRTGO(SCM_NIMP(n2) && SCM_BIGP(n2), bady);
      if (SCM_NUMDIGS(n1) > SCM_NUMDIGS(n2))
          {
	      t = n1;
	      n1 = n2;
	      n2 = t;
	  }
      return scm_big_xor(SCM_BDIGITS(n1), SCM_NUMDIGS(n1), SCM_BIGSIGN(n1), n2);
  }
  if SCM_NINUMP(n2) {
# ifndef SCM_RECKLESS
  if (!(SCM_NIMP(n2) && SCM_BIGP(n2)))
  bady: SCM_WTA (SCM_ARG2, n2);
# endif
  intbig: 
      {
# ifndef SCM_DIGSTOOBIG
	  long z = scm_pseudolong(SCM_INUM(n1));
	  return scm_big_xor((SCM_BIGDIG *)&z, SCM_DIGSPERLONG, (n1 < 0) ? SCM_BIGSIGNFLAG : 0, n2);
# else
	  SCM_BIGDIG zdigs[SCM_DIGSPERLONG];
	  scm_longdigs(SCM_INUM(n1), zdigs);
	  return scm_big_xor(zdigs, SCM_DIGSPERLONG, (n1 < 0) ? SCM_BIGSIGNFLAG : 0, n2);
# endif
      }
  }
#else
  SCM_ASRTGO(INUMP(n1), badx);
  SCM_ASSERT(INUMP(n2), n2, SCM_ARG2, FUNC_NAME);
#endif
  return SCM_MAKINUM(SCM_INUM(n1) ^ SCM_INUM(n2));
}
#undef FUNC_NAME

SCM_DEFINE (scm_logtest, "logtest", 2, 0, 0,
            (SCM n1, SCM n2),
	    "@example\n"
	    "(logtest j k) @equiv{} (not (zero? (logand j k)))\n\n"
	    "(logtest #b0100 #b1011) @result{} #f\n"
	    "(logtest #b0100 #b0111) @result{} #t\n"
	    "@end example")
#define FUNC_NAME s_scm_logtest
{
#ifndef SCM_RECKLESS
    if (!(SCM_NUMBERP(n1)))
    badx: SCM_WTA(SCM_ARG1, n1);
#endif
#ifdef SCM_BIGDIG
  if SCM_NINUMP(n1) {
    SCM t;
    SCM_ASRTGO(SCM_NIMP(n1) && SCM_BIGP(n1), badx);
    if SCM_INUMP(n2) {t = n1; n1 = n2; n2 = t; goto intbig;}
    SCM_ASRTGO(SCM_NIMP(n2) && SCM_BIGP(n2), bady);
    if (SCM_NUMDIGS(n1) > SCM_NUMDIGS(n2)) {t = n1; n1 = n2; n2 = t;}
    return scm_big_test(SCM_BDIGITS(n1), SCM_NUMDIGS(n1), SCM_BIGSIGN(n1), n2);
  }
  if SCM_NINUMP(n2) {
# ifndef SCM_RECKLESS
    if (!(SCM_NIMP(n2) && SCM_BIGP(n2)))
    bady: SCM_WTA(SCM_ARG2, n2);
# endif
  intbig: {
# ifndef SCM_DIGSTOOBIG
    long z = scm_pseudolong(SCM_INUM(n1));
    return scm_big_test((SCM_BIGDIG *)&z, SCM_DIGSPERLONG, (n1 < 0) ? SCM_BIGSIGNFLAG : 0, n2);
# else
    SCM_BIGDIG zdigs[SCM_DIGSPERLONG];
    scm_longdigs(SCM_INUM(n1), zdigs);
    return scm_big_test(zdigs, SCM_DIGSPERLONG, (n1 < 0) ? SCM_BIGSIGNFLAG : 0, n2);
# endif
  }}
#else
  SCM_ASRTGO(SCM_INUMP(n1), badx);
  SCM_ASSERT(SCM_INUMP(n2), n2, SCM_ARG2, FUNC_NAME);
#endif
  return (SCM_INUM(n1) & SCM_INUM(n2)) ? SCM_BOOL_T : SCM_BOOL_F;
}
#undef FUNC_NAME


SCM_DEFINE (scm_logbit_p, "logbit?", 2, 0, 0,
            (SCM index, SCM j),
	    "@example\n"
	    "(logbit? index j) @equiv{} (logtest (integer-expt 2 index) j)\n\n"
	    "(logbit? 0 #b1101) @result{} #t\n"
	    "(logbit? 1 #b1101) @result{} #f\n"
	    "(logbit? 2 #b1101) @result{} #t\n"
	    "(logbit? 3 #b1101) @result{} #t\n"
	    "(logbit? 4 #b1101) @result{} #f\n"
	    "@end example")
#define FUNC_NAME s_scm_logbit_p
{
  SCM_ASSERT(SCM_INUMP(index) && SCM_INUM(index) >= 0, index, SCM_ARG1, FUNC_NAME);
#ifdef SCM_BIGDIG
  if SCM_NINUMP(j) {
    SCM_ASSERT(SCM_NIMP(j) && SCM_BIGP(j), j, SCM_ARG2, FUNC_NAME);
    if (SCM_NUMDIGS(j) * SCM_BITSPERDIG < SCM_INUM(index)) return SCM_BOOL_F;
    else if SCM_BIGSIGN(j) {
      long num = -1;
      scm_sizet i = 0;
      SCM_BIGDIG *x = SCM_BDIGITS(j);
      scm_sizet nx = SCM_INUM(index)/SCM_BITSPERDIG;
      while (!0) {
	num += x[i];
	if (nx==i++)
	  return ((1L << (SCM_INUM(index)%SCM_BITSPERDIG)) & num) ? SCM_BOOL_F : SCM_BOOL_T;
	if (num < 0) num = -1;
	else num = 0;
      }
    }
    else return (SCM_BDIGITS(j)[SCM_INUM(index)/SCM_BITSPERDIG] &
		 (1L << (SCM_INUM(index)%SCM_BITSPERDIG))) ? SCM_BOOL_T : SCM_BOOL_F;
  }
#else
  SCM_ASSERT(SCM_INUMP(j), j, SCM_ARG2, FUNC_NAME);
#endif
  return ((1L << SCM_INUM(index)) & SCM_INUM(j)) ? SCM_BOOL_T : SCM_BOOL_F;
}
#undef FUNC_NAME

SCM_DEFINE (scm_lognot, "lognot", 1, 0, 0, 
            (SCM n),
	    "Returns the integer which is the 2s-complement of the integer argument.\n\n"
	    "Example:\n"
	    "@lisp\n"
	    "(number->string (lognot #b10000000) 2)\n"
	    "   @result{} \"-10000001\"\n"
	    "(number->string (lognot #b0) 2)\n"
	    "   @result{} \"-1\"\n"
	    "@end lisp\n"
	    "")
#define FUNC_NAME s_scm_lognot
{
  return scm_difference (SCM_MAKINUM (-1L), n);
}
#undef FUNC_NAME

SCM_DEFINE (scm_integer_expt, "integer-expt", 2, 0, 0,
            (SCM n, SCM k),
	    "Returns @var{n} raised to the non-negative integer exponent @var{k}.\n\n"
	    "Example:\n"
	    "@lisp\n"
	    "(integer-expt 2 5)\n"
	    "   @result{} 32\n"
	    "(integer-expt -3 3)\n"
	    "   @result{} -27\n"
	    "@end lisp")
#define FUNC_NAME s_scm_integer_expt
{
  SCM acc = SCM_MAKINUM (1L);
  int i2;
#ifdef SCM_BIGDIG
  if (SCM_EQ_P (n, SCM_INUM0) || SCM_EQ_P (n, acc))
    return n;
  else if (SCM_EQ_P (n, SCM_MAKINUM (-1L)))
    return SCM_FALSEP (scm_even_p (k)) ? n : acc;
#endif
  SCM_VALIDATE_ULONG_COPY (2,k,i2);
  if (i2 < 0)
    {
      i2 = -i2;
      n = scm_divide (n, SCM_UNDEFINED);
    }
  while (1)
    {
      if (0 == i2)
	return acc;
      if (1 == i2)
	return scm_product (acc, n);
      if (i2 & 1)
	acc = scm_product (acc, n);
      n = scm_product (n, n);
      i2 >>= 1;
    }
}
#undef FUNC_NAME

SCM_DEFINE (scm_ash, "ash", 2, 0, 0,
            (SCM n, SCM cnt),
	    "The function ash performs an arithmetic shift left by CNT bits\n"
	    "(or shift right, if CNT is negative).  'Arithmetic' means, that\n"
            "the function does not guarantee to keep the bit structure of N,\n"
            "but rather guarantees that the result will always be rounded\n"
	    "towards minus infinity.  Therefore, the results of ash and a\n"
	    "corresponding bitwise shift will differ if N is negative.\n\n"
	    "Formally, the function returns an integer equivalent to\n"
	    "@code{(inexact->exact (floor (* N (expt 2 CNT))))}.@refill\n\n"
	    "Example:\n"
	    "@lisp\n"
	    "(number->string (ash #b1 3) 2)\n"
	    "   @result{} \"1000\""
	    "(number->string (ash #b1010 -1) 2)"
	    "   @result{} \"101\""
	    "@end lisp")
#define FUNC_NAME s_scm_ash
{
  long bits_to_shift;

#ifndef SCM_BIGDIG
  SCM_VALIDATE_INUM (1, n)
#endif
  SCM_VALIDATE_INUM (2, cnt);

  bits_to_shift = SCM_INUM (cnt);
#ifdef SCM_BIGDIG
  if (bits_to_shift < 0) {
    /* Shift right by abs(cnt) bits.  This is realized as a division by
       div:=2^abs(cnt).  However, to guarantee the floor rounding, negative
       values require some special treatment.
     */
    SCM div = scm_integer_expt (SCM_MAKINUM (2), SCM_MAKINUM (-bits_to_shift));
    if (SCM_FALSEP (scm_negative_p (n)))
      return scm_quotient (n, div);
    else
      return scm_sum (SCM_MAKINUM (-1L),
		      scm_quotient (scm_sum (SCM_MAKINUM (1L), n), div));
  } else
    /* Shift left is done by multiplication with 2^CNT */
    return scm_product (n, scm_integer_expt (SCM_MAKINUM (2), cnt));
#else
  if (bits_to_shift < 0)
    /* Signed right shift (SCM_SRS does it right) by abs(cnt) bits. */
    return SCM_MAKINUM (SCM_SRS (SCM_INUM (n), -bits_to_shift));
  else {
    /* Shift left, but make sure not to leave the range of inums */
    SCM res = SCM_MAKINUM (SCM_INUM (n) << cnt);
    if (SCM_INUM (res) >> cnt != SCM_INUM (n))
      scm_num_overflow (FUNC_NAME);
    return res;
  }
#endif
}
#undef FUNC_NAME

/* GJB:FIXME: do not use SCMs as integers! */
SCM_DEFINE (scm_bit_extract, "bit-extract", 3, 0, 0,
            (SCM n, SCM start, SCM end),
	    "Returns the integer composed of the @var{start} (inclusive) through\n"
	    "@var{end} (exclusive) bits of @var{n}.  The @var{start}th bit becomes\n"
	    "the 0-th bit in the result.@refill\n\n"
	    "Example:\n"
	    "@lisp\n"
	    "(number->string (bit-extract #b1101101010 0 4) 2)\n"
	    "   @result{} \"1010\"\n"
	    "(number->string (bit-extract #b1101101010 4 9) 2)\n"
	    "   @result{} \"10110\"\n"
	    "@end lisp")
#define FUNC_NAME s_scm_bit_extract
{
  int istart, iend;
  SCM_VALIDATE_INUM (1,n);
  SCM_VALIDATE_INUM_MIN_COPY (2,start,0,istart);
  SCM_VALIDATE_INUM_MIN_COPY (3, end, 0, iend);
  SCM_ASSERT_RANGE (3, end, (iend >= istart));
#ifdef SCM_BIGDIG
  if (SCM_NINUMP (n))
    return
      scm_logand (scm_difference (scm_integer_expt (SCM_MAKINUM (2),
						    SCM_MAKINUM (iend - istart)),
				  SCM_MAKINUM (1L)),
		  scm_ash (n, SCM_MAKINUM (-istart)));
#else
  SCM_VALIDATE_INUM (1,n);
#endif
  return SCM_MAKINUM ((SCM_INUM (n) >> istart) & ((1L << (iend - istart)) - 1));
}
#undef FUNC_NAME

static const char scm_logtab[] = {
  0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4
};

SCM_DEFINE (scm_logcount, "logcount", 1, 0, 0,
            (SCM n),
	    "Returns the number of bits in integer @var{n}.  If integer is positive,\n"
	    "the 1-bits in its binary representation are counted.  If negative, the\n"
	    "0-bits in its two's-complement binary representation are counted.  If 0,\n"
	    "0 is returned.\n\n"
	    "Example:\n"
	    "@lisp\n"
	    "(logcount #b10101010)\n"
	    "   @result{} 4\n"
	    "(logcount 0)\n"
	    "   @result{} 0\n"
	    "(logcount -2)\n"
	    "   @result{} 1\n"
	    "@end lisp")
#define FUNC_NAME s_scm_logcount
{
  register unsigned long c = 0;
  register long nn;
#ifdef SCM_BIGDIG
  if (SCM_NINUMP (n))
    {
      scm_sizet i;
      SCM_BIGDIG *ds, d;
      SCM_VALIDATE_BIGINT (1,n);
      if (SCM_BIGSIGN (n))
	return scm_logcount (scm_difference (SCM_MAKINUM (-1L), n));
      ds = SCM_BDIGITS (n);
      for (i = SCM_NUMDIGS (n); i--;)
	for (d = ds[i]; d; d >>= 4)
	  c += scm_logtab[15 & d];
      return SCM_MAKINUM (c);
    }
#else
  SCM_VALIDATE_INUM (1,n);
#endif
  if ((nn = SCM_INUM (n)) < 0)
    nn = -1 - nn;
  for (; nn; nn >>= 4)
    c += scm_logtab[15 & nn];
  return SCM_MAKINUM (c);
}
#undef FUNC_NAME


static const char scm_ilentab[] = {
  0, 1, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4
};

SCM_DEFINE (scm_integer_length, "integer-length", 1, 0, 0,
            (SCM n),
	    "Returns the number of bits neccessary to represent @var{n}.\n\n"
	    "Example:\n"
	    "@lisp\n"
	    "(integer-length #b10101010)\n"
	    "   @result{} 8\n"
	    "(integer-length 0)\n"
	    "   @result{} 0\n"
	    "(integer-length #b1111)\n"
	    "   @result{} 4\n"
	    "@end lisp")
#define FUNC_NAME s_scm_integer_length
{
  register unsigned long c = 0;
  register long nn;
  unsigned int l = 4;
#ifdef SCM_BIGDIG
  if (SCM_NINUMP (n))
    {
      SCM_BIGDIG *ds, d;
      SCM_VALIDATE_BIGINT (1,n);
      if (SCM_BIGSIGN (n))
	return scm_integer_length (scm_difference (SCM_MAKINUM (-1L), n));
      ds = SCM_BDIGITS (n);
      d = ds[c = SCM_NUMDIGS (n) - 1];
      for (c *= SCM_BITSPERDIG; d; d >>= 4)
	{
	  c += 4;
	  l = scm_ilentab[15 & d];
	}
      return SCM_MAKINUM (c - 4 + l);
    }
#else
  SCM_VALIDATE_INUM (1,n);
#endif
  if ((nn = SCM_INUM (n)) < 0)
    nn = -1 - nn;
  for (; nn; nn >>= 4)
    {
      c += 4;
      l = scm_ilentab[15 & nn];
    }
  return SCM_MAKINUM (c - 4 + l);
}
#undef FUNC_NAME


