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

/*	Copyright (C) 1995,1996,1997,1998, 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 */

/*
  This file has code for arrays in lots of variants (double, integer,
  unsigned etc. ). It suffers from hugely repetitive code because
  there is similar (but different) code for every variant included. (urg.)

  --hwn
*/
\f

#include <stdio.h>
#include "libguile/_scm.h"
#include "libguile/chars.h"
#include "libguile/eval.h"
#include "libguile/fports.h"
#include "libguile/smob.h"
#include "libguile/strop.h"
#include "libguile/feature.h"
#include "libguile/root.h"
#include "libguile/strings.h"
#include "libguile/vectors.h"

#include "libguile/validate.h"
#include "libguile/unif.h"
#include "libguile/ramap.h"

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

\f
/* The set of uniform scm_vector types is:
 *  Vector of:		 Called:
 * unsigned char	string
 * char			byvect
 * boolean		bvect
 * signed long		ivect
 * unsigned long	uvect
 * float		fvect
 * double		dvect
 * complex double	cvect
 * short		svect
 * long long		llvect
 */

long scm_tc16_array;

/* return the size of an element in a uniform array or 0 if type not
   found.  */
scm_sizet
scm_uniform_element_size (SCM obj)
{
  scm_sizet result;

  switch (SCM_TYP7 (obj))
    {
    case scm_tc7_bvect:
    case scm_tc7_uvect:
    case scm_tc7_ivect:
      result = sizeof (long);
      break;

    case scm_tc7_byvect:
      result = sizeof (char);
      break;

    case scm_tc7_svect:
      result = sizeof (short);
      break;

#ifdef HAVE_LONG_LONGS
    case scm_tc7_llvect:
      result = sizeof (long_long);
      break;
#endif 

    case scm_tc7_fvect:
      result = sizeof (float);
      break;

    case scm_tc7_dvect:
      result = sizeof (double);
      break;

    case scm_tc7_cvect:
      result = 2 * sizeof (double);
      break;
      
    default:
      result = 0;
    }
  return result;
}

/* Silly function used not to modify the semantics of the silly
 * prototype system in order to be backward compatible.
 */
static int
singp (SCM obj)
{
  if (!SCM_SLOPPY_REALP (obj))
    return 0;
  else
    {
      double x = SCM_REAL_VALUE (obj);
      float fx = x;
      return (- SCM_FLTMAX < x) && (x < SCM_FLTMAX) && (fx == x);
    }
}

SCM 
scm_make_uve (long k, SCM prot)
{
  SCM v;
  long i, type;
  if (SCM_EQ_P (prot, SCM_BOOL_T))
    {
      i = sizeof (long) * ((k + SCM_LONG_BIT - 1) / SCM_LONG_BIT);
      type = scm_tc7_bvect;
    }
  else if (SCM_CHARP (prot) && (SCM_CHAR (prot) == '\0'))
    {
      i = sizeof (char) * k;
      type = scm_tc7_byvect;
    }    
  else if (SCM_CHARP (prot))
    {
      i = sizeof (char) * k;
      type = scm_tc7_string;
    }
  else if (SCM_INUMP (prot))
    {
      i = sizeof (long) * k;
      if (SCM_INUM (prot) > 0)
	type = scm_tc7_uvect;
      else
	type = scm_tc7_ivect;
    }
  else if (SCM_SYMBOLP (prot) && (1 == SCM_LENGTH (prot)))
    {
      char s;

      s = SCM_CHARS (prot)[0];
      if (s == 's')
	{
	  i = sizeof (short) * k;
	  type = scm_tc7_svect;
	}
#ifdef HAVE_LONG_LONGS
      else if (s == 'l')
	{
	  i = sizeof (long_long) * k;
	  type = scm_tc7_llvect;
	}
#endif
      else
	{
	  return scm_make_vector (SCM_MAKINUM (k), SCM_UNDEFINED);
	}
    }
  else
  if (SCM_IMP (prot) || !SCM_INEXACTP (prot))
    /* Huge non-unif vectors are NOT supported. */
    /* no special scm_vector */
    return scm_make_vector (SCM_MAKINUM (k), SCM_UNDEFINED);
  else if (singp (prot))
    {
      i = sizeof (float) * k;
      type = scm_tc7_fvect;
    }
  else if (SCM_COMPLEXP (prot))
    {
      i = 2 * sizeof (double) * k;
      type = scm_tc7_cvect;
    }
  else
    {
      i = sizeof (double) * k;
      type = scm_tc7_dvect;
    }

  SCM_NEWCELL (v);
  SCM_DEFER_INTS;
  SCM_SETCHARS (v, (char *) scm_must_malloc (i ? i : 1, "vector"));
  SCM_SETLENGTH (v, (k < SCM_LENGTH_MAX ? k : SCM_LENGTH_MAX), type);
  SCM_ALLOW_INTS;
  return v;
}