#ifdef SCM_BIGDIG
static const char s_bignum[] = "bignum";

SCM
scm_mkbig (scm_sizet nlen, int sign)
{
  SCM v;
  /* Cast to long int to avoid signed/unsigned comparison warnings.  */
  if ((( ((long int) nlen) << SCM_BIGSIZEFIELD) >> SCM_BIGSIZEFIELD)
      != (long int) nlen)
    scm_wta (SCM_MAKINUM (nlen), (char *) SCM_NALLOC, s_bignum);
  
  SCM_NEWCELL (v);
  SCM_DEFER_INTS;
  SCM_SETCHARS (v, scm_must_malloc ((long) (nlen * sizeof (SCM_BIGDIG)),
				    s_bignum));
  SCM_SETNUMDIGS (v, nlen, sign);
  SCM_ALLOW_INTS;
  return v;
}


SCM
scm_big2inum (SCM b, scm_sizet l)
{
  unsigned long num = 0;
  SCM_BIGDIG *tmp = SCM_BDIGITS (b);
  while (l--)
    num = SCM_BIGUP (num) + tmp[l];
  if (!SCM_BIGSIGN (b))
    {
      if (SCM_POSFIXABLE (num))
	return SCM_MAKINUM (num);
    }
  else if (SCM_UNEGFIXABLE (num))
    return SCM_MAKINUM (-num);
  return b;
}


static const char s_adjbig[] = "scm_adjbig";

SCM
scm_adjbig (SCM b, scm_sizet nlen)
{
  scm_sizet nsiz = nlen;
  if (((nsiz << SCM_BIGSIZEFIELD) >> SCM_BIGSIZEFIELD) != nlen)
    scm_wta (scm_ulong2num (nsiz), (char *) SCM_NALLOC, s_adjbig);

  SCM_DEFER_INTS;
  {
    SCM_BIGDIG *digits
      = ((SCM_BIGDIG *)
	 scm_must_realloc ((char *) SCM_CHARS (b),
			   (long) (SCM_NUMDIGS (b) * sizeof (SCM_BIGDIG)),
			   (long) (nsiz * sizeof (SCM_BIGDIG)), s_bignum));

    SCM_SETCHARS (b, digits);
    SCM_SETNUMDIGS (b, nsiz, SCM_BIGSIGN (b));
  }
  SCM_ALLOW_INTS;
  return b;
}



SCM
scm_normbig (SCM b)
{
#ifndef _UNICOS
  scm_sizet nlen = SCM_NUMDIGS (b);
#else
  int nlen = SCM_NUMDIGS (b); /* unsigned nlen breaks on Cray when nlen => 0 */
#endif
  SCM_BIGDIG *zds = SCM_BDIGITS (b);
  while (nlen-- && !zds[nlen]);
  nlen++;
  if (nlen * SCM_BITSPERDIG / SCM_CHAR_BIT <= sizeof (SCM))
    if (SCM_INUMP (b = scm_big2inum (b, (scm_sizet) nlen)))
      return b;
  if (SCM_NUMDIGS (b) == nlen)
    return b;
  return scm_adjbig (b, (scm_sizet) nlen);
}



SCM
scm_copybig (SCM b, int sign)
{
  scm_sizet i = SCM_NUMDIGS (b);
  SCM ans = scm_mkbig (i, sign);
  SCM_BIGDIG *src = SCM_BDIGITS (b), *dst = SCM_BDIGITS (ans);
  while (i--)
    dst[i] = src[i];
  return ans;
}



SCM
scm_long2big (long n)
{
  scm_sizet i = 0;
  SCM_BIGDIG *digits;
  SCM ans = scm_mkbig (SCM_DIGSPERLONG, n < 0);
  digits = SCM_BDIGITS (ans);
  if (n < 0)
    n = -n;
  while (i < SCM_DIGSPERLONG)
    {
      digits[i++] = SCM_BIGLO (n);
      n = SCM_BIGDN ((unsigned long) n);
    }
  return ans;
}

#ifdef HAVE_LONG_LONGS

SCM
scm_long_long2big (long_long n)
{
  scm_sizet i;
  SCM_BIGDIG *digits;
  SCM ans;
  int n_digits;

  {
    long tn;
    tn = (long) n;
    if ((long long) tn == n)
      return scm_long2big (tn);
  }

  {
    long_long tn;

    for (tn = n, n_digits = 0;
	 tn;
	 ++n_digits, tn = SCM_BIGDN ((ulong_long) tn))
      ;
  }

  i = 0;
  ans = scm_mkbig (n_digits, n < 0);
  digits = SCM_BDIGITS (ans);
  if (n < 0)
    n = -n;
  while (i < n_digits)
    {
      digits[i++] = SCM_BIGLO (n);
      n = SCM_BIGDN ((ulong_long) n);
    }
  return ans;
}
#endif


SCM
scm_2ulong2big (unsigned long *np)
{
  unsigned long n;
  scm_sizet i;
  SCM_BIGDIG *digits;
  SCM ans;

  ans = scm_mkbig (2 * SCM_DIGSPERLONG, 0);
  digits = SCM_BDIGITS (ans);

  n = np[0];
  for (i = 0; i < SCM_DIGSPERLONG; ++i)
    {
      digits[i] = SCM_BIGLO (n);
      n = SCM_BIGDN ((unsigned long) n);
    }
  n = np[1];
  for (i = 0; i < SCM_DIGSPERLONG; ++i)
    {
      digits[i + SCM_DIGSPERLONG] = SCM_BIGLO (n);
      n = SCM_BIGDN ((unsigned long) n);
    }
  return ans;
}



SCM
scm_ulong2big (unsigned long n)
{
  scm_sizet i = 0;
  SCM_BIGDIG *digits;
  SCM ans = scm_mkbig (SCM_DIGSPERLONG, 0);
  digits = SCM_BDIGITS (ans);
  while (i < SCM_DIGSPERLONG)
    {
      digits[i++] = SCM_BIGLO (n);
      n = SCM_BIGDN (n);
    }
  return ans;
}



int
scm_bigcomp (SCM x, SCM y)
{
  int xsign = SCM_BIGSIGN (x);
  int ysign = SCM_BIGSIGN (y);
  scm_sizet xlen, ylen;

  /* Look at the signs, first.  */
  if (ysign < xsign)
    return 1;
  if (ysign > xsign)
    return -1;

  /* They're the same sign, so see which one has more digits.  Note
     that, if they are negative, the longer number is the lesser.  */
  ylen = SCM_NUMDIGS (y);
  xlen = SCM_NUMDIGS (x);
  if (ylen > xlen)
    return (xsign) ? -1 : 1;
  if (ylen < xlen)
    return (xsign) ? 1 : -1;

  /* They have the same number of digits, so find the most significant
     digit where they differ.  */
  while (xlen)
    {
      --xlen;
      if (SCM_BDIGITS (y)[xlen] != SCM_BDIGITS (x)[xlen])
	/* Make the discrimination based on the digit that differs.  */
	return ((SCM_BDIGITS (y)[xlen] > SCM_BDIGITS (x)[xlen])
		? (xsign ? -1 :  1)
		: (xsign ?  1 : -1));
    }

  /* The numbers are identical.  */
  return 0;
}

#ifndef SCM_DIGSTOOBIG


long
scm_pseudolong (long x)
{
  union
  {
    long l;
    SCM_BIGDIG bd[SCM_DIGSPERLONG];
  }
  p;
  scm_sizet i = 0;
  if (x < 0)
    x = -x;
  while (i < SCM_DIGSPERLONG)
    {
      p.bd[i++] = SCM_BIGLO (x);
      x = SCM_BIGDN (x);
    }
  /*  p.bd[0] = SCM_BIGLO(x); p.bd[1] = SCM_BIGDN(x); */
  return p.l;
}

#else


void
scm_longdigs (long x, SCM_BIGDIG digs[])
{
  scm_sizet i = 0;
  if (x < 0)
    x = -x;
  while (i < SCM_DIGSPERLONG)
    {
      digs[i++] = SCM_BIGLO (x);
      x = SCM_BIGDN (x);
    }
}
#endif



SCM
scm_addbig (SCM_BIGDIG *x, scm_sizet nx, int xsgn, SCM bigy, int sgny)
{
  /* Assumes nx <= SCM_NUMDIGS(bigy) */
  /* Assumes xsgn and sgny scm_equal either 0 or SCM_BIGSIGNFLAG */
  long num = 0;
  scm_sizet i = 0, ny = SCM_NUMDIGS (bigy);
  SCM z = scm_copybig (bigy, SCM_BIGSIGN (bigy) ^ sgny);
  SCM_BIGDIG *zds = SCM_BDIGITS (z);
  if (xsgn ^ SCM_BIGSIGN (z))
    {
      do
	{
	  num += (long) zds[i] - x[i];
	  if (num < 0)
	    {
	      zds[i] = num + SCM_BIGRAD;
	      num = -1;
	    }
	  else
	    {
	      zds[i] = SCM_BIGLO (num);
	      num = 0;
	    }
	}
      while (++i < nx);
      if (num && nx == ny)
	{
	  num = 1;
	  i = 0;
	  SCM_SET_CELL_WORD_0 (z, SCM_CELL_WORD_0 (z) ^ SCM_BIGSIGNFLAG);
	  do
	    {
	      num += (SCM_BIGRAD - 1) - zds[i];
	      zds[i++] = SCM_BIGLO (num);
	      num = SCM_BIGDN (num);
	    }
	  while (i < ny);
	}
      else
	while (i < ny)
	  {
	    num += zds[i];
	    if (num < 0)
	      {
		zds[i++] = num + SCM_BIGRAD;
		num = -1;
	      }
	    else
	      {
		zds[i++] = SCM_BIGLO (num);
		num = 0;
	      }
	  }
    }
  else
    {
      do
	{
	  num += (long) zds[i] + x[i];
	  zds[i++] = SCM_BIGLO (num);
	  num = SCM_BIGDN (num);
	}
      while (i < nx);
      if (!num)
	return z;
      while (i < ny)
	{
	  num += zds[i];
	  zds[i++] = SCM_BIGLO (num);
	  num = SCM_BIGDN (num);
	  if (!num)
	    return z;
	}
      if (num)
	{
	  z = scm_adjbig (z, ny + 1);
	  SCM_BDIGITS (z)[ny] = num;
	  return z;
	}
    }
  return scm_normbig (z);
}


SCM
scm_mulbig (SCM_BIGDIG *x, scm_sizet nx, SCM_BIGDIG *y, scm_sizet ny, int sgn)
{
  scm_sizet i = 0, j = nx + ny;
  unsigned long n = 0;
  SCM z = scm_mkbig (j, sgn);
  SCM_BIGDIG *zds = SCM_BDIGITS (z);
  while (j--)
    zds[j] = 0;
  do
    {
      j = 0;
      if (x[i])
	{
	  do
	    {
	      n += zds[i + j] + ((unsigned long) x[i] * y[j]);
	      zds[i + j++] = SCM_BIGLO (n);
	      n = SCM_BIGDN (n);
	    }
	  while (j < ny);
	  if (n)
	    {
	      zds[i + j] = n;
	      n = 0;
	    }
	}
    }
  while (++i < nx);
  return scm_normbig (z);
}


/* Sun's compiler complains about the fact that this function has an
   ANSI prototype in numbers.h, but a K&R declaration here, and the
   two specify different promotions for the third argument.  I'm going
   to turn this into an ANSI declaration, and see if anyone complains
   about it not being K&R.  */

unsigned int
scm_divbigdig (SCM_BIGDIG * ds,
	       scm_sizet h,
	       SCM_BIGDIG div)
{
  register unsigned long t2 = 0;
  while (h--)
    {
      t2 = SCM_BIGUP (t2) + ds[h];
      ds[h] = t2 / div;
      t2 %= div;
    }
  return t2;
}



SCM
scm_divbigint (SCM x, long z, int sgn, int mode)
{
  if (z < 0)
    z = -z;
  if (z < SCM_BIGRAD)
    {
      register unsigned long t2 = 0;
      register SCM_BIGDIG *ds = SCM_BDIGITS (x);
      scm_sizet nd = SCM_NUMDIGS (x);
      while (nd--)
	t2 = (SCM_BIGUP (t2) + ds[nd]) % z;
      if (mode && t2)
	t2 = z - t2;
      return SCM_MAKINUM (sgn ? -t2 : t2);
    }
  {
#ifndef SCM_DIGSTOOBIG
    unsigned long t2 = scm_pseudolong (z);
    return scm_divbigbig (SCM_BDIGITS (x), SCM_NUMDIGS (x),
			  (SCM_BIGDIG *) & t2, SCM_DIGSPERLONG,
			  sgn, mode);
#else
    SCM_BIGDIG t2[SCM_DIGSPERLONG];
    scm_longdigs (z, t2);
    return scm_divbigbig (SCM_BDIGITS (x), SCM_NUMDIGS (x),
			  t2, SCM_DIGSPERLONG,
			  sgn, mode);
#endif
  }
}