SCM_DEFINE (scm_uniform_vector_length, "uniform-vector-length", 1, 0, 0, 
           (SCM v),
	    "Returns the number of elements in @var{uve}.")
#define FUNC_NAME s_scm_uniform_vector_length
{
  SCM_ASRTGO (SCM_NIMP (v), badarg1);
  switch SCM_TYP7
    (v)
    {
    default:
    badarg1:SCM_WTA(1,v);
    case scm_tc7_bvect:
    case scm_tc7_string:
    case scm_tc7_byvect:
    case scm_tc7_uvect:
    case scm_tc7_ivect:
    case scm_tc7_fvect:
    case scm_tc7_dvect:
    case scm_tc7_cvect:
    case scm_tc7_vector:
    case scm_tc7_wvect:
    case scm_tc7_svect:
#ifdef HAVE_LONG_LONGS
    case scm_tc7_llvect:
#endif
      return SCM_MAKINUM (SCM_LENGTH (v));
    }
}
#undef FUNC_NAME

SCM_DEFINE (scm_array_p, "array?", 1, 1, 0,
           (SCM v, SCM prot),
	    "Returns @code{#t} if the @var{obj} is an array, and @code{#f} if not.\n\n"
	    "The @var{prototype} argument is used with uniform arrays and is described\n"
	    "elsewhere.")
#define FUNC_NAME s_scm_array_p
{
  int nprot;
  int enclosed;
  nprot = SCM_UNBNDP (prot);
  enclosed = 0;
  if (SCM_IMP (v))
    return SCM_BOOL_F;

  while (SCM_TYP7 (v) == scm_tc7_smob)
    {
      if (!SCM_ARRAYP (v))
	return SCM_BOOL_F;
      if (nprot)
	return SCM_BOOL_T;
      if (enclosed++)
	return SCM_BOOL_F;
      v = SCM_ARRAY_V (v);
     }
  if (nprot)
    return SCM_BOOL(nprot);
  else
    {
      int protp = 0;
      
      switch (SCM_TYP7 (v))
 	{
 	case scm_tc7_bvect:
 	  protp = (SCM_EQ_P (prot, SCM_BOOL_T));
 	case scm_tc7_string:
 	  protp = SCM_CHARP(prot) && (SCM_CHAR (prot) != '\0');
 	case scm_tc7_byvect:
 	  protp = SCM_EQ_P (prot, SCM_MAKE_CHAR ('\0'));
 	case scm_tc7_uvect:
 	  protp = SCM_INUMP(prot) && SCM_INUM(prot)>0;
 	case scm_tc7_ivect:
 	  protp = SCM_INUMP(prot) && SCM_INUM(prot)<=0;
          
 	case scm_tc7_svect:
 	  protp = SCM_SYMBOLP (prot)
 	    && (1 == SCM_LENGTH (prot))
 	    && ('s' == SCM_CHARS (prot)[0]);
#ifdef HAVE_LONG_LONGS
 	case scm_tc7_llvect:
 	  protp = SCM_SYMBOLP (prot)
 	    && (1 == SCM_LENGTH (prot))
 	    && ('s' == SCM_CHARS (prot)[0]);
#endif
 	case scm_tc7_fvect:
 	  protp = singp (prot);
 	case scm_tc7_dvect:
 	  protp = SCM_REALP(prot);
 	case scm_tc7_cvect:
 	  protp = SCM_COMPLEXP(prot);
 	case scm_tc7_vector:
 	case scm_tc7_wvect:
 	  protp = SCM_NULLP(prot);
 	default:
 	  /* no default */
 	  ;
 	}
      return SCM_BOOL(protp);
    }
}
#undef FUNC_NAME


SCM_DEFINE (scm_array_rank, "array-rank", 1, 0, 0, 
           (SCM ra),
	    "Returns the number of dimensions of @var{obj}.  If @var{obj} is not an\n"
	    "array, @code{0} is returned.")
#define FUNC_NAME s_scm_array_rank
{
  if (SCM_IMP (ra))
    return SCM_INUM0;
  switch (SCM_TYP7 (ra))
    {
    default:
      return SCM_INUM0;
    case scm_tc7_string:
    case scm_tc7_vector:
    case scm_tc7_wvect:
    case scm_tc7_byvect:
    case scm_tc7_uvect:
    case scm_tc7_ivect:
    case scm_tc7_fvect:
    case scm_tc7_cvect:
    case scm_tc7_dvect:
#ifdef HAVE_LONG_LONGS
    case scm_tc7_llvect:
#endif
    case scm_tc7_svect:
      return SCM_MAKINUM (1L);
    case scm_tc7_smob:
      if (SCM_ARRAYP (ra))
	return SCM_MAKINUM (SCM_ARRAY_NDIM (ra));
      return SCM_INUM0;
    }
}
#undef FUNC_NAME