SCM
scm_divbigbig (SCM_BIGDIG *x, scm_sizet nx, SCM_BIGDIG *y, scm_sizet ny, int sgn, int modes)
{
  /* modes description
     0  remainder
     1  scm_modulo
     2  quotient
     3  quotient but returns 0 if division is not exact. */
  scm_sizet i = 0, j = 0;
  long num = 0;
  unsigned long t2 = 0;
  SCM z, newy;
  SCM_BIGDIG d = 0, qhat, *zds, *yds;
  /* algorithm requires nx >= ny */
  if (nx < ny)
    switch (modes)
      {
      case 0:			/* remainder -- just return x */
	z = scm_mkbig (nx, sgn);
	zds = SCM_BDIGITS (z);
	do
	  {
	    zds[i] = x[i];
	  }
	while (++i < nx);
	return z;
      case 1:			/* scm_modulo -- return y-x */
	z = scm_mkbig (ny, sgn);
	zds = SCM_BDIGITS (z);
	do
	  {
	    num += (long) y[i] - x[i];
	    if (num < 0)
	      {
		zds[i] = num + SCM_BIGRAD;
		num = -1;
	      }
	    else
	      {
		zds[i] = num;
		num = 0;
	      }
	  }
	while (++i < nx);
	while (i < ny)
	  {
	    num += y[i];
	    if (num < 0)
	      {
		zds[i++] = num + SCM_BIGRAD;
		num = -1;
	      }
	    else
	      {
		zds[i++] = num;
		num = 0;
	      }
	  }
	goto doadj;
      case 2:
	return SCM_INUM0;	/* quotient is zero */
      case 3:
	return 0;		/* the division is not exact */
      }

  z = scm_mkbig (nx == ny ? nx + 2 : nx + 1, sgn);
  zds = SCM_BDIGITS (z);
  if (nx == ny)
    zds[nx + 1] = 0;
  while (!y[ny - 1])
    ny--;			/* in case y came in as a psuedolong */
  if (y[ny - 1] < (SCM_BIGRAD >> 1))
    {				/* normalize operands */
      d = SCM_BIGRAD / (y[ny - 1] + 1);
      newy = scm_mkbig (ny, 0);
      yds = SCM_BDIGITS (newy);
      while (j < ny)
	{
	  t2 += (unsigned long) y[j] * d;
	  yds[j++] = SCM_BIGLO (t2);
	  t2 = SCM_BIGDN (t2);
	}
      y = yds;
      j = 0;
      t2 = 0;
      while (j < nx)
	{
	  t2 += (unsigned long) x[j] * d;
	  zds[j++] = SCM_BIGLO (t2);
	  t2 = SCM_BIGDN (t2);
	}
      zds[j] = t2;
    }
  else
    {
      zds[j = nx] = 0;
      while (j--)
	zds[j] = x[j];
    }
  j = nx == ny ? nx + 1 : nx;	/* dividend needs more digits than divisor */
  do
    {				/* loop over digits of quotient */
      if (zds[j] == y[ny - 1])
	qhat = SCM_BIGRAD - 1;
      else
	qhat = (SCM_BIGUP (zds[j]) + zds[j - 1]) / y[ny - 1];
      if (!qhat)
	continue;
      i = 0;
      num = 0;
      t2 = 0;
      do
	{			/* multiply and subtract */
	  t2 += (unsigned long) y[i] * qhat;
	  num += zds[j - ny + i] - SCM_BIGLO (t2);
	  if (num < 0)
	    {
	      zds[j - ny + i] = num + SCM_BIGRAD;
	      num = -1;
	    }
	  else
	    {
	      zds[j - ny + i] = num;
	      num = 0;
	    }
	  t2 = SCM_BIGDN (t2);
	}
      while (++i < ny);
      num += zds[j - ny + i] - t2; /* borrow from high digit; don't update */
      while (num)
	{			/* "add back" required */
	  i = 0;
	  num = 0;
	  qhat--;
	  do
	    {
	      num += (long) zds[j - ny + i] + y[i];
	      zds[j - ny + i] = SCM_BIGLO (num);
	      num = SCM_BIGDN (num);
	    }
	  while (++i < ny);
	  num--;
	}
      if (modes & 2)
	zds[j] = qhat;
    }
  while (--j >= ny);
  switch (modes)
    {
    case 3:			/* check that remainder==0 */
      for (j = ny; j && !zds[j - 1]; --j);
      if (j)
	return 0;
    case 2:			/* move quotient down in z */
      j = (nx == ny ? nx + 2 : nx + 1) - ny;
      for (i = 0; i < j; i++)
	zds[i] = zds[i + ny];
      ny = i;
      break;
    case 1:			/* subtract for scm_modulo */
      i = 0;
      num = 0;
      j = 0;
      do
	{
	  num += y[i] - zds[i];
	  j = j | zds[i];
	  if (num < 0)
	    {
	      zds[i] = num + SCM_BIGRAD;
	      num = -1;
	    }
	  else
	    {
	      zds[i] = num;
	      num = 0;
	    }
	}
      while (++i < ny);
      if (!j)
	return SCM_INUM0;
    case 0:			/* just normalize remainder */
      if (d)
	scm_divbigdig (zds, ny, d);
    }
 doadj:
  for (j = ny; j && !zds[j - 1]; --j);
  if (j * SCM_BITSPERDIG <= sizeof (SCM) * SCM_CHAR_BIT)
    if (SCM_INUMP (z = scm_big2inum (z, j)))
      return z;
  return scm_adjbig (z, j);
}
#endif
\f




/*** NUMBERS -> STRINGS ***/
int scm_dblprec;
static const double fx[] =
{  0.0,  5e-1,  5e-2,  5e-3,   5e-4, 5e-5,
  5e-6,  5e-7,  5e-8,  5e-9,  5e-10,
 5e-11, 5e-12, 5e-13, 5e-14,  5e-15,
 5e-16, 5e-17, 5e-18, 5e-19,  5e-20};




static scm_sizet
idbl2str (double f, char *a)
{
  int efmt, dpt, d, i, wp = scm_dblprec;
  scm_sizet ch = 0;
  int exp = 0;

  if (f == 0.0)
    goto zero;			/*{a[0]='0'; a[1]='.'; a[2]='0'; return 3;} */
  if (f < 0.0)
    {
      f = -f;
      a[ch++] = '-';
    }
  else if (f > 0.0);
  else
    goto funny;
  if (IS_INF (f))
    {
      if (ch == 0)
	a[ch++] = '+';
    funny:
      a[ch++] = '#';
      a[ch++] = '.';
      a[ch++] = '#';
      return ch;
    }
#ifdef DBL_MIN_10_EXP  /* Prevent unnormalized values, as from 
			  make-uniform-vector, from causing infinite loops. */
  while (f < 1.0)
    {
      f *= 10.0;
      if (exp-- < DBL_MIN_10_EXP)
	goto funny;
    }
  while (f > 10.0)
    {
      f *= 0.10;
      if (exp++ > DBL_MAX_10_EXP)
	goto funny;
    }
#else
  while (f < 1.0)
    {
      f *= 10.0;
      exp--;
    }
  while (f > 10.0)
    {
      f /= 10.0;
      exp++;
    }
#endif
  if (f + fx[wp] >= 10.0)
    {
      f = 1.0;
      exp++;
    }
 zero:
#ifdef ENGNOT
  dpt = (exp + 9999) % 3;
  exp -= dpt++;
  efmt = 1;
#else
  efmt = (exp < -3) || (exp > wp + 2);
  if (!efmt)
    {
      if (exp < 0)
	{
	  a[ch++] = '0';
	  a[ch++] = '.';
	  dpt = exp;
	  while (++dpt)
	    a[ch++] = '0';
	}
      else
	dpt = exp + 1;
    }
  else
    dpt = 1;
#endif

  do
    {
      d = f;
      f -= d;
      a[ch++] = d + '0';
      if (f < fx[wp])
	break;
      if (f + fx[wp] >= 1.0)
	{
	  a[ch - 1]++;
	  break;
	}
      f *= 10.0;
      if (!(--dpt))
	a[ch++] = '.';
    }
  while (wp--);

  if (dpt > 0)
    {
#ifndef ENGNOT
      if ((dpt > 4) && (exp > 6))
	{
	  d = (a[0] == '-' ? 2 : 1);
	  for (i = ch++; i > d; i--)
	    a[i] = a[i - 1];
	  a[d] = '.';
	  efmt = 1;
	}
      else
#endif
	{
	  while (--dpt)
	    a[ch++] = '0';
	  a[ch++] = '.';
	}
    }
  if (a[ch - 1] == '.')
    a[ch++] = '0';		/* trailing zero */
  if (efmt && exp)
    {
      a[ch++] = 'e';
      if (exp < 0)
	{
	  exp = -exp;
	  a[ch++] = '-';
	}
      for (i = 10; i <= exp; i *= 10);
      for (i /= 10; i; i /= 10)
	{
	  a[ch++] = exp / i + '0';
	  exp %= i;
	}
    }
  return ch;
}


static scm_sizet
iflo2str (SCM flt, char *str)
{
  scm_sizet i;
  if (SCM_SLOPPY_REALP (flt))
    i = idbl2str (SCM_REAL_VALUE (flt), str);
  else
    {
      i = idbl2str (SCM_COMPLEX_REAL (flt), str);
      if (SCM_COMPLEX_IMAG (flt) != 0.0)
	{
	  if (0 <= SCM_COMPLEX_IMAG (flt))
	    str[i++] = '+';
	  i += idbl2str (SCM_COMPLEX_IMAG (flt), &str[i]);
	  str[i++] = 'i';
	}
    }
  return i;
}

/* convert a long to a string (unterminated).  returns the number of
   characters in the result. 
   rad is output base
   p is destination: worst case (base 2) is SCM_INTBUFLEN  */
scm_sizet
scm_iint2str (long num, int rad, char *p)
{
  scm_sizet j = 1;
  scm_sizet i;
  unsigned long n = (num < 0) ? -num : num;

  for (n /= rad; n > 0; n /= rad)
    j++;

  i = j;
  if (num < 0)
    {
      *p++ = '-';
      j++;
      n = -num;
    }
  else
    n = num;
  while (i--)
    {
      int d = n % rad;

      n /= rad;
      p[i] = d + ((d < 10) ? '0' : 'a' - 10);
    }
  return j;
}


#ifdef SCM_BIGDIG

static SCM
big2str (SCM b, unsigned int radix)
{
  SCM t = scm_copybig (b, 0);	/* sign of temp doesn't matter */
  register SCM_BIGDIG *ds = SCM_BDIGITS (t);
  scm_sizet i = SCM_NUMDIGS (t);
  scm_sizet j = radix == 16 ? (SCM_BITSPERDIG * i) / 4 + 2
    : radix >= 10 ? (SCM_BITSPERDIG * i * 241L) / 800 + 2
    : (SCM_BITSPERDIG * i) + 2;
  scm_sizet k = 0;
  scm_sizet radct = 0;
  scm_sizet ch;			/* jeh */
  SCM_BIGDIG radpow = 1, radmod = 0;
  SCM ss = scm_makstr ((long) j, 0);
  char *s = SCM_CHARS (ss), c;
  while ((long) radpow * radix < SCM_BIGRAD)
    {
      radpow *= radix;
      radct++;
    }
  s[0] = SCM_BIGSIGN (b) ? '-' : '+';
  while ((i || radmod) && j)
    {
      if (k == 0)
	{
	  radmod = (SCM_BIGDIG) scm_divbigdig (ds, i, radpow);
	  k = radct;
	  if (!ds[i - 1])
	    i--;
	}
      c = radmod % radix;
      radmod /= radix;
      k--;
      s[--j] = c < 10 ? c + '0' : c + 'a' - 10;
    }
  ch = s[0] == '-' ? 1 : 0;	/* jeh */
  if (ch < j)
    {				/* jeh */
      for (i = j; j < SCM_LENGTH (ss); j++)
	s[ch + j - i] = s[j];	/* jeh */
      scm_vector_set_length_x (ss, /* jeh */
			       SCM_MAKINUM (ch + SCM_LENGTH (ss) - i));
    }

  return scm_return_first (ss, t);
}
#endif


SCM_DEFINE (scm_number_to_string, "number->string", 1, 1, 0,
            (SCM x, SCM radix),
	    "")
#define FUNC_NAME s_scm_number_to_string
{
  int base;
  SCM_VALIDATE_INUM_MIN_DEF_COPY (2,radix,2,10,base);
  if (SCM_NINUMP (x))
    {
      char num_buf[SCM_FLOBUFLEN];
#ifdef SCM_BIGDIG
      SCM_ASRTGO (SCM_NIMP (x), badx);
      if (SCM_BIGP (x))
	return big2str (x, (unsigned int) base);
#ifndef SCM_RECKLESS
      if (!SCM_SLOPPY_INEXACTP (x))
	{
	badx:
	  SCM_WTA (1, x);
	}
#endif
#else
      SCM_ASSERT (SCM_SLOPPY_INEXACTP (x),
		  x, SCM_ARG1, s_number_to_string);
#endif
      return scm_makfromstr (num_buf, iflo2str (x, num_buf), 0);
    }
  {
    char num_buf[SCM_INTBUFLEN];
    return scm_makfromstr (num_buf,
			   scm_iint2str (SCM_INUM (x),
					 base,
					 num_buf),
			   0);
  }
}
#undef FUNC_NAME


/* These print routines are stubbed here so that scm_repl.c doesn't need
   SCM_BIGDIG conditionals */

int
scm_print_real (SCM sexp, SCM port, scm_print_state *pstate)
{
  char num_buf[SCM_FLOBUFLEN];
  scm_lfwrite (num_buf, iflo2str (sexp, num_buf), port);
  return !0;
}

int
scm_print_complex (SCM sexp, SCM port, scm_print_state *pstate)
{
  char num_buf[SCM_FLOBUFLEN];
  scm_lfwrite (num_buf, iflo2str (sexp, num_buf), port);
  return !0;
}

int
scm_bigprint (SCM exp, SCM port, scm_print_state *pstate)
{
#ifdef SCM_BIGDIG
  exp = big2str (exp, (unsigned int) 10);
  scm_lfwrite (SCM_CHARS (exp), (scm_sizet) SCM_LENGTH (exp), port);
#else
  scm_ipruk ("bignum", exp, port);
#endif
  return !0;
}
/*** END nums->strs ***/

/*** STRINGS -> NUMBERS ***/

static SCM
scm_small_istr2int (char *str, long len, long radix)
{
  register long n = 0, ln;
  register int c;
  register int i = 0;
  int lead_neg = 0;
  if (0 >= len)
    return SCM_BOOL_F;		/* zero scm_length */
  switch (*str)
    {				/* leading sign */
    case '-':
      lead_neg = 1;
    case '+':
      if (++i == len)
	return SCM_BOOL_F;	/* bad if lone `+' or `-' */
    }

  do
    {
      switch (c = str[i++])
	{
	case DIGITS:
	  c = c - '0';
	  goto accumulate;
	case 'A':
	case 'B':
	case 'C':
	case 'D':
	case 'E':
	case 'F':
	  c = c - 'A' + 10;
	  goto accumulate;
	case 'a':
	case 'b':
	case 'c':
	case 'd':
	case 'e':
	case 'f':
	  c = c - 'a' + 10;
	accumulate:
	  if (c >= radix)
	    return SCM_BOOL_F;	/* bad digit for radix */
	  ln = n;
	  n = n * radix - c;
	  /* Negation is a workaround for HP700 cc bug */
	  if (n > ln || (-n > -SCM_MOST_NEGATIVE_FIXNUM))
	    goto ovfl;
	  break;
	default:
	  return SCM_BOOL_F;	/* not a digit */
	}
    }
  while (i < len);
  if (!lead_neg)
    if ((n = -n) > SCM_MOST_POSITIVE_FIXNUM)
      goto ovfl;
  return SCM_MAKINUM (n);
 ovfl:				/* overflow scheme integer */
  return SCM_BOOL_F;
}



SCM
scm_istr2int (char *str, long len, long radix)
{
  scm_sizet j;
  register scm_sizet k, blen = 1;
  scm_sizet i = 0;
  int c;
  SCM res;
  register SCM_BIGDIG *ds;
  register unsigned long t2;

  if (0 >= len)
    return SCM_BOOL_F;		/* zero scm_length */

  /* Short numbers we parse directly into an int, to avoid the overhead 
     of creating a bignum.  */
  if (len < 6)
    return scm_small_istr2int (str, len, radix);

  if (16 == radix)
    j = 1 + (4 * len * sizeof (char)) / (SCM_BITSPERDIG);
  else if (10 <= radix)
    j = 1 + (84 * len * sizeof (char)) / (SCM_BITSPERDIG * 25);
  else
    j = 1 + (len * sizeof (char)) / (SCM_BITSPERDIG);
  switch (str[0])
    {				/* leading sign */
    case '-':
    case '+':
      if (++i == (unsigned) len)
	return SCM_BOOL_F;	/* bad if lone `+' or `-' */
    }
  res = scm_mkbig (j, '-' == str[0]);
  ds = SCM_BDIGITS (res);
  for (k = j; k--;)
    ds[k] = 0;
  do
    {
      switch (c = str[i++])
	{
	case DIGITS:
	  c = c - '0';
	  goto accumulate;
	case 'A':
	case 'B':
	case 'C':
	case 'D':
	case 'E':
	case 'F':
	  c = c - 'A' + 10;
	  goto accumulate;
	case 'a':
	case 'b':
	case 'c':
	case 'd':
	case 'e':
	case 'f':
	  c = c - 'a' + 10;
	accumulate:
	  if (c >= radix)
	    return SCM_BOOL_F;	/* bad digit for radix */
	  k = 0;
	  t2 = c;
	moretodo:
	  while (k < blen)
	    {
/* printf ("k = %d, blen = %d, t2 = %ld, ds[k] = %d\n", k, blen, t2, ds[k]); */
	      t2 += ds[k] * radix;
	      ds[k++] = SCM_BIGLO (t2);
	      t2 = SCM_BIGDN (t2);
	    }
	  if (blen > j)
	    scm_num_overflow ("bignum");
	  if (t2)
	    {
	      blen++;
	      goto moretodo;
	    }
	  break;
	default:
	  return SCM_BOOL_F;	/* not a digit */
	}
    }
  while (i < (unsigned) len);
  if (blen * SCM_BITSPERDIG / SCM_CHAR_BIT <= sizeof (SCM))
    if (SCM_INUMP (res = scm_big2inum (res, blen)))
      return res;
  if (j == blen)
    return res;
  return scm_adjbig (res, blen);
}

SCM
scm_istr2flo (char *str, long len, long radix)
{
  register int c, i = 0;
  double lead_sgn;
  double res = 0.0, tmp = 0.0;
  int flg = 0;
  int point = 0;
  SCM second;

  if (i >= len)
    return SCM_BOOL_F;		/* zero scm_length */

  switch (*str)
    {				/* leading sign */
    case '-':
      lead_sgn = -1.0;
      i++;
      break;
    case '+':
      lead_sgn = 1.0;
      i++;
      break;
    default:
      lead_sgn = 0.0;
    }
  if (i == len)
    return SCM_BOOL_F;		/* bad if lone `+' or `-' */

  if (str[i] == 'i' || str[i] == 'I')
    {				/* handle `+i' and `-i'   */
      if (lead_sgn == 0.0)
	return SCM_BOOL_F;	/* must have leading sign */
      if (++i < len)
	return SCM_BOOL_F;	/* `i' not last character */
      return scm_makdbl (0.0, lead_sgn);
    }
  do
    {				/* check initial digits */
      switch (c = str[i])
	{
	case DIGITS:
	  c = c - '0';
	  goto accum1;
	case 'D':
	case 'E':
	case 'F':
	  if (radix == 10)
	    goto out1;		/* must be exponent */
	case 'A':
	case 'B':
	case 'C':
	  c = c - 'A' + 10;
	  goto accum1;
	case 'd':
	case 'e':
	case 'f':
	  if (radix == 10)
	    goto out1;
	case 'a':
	case 'b':
	case 'c':
	  c = c - 'a' + 10;
	accum1:
	  if (c >= radix)
	    return SCM_BOOL_F;	/* bad digit for radix */
	  res = res * radix + c;
	  flg = 1;		/* res is valid */
	  break;
	default:
	  goto out1;
	}
    }
  while (++i < len);
 out1:

  /* if true, then we did see a digit above, and res is valid */
  if (i == len)
    goto done;

  /* By here, must have seen a digit,
     or must have next char be a `.' with radix==10 */
  if (!flg)
    if (!(str[i] == '.' && radix == 10))
      return SCM_BOOL_F;

  while (str[i] == '#')
    {				/* optional sharps */
      res *= radix;
      if (++i == len)
	goto done;
    }

  if (str[i] == '/')
    {
      while (++i < len)
	{
	  switch (c = str[i])
	    {
	    case DIGITS:
	      c = c - '0';
	      goto accum2;
	    case 'A':
	    case 'B':
	    case 'C':
	    case 'D':
	    case 'E':
	    case 'F':
	      c = c - 'A' + 10;
	      goto accum2;
	    case 'a':
	    case 'b':
	    case 'c':
	    case 'd':
	    case 'e':
	    case 'f':
	      c = c - 'a' + 10;
	    accum2:
	      if (c >= radix)
		return SCM_BOOL_F;
	      tmp = tmp * radix + c;
	      break;
	    default:
	      goto out2;
	    }
	}
    out2:
      if (tmp == 0.0)
	return SCM_BOOL_F;	/* `slash zero' not allowed */
      if (i < len)
	while (str[i] == '#')
	  {			/* optional sharps */
	    tmp *= radix;
	    if (++i == len)
	      break;
	  }
      res /= tmp;
      goto done;
    }

  if (str[i] == '.')
    {				/* decimal point notation */
      if (radix != 10)
	return SCM_BOOL_F;	/* must be radix 10 */
      while (++i < len)
	{
	  switch (c = str[i])
	    {
	    case DIGITS:
	      point--;
	      res = res * 10.0 + c - '0';
	      flg = 1;
	      break;
	    default:
	      goto out3;
	    }
	}
    out3:
      if (!flg)
	return SCM_BOOL_F;	/* no digits before or after decimal point */
      if (i == len)
	goto adjust;
      while (str[i] == '#')
	{			/* ignore remaining sharps */
	  if (++i == len)
	    goto adjust;
	}
    }

  switch (str[i])
    {				/* exponent */
    case 'd':
    case 'D':
    case 'e':
    case 'E':
    case 'f':
    case 'F':
    case 'l':
    case 'L':
    case 's':
    case 'S':
      {
	int expsgn = 1, expon = 0;
	if (radix != 10)
	  return SCM_BOOL_F;	/* only in radix 10 */
	if (++i == len)
	  return SCM_BOOL_F;	/* bad exponent */
	switch (str[i])
	  {
	  case '-':
	    expsgn = (-1);
	  case '+':
	    if (++i == len)
	      return SCM_BOOL_F;	/* bad exponent */
	  }
	if (str[i] < '0' || str[i] > '9')
	  return SCM_BOOL_F;	/* bad exponent */
	do
	  {
	    switch (c = str[i])
	      {
	      case DIGITS:
		expon = expon * 10 + c - '0';
		if (expon > SCM_MAXEXP)
		  return SCM_BOOL_F;	/* exponent too large */
		break;
	      default:
		goto out4;
	      }
	  }
	while (++i < len);
      out4:
	point += expsgn * expon;
      }
    }

 adjust:
  if (point >= 0)
    while (point--)
      res *= 10.0;
  else
#ifdef _UNICOS
    while (point++)
      res *= 0.1;
#else
  while (point++)
    res /= 10.0;
#endif

 done:
  /* at this point, we have a legitimate floating point result */
  if (lead_sgn == -1.0)
    res = -res;
  if (i == len)
    return scm_makdbl (res, 0.0);

  if (str[i] == 'i' || str[i] == 'I')
    {				/* pure imaginary number  */
      if (lead_sgn == 0.0)
	return SCM_BOOL_F;	/* must have leading sign */
      if (++i < len)
	return SCM_BOOL_F;	/* `i' not last character */
      return scm_makdbl (0.0, res);
    }

  switch (str[i++])
    {
    case '-':
      lead_sgn = -1.0;
      break;
    case '+':
      lead_sgn = 1.0;
      break;
    case '@':
      {				/* polar input for complex number */
	/* get a `real' for scm_angle */
	second = scm_istr2flo (&str[i], (long) (len - i), radix);
	if (!SCM_SLOPPY_INEXACTP (second))
	  return SCM_BOOL_F;	/* not `real' */
	if (SCM_SLOPPY_COMPLEXP (second))
	  return SCM_BOOL_F;	/* not `real' */
	tmp = SCM_REALPART (second);
	return scm_makdbl (res * cos (tmp), res * sin (tmp));
      }
    default:
      return SCM_BOOL_F;
    }

  /* at this point, last char must be `i' */
  if (str[len - 1] != 'i' && str[len - 1] != 'I')
    return SCM_BOOL_F;
  /* handles `x+i' and `x-i' */
  if (i == (len - 1))
    return scm_makdbl (res, lead_sgn);
  /* get a `ureal' for complex part */
  second = scm_istr2flo (&str[i], (long) ((len - i) - 1), radix);
  if (!SCM_INEXACTP (second))
    return SCM_BOOL_F;		/* not `ureal' */
  if (SCM_SLOPPY_COMPLEXP (second))
    return SCM_BOOL_F;		/* not `ureal' */
  tmp = SCM_REALPART (second);
  if (tmp < 0.0)
    return SCM_BOOL_F;		/* not `ureal' */
  return scm_makdbl (res, (lead_sgn * tmp));
}



SCM
scm_istring2number (char *str, long len, long radix)
{
  int i = 0;
  char ex = 0;
  char ex_p = 0, rx_p = 0;	/* Only allow 1 exactness and 1 radix prefix */
  SCM res;
  if (len == 1)
    if (*str == '+' || *str == '-')    /* Catches lone `+' and `-' for speed */
      return SCM_BOOL_F;

  while ((len - i) >= 2 && str[i] == '#' && ++i)
    switch (str[i++])
      {
      case 'b':
      case 'B':
	if (rx_p++)
	  return SCM_BOOL_F;
	radix = 2;
	break;
      case 'o':
      case 'O':
	if (rx_p++)
	  return SCM_BOOL_F;
	radix = 8;
	break;
      case 'd':
      case 'D':
	if (rx_p++)
	  return SCM_BOOL_F;
	radix = 10;
	break;
      case 'x':
      case 'X':
	if (rx_p++)
	  return SCM_BOOL_F;
	radix = 16;
	break;
      case 'i':
      case 'I':
	if (ex_p++)
	  return SCM_BOOL_F;
	ex = 2;
	break;
      case 'e':
      case 'E':
	if (ex_p++)
	  return SCM_BOOL_F;
	ex = 1;
	break;
      default:
	return SCM_BOOL_F;
      }

  switch (ex)
    {
    case 1:
      return scm_istr2int (&str[i], len - i, radix);
    case 0:
      res = scm_istr2int (&str[i], len - i, radix);
      if (SCM_NFALSEP (res))
	return res;
    case 2:
      return scm_istr2flo (&str[i], len - i, radix);
    }
  return SCM_BOOL_F;
}


SCM_DEFINE (scm_string_to_number, "string->number", 1, 1, 0,
            (SCM str, SCM radix),
	    "")
#define FUNC_NAME s_scm_string_to_number
{
  SCM answer;
  int base;
  SCM_VALIDATE_ROSTRING (1,str);
  SCM_VALIDATE_INUM_MIN_DEF_COPY (2,radix,2,10,base);
  answer = scm_istring2number (SCM_ROCHARS (str),
			       SCM_ROLENGTH (str),
                               base);
  return scm_return_first (answer, str);
}
#undef FUNC_NAME
/*** END strs->nums ***/

SCM
scm_make_real (double x)
{
  SCM z;
  SCM_NEWREAL (z, x);
  return z;
}

SCM
scm_make_complex (double x, double y)
{
  SCM z;
  SCM_NEWCOMPLEX (z, x, y);
  return z;
}

SCM
scm_bigequal (SCM x, SCM y)
{
#ifdef SCM_BIGDIG
  if (0 == scm_bigcomp (x, y))
    return SCM_BOOL_T;
#endif
  return SCM_BOOL_F;
}

SCM
scm_real_equalp (SCM x, SCM y)
{
  return SCM_BOOL (SCM_REAL_VALUE (x) == SCM_REAL_VALUE (y));
}

SCM
scm_complex_equalp (SCM x, SCM y)
{
  return SCM_BOOL (SCM_COMPLEX_REAL (x) == SCM_COMPLEX_REAL (y)
		   && SCM_COMPLEX_IMAG (x) == SCM_COMPLEX_IMAG (y));
}



SCM_REGISTER_PROC (s_number_p, "number?", 1, 0, 0, scm_number_p);

SCM_DEFINE (scm_number_p, "complex?", 1, 0, 0, 
            (SCM x),
	    "")
#define FUNC_NAME s_scm_number_p
{
  if (SCM_INUMP (x))
    return SCM_BOOL_T;
  if (SCM_NUMP (x))
    return SCM_BOOL_T;
  return SCM_BOOL_F;
}
#undef FUNC_NAME



SCM_REGISTER_PROC (s_real_p, "real?", 1, 0, 0, scm_real_p);


SCM_DEFINE (scm_real_p, "rational?", 1, 0, 0, 
            (SCM x),
	    "")
#define FUNC_NAME s_scm_real_p
{
  if (SCM_INUMP (x))
    return SCM_BOOL_T;
  if (SCM_IMP (x))
    return SCM_BOOL_F;
  if (SCM_SLOPPY_REALP (x))
    return SCM_BOOL_T;
#ifdef SCM_BIGDIG
  if (SCM_BIGP (x))
    return SCM_BOOL_T;
#endif
  return SCM_BOOL_F;
}
#undef FUNC_NAME



SCM_DEFINE (scm_integer_p, "integer?", 1, 0, 0, 
            (SCM x),
	    "")
#define FUNC_NAME s_scm_integer_p
{
  double r;
  if (SCM_INUMP (x))
    return SCM_BOOL_T;
  if (SCM_IMP (x))
    return SCM_BOOL_F;
#ifdef SCM_BIGDIG
  if (SCM_BIGP (x))
    return SCM_BOOL_T;
#endif
  if (!SCM_SLOPPY_INEXACTP (x))
    return SCM_BOOL_F;
  if (SCM_SLOPPY_COMPLEXP (x))
    return SCM_BOOL_F;
  r = SCM_REALPART (x);
  if (r == floor (r))
    return SCM_BOOL_T;
  return SCM_BOOL_F;
}
#undef FUNC_NAME



SCM_DEFINE (scm_inexact_p, "inexact?", 1, 0, 0, 
            (SCM x),
	    "")
#define FUNC_NAME s_scm_inexact_p
{
  if (SCM_INEXACTP (x))
    return SCM_BOOL_T;
  return SCM_BOOL_F;
}
#undef FUNC_NAME




SCM_GPROC1 (s_eq_p, "=", scm_tc7_rpsubr, scm_num_eq_p, g_eq_p);