SCM_DEFINE (scm_array_dimensions, "array-dimensions", 1, 0, 0, 
           (SCM ra),
	    "@code{Array-dimensions} is similar to @code{array-shape} but replaces\n"
	    "elements with a @code{0} minimum with one greater than the maximum. So:\n"
	    "@example\n"
	    "(array-dimensions (make-array 'foo '(-1 3) 5)) @result{} ((-1 3) 5)\n"
	    "@end example")
#define FUNC_NAME s_scm_array_dimensions
{
  SCM res = SCM_EOL;
  scm_sizet k;
  scm_array_dim *s;
  if (SCM_IMP (ra))
    return SCM_BOOL_F;
  switch (SCM_TYP7 (ra))
    {
    default:
      return SCM_BOOL_F;
    case scm_tc7_string:
    case scm_tc7_vector:
    case scm_tc7_wvect:
    case scm_tc7_bvect:
    case scm_tc7_byvect:
    case scm_tc7_uvect:
    case scm_tc7_ivect:
    case scm_tc7_fvect:
    case scm_tc7_cvect:
    case scm_tc7_dvect:
    case scm_tc7_svect:
#ifdef HAVE_LONG_LONGS
    case scm_tc7_llvect:
#endif
      return scm_cons (SCM_MAKINUM (SCM_LENGTH (ra)), SCM_EOL);
    case scm_tc7_smob:
      if (!SCM_ARRAYP (ra))
	return SCM_BOOL_F;
      k = SCM_ARRAY_NDIM (ra);
      s = SCM_ARRAY_DIMS (ra);
      while (k--)
	res = scm_cons (s[k].lbnd
			? scm_cons2 (SCM_MAKINUM (s[k].lbnd),
				     SCM_MAKINUM (s[k].ubnd),
				     SCM_EOL)
			: SCM_MAKINUM (1 + s[k].ubnd),
			res);
      return res;
    }
}
#undef FUNC_NAME


SCM_DEFINE (scm_shared_array_root, "shared-array-root", 1, 0, 0, 
           (SCM ra),
	    "Return the root vector of a shared array.")
#define FUNC_NAME s_scm_shared_array_root
{
  SCM_ASSERT (SCM_ARRAYP (ra), ra, SCM_ARG1, FUNC_NAME);
  return SCM_ARRAY_V (ra);
}
#undef FUNC_NAME


SCM_DEFINE (scm_shared_array_offset, "shared-array-offset", 1, 0, 0, 
           (SCM ra),
	    "Return the root vector index of the first element in the array.")
#define FUNC_NAME s_scm_shared_array_offset
{
  SCM_ASSERT (SCM_ARRAYP (ra), ra, SCM_ARG1, FUNC_NAME);
  return SCM_MAKINUM (SCM_ARRAY_BASE (ra));
}
#undef FUNC_NAME


SCM_DEFINE (scm_shared_array_increments, "shared-array-increments", 1, 0, 0, 
           (SCM ra),
	    "For each dimension, return the distance between elements in the root vector.")
#define FUNC_NAME s_scm_shared_array_increments
{
  SCM res = SCM_EOL;
  scm_sizet k;
  scm_array_dim *s;
  SCM_ASSERT (SCM_ARRAYP (ra), ra, SCM_ARG1, FUNC_NAME);
  k = SCM_ARRAY_NDIM (ra);
  s = SCM_ARRAY_DIMS (ra);
  while (k--)
    res = scm_cons (SCM_MAKINUM (s[k].inc), res);
  return res;
}
#undef FUNC_NAME


static char s_bad_ind[] = "Bad scm_array index";


long 
scm_aind (SCM ra, SCM args, const char *what)
{
  SCM ind;
  register long j;
  register scm_sizet pos = SCM_ARRAY_BASE (ra);
  register scm_sizet k = SCM_ARRAY_NDIM (ra);
  scm_array_dim *s = SCM_ARRAY_DIMS (ra);
  if (SCM_INUMP (args))
    {
      SCM_ASSERT (1 == k, scm_makfrom0str (what), SCM_WNA, NULL);
      return pos + (SCM_INUM (args) - s->lbnd) * (s->inc);
    }
  while (k && SCM_NIMP (args))
    {
      ind = SCM_CAR (args);
      args = SCM_CDR (args);
      SCM_ASSERT (SCM_INUMP (ind), ind, s_bad_ind, what);
      j = SCM_INUM (ind);
      if (j < s->lbnd || j > s->ubnd)
	scm_out_of_range (what, ind);
      pos += (j - s->lbnd) * (s->inc);
      k--;
      s++;
    }
  SCM_ASSERT (0 == k && SCM_NULLP (args), scm_makfrom0str (what), SCM_WNA,
	      NULL);
  return pos;
}


SCM 
scm_make_ra (int ndim)
{
  SCM ra;
  SCM_NEWCELL (ra);
  SCM_DEFER_INTS;
  SCM_NEWSMOB(ra, ((long) ndim << 17) + scm_tc16_array,
              scm_must_malloc ((long) (sizeof (scm_array) + ndim * sizeof (scm_array_dim)),
			       "array"));
  SCM_ARRAY_V (ra) = scm_nullvect;
  SCM_ALLOW_INTS;
  return ra;
}

static char s_bad_spec[] = "Bad scm_array dimension";
/* Increments will still need to be set. */