SCM
scm_num_eq_p (SCM x, SCM y)
{
  SCM t;
  if (SCM_NINUMP (x))
    {
#ifdef SCM_BIGDIG
      if (!SCM_NIMP (x))
	{
	badx:
	  SCM_WTA_DISPATCH_2 (g_eq_p, x, y, SCM_ARG1, s_eq_p);
	}
      if (SCM_BIGP (x))
	{
	  if (SCM_INUMP (y))
	    return SCM_BOOL_F;
	  SCM_ASRTGO (SCM_NIMP (y), bady);
	  if (SCM_BIGP (y))
	    return SCM_BOOL(0 == scm_bigcomp (x, y));
	  SCM_ASRTGO (SCM_SLOPPY_INEXACTP (y), bady);
	bigreal:
	  return ((SCM_SLOPPY_REALP (y) && (scm_big2dbl (x) == SCM_REALPART (y)))
		  ? SCM_BOOL_T
		  : SCM_BOOL_F);
	}
      SCM_ASRTGO (SCM_SLOPPY_INEXACTP (x), badx);
#else
      SCM_GASSERT2 (SCM_SLOPPY_INEXACTP (x),
		    g_eq_p, x, y, SCM_ARG1, s_eq_p);
#endif
      if (SCM_INUMP (y))
	{
	  t = x;
	  x = y;
	  y = t;
	  goto realint;
	}
#ifdef SCM_BIGDIG
      SCM_ASRTGO (SCM_NIMP (y), bady);
      if (SCM_BIGP (y))
	{
	  t = x;
	  x = y;
	  y = t;
	  goto bigreal;
	}
      SCM_ASRTGO (SCM_SLOPPY_INEXACTP (y), bady);
#else
      SCM_ASRTGO (SCM_SLOPPY_INEXACTP (y), bady);
#endif
      if (SCM_SLOPPY_REALP (x))
	{
	  if (SCM_SLOPPY_REALP (y))
	    return SCM_BOOL (SCM_REAL_VALUE (x) == SCM_REAL_VALUE (y));
	  else
	    return SCM_BOOL (SCM_REAL_VALUE (x) == SCM_COMPLEX_REAL (y)
			     && 0.0 == SCM_COMPLEX_IMAG (y));
	}
      else
	{
	  if (SCM_SLOPPY_REALP (y))
	    return SCM_BOOL (SCM_COMPLEX_REAL (x) == SCM_REAL_VALUE (y)
			     && SCM_COMPLEX_IMAG (x) == 0.0);
	  else
	    return SCM_BOOL (SCM_COMPLEX_REAL (x) == SCM_COMPLEX_REAL (y)
			     && SCM_COMPLEX_IMAG (x) == SCM_COMPLEX_IMAG (y));
	}
    }
  if (SCM_NINUMP (y))
    {
#ifdef SCM_BIGDIG
      SCM_ASRTGO (SCM_NIMP (y), bady);
      if (SCM_BIGP (y))
	return SCM_BOOL_F;
      if (!SCM_SLOPPY_INEXACTP (y))
	{
	bady:
	  SCM_WTA_DISPATCH_2 (g_eq_p, x, y, SCM_ARGn, s_eq_p);
	}
#else
      if (!SCM_SLOPPY_INEXACTP (y))
	{
	bady:
	  SCM_WTA_DISPATCH_2 (g_eq_p, x, y, SCM_ARGn, s_eq_p);
	}
#endif
    realint:
      if (SCM_SLOPPY_REALP (y))
	return SCM_BOOL ((double) SCM_INUM (x) == SCM_REAL_VALUE (y));
      else
	return SCM_BOOL ((double) SCM_INUM (x) == SCM_COMPLEX_REAL (y)
			 && 0.0 == SCM_COMPLEX_IMAG (y));
    }
  return SCM_BOOL((long) x == (long) y);
}



SCM_GPROC1 (s_less_p, "<", scm_tc7_rpsubr, scm_less_p, g_less_p);

SCM
scm_less_p (SCM x, SCM y)
{
  if (SCM_NINUMP (x))
    {
#ifdef SCM_BIGDIG
      if (!SCM_NIMP (x))
	{
	badx:
	  SCM_WTA_DISPATCH_2 (g_less_p, x, y, SCM_ARG1, s_less_p);
	}
      if (SCM_BIGP (x))
	{
	  if (SCM_INUMP (y))
	    return SCM_BOOL(SCM_BIGSIGN (x));
	  SCM_ASRTGO (SCM_NIMP (y), bady);
	  if (SCM_BIGP (y))
	    return SCM_BOOL(1 == scm_bigcomp (x, y));
	  SCM_ASRTGO (SCM_SLOPPY_REALP (y), bady);
	  return ((scm_big2dbl (x) < SCM_REALPART (y))
		  ? SCM_BOOL_T
		  : SCM_BOOL_F);
	}
      SCM_ASRTGO (SCM_SLOPPY_REALP (x), badx);
#else
      SCM_GASSERT2 (SCM_SLOPPY_REALP (x),
		    g_less_p, x, y, SCM_ARG1, s_less_p);
#endif
      if (SCM_INUMP (y))
	return ((SCM_REALPART (x) < ((double) SCM_INUM (y)))
		? SCM_BOOL_T
		: SCM_BOOL_F);
#ifdef SCM_BIGDIG
      SCM_ASRTGO (SCM_NIMP (y), bady);
      if (SCM_BIGP (y))
	return SCM_BOOL(SCM_REALPART (x) < scm_big2dbl (y));
      SCM_ASRTGO (SCM_SLOPPY_REALP (y), bady);
#else
      SCM_ASRTGO (SCM_SLOPPY_REALP (y), bady);
#endif
      return SCM_BOOL(SCM_REALPART (x) < SCM_REALPART (y));
    }
  if (SCM_NINUMP (y))
    {
#ifdef SCM_BIGDIG
      SCM_ASRTGO (SCM_NIMP (y), bady);
      if (SCM_BIGP (y))
	return SCM_NEGATE_BOOL(SCM_BIGSIGN (y));
      if (!SCM_SLOPPY_REALP (y))
	{
	bady:
	  SCM_WTA_DISPATCH_2 (g_less_p, x, y, SCM_ARGn, s_less_p);
	}
#else
      if (!SCM_SLOPPY_REALP (y))
	{
	bady:
	  SCM_WTA_DISPATCH_2 (g_less_p, x, y, SCM_ARGn, s_less_p);
	}
#endif
      return ((((double) SCM_INUM (x)) < SCM_REALPART (y))
	      ? SCM_BOOL_T
	      : SCM_BOOL_F);
    }
  return SCM_BOOL((long) x < (long) y);
}


SCM_DEFINE1 (scm_gr_p, ">", scm_tc7_rpsubr,
             (SCM x, SCM y),
	     "")
#define FUNC_NAME s_scm_gr_p
{
  return scm_less_p (y, x);
}
#undef FUNC_NAME



SCM_DEFINE1 (scm_leq_p, "<=", scm_tc7_rpsubr,
             (SCM x, SCM y),
	     "")
#define FUNC_NAME s_scm_leq_p
{
  return SCM_BOOL_NOT (scm_less_p (y, x));
}
#undef FUNC_NAME



SCM_DEFINE1 (scm_geq_p, ">=", scm_tc7_rpsubr,
             (SCM x, SCM y),
	     "")
#define FUNC_NAME s_scm_geq_p
{
  return SCM_BOOL_NOT (scm_less_p (x, y));
}
#undef FUNC_NAME



SCM_GPROC (s_zero_p, "zero?", 1, 0, 0, scm_zero_p, g_zero_p);

SCM
scm_zero_p (SCM z)
{
  if (SCM_NINUMP (z))
    {
#ifdef SCM_BIGDIG
      SCM_ASRTGO (SCM_NIMP (z), badz);
      if (SCM_BIGP (z))
	return SCM_BOOL_F;
      if (!SCM_SLOPPY_INEXACTP (z))
	{
	badz:
	  SCM_WTA_DISPATCH_1 (g_zero_p, z, SCM_ARG1, s_zero_p);
	}
#else
      SCM_GASSERT1 (SCM_SLOPPY_INEXACTP (z),
		    g_zero_p, z, SCM_ARG1, s_zero_p);
#endif
      if (SCM_SLOPPY_REALP (z))
	return SCM_BOOL (SCM_REAL_VALUE (z) == 0.0);
      else
	return SCM_BOOL (SCM_COMPLEX_REAL (z) == 0.0
			 && SCM_COMPLEX_IMAG (z) == 0.0);
    }
  return SCM_BOOL (SCM_EQ_P (z, SCM_INUM0));
}



SCM_GPROC (s_positive_p, "positive?", 1, 0, 0, scm_positive_p, g_positive_p);

SCM
scm_positive_p (SCM x)
{
  if (SCM_NINUMP (x))
    {
#ifdef SCM_BIGDIG
      SCM_ASRTGO (SCM_NIMP (x), badx);
      if (SCM_BIGP (x))
	return SCM_BOOL (!SCM_BIGSIGN (x));
      if (!SCM_SLOPPY_REALP (x))
	{
	badx:
	  SCM_WTA_DISPATCH_1 (g_positive_p, x, SCM_ARG1, s_positive_p);
	}
#else
      SCM_GASSERT1 (SCM_SLOPPY_REALP (x),
		    g_positive_p, x, SCM_ARG1, s_positive_p);
#endif
      return SCM_BOOL(SCM_REALPART (x) > 0.0);
    }
  return SCM_BOOL(SCM_INUM(x) > 0);
}



SCM_GPROC (s_negative_p, "negative?", 1, 0, 0, scm_negative_p, g_negative_p);

SCM
scm_negative_p (SCM x)
{
  if (SCM_NINUMP (x))
    {
#ifdef SCM_BIGDIG
      SCM_ASRTGO (SCM_NIMP (x), badx);
      if (SCM_BIGP (x))
	return SCM_BOOL (SCM_BIGSIGN (x));
      if (!(SCM_SLOPPY_REALP (x)))
	{
	badx:
	  SCM_WTA_DISPATCH_1 (g_negative_p, x, SCM_ARG1, s_negative_p);
	}
#else
      SCM_GASSERT1 (SCM_SLOPPY_REALP (x),
		    g_negative_p, x, SCM_ARG1, s_negative_p);
#endif
      return SCM_BOOL(SCM_REALPART (x) < 0.0);
    }
  return SCM_BOOL(SCM_INUM(x) < 0);
}


SCM_GPROC1 (s_max, "max", scm_tc7_asubr, scm_max, g_max);

SCM
scm_max (SCM x, SCM y)
{
  double z;
  if (SCM_UNBNDP (y))
    {
      SCM_GASSERT0 (!SCM_UNBNDP (x),
		    g_max, scm_makfrom0str (s_max), SCM_WNA, 0);
      SCM_GASSERT1 (SCM_NUMBERP (x), g_max, x, SCM_ARG1, s_max);
      return x;
    }
  if (SCM_NINUMP (x))
    {
#ifdef SCM_BIGDIG
      if (!SCM_NIMP (x))
	{
	badx2:
	  SCM_WTA_DISPATCH_2 (g_max, x, y, SCM_ARG1, s_max);
	}
      if (SCM_BIGP (x))
	{
	  if (SCM_INUMP (y))
	    return SCM_BIGSIGN (x) ? y : x;
	  SCM_ASRTGO (SCM_NIMP (y), bady);
	  if (SCM_BIGP (y))
	    return (1 == scm_bigcomp (x, y)) ? y : x;
	  SCM_ASRTGO (SCM_SLOPPY_REALP (y), bady);
	  z = scm_big2dbl (x);
	  return (z < SCM_REALPART (y)) ? y : scm_makdbl (z, 0.0);
	}
      SCM_ASRTGO (SCM_SLOPPY_REALP (x), badx2);
#else
      SCM_GASSERT2 (SCM_SLOPPY_REALP (x),
		    g_max, x, y, SCM_ARG1, s_max);
#endif
      if (SCM_INUMP (y))
	return ((SCM_REALPART (x) < (z = SCM_INUM (y)))
		? scm_makdbl (z, 0.0)
		: x);
#ifdef SCM_BIGDIG
      SCM_ASRTGO (SCM_NIMP (y), bady);
      if (SCM_BIGP (y))
	return ((SCM_REALPART (x) < (z = scm_big2dbl (y)))
		? scm_makdbl (z, 0.0)
		: x);
      SCM_ASRTGO (SCM_SLOPPY_REALP (y), bady);
#else
      SCM_ASRTGO (SCM_SLOPPY_REALP (y), bady);
#endif
      return (SCM_REALPART (x) < SCM_REALPART (y)) ? y : x;
    }
  if (SCM_NINUMP (y))
    {
#ifdef SCM_BIGDIG
      SCM_ASRTGO (SCM_NIMP (y), bady);
      if (SCM_BIGP (y))
	return SCM_BIGSIGN (y) ? x : y;
      if (!(SCM_SLOPPY_REALP (y)))
	{
	bady:
	  SCM_WTA_DISPATCH_2 (g_max, x, y, SCM_ARGn, s_max);
	}
#else
      if (!SCM_SLOPPY_REALP (y))
	{
	bady:
	  SCM_WTA_DISPATCH_2 (g_max, x, y, SCM_ARGn, s_max);
	}
#endif
      return (((z = SCM_INUM (x)) < SCM_REALPART (y))
	      ? y
	      : scm_makdbl (z, 0.0));
    }
  return ((long) x < (long) y) ? y : x;
}


#define SCM_SWAP(x,y) do { SCM t = x; x = y; y = t; } while (0)



SCM_GPROC1 (s_min, "min", scm_tc7_asubr, scm_min, g_min);

SCM
scm_min (SCM x, SCM y)
{
  double z;
  if (SCM_UNBNDP (y))
    {
      SCM_GASSERT0 (!SCM_UNBNDP (x),
		    g_min, scm_makfrom0str (s_min), SCM_WNA, 0);
      SCM_GASSERT1 (SCM_NUMBERP (x), g_min, x, SCM_ARG1, s_min);
      return x;
    }
  if (SCM_NINUMP (x))
    {
#ifdef SCM_BIGDIG
      if (!SCM_NIMP (x))
	{
	badx2:
	  SCM_WTA_DISPATCH_2 (g_min, x, y, SCM_ARG1, s_min);
	}
      if (SCM_BIGP (x))
	{
	  if (SCM_INUMP (y))
	    return SCM_BIGSIGN (x) ? x : y;
	  SCM_ASRTGO (SCM_NIMP (y), bady);
	  if (SCM_BIGP (y))
	    return (-1 == scm_bigcomp (x, y)) ? y : x;
	  SCM_ASRTGO (SCM_SLOPPY_REALP (y), bady);
	  z = scm_big2dbl (x);
	  return (z > SCM_REALPART (y)) ? y : scm_makdbl (z, 0.0);
	}
      SCM_ASRTGO (SCM_SLOPPY_REALP (x), badx2);
#else
      SCM_GASSERT2 (SCM_SLOPPY_REALP (x),
		    g_min, x, y, SCM_ARG1, s_min);
#endif
      if (SCM_INUMP (y))
	return ((SCM_REALPART (x) > (z = SCM_INUM (y)))
		? scm_makdbl (z, 0.0)
		: x);
#ifdef SCM_BIGDIG
      SCM_ASRTGO (SCM_NIMP (y), bady);
      if (SCM_BIGP (y))
	return ((SCM_REALPART (x) > (z = scm_big2dbl (y)))
		? scm_makdbl (z, 0.0)
		: x);
      SCM_ASRTGO (SCM_SLOPPY_REALP (y), bady);
#else
      SCM_ASRTGO (SCM_SLOPPY_REALP (y), bady);
#endif
      return (SCM_REALPART (x) > SCM_REALPART (y)) ? y : x;
    }
  if (SCM_NINUMP (y))
    {
#ifdef SCM_BIGDIG
      SCM_ASRTGO (SCM_NIMP (y), bady);
      if (SCM_BIGP (y))
	return SCM_BIGSIGN (y) ? y : x;
      if (!(SCM_SLOPPY_REALP (y)))
	{
	bady:
	  SCM_WTA_DISPATCH_2 (g_min, x, y, SCM_ARGn, s_min);
	}
#else
      if (!SCM_SLOPPY_REALP (y))
	{
	bady:
	  SCM_WTA_DISPATCH_2 (g_min, x, y, SCM_ARGn, s_min);
	}
#endif
      return (((z = SCM_INUM (x)) > SCM_REALPART (y))
	      ? y
	      : scm_makdbl (z, 0.0));
    }
  return ((long) x > (long) y) ? y : x;
}




SCM_GPROC1 (s_sum, "+", scm_tc7_asubr, scm_sum, g_sum);

/*
  This is sick, sick, sick code.

 */
SCM
scm_sum (SCM x, SCM y)
{
  if (SCM_UNBNDP (y))
    {
      if (SCM_UNBNDP (x))
	return SCM_INUM0;
      SCM_GASSERT1 (SCM_NUMBERP (x), g_sum, x, SCM_ARG1, s_sum);
      return x;
    }
  if (SCM_NINUMP (x))
    {
# ifdef SCM_BIGDIG
      if (!SCM_NIMP (x))
	{
	badx2:
	  SCM_WTA_DISPATCH_2 (g_sum, x, y, SCM_ARG1, s_sum);
	}
      if (SCM_BIGP (x))
	{
	  if (SCM_INUMP (y))
	    {
	      SCM_SWAP(x,y);
	      goto intbig;
	    }
	  SCM_ASRTGO (SCM_NIMP (y), bady);
	  if (SCM_BIGP (y))
	    {
	      if (SCM_NUMDIGS (x) > SCM_NUMDIGS (y))
		{
		  SCM_SWAP(x,y);
		}
	      return scm_addbig (SCM_BDIGITS (x), SCM_NUMDIGS (x),
				 SCM_BIGSIGN (x),
				 y, 0);
	    }
	  SCM_ASRTGO (SCM_SLOPPY_INEXACTP (y), bady);
	bigreal:
	  if (SCM_SLOPPY_REALP (y))
	    return scm_make_real (scm_big2dbl (x) + SCM_REAL_VALUE (y));
	  else
	    return scm_make_complex (scm_big2dbl (x) + SCM_COMPLEX_REAL (y),
				     SCM_COMPLEX_IMAG (y));
	}
# endif /* SCM_BIGDIG */
      SCM_ASRTGO (SCM_SLOPPY_INEXACTP (x), badx2);

      if (SCM_INUMP (y))
	{
	  SCM_SWAP(x,y);
	  goto intreal;
	}
# ifdef SCM_BIGDIG
      SCM_ASRTGO (SCM_NIMP (y), bady);
      if (SCM_BIGP (y))
	{
	  SCM_SWAP(x,y);
	  goto bigreal;
	}
      else if (!SCM_SLOPPY_INEXACTP (y))
	{
	bady:
	  SCM_WTA_DISPATCH_2 (g_sum, x, y, SCM_ARGn, s_sum);
	}
# else  /* SCM_BIGDIG */
      if (!SCM_SLOPPY_INEXACTP (y))
	{
	bady:
	  SCM_WTA_DISPATCH_2 (g_sum, x, y, SCM_ARGn, s_sum);
	}
# endif /* SCM_BIGDIG */
      {
	double i = 0.0;
	if (SCM_SLOPPY_COMPLEXP (x))
	  i = SCM_COMPLEX_IMAG (x);
	if (SCM_SLOPPY_COMPLEXP (y))
	  i += SCM_COMPLEX_IMAG (y);
	return scm_makdbl (SCM_REALPART (x) + SCM_REALPART (y), i);
      }
    }
  if (SCM_NINUMP (y))
    {
# ifdef SCM_BIGDIG
      SCM_ASRTGO (SCM_NIMP (y), bady);
      if (SCM_BIGP (y))
	{
	intbig:
	  {
	    long i = SCM_INUM (x);
#  ifndef SCM_DIGSTOOBIG
	    long z = scm_pseudolong (i);
	    return scm_addbig ((SCM_BIGDIG *) & z,
			       SCM_DIGSPERLONG,
			       (i < 0) ? SCM_BIGSIGNFLAG : 0,
			       y, 0);
#  else  /* SCM_DIGSTOOBIG */
	    SCM_BIGDIG zdigs[SCM_DIGSPERLONG];
	    scm_longdigs (i, zdigs);
	    return scm_addbig (zdigs, SCM_DIGSPERLONG, (i < 0) ? SCM_BIGSIGNFLAG : 0,
			       y, 0);
#  endif /* SCM_DIGSTOOBIG */
	  }
	}
# endif /* SCM_BIGDIG */
      SCM_ASRTGO (SCM_SLOPPY_INEXACTP (y), bady);
    intreal:
      if (SCM_REALP (y))
	return scm_make_real (SCM_INUM (x) + SCM_REAL_VALUE (y));
      else
	return scm_make_complex (SCM_INUM (x) + SCM_COMPLEX_REAL (y),
				 SCM_COMPLEX_IMAG (y));
    }
  { /* scope */
    long int i = SCM_INUM (x) + SCM_INUM (y);
    if (SCM_FIXABLE (i))
      return SCM_MAKINUM (i);
#ifdef SCM_BIGDIG
    return scm_long2big (i);
#else  /* SCM_BIGDIG */
    return scm_makdbl ((double) i, 0.0);
#endif /* SCM_BIGDIG */ 
  } /* end scope */
}




SCM_GPROC1 (s_difference, "-", scm_tc7_asubr, scm_difference, g_difference);

/*
  HWN:FIXME:: This is sick,sick, sick code. Rewrite me.
*/
SCM
scm_difference (SCM x, SCM y)
{
  long int cx = 0;
  if (SCM_NINUMP (x))
    {
      if (!SCM_NIMP (x))
	{
	  if (SCM_UNBNDP (y))
	    {
	      SCM_GASSERT0 (!SCM_UNBNDP (x), g_difference,
			    scm_makfrom0str (s_difference), SCM_WNA, 0);
	    badx:
	      SCM_WTA_DISPATCH_1 (g_difference, x, SCM_ARG1, s_difference);
	    }
	  else
	    {
	    badx2:
	      SCM_WTA_DISPATCH_2 (g_difference, x, y, SCM_ARG1, s_difference);
	    }
	}
      if (SCM_UNBNDP (y))
	{
#ifdef SCM_BIGDIG
	  if (SCM_BIGP (x))
	    {
	      x = scm_copybig (x, !SCM_BIGSIGN (x));
	      return (SCM_NUMDIGS (x) * SCM_BITSPERDIG / SCM_CHAR_BIT
		      <= sizeof (SCM)
		      ? scm_big2inum (x, SCM_NUMDIGS (x))
		      : x);
	    }
#endif
	  SCM_ASRTGO (SCM_SLOPPY_INEXACTP (x), badx);
	  if (SCM_SLOPPY_REALP (x))
	    return scm_make_real (- SCM_REAL_VALUE (x));
	  else
	    return scm_make_complex (- SCM_COMPLEX_REAL (x),
				     - SCM_COMPLEX_IMAG (x));
	}
      if (SCM_INUMP (y))
	return scm_sum (x, SCM_MAKINUM (- SCM_INUM (y)));
#ifdef SCM_BIGDIG
      SCM_ASRTGO (SCM_NIMP (y), bady);
      if (SCM_BIGP (x))
	{
	  if (SCM_BIGP (y))
	    return ((SCM_NUMDIGS (x) < SCM_NUMDIGS (y))
		    ? scm_addbig (SCM_BDIGITS (x), SCM_NUMDIGS (x),
				  SCM_BIGSIGN (x),
				  y, SCM_BIGSIGNFLAG)
		    : scm_addbig (SCM_BDIGITS (y), SCM_NUMDIGS (y),
				  SCM_BIGSIGN (y) ^ SCM_BIGSIGNFLAG,
				  x, 0));
	  SCM_ASRTGO (SCM_SLOPPY_INEXACTP (y), bady);
	  if (SCM_REALP (y))
	    return scm_make_real (scm_big2dbl (x) - SCM_REAL_VALUE (y));
	  else
	    return scm_make_complex (scm_big2dbl (x) - SCM_COMPLEX_REAL (y),
				     - SCM_COMPLEX_IMAG (y));
	}
      SCM_ASRTGO (SCM_SLOPPY_INEXACTP (x), badx2);
      if (SCM_BIGP (y))
	{
	  if (SCM_REALP (x))
	    return scm_make_real (SCM_REAL_VALUE (x) - scm_big2dbl (y));
	  else
	    return scm_make_complex (SCM_COMPLEX_REAL (x) - scm_big2dbl (y),
				     SCM_COMPLEX_IMAG (x));
	}
      SCM_ASRTGO (SCM_SLOPPY_INEXACTP (y), bady);
#else
      SCM_ASRTGO (SCM_SLOPPY_INEXACTP (x), badx2);
      SCM_ASRTGO (SCM_SLOPPY_INEXACTP (y), bady);
#endif
      {
	SCM z;
	if (SCM_SLOPPY_COMPLEXP (x))
	  {
	    if (SCM_SLOPPY_COMPLEXP (y))
	      SCM_NEWCOMPLEX (z,
			      SCM_COMPLEX_REAL (x) - SCM_COMPLEX_REAL (y),
			      SCM_COMPLEX_IMAG (x) - SCM_COMPLEX_IMAG (y));
	    else
	      SCM_NEWCOMPLEX (z,
			      SCM_COMPLEX_REAL (x) - SCM_REAL_VALUE (y),
			      SCM_COMPLEX_IMAG (x));
	  }
	else
	  {
	    if (SCM_SLOPPY_COMPLEXP (y))
	      SCM_NEWCOMPLEX (z,
			      SCM_REAL_VALUE (x) - SCM_COMPLEX_REAL (y),
			      - SCM_COMPLEX_IMAG (y));
	    else
	      SCM_NEWREAL (z, SCM_REAL_VALUE (x) - SCM_REAL_VALUE (y));
	  }
	return z;
      }
    }
  if (SCM_UNBNDP (y))
    {
      cx = -SCM_INUM (x);
      goto checkx;
    }
  if (SCM_NINUMP (y))
    {
#ifdef SCM_BIGDIG
      SCM_ASRTGO (SCM_NIMP (y), bady);
      if (SCM_BIGP (y))
	{
	  long i = SCM_INUM (x);
#ifndef SCM_DIGSTOOBIG
	  long z = scm_pseudolong (i);
	  return scm_addbig ((SCM_BIGDIG *) & z, SCM_DIGSPERLONG,
			     (i < 0) ? SCM_BIGSIGNFLAG : 0,
			     y, SCM_BIGSIGNFLAG);
#else
	  SCM_BIGDIG zdigs[SCM_DIGSPERLONG];
	  scm_longdigs (i, zdigs);
	  return scm_addbig (zdigs, SCM_DIGSPERLONG, (i < 0) ? SCM_BIGSIGNFLAG : 0,
			     y, SCM_BIGSIGNFLAG);
#endif
	}
      if (!SCM_SLOPPY_INEXACTP (y))
	{
	bady:
	  SCM_WTA_DISPATCH_2 (g_difference, x, y, SCM_ARGn, s_difference);
	}
#else
      if (!SCM_SLOPPY_INEXACTP (y))
	{
	bady:
	  SCM_WTA_DISPATCH_2 (g_difference, x, y, SCM_ARGn, s_difference);
	}
#endif
      return scm_makdbl (SCM_INUM (x) - SCM_REALPART (y),
			 SCM_SLOPPY_COMPLEXP (y) ? -SCM_IMAG (y) : 0.0);
    }
  cx = SCM_INUM (x) - SCM_INUM (y);
 checkx:
  if (SCM_FIXABLE (cx))
    return SCM_MAKINUM (cx);
#ifdef SCM_BIGDIG
  return scm_long2big (cx);
#else
  return scm_makdbl ((double) cx, 0.0);
#endif
}




SCM_GPROC1 (s_product, "*", scm_tc7_asubr, scm_product, g_product);