SCM 
scm_shap2ra (SCM args, const char *what)
{
  scm_array_dim *s;
  SCM ra, spec, sp;
  int ndim = scm_ilength (args);
  SCM_ASSERT (0 <= ndim, args, s_bad_spec, what);
  ra = scm_make_ra (ndim);
  SCM_ARRAY_BASE (ra) = 0;
  s = SCM_ARRAY_DIMS (ra);
  for (; SCM_NIMP (args); s++, args = SCM_CDR (args))
    {
      spec = SCM_CAR (args);
      if (SCM_IMP (spec))

	{
	  SCM_ASSERT (SCM_INUMP (spec) && SCM_INUM (spec) >= 0, spec,
		      s_bad_spec, what);
	  s->lbnd = 0;
	  s->ubnd = SCM_INUM (spec) - 1;
	  s->inc = 1;
	}
      else
	{
	  SCM_ASSERT (SCM_CONSP (spec) && SCM_INUMP (SCM_CAR (spec)), spec,
		      s_bad_spec, what);
	  s->lbnd = SCM_INUM (SCM_CAR (spec));
	  sp = SCM_CDR (spec);
	  SCM_ASSERT (SCM_CONSP (sp)
		      && SCM_INUMP (SCM_CAR (sp)) && SCM_NULLP (SCM_CDR (sp)),
		      spec, s_bad_spec, what);
	  s->ubnd = SCM_INUM (SCM_CAR (sp));
	  s->inc = 1;
	}
    }
  return ra;
}

SCM_DEFINE (scm_dimensions_to_uniform_array, "dimensions->uniform-array", 2, 1, 0,
           (SCM dims, SCM prot, SCM fill),
	    "@deffnx primitive make-uniform-vector length prototype [fill]\n"
	    "Creates and returns a uniform array or vector of type corresponding to\n"
	    "@var{prototype} with dimensions @var{dims} or length @var{length}.  If\n"
	    "@var{fill} is supplied, it's used to fill the array, otherwise \n"
	    "@var{prototype} is used.")
#define FUNC_NAME s_scm_dimensions_to_uniform_array
{
  scm_sizet k, vlen = 1;
  long rlen = 1;
  scm_array_dim *s;
  SCM ra;
  if (SCM_INUMP (dims))
    {
      if (SCM_INUM (dims) < SCM_LENGTH_MAX)
	{
	  SCM answer = scm_make_uve (SCM_INUM (dims), prot);

	  if (!SCM_UNBNDP (fill))
	    scm_array_fill_x (answer, fill);
	  else if (SCM_SYMBOLP (prot))
	    scm_array_fill_x (answer, SCM_MAKINUM (0));
	  else
	    scm_array_fill_x (answer, prot);
	  return answer;
	}
    else
      dims = scm_cons (dims, SCM_EOL);
    }
  SCM_ASSERT (SCM_NULLP (dims) || SCM_CONSP (dims),
              dims, SCM_ARG1, FUNC_NAME);
  ra = scm_shap2ra (dims, FUNC_NAME);
  SCM_SETOR_CAR (ra, SCM_ARRAY_CONTIGUOUS);
  s = SCM_ARRAY_DIMS (ra);
  k = SCM_ARRAY_NDIM (ra);
  while (k--)
    {
      s[k].inc = (rlen > 0 ? rlen : 0);
      rlen = (s[k].ubnd - s[k].lbnd + 1) * s[k].inc;
      vlen *= (s[k].ubnd - s[k].lbnd + 1);
    }
  if (rlen < SCM_LENGTH_MAX)
    SCM_ARRAY_V (ra) = scm_make_uve ((rlen > 0 ? rlen : 0L), prot);
  else
    {
      scm_sizet bit;
      switch (SCM_TYP7 (scm_make_uve (0L, prot)))
	{
	default:
	  bit = SCM_LONG_BIT;
	  break;
	case scm_tc7_bvect:
	  bit = 1;
	  break;
	case scm_tc7_string:
	  bit = SCM_CHAR_BIT;
	  break;
	case scm_tc7_fvect:
	  bit = sizeof (float) * SCM_CHAR_BIT / sizeof (char);
	  break;
	case scm_tc7_dvect:
	  bit = sizeof (double) * SCM_CHAR_BIT / sizeof (char);
	  break;
	case scm_tc7_cvect:
	  bit = 2 * sizeof (double) * SCM_CHAR_BIT / sizeof (char);
	  break;
	}
      SCM_ARRAY_BASE (ra) = (SCM_LONG_BIT + bit - 1) / bit;
      rlen += SCM_ARRAY_BASE (ra);
      SCM_ARRAY_V (ra) = scm_make_uve (rlen, prot);
      *((long *) SCM_VELTS (SCM_ARRAY_V (ra))) = rlen;
    }
  if (!SCM_UNBNDP (fill))
    {
      scm_array_fill_x (ra, fill);
    }
  else if (SCM_SYMBOLP (prot))
    scm_array_fill_x (ra, SCM_MAKINUM (0));
  else
    scm_array_fill_x (ra, prot);
  if (1 == SCM_ARRAY_NDIM (ra) && 0 == SCM_ARRAY_BASE (ra))
    if (s->ubnd < s->lbnd || (0 == s->lbnd && 1 == s->inc))
      return SCM_ARRAY_V (ra);
  return ra;
}
#undef FUNC_NAME


void 
scm_ra_set_contp (SCM ra)
{
  scm_sizet k = SCM_ARRAY_NDIM (ra);
  if (k)
    {
      long inc = SCM_ARRAY_DIMS (ra)[k - 1].inc;
      while (k--)
	{
	  if (inc != SCM_ARRAY_DIMS (ra)[k].inc)
	    {
	      SCM_SETAND_CAR (ra, ~SCM_ARRAY_CONTIGUOUS);
	      return;
	    }
	  inc *= (SCM_ARRAY_DIMS (ra)[k].ubnd 
		  - SCM_ARRAY_DIMS (ra)[k].lbnd + 1);
	}
    }
  SCM_SETOR_CAR (ra, SCM_ARRAY_CONTIGUOUS);
}


SCM_DEFINE (scm_make_shared_array, "make-shared-array", 2, 0, 1,
           (SCM oldra, SCM mapfunc, SCM dims),
	    "@code{make-shared-array} can be used to create shared subarrays of other\n"
	    "arrays.  The @var{mapper} is a function that translates coordinates in\n"
	    "the new array into coordinates in the old array.  A @var{mapper} must be\n"
	    "linear, and its range must stay within the bounds of the old array, but\n"
	    "it can be otherwise arbitrary.  A simple example:\n"
	    "@example\n"
	    "(define fred (make-array #f 8 8))\n"
	    "(define freds-diagonal\n"
	    "  (make-shared-array fred (lambda (i) (list i i)) 8))\n"
	    "(array-set! freds-diagonal 'foo 3)\n"
	    "(array-ref fred 3 3) @result{} foo\n"
	    "(define freds-center\n"
	    "  (make-shared-array fred (lambda (i j) (list (+ 3 i) (+ 3 j))) 2 2))\n"
	    "(array-ref freds-center 0 0) @result{} foo\n"
	    "@end example")
#define FUNC_NAME s_scm_make_shared_array
{
  SCM ra;
  SCM inds, indptr;
  SCM imap;
  scm_sizet i, k;
  long old_min, new_min, old_max, new_max;
  scm_array_dim *s;
  SCM_VALIDATE_ARRAY (1,oldra);
  SCM_VALIDATE_PROC (2,mapfunc);
  ra = scm_shap2ra (dims, FUNC_NAME);
  if (SCM_ARRAYP (oldra))
    {
      SCM_ARRAY_V (ra) = SCM_ARRAY_V (oldra);
      old_min = old_max = SCM_ARRAY_BASE (oldra);
      s = SCM_ARRAY_DIMS (oldra);
      k = SCM_ARRAY_NDIM (oldra);
      while (k--)
	{
	  if (s[k].inc > 0)
	    old_max += (s[k].ubnd - s[k].lbnd) * s[k].inc;
	  else
	    old_min += (s[k].ubnd - s[k].lbnd) * s[k].inc;
	}
    }
  else
    {
      SCM_ARRAY_V (ra) = oldra;
      old_min = 0;
      old_max = (long) SCM_LENGTH (oldra) - 1;
    }
  inds = SCM_EOL;
  s = SCM_ARRAY_DIMS (ra);
  for (k = 0; k < SCM_ARRAY_NDIM (ra); k++)
    {
      inds = scm_cons (SCM_MAKINUM (s[k].lbnd), inds);
      if (s[k].ubnd < s[k].lbnd)
	{
	  if (1 == SCM_ARRAY_NDIM (ra))
	    ra = scm_make_uve (0L, scm_array_prototype (ra));
	  else
	    SCM_ARRAY_V (ra) = scm_make_uve (0L, scm_array_prototype (ra));
	  return ra;
	}
    }
  imap = scm_apply (mapfunc, scm_reverse (inds), SCM_EOL);
  if (SCM_ARRAYP (oldra))
      i = (scm_sizet) scm_aind (oldra, imap, FUNC_NAME);
  else
    {
      if (SCM_NINUMP (imap))

	{
	  SCM_ASSERT (1 == scm_ilength (imap) && SCM_INUMP (SCM_CAR (imap)),
		  imap, s_bad_ind, FUNC_NAME);
	  imap = SCM_CAR (imap);
	}
      i = SCM_INUM (imap);
    }
  SCM_ARRAY_BASE (ra) = new_min = new_max = i;
  indptr = inds;
  k = SCM_ARRAY_NDIM (ra);
  while (k--)
    {
      if (s[k].ubnd > s[k].lbnd)
	{
	  SCM_SETCAR (indptr, SCM_MAKINUM (SCM_INUM (SCM_CAR (indptr)) + 1));
	  imap = scm_apply (mapfunc, scm_reverse (inds), SCM_EOL);
	  if (SCM_ARRAYP (oldra))

	      s[k].inc = scm_aind (oldra, imap, FUNC_NAME) - i;
	  else
	    {
	      if (SCM_NINUMP (imap))