SCM
scm_product (SCM x, SCM y)
{
  if (SCM_UNBNDP (y))
    {
      if (SCM_UNBNDP (x))
	return SCM_MAKINUM (1L);
      SCM_GASSERT1 (SCM_NUMBERP (x), g_product, x, SCM_ARG1, s_product);
      return x;
    }
  if (SCM_NINUMP (x))
    {
      SCM t;
#ifdef SCM_BIGDIG
      if (!SCM_NIMP (x))
	{
	badx2:
	  SCM_WTA_DISPATCH_2 (g_product, x, y, SCM_ARG1, s_product);
	}
      if (SCM_BIGP (x))
	{
	  if (SCM_INUMP (y))
	    {
	      t = x;
	      x = y;
	      y = t;
	      goto intbig;
	    }
	  SCM_ASRTGO (SCM_NIMP (y), bady);
	  if (SCM_BIGP (y))
	    return scm_mulbig (SCM_BDIGITS (x), SCM_NUMDIGS (x),
			       SCM_BDIGITS (y), SCM_NUMDIGS (y),
			       SCM_BIGSIGN (x) ^ SCM_BIGSIGN (y));
	  SCM_ASRTGO (SCM_SLOPPY_INEXACTP (y), bady);
	bigreal:
	  {
	    double bg = scm_big2dbl (x);
	    return scm_makdbl (bg * SCM_REALPART (y),
			       SCM_SLOPPY_COMPLEXP (y) ? bg * SCM_IMAG (y) : 0.0);
	  }
	}
      SCM_ASRTGO (SCM_SLOPPY_INEXACTP (x), badx2);
#else
      SCM_ASRTGO (SCM_SLOPPY_INEXACTP (x), badx2);
#endif
      if (SCM_INUMP (y))
	{
	  t = x;
	  x = y;
	  y = t;
	  goto intreal;
	}
#ifdef SCM_BIGDIG
      SCM_ASRTGO (SCM_NIMP (y), bady);
      if (SCM_BIGP (y))
	{
	  t = x;
	  x = y;
	  y = t;
	  goto bigreal;
	}
      else if (!(SCM_SLOPPY_INEXACTP (y)))
	{
	bady:
	  SCM_WTA_DISPATCH_2 (g_product, x, y, SCM_ARGn, s_product);
	}
#else
      if (!SCM_SLOPPY_INEXACTP (y))
	{
	bady:
	  SCM_WTA_DISPATCH_2 (g_product, x, y, SCM_ARGn, s_product);
	}
#endif
      if (SCM_SLOPPY_COMPLEXP (x))
	{
	  if (SCM_SLOPPY_COMPLEXP (y))
	    return scm_makdbl (SCM_REAL (x) * SCM_REAL (y)
			       - SCM_IMAG (x) * SCM_IMAG (y),
			       SCM_REAL (x) * SCM_IMAG (y)
			       + SCM_IMAG (x) * SCM_REAL (y));
	  else
	    return scm_makdbl (SCM_REAL (x) * SCM_REALPART (y),
			       SCM_IMAG (x) * SCM_REALPART (y));
	}
      return scm_makdbl (SCM_REALPART (x) * SCM_REALPART (y),
			 SCM_SLOPPY_COMPLEXP (y)
			 ? SCM_REALPART (x) * SCM_IMAG (y)
			 : 0.0);
    }
  if (SCM_NINUMP (y))
    {
#ifdef SCM_BIGDIG
      SCM_ASRTGO (SCM_NIMP (y), bady);
      if (SCM_BIGP (y))
	{
	intbig:
	  if (SCM_EQ_P (x, SCM_INUM0))
	    return x;
	  if (SCM_EQ_P (x, SCM_MAKINUM (1L)))
	    return y;
	  {
#ifndef SCM_DIGSTOOBIG
	    long z = scm_pseudolong (SCM_INUM (x));
	    return scm_mulbig ((SCM_BIGDIG *) & z, SCM_DIGSPERLONG,
			       SCM_BDIGITS (y), SCM_NUMDIGS (y),
			       SCM_BIGSIGN (y) ? (x > 0) : (x < 0));
#else
	    SCM_BIGDIG zdigs[SCM_DIGSPERLONG];
	    scm_longdigs (SCM_INUM (x), zdigs);
	    return scm_mulbig (zdigs, SCM_DIGSPERLONG,
			       SCM_BDIGITS (y), SCM_NUMDIGS (y),
			       SCM_BIGSIGN (y) ? (x > 0) : (x < 0));
#endif
	  }
	}
      SCM_ASRTGO (SCM_SLOPPY_INEXACTP (y), bady);
#else
      SCM_ASRTGO (SCM_SLOPPY_INEXACTP (y), bady);
#endif
    intreal:
      return scm_makdbl (SCM_INUM (x) * SCM_REALPART (y),
			 SCM_SLOPPY_COMPLEXP (y) ? SCM_INUM (x) * SCM_IMAG (y) : 0.0);
    }
  {
    long i, j, k;
    i = SCM_INUM (x);
    if (0 == i)
      return x;
    j = SCM_INUM (y);
    k = i * j;
    y = SCM_MAKINUM (k);
    if (k != SCM_INUM (y) || k / i != j)
#ifdef SCM_BIGDIG
      {
	int sgn = (i < 0) ^ (j < 0);
#ifndef SCM_DIGSTOOBIG
	i = scm_pseudolong (i);
	j = scm_pseudolong (j);
	return scm_mulbig ((SCM_BIGDIG *) & i, SCM_DIGSPERLONG,
			   (SCM_BIGDIG *) & j, SCM_DIGSPERLONG, sgn);
#else /* SCM_DIGSTOOBIG */
	SCM_BIGDIG idigs[SCM_DIGSPERLONG];
	SCM_BIGDIG jdigs[SCM_DIGSPERLONG];
	scm_longdigs (i, idigs);
	scm_longdigs (j, jdigs);
	return scm_mulbig (idigs, SCM_DIGSPERLONG,
			   jdigs, SCM_DIGSPERLONG,
			   sgn);
#endif
      }
#else
    return scm_makdbl (((double) i) * ((double) j), 0.0);
#endif
    return y;
  }
}



double
scm_num2dbl (SCM a, const char *why)
{
  if (SCM_INUMP (a))
    return (double) SCM_INUM (a);
  SCM_ASSERT (SCM_NIMP (a), a, "wrong type argument", why);
  if (SCM_SLOPPY_REALP (a))
    return (SCM_REALPART (a));
#ifdef SCM_BIGDIG
  return scm_big2dbl (a);
#endif
  SCM_ASSERT (0, a, "wrong type argument", why);
  /*
    unreachable, hopefully.
   */
  return (double) 0.0;		/* ugh. */
  /* return SCM_UNSPECIFIED; */
}


SCM_GPROC1 (s_divide, "/", scm_tc7_asubr, scm_divide, g_divide);

SCM
scm_divide (SCM x, SCM y)
{
  double d, r, i, a;
  if (SCM_NINUMP (x))
    {
      if (!(SCM_NIMP (x)))
	{
	  if (SCM_UNBNDP (y))
	    {
	      SCM_GASSERT0 (!SCM_UNBNDP (x),
			    g_divide, scm_makfrom0str (s_divide), SCM_WNA, 0);
	    badx:
	      SCM_WTA_DISPATCH_1 (g_divide, x, SCM_ARG1, s_divide);
	    }
	  else
	    {
	    badx2:
	      SCM_WTA_DISPATCH_2 (g_divide, x, y, SCM_ARG1, s_divide);
	    }
	}
      if (SCM_UNBNDP (y))
	{
#ifdef SCM_BIGDIG
	  if (SCM_BIGP (x))
	    return scm_makdbl (1.0 / scm_big2dbl (x), 0.0);
#endif
	  SCM_ASRTGO (SCM_SLOPPY_INEXACTP (x), badx);
	  if (SCM_SLOPPY_REALP (x))
	    return scm_makdbl (1.0 / SCM_REALPART (x), 0.0);
	  r = SCM_REAL (x);
	  i = SCM_IMAG (x);
	  d = r * r + i * i;
	  return scm_makdbl (r / d, -i / d);
	}
#ifdef SCM_BIGDIG
      if (SCM_BIGP (x))
	{
	  if (SCM_INUMP (y))
	    {
	      long int z = SCM_INUM (y);
#ifndef SCM_RECKLESS
	      if (!z)
		scm_num_overflow (s_divide);
#endif
	      if (1 == z)
		return x;
	      if (z < 0)
		z = -z;
	      if (z < SCM_BIGRAD)
		{
		  SCM w = scm_copybig (x, SCM_BIGSIGN (x) ? (y > 0) : (y < 0));
		  return (scm_divbigdig (SCM_BDIGITS (w), SCM_NUMDIGS (w),
					 (SCM_BIGDIG) z)
			  ? scm_makdbl (scm_big2dbl (x) / SCM_INUM (y), 0.0)
			  : scm_normbig (w));
		}
#ifndef SCM_DIGSTOOBIG
	      /*ugh! Does anyone know what this is supposed to do?*/
	      z = scm_pseudolong (z);
	      z = SCM_INUM(scm_divbigbig (SCM_BDIGITS (x), SCM_NUMDIGS (x),
                                          (SCM_BIGDIG *) & z, SCM_DIGSPERLONG,
                                          SCM_BIGSIGN (x) ? (y > 0) : (y < 0), 3));
#else
	      {
		SCM_BIGDIG zdigs[SCM_DIGSPERLONG];
		scm_longdigs (z, zdigs);
		z = scm_divbigbig (SCM_BDIGITS (x), SCM_NUMDIGS (x),
				   zdigs, SCM_DIGSPERLONG,
				   SCM_BIGSIGN (x) ? (y > 0) : (y < 0), 3);
	      }
#endif
	      return z ? SCM_PACK (z) : scm_makdbl (scm_big2dbl (x) / SCM_INUM (y), 0.0);
	    }
	  SCM_ASRTGO (SCM_NIMP (y), bady);
	  if (SCM_BIGP (y))
	    {
	      SCM z = scm_divbigbig (SCM_BDIGITS (x), SCM_NUMDIGS (x),
				 SCM_BDIGITS (y), SCM_NUMDIGS (y),
				 SCM_BIGSIGN (x) ^ SCM_BIGSIGN (y), 3);
	      return z ? z : scm_makdbl (scm_big2dbl (x) / scm_big2dbl (y),
					 0.0);
	    }
	  SCM_ASRTGO (SCM_SLOPPY_INEXACTP (y), bady);
	  if (SCM_SLOPPY_REALP (y))
	    return scm_makdbl (scm_big2dbl (x) / SCM_REALPART (y), 0.0);
	  a = scm_big2dbl (x);
	  goto complex_div;
	}
#endif
      SCM_ASRTGO (SCM_SLOPPY_INEXACTP (x), badx2);
      if (SCM_INUMP (y))
	{
	  d = SCM_INUM (y);
	  goto basic_div;
	}
#ifdef SCM_BIGDIG
      SCM_ASRTGO (SCM_NIMP (y), bady);
      if (SCM_BIGP (y))
	{
	  d = scm_big2dbl (y);
	  goto basic_div;
	}
      SCM_ASRTGO (SCM_SLOPPY_INEXACTP (y), bady);
#else
      SCM_ASRTGO (SCM_SLOPPY_INEXACTP (y), bady);
#endif
      if (SCM_SLOPPY_REALP (y))
	{
	  d = SCM_REALPART (y);
	basic_div:
	  return scm_makdbl (SCM_REALPART (x) / d,
			     SCM_SLOPPY_COMPLEXP (x) ? SCM_IMAG (x) / d : 0.0);
	}
      a = SCM_REALPART (x);
      if (SCM_SLOPPY_REALP (x))
	goto complex_div;
      r = SCM_REAL (y);
      i = SCM_IMAG (y);
      d = r * r + i * i;
      return scm_makdbl ((a * r + SCM_IMAG (x) * i) / d,
			 (SCM_IMAG (x) * r - a * i) / d);
    }
  if (SCM_UNBNDP (y))
    {
      if (SCM_EQ_P (x, SCM_MAKINUM (1L)) || SCM_EQ_P (x, SCM_MAKINUM (-1L)))
	return x;
      return scm_makdbl (1.0 / ((double) SCM_INUM (x)), 0.0);
    }
  if (SCM_NINUMP (y))
    {
#ifdef SCM_BIGDIG
      SCM_ASRTGO (SCM_NIMP (y), bady);
      if (SCM_BIGP (y))
	return scm_makdbl (SCM_INUM (x) / scm_big2dbl (y), 0.0);
      if (!(SCM_SLOPPY_INEXACTP (y)))
	{
	bady:
	  SCM_WTA_DISPATCH_2 (g_divide, x, y, SCM_ARGn, s_divide);
	}
#else
      if (!SCM_SLOPPY_INEXACTP (y))
	{
	bady:
	  SCM_WTA_DISPATCH_2 (g_divide, x, y, SCM_ARGn, s_divide);
	}
#endif
      if (SCM_SLOPPY_REALP (y))
	return scm_makdbl (SCM_INUM (x) / SCM_REALPART (y), 0.0);
      a = SCM_INUM (x);
    complex_div:
      r = SCM_REAL (y);
      i = SCM_IMAG (y);
      d = r * r + i * i;
      return scm_makdbl ((a * r) / d, (-a * i) / d);
    }
  {
    long z = SCM_INUM (y);
    if ((0 == z) || SCM_INUM (x) % z)
      goto ov;
    z = SCM_INUM (x) / z;
    if (SCM_FIXABLE (z))
      return SCM_MAKINUM (z);
#ifdef SCM_BIGDIG
    return scm_long2big (z);
#endif
  ov:
    return scm_makdbl (((double) SCM_INUM (x)) / ((double) SCM_INUM (y)), 0.0);
  }
}




SCM_GPROC1 (s_asinh, "$asinh", scm_tc7_cxr, (SCM (*)()) scm_asinh, g_asinh);

double
scm_asinh (double x)
{
  return log (x + sqrt (x * x + 1));
}




SCM_GPROC1 (s_acosh, "$acosh", scm_tc7_cxr, (SCM (*)()) scm_acosh, g_acosh);

double
scm_acosh (double x)
{
  return log (x + sqrt (x * x - 1));
}




SCM_GPROC1 (s_atanh, "$atanh", scm_tc7_cxr, (SCM (*)()) scm_atanh, g_atanh);

double
scm_atanh (double x)
{
  return 0.5 * log ((1 + x) / (1 - x));
}




SCM_GPROC1 (s_truncate, "truncate", scm_tc7_cxr, (SCM (*)()) scm_truncate, g_truncate);

double
scm_truncate (double x)
{
  if (x < 0.0)
    return -floor (-x);
  return floor (x);
}



SCM_GPROC1 (s_round, "round", scm_tc7_cxr, (SCM (*)()) scm_round, g_round);

double
scm_round (double x)
{
  double plus_half = x + 0.5;
  double result = floor (plus_half);
  /* Adjust so that the scm_round is towards even.  */
  return (plus_half == result && plus_half / 2 != floor (plus_half / 2))
    ? result - 1 : result;
}



SCM_GPROC1 (s_exact_to_inexact, "exact->inexact", scm_tc7_cxr, (SCM (*)()) scm_exact_to_inexact, g_exact_to_inexact);

double
scm_exact_to_inexact (double z)
{
  return z;
}


SCM_GPROC1 (s_i_floor, "floor", scm_tc7_cxr, (SCM (*)()) floor, g_i_floor);
SCM_GPROC1 (s_i_ceil, "ceiling", scm_tc7_cxr, (SCM (*)()) ceil, g_i_ceil);
SCM_GPROC1 (s_i_sqrt, "$sqrt", scm_tc7_cxr, (SCM (*)()) sqrt, g_i_sqrt);
SCM_GPROC1 (s_i_abs, "$abs", scm_tc7_cxr, (SCM (*)()) fabs, g_i_abs);
SCM_GPROC1 (s_i_exp, "$exp", scm_tc7_cxr, (SCM (*)()) exp, g_i_exp);
SCM_GPROC1 (s_i_log, "$log", scm_tc7_cxr, (SCM (*)()) log, g_i_log);
SCM_GPROC1 (s_i_sin, "$sin", scm_tc7_cxr, (SCM (*)()) sin, g_i_sin);
SCM_GPROC1 (s_i_cos, "$cos", scm_tc7_cxr, (SCM (*)()) cos, g_i_cos);
SCM_GPROC1 (s_i_tan, "$tan", scm_tc7_cxr, (SCM (*)()) tan, g_i_tan);
SCM_GPROC1 (s_i_asin, "$asin", scm_tc7_cxr, (SCM (*)()) asin, g_i_asin);
SCM_GPROC1 (s_i_acos, "$acos", scm_tc7_cxr, (SCM (*)()) acos, g_i_acos);
SCM_GPROC1 (s_i_atan, "$atan", scm_tc7_cxr, (SCM (*)()) atan, g_i_atan);
SCM_GPROC1 (s_i_sinh, "$sinh", scm_tc7_cxr, (SCM (*)()) sinh, g_i_sinh);
SCM_GPROC1 (s_i_cosh, "$cosh", scm_tc7_cxr, (SCM (*)()) cosh, g_i_cosh);
SCM_GPROC1 (s_i_tanh, "$tanh", scm_tc7_cxr, (SCM (*)()) tanh, g_i_tanh);

struct dpair
{
  double x, y;
};

static void scm_two_doubles (SCM z1,
			     SCM z2,
			     const char *sstring,
			     struct dpair * xy);

static void
scm_two_doubles (SCM z1, SCM z2, const char *sstring, struct dpair *xy)
{
  if (SCM_INUMP (z1))
    xy->x = SCM_INUM (z1);
  else
    {
#ifdef SCM_BIGDIG
      SCM_ASRTGO (SCM_NIMP (z1), badz1);
      if (SCM_BIGP (z1))
	xy->x = scm_big2dbl (z1);
      else
	{
#ifndef SCM_RECKLESS
	  if (!SCM_SLOPPY_REALP (z1))
	    badz1:scm_wta (z1, (char *) SCM_ARG1, sstring);
#endif
	  xy->x = SCM_REALPART (z1);
	}
#else
      {
	SCM_ASSERT (SCM_SLOPPY_REALP (z1), z1, SCM_ARG1, sstring);
	xy->x = SCM_REALPART (z1);
      }
#endif
    }
  if (SCM_INUMP (z2))
    xy->y = SCM_INUM (z2);
  else
    {
#ifdef SCM_BIGDIG
      SCM_ASRTGO (SCM_NIMP (z2), badz2);
      if (SCM_BIGP (z2))
	xy->y = scm_big2dbl (z2);
      else
	{
#ifndef SCM_RECKLESS
	  if (!(SCM_SLOPPY_REALP (z2)))
	    badz2:scm_wta (z2, (char *) SCM_ARG2, sstring);
#endif
	  xy->y = SCM_REALPART (z2);
	}
#else
      {
	SCM_ASSERT (SCM_SLOPPY_REALP (z2), z2, SCM_ARG2, sstring);
	xy->y = SCM_REALPART (z2);
      }
#endif
    }
}