		{
		  SCM_ASSERT (1 == scm_ilength (imap) && SCM_INUMP (SCM_CAR (imap)),
                              imap, s_bad_ind, FUNC_NAME);
		  imap = SCM_CAR (imap);
		}
	      s[k].inc = (long) SCM_INUM (imap) - i;
	    }
	  i += s[k].inc;
	  if (s[k].inc > 0)
	    new_max += (s[k].ubnd - s[k].lbnd) * s[k].inc;
	  else
	    new_min += (s[k].ubnd - s[k].lbnd) * s[k].inc;
	}
      else
	s[k].inc = new_max - new_min + 1;	/* contiguous by default */
      indptr = SCM_CDR (indptr);
    }
  SCM_ASSERT (old_min <= new_min && old_max >= new_max, SCM_UNDEFINED,
	  "mapping out of range", FUNC_NAME);
  if (1 == SCM_ARRAY_NDIM (ra) && 0 == SCM_ARRAY_BASE (ra))
    {
      if (1 == s->inc && 0 == s->lbnd
	  && SCM_LENGTH (SCM_ARRAY_V (ra)) == 1 + s->ubnd)
	return SCM_ARRAY_V (ra);
      if (s->ubnd < s->lbnd)
	return scm_make_uve (0L, scm_array_prototype (ra));
    }
  scm_ra_set_contp (ra);
  return ra;
}
#undef FUNC_NAME


/* args are RA . DIMS */
SCM_DEFINE (scm_transpose_array, "transpose-array", 1, 0, 1, 
           (SCM ra, SCM args),
	    "Returns an array sharing contents with @var{array}, but with dimensions\n"
	    "arranged in a different order.  There must be one @var{dim} argument for\n"
	    "each dimension of @var{array}.  @var{dim0}, @var{dim1}, @dots{} should\n"
	    "be integers between 0 and the rank of the array to be returned.  Each\n"
	    "integer in that range must appear at least once in the argument list.\n\n"
	    "The values of @var{dim0}, @var{dim1}, @dots{} correspond to dimensions\n"
	    "in the array to be returned, their positions in the argument list to\n"
	    "dimensions of @var{array}.  Several @var{dim}s may have the same value,\n"
	    "in which case the returned array will have smaller rank than\n"
	    "@var{array}.\n\n"
	    "examples:\n"
	    "@example\n"
	    "(transpose-array '#2((a b) (c d)) 1 0) @result{} #2((a c) (b d))\n"
	    "(transpose-array '#2((a b) (c d)) 0 0) @result{} #1(a d)\n"
	    "(transpose-array '#3(((a b c) (d e f)) ((1 2 3) (4 5 6))) 1 1 0) @result{}\n"
	    "                #2((a 4) (b 5) (c 6))\n"
	    "@end example")
#define FUNC_NAME s_scm_transpose_array
{
  SCM res, vargs, *ve = &vargs;
  scm_array_dim *s, *r;
  int ndim, i, k;

  SCM_ASSERT (SCM_NIMP (ra), ra, SCM_ARG1, FUNC_NAME);
  switch (SCM_TYP7 (ra))
    {
    default:
    badarg:SCM_WTA (1,ra);
    case scm_tc7_bvect:
    case scm_tc7_string:
    case scm_tc7_byvect:
    case scm_tc7_uvect:
    case scm_tc7_ivect:
    case scm_tc7_fvect:
    case scm_tc7_dvect:
    case scm_tc7_cvect:
    case scm_tc7_svect:
#ifdef HAVE_LONG_LONGS
    case scm_tc7_llvect:
#endif
      SCM_ASSERT (!SCM_NULLP (args) && SCM_NULLP (SCM_CDR (args)),
		  scm_makfrom0str (FUNC_NAME), SCM_WNA, NULL);
      SCM_ASSERT (SCM_INUMP (SCM_CAR (args)), SCM_CAR (args), SCM_ARG2,
		  FUNC_NAME);
      SCM_ASSERT_RANGE (SCM_ARG2, SCM_CAR (args), 
			SCM_EQ_P (SCM_INUM0, SCM_CAR (args)));
      return ra;
    case scm_tc7_smob:
      SCM_ASRTGO (SCM_ARRAYP (ra), badarg);
      vargs = scm_vector (args);
      SCM_ASSERT (SCM_LENGTH (vargs) == SCM_ARRAY_NDIM (ra),
		  scm_makfrom0str (FUNC_NAME), SCM_WNA, NULL);
		  ve = SCM_VELTS (vargs);
      ndim = 0;
      for (k = 0; k < SCM_ARRAY_NDIM (ra); k++)
	{
	  SCM_ASSERT (SCM_INUMP (ve[k]), ve[k], (SCM_ARG2 + k),
		      FUNC_NAME);
	  i = SCM_INUM (ve[k]);
	  if (i < 0 || i >= SCM_ARRAY_NDIM (ra))
	    scm_out_of_range (FUNC_NAME, ve[k]);
	  if (ndim < i)
	    ndim = i;
	}
      ndim++;
      res = scm_make_ra (ndim);
      SCM_ARRAY_V (res) = SCM_ARRAY_V (ra);
      SCM_ARRAY_BASE (res) = SCM_ARRAY_BASE (ra);
      for (k = ndim; k--;)
	{
	  SCM_ARRAY_DIMS (res)[k].lbnd = 0;
	  SCM_ARRAY_DIMS (res)[k].ubnd = -1;
	}
      for (k = SCM_ARRAY_NDIM (ra); k--;)
	{
	  i = SCM_INUM (ve[k]);
	  s = &(SCM_ARRAY_DIMS (ra)[k]);
	  r = &(SCM_ARRAY_DIMS (res)[i]);
	  if (r->ubnd < r->lbnd)
	    {
	      r->lbnd = s->lbnd;
	      r->ubnd = s->ubnd;
	      r->inc = s->inc;
	      ndim--;
	    }
	  else
	    {
	      if (r->ubnd > s->ubnd)
		r->ubnd = s->ubnd;
	      if (r->lbnd < s->lbnd)
		{
		  SCM_ARRAY_BASE (res) += (s->lbnd - r->lbnd) * r->inc;
		  r->lbnd = s->lbnd;
		}
	      r->inc += s->inc;
	    }
	}
      SCM_ASSERT (ndim <= 0, args, "bad argument list", FUNC_NAME);
      scm_ra_set_contp (res);
      return res;
    }
}
#undef FUNC_NAME

/* args are RA . AXES */
SCM_DEFINE (scm_enclose_array, "enclose-array", 1, 0, 1, 
           (SCM ra, SCM axes),
	    "@var{dim0}, @var{dim1} @dots{} should be nonnegative integers less than\n"
	    "the rank of @var{array}.  @var{enclose-array} returns an array\n"
	    "resembling an array of shared arrays.  The dimensions of each shared\n"
	    "array are the same as the @var{dim}th dimensions of the original array,\n"
	    "the dimensions of the outer array are the same as those of the original\n"
	    "array that did not match a @var{dim}.\n\n"
	    "An enclosed array is not a general Scheme array.  Its elements may not\n"
	    "be set using @code{array-set!}.  Two references to the same element of\n"
	    "an enclosed array will be @code{equal?} but will not in general be\n"
	    "@code{eq?}.  The value returned by @var{array-prototype} when given an\n"
	    "enclosed array is unspecified.\n\n"
	    "examples:\n"
	    "@example\n"
	    "(enclose-array '#3(((a b c) (d e f)) ((1 2 3) (4 5 6))) 1) @result{}\n"
	    "   #<enclosed-array (#1(a d) #1(b e) #1(c f)) (#1(1 4) #1(2 5) #1(3 6))>\n\n"
	    "(enclose-array '#3(((a b c) (d e f)) ((1 2 3) (4 5 6))) 1 0) @result{}\n"
	    "   #<enclosed-array #2((a 1) (d 4)) #2((b 2) (e 5)) #2((c 3) (f 6))>\n"
	    "@end example")
#define FUNC_NAME s_scm_enclose_array
{
  SCM axv, res, ra_inr;
  scm_array_dim vdim, *s = &vdim;
  int ndim, j, k, ninr, noutr;