SCM_DEFINE (scm_sys_expt, "$expt", 2, 0, 0,
            (SCM z1, SCM z2),
	    "")
#define FUNC_NAME s_scm_sys_expt
{
  struct dpair xy;
  scm_two_doubles (z1, z2, FUNC_NAME, &xy);
  return scm_makdbl (pow (xy.x, xy.y), 0.0);
}
#undef FUNC_NAME



SCM_DEFINE (scm_sys_atan2, "$atan2", 2, 0, 0,
            (SCM z1, SCM z2),
	    "")
#define FUNC_NAME s_scm_sys_atan2
{
  struct dpair xy;
  scm_two_doubles (z1, z2, FUNC_NAME, &xy);
  return scm_makdbl (atan2 (xy.x, xy.y), 0.0);
}
#undef FUNC_NAME



SCM_DEFINE (scm_make_rectangular, "make-rectangular", 2, 0, 0,
            (SCM z1, SCM z2),
	    "")
#define FUNC_NAME s_scm_make_rectangular
{
  struct dpair xy;
  scm_two_doubles (z1, z2, FUNC_NAME, &xy);
  return scm_makdbl (xy.x, xy.y);
}
#undef FUNC_NAME



SCM_DEFINE (scm_make_polar, "make-polar", 2, 0, 0,
            (SCM z1, SCM z2),
	    "")
#define FUNC_NAME s_scm_make_polar
{
  struct dpair xy;
  scm_two_doubles (z1, z2, FUNC_NAME, &xy);
  return scm_makdbl (xy.x * cos (xy.y), xy.x * sin (xy.y));
}
#undef FUNC_NAME




SCM_GPROC (s_real_part, "real-part", 1, 0, 0, scm_real_part, g_real_part);

SCM
scm_real_part (SCM z)
{
  if (SCM_NINUMP (z))
    {
#ifdef SCM_BIGDIG
      SCM_ASRTGO (SCM_NIMP (z), badz);
      if (SCM_BIGP (z))
	return z;
      if (!(SCM_SLOPPY_INEXACTP (z)))
	{
	badz:
	  SCM_WTA_DISPATCH_1 (g_real_part, z, SCM_ARG1, s_real_part);
	}
#else
      SCM_GASSERT1 (SCM_SLOPPY_INEXACTP (z),
		    g_real_part, z, SCM_ARG1, s_real_part);
#endif
      if (SCM_SLOPPY_COMPLEXP (z))
	return scm_makdbl (SCM_REAL (z), 0.0);
    }
  return z;
}



SCM_GPROC (s_imag_part, "imag-part", 1, 0, 0, scm_imag_part, g_imag_part);

SCM
scm_imag_part (SCM z)
{
  if (SCM_INUMP (z))
    return SCM_INUM0;
#ifdef SCM_BIGDIG
  SCM_ASRTGO (SCM_NIMP (z), badz);
  if (SCM_BIGP (z))
    return SCM_INUM0;
  if (!(SCM_SLOPPY_INEXACTP (z)))
    {
    badz:
      SCM_WTA_DISPATCH_1 (g_imag_part, z, SCM_ARG1, s_imag_part);
    }
#else
  SCM_GASSERT1 (SCM_SLOPPY_INEXACTP (z),
		g_imag_part, z, SCM_ARG1, s_imag_part);
#endif
  if (SCM_SLOPPY_COMPLEXP (z))
    return scm_makdbl (SCM_IMAG (z), 0.0);
  return scm_flo0;
}



SCM_GPROC (s_magnitude, "magnitude", 1, 0, 0, scm_magnitude, g_magnitude);

SCM
scm_magnitude (SCM z)
{
  if (SCM_INUMP (z))
    return scm_abs (z);
#ifdef SCM_BIGDIG
  SCM_ASRTGO (SCM_NIMP (z), badz);
  if (SCM_BIGP (z))
    return scm_abs (z);
  if (!(SCM_SLOPPY_INEXACTP (z)))
    {
    badz:
      SCM_WTA_DISPATCH_1 (g_magnitude, z, SCM_ARG1, s_magnitude);
    }
#else
  SCM_GASSERT1 (SCM_SLOPPY_INEXACTP (z),
		g_magnitude, z, SCM_ARG1, s_magnitude);
#endif
  if (SCM_SLOPPY_COMPLEXP (z))
    {
      double i = SCM_IMAG (z), r = SCM_REAL (z);
      return scm_makdbl (sqrt (i * i + r * r), 0.0);
    }
  return scm_makdbl (fabs (SCM_REALPART (z)), 0.0);
}




SCM_GPROC (s_angle, "angle", 1, 0, 0, scm_angle, g_angle);

SCM
scm_angle (SCM z)
{
  double x, y = 0.0;
  if (SCM_INUMP (z))
    {
      x = (z >= SCM_INUM0) ? 1.0 : -1.0;
      goto do_angle;
    }
#ifdef SCM_BIGDIG
  SCM_ASRTGO (SCM_NIMP (z), badz);
  if (SCM_BIGP (z))
    {
      x = (SCM_BIGSIGN (z)) ? -1.0 : 1.0;
      goto do_angle;
    }
  if (!(SCM_SLOPPY_INEXACTP (z)))
    {
    badz:
      SCM_WTA_DISPATCH_1 (g_angle, z, SCM_ARG1, s_angle);
    }
#else
  SCM_GASSERT1 (SCM_SLOPPY_INEXACTP (z), g_angle, z, SCM_ARG1, s_angle);
#endif
  if (SCM_SLOPPY_REALP (z))
    {
      x = SCM_REALPART (z);
      goto do_angle;
    }
  x = SCM_REAL (z);
  y = SCM_IMAG (z);
 do_angle:
  return scm_makdbl (atan2 (y, x), 0.0);
}


SCM_DEFINE (scm_inexact_to_exact, "inexact->exact", 1, 0, 0, 
            (SCM z),
	    "")
#define FUNC_NAME s_scm_inexact_to_exact
{
  if (SCM_INUMP (z))
    return z;
#ifdef SCM_BIGDIG
  SCM_ASRTGO (SCM_NIMP (z), badz);
  if (SCM_BIGP (z))
    return z;
#ifndef SCM_RECKLESS
  if (!(SCM_SLOPPY_REALP (z)))
    {
    badz:
      SCM_WTA (1, z);
    }
#endif
#else
  SCM_VALIDATE_REAL (1,z);
#endif
#ifdef SCM_BIGDIG
  {
    double u = floor (SCM_REALPART (z) + 0.5);
    if ((u <= SCM_MOST_POSITIVE_FIXNUM) && (-u <= -SCM_MOST_NEGATIVE_FIXNUM))
      {
	/* Negation is a workaround for HP700 cc bug */
	SCM ans = SCM_MAKINUM ((long) u);
	if (SCM_INUM (ans) == (long) u)
	  return ans;
      }
    SCM_ASRTGO (isfinite (u), badz);	/* problem? */
    return scm_dbl2big (u);
  }
#else
  return SCM_MAKINUM ((long) floor (SCM_REALPART (z) + 0.5));
#endif
}
#undef FUNC_NAME



#ifdef SCM_BIGDIG
/* d must be integer */

SCM
scm_dbl2big (double d)
{
  scm_sizet i = 0;
  long c;
  SCM_BIGDIG *digits;
  SCM ans;
  double u = (d < 0) ? -d : d;
  while (0 != floor (u))
    {
      u /= SCM_BIGRAD;
      i++;
    }
  ans = scm_mkbig (i, d < 0);
  digits = SCM_BDIGITS (ans);
  while (i--)
    {
      u *= SCM_BIGRAD;
      c = floor (u);
      u -= c;
      digits[i] = c;
    }
#ifndef SCM_RECKLESS
  if (u != 0)
    scm_num_overflow ("dbl2big");
#endif
  return ans;
}



double
scm_big2dbl (SCM b)
{
  double ans = 0.0;
  scm_sizet i = SCM_NUMDIGS (b);
  SCM_BIGDIG *digits = SCM_BDIGITS (b);
  while (i--)
    ans = digits[i] + SCM_BIGRAD * ans;
  if (SCM_BIGSIGN (b))
    return - ans;
  return ans;
}
#endif


SCM
scm_long2num (long sl)
{
  if (!SCM_FIXABLE (sl))
    {
#ifdef SCM_BIGDIG
      return scm_long2big (sl);
#else
      return scm_makdbl ((double) sl, 0.0);
#endif
    }
  return SCM_MAKINUM (sl);
}


#ifdef HAVE_LONG_LONGS

SCM
scm_long_long2num (long_long sl)
{
  if (!SCM_FIXABLE (sl))
    {
#ifdef SCM_BIGDIG
      return scm_long_long2big (sl);
#else
      return scm_makdbl ((double) sl, 0.0);
#endif
    }
  else
    {
      /* we know that sl fits into an inum */
      return SCM_MAKINUM ((scm_bits_t) sl);
    }
}
#endif



SCM
scm_ulong2num (unsigned long sl)
{
  if (!SCM_POSFIXABLE (sl))
    {
#ifdef SCM_BIGDIG
      return scm_ulong2big (sl);
#else
      return scm_makdbl ((double) sl, 0.0);
#endif
    }
  return SCM_MAKINUM (sl);
}


long
scm_num2long (SCM num, char *pos, const char *s_caller)
{
  long res;

  if (SCM_INUMP (num))
    {
      res = SCM_INUM (num);
      return res;
    }
  SCM_ASRTGO (SCM_NIMP (num), wrong_type_arg);
  if (SCM_SLOPPY_REALP (num))
    {
      volatile double u = SCM_REALPART (num);

      res = u;
      if (res != u)
	goto out_of_range;
      return res;
    }
#ifdef SCM_BIGDIG
  if (SCM_BIGP (num))
    {
      unsigned long oldres = 0;
      scm_sizet l;
      /* can't use res directly in case num is -2^31.  */
      unsigned long pos_res = 0;

      for (l = SCM_NUMDIGS (num); l--;)
	{
	  pos_res = SCM_BIGUP (pos_res) + SCM_BDIGITS (num)[l];
	  /* check for overflow.  */
	  if (pos_res < oldres) 
	    goto out_of_range;
	  oldres = pos_res;
	}
      if (SCM_BIGSIGN (num))
	{
	  res = - pos_res;
	  if (res > 0)
	    goto out_of_range;
	}
      else
	{
	  res = pos_res;
	  if (res < 0)
	    goto out_of_range;
	}
      return res;
    }
#endif
 wrong_type_arg:
  scm_wrong_type_arg (s_caller, (int) pos, num);
 out_of_range:
  scm_out_of_range (s_caller, num);
}



#ifdef HAVE_LONG_LONGS

long_long
scm_num2long_long (SCM num, char *pos, const char *s_caller)
{
  long_long res;

  if (SCM_INUMP (num))
    {
      res = SCM_INUM (num);
      return res;
    }
  SCM_ASRTGO (SCM_NIMP (num), wrong_type_arg);
  if (SCM_SLOPPY_REALP (num))
    {
      double u = SCM_REALPART (num);

      res = u;
      if ((res < 0 && u > 0) || (res > 0 && u < 0)) /* check for overflow. */
	goto out_of_range;

      return res;
    }
#ifdef SCM_BIGDIG
  if (SCM_BIGP (num))
    {
      unsigned long long oldres = 0;
      scm_sizet l;
      /* can't use res directly in case num is -2^63.  */
      unsigned long long pos_res = 0;

      for (l = SCM_NUMDIGS (num); l--;)
	{
	  pos_res = SCM_LONGLONGBIGUP (pos_res) + SCM_BDIGITS (num)[l];
	  /* check for overflow.  */
	  if (pos_res < oldres) 
	    goto out_of_range;
	  oldres = pos_res;
	}
      if (SCM_BIGSIGN (num))
	{
	  res = - pos_res;
	  if (res > 0)
	    goto out_of_range;
	}
      else
	{
	  res = pos_res;
	  if (res < 0)
	    goto out_of_range;
	}
      return res;
    }
#endif
 wrong_type_arg:
  scm_wrong_type_arg (s_caller, (int) pos, num);
 out_of_range:
  scm_out_of_range (s_caller, num);
}
#endif



unsigned long
scm_num2ulong (SCM num, char *pos, const char *s_caller)
{
  unsigned long res;

  if (SCM_INUMP (num))
    {
      if (SCM_INUM (num) < 0)
	goto out_of_range;
      res = SCM_INUM (num);
      return res;
    }
  SCM_ASRTGO (SCM_NIMP (num), wrong_type_arg);
  if (SCM_SLOPPY_REALP (num))
    {
      double u = SCM_REALPART (num);

      res = u;
      if (res != u)
	goto out_of_range;
      return res;
    }
#ifdef SCM_BIGDIG
  if (SCM_BIGP (num))
    {
      unsigned long oldres = 0;
      scm_sizet l;

      res = 0;
      for (l = SCM_NUMDIGS (num); l--;)
	{
	  res = SCM_BIGUP (res) + SCM_BDIGITS (num)[l];
	  if (res < oldres)
	    goto out_of_range;
	  oldres = res;
	}
      return res;
    }
#endif
 wrong_type_arg:
  scm_wrong_type_arg (s_caller, (int) pos, num);
 out_of_range:
  scm_out_of_range (s_caller, num);
}


#ifndef DBL_DIG
static void
add1 (double f, double *fsum)
{
  *fsum = f + 1.0;
}
#endif



void
scm_init_numbers ()
{
  scm_add_feature ("complex");
  scm_add_feature ("inexact");
  SCM_NEWREAL (scm_flo0, 0.0);
#ifdef DBL_DIG
  scm_dblprec = (DBL_DIG > 20) ? 20 : DBL_DIG;
#else
  {				/* determine floating point precision */
    double f = 0.1;
    double fsum = 1.0 + f;
    while (fsum != 1.0)
      {
	f /= 10.0;
	if (++scm_dblprec > 20)
	  break;
	add1 (f, &fsum);
      }
    scm_dblprec = scm_dblprec - 1;
  }
#endif /* DBL_DIG */
#include "libguile/numbers.x"
}

/*
  Local Variables:
  c-file-style: "gnu"
  End:
*/