  if (SCM_NULLP (axes))
      axes = scm_cons ((SCM_ARRAYP (ra) ? SCM_MAKINUM (SCM_ARRAY_NDIM (ra) - 1) : SCM_INUM0), SCM_EOL);
  ninr = scm_ilength (axes);
  SCM_ASSERT (0 <= ninr, scm_makfrom0str (FUNC_NAME), SCM_WNA, NULL);
  ra_inr = scm_make_ra (ninr);
  SCM_ASRTGO (SCM_NIMP (ra), badarg1);
  switch SCM_TYP7
    (ra)
    {
    default:
    badarg1:SCM_WTA (1,ra);
    case scm_tc7_string:
    case scm_tc7_bvect:
    case scm_tc7_byvect:
    case scm_tc7_uvect:
    case scm_tc7_ivect:
    case scm_tc7_fvect:
    case scm_tc7_dvect:
    case scm_tc7_cvect:
    case scm_tc7_vector:
    case scm_tc7_wvect:
    case scm_tc7_svect:
#ifdef HAVE_LONG_LONGS
    case scm_tc7_llvect:
#endif
      s->lbnd = 0;
      s->ubnd = SCM_LENGTH (ra) - 1;
      s->inc = 1;
      SCM_ARRAY_V (ra_inr) = ra;
      SCM_ARRAY_BASE (ra_inr) = 0;
      ndim = 1;
      break;
    case scm_tc7_smob:
      SCM_ASRTGO (SCM_ARRAYP (ra), badarg1);
      s = SCM_ARRAY_DIMS (ra);
      SCM_ARRAY_V (ra_inr) = SCM_ARRAY_V (ra);
      SCM_ARRAY_BASE (ra_inr) = SCM_ARRAY_BASE (ra);
      ndim = SCM_ARRAY_NDIM (ra);
      break;
    }
  noutr = ndim - ninr;
  axv = scm_make_string (SCM_MAKINUM (ndim), SCM_MAKE_CHAR (0));
  SCM_ASSERT (0 <= noutr, scm_makfrom0str (FUNC_NAME), SCM_WNA, NULL);
  res = scm_make_ra (noutr);
  SCM_ARRAY_BASE (res) = SCM_ARRAY_BASE (ra_inr);
  SCM_ARRAY_V (res) = ra_inr;
  for (k = 0; k < ninr; k++, axes = SCM_CDR (axes))
    {
      SCM_ASSERT (SCM_INUMP (SCM_CAR (axes)), SCM_CAR (axes), "bad axis", FUNC_NAME);
      j = SCM_INUM (SCM_CAR (axes));
      SCM_ARRAY_DIMS (ra_inr)[k].lbnd = s[j].lbnd;
      SCM_ARRAY_DIMS (ra_inr)[k].ubnd = s[j].ubnd;
      SCM_ARRAY_DIMS (ra_inr)[k].inc = s[j].inc;
      SCM_CHARS (axv)[j] = 1;
    }
  for (j = 0, k = 0; k < noutr; k++, j++)
    {
      while (SCM_CHARS (axv)[j])
	j++;
      SCM_ARRAY_DIMS (res)[k].lbnd = s[j].lbnd;
      SCM_ARRAY_DIMS (res)[k].ubnd = s[j].ubnd;
      SCM_ARRAY_DIMS (res)[k].inc = s[j].inc;
    }
  scm_ra_set_contp (ra_inr);
  scm_ra_set_contp (res);
  return res;
}
#undef FUNC_NAME


SCM_DEFINE (scm_array_in_bounds_p, "array-in-bounds?", 1, 0, 1, 
           (SCM v, SCM args),
	    "Returns @code{#t} if its arguments would be acceptable to array-ref.")
#define FUNC_NAME s_scm_array_in_bounds_p
{
  SCM ind = SCM_EOL;
  long pos = 0;
  register scm_sizet k;
  register long j;
  scm_array_dim *s;

  SCM_ASRTGO (SCM_NIMP (v), badarg1);
  if (SCM_NIMP (args))

    {
      ind = SCM_CAR (args);
      args = SCM_CDR (args);
      SCM_ASSERT (SCM_INUMP (ind), ind, SCM_ARG2, FUNC_NAME);
      pos = SCM_INUM (ind);
    }
tail:
  switch SCM_TYP7
    (v)
    {
    default:
    badarg1:SCM_WTA (1,v);
    wna: scm_wrong_num_args (scm_makfrom0str (FUNC_NAME));
    case scm_tc7_smob:
      k = SCM_ARRAY_NDIM (v);
      s = SCM_ARRAY_DIMS (v);
      pos = SCM_ARRAY_BASE (v);
      if (!k)
	{
	  SCM_ASRTGO (SCM_NULLP (ind), wna);
	  ind = SCM_INUM0;
	}
      else
	while (!0)
	  {
	    j = SCM_INUM (ind);
	    if (!(j >= (s->lbnd) && j <= (s->ubnd)))
	      {
		SCM_ASRTGO (--k == scm_ilength (args), wna);
		return SCM_BOOL_F;
	      }
	    pos += (j - s->lbnd) * (s->inc);
	    if (!(--k && SCM_NIMP (args)))
	      break;
	    ind = SCM_CAR (args);
	    args = SCM_CDR (args);
	    s++;
	    SCM_ASSERT (SCM_INUMP (ind), ind, s_bad_ind, FUNC_NAME);
	  }
      SCM_ASRTGO (0 == k, wna);
      v = SCM_ARRAY_V (v);
      goto tail;
    case scm_tc7_bvect:
    case scm_tc7_string:
    case scm_tc7_byvect:
    case scm_tc7_uvect:
    case scm_tc7_ivect:
    case scm_tc7_fvect:
    case scm_tc7_dvect:
    case scm_tc7_cvect:
    case scm_tc7_svect:
#ifdef HAVE_LONG_LONGS
    case scm_tc7_llvect:
#endif
    case scm_tc7_vector:
    case scm_tc7_wvect:
      SCM_ASRTGO (SCM_NULLP (args) && SCM_INUMP (ind), wna);
      return SCM_BOOL(pos >= 0 && pos < SCM_LENGTH (v));
    }
}
#undef FUNC_NAME


SCM_REGISTER_PROC(s_array_ref, "array-ref", 1, 0, 1, scm_uniform_vector_ref);


SCM_DEFINE (scm_uniform_vector_ref, "uniform-vector-ref", 2, 0, 0,
           (SCM v, SCM args),
	    "Returns the element at the @code{(index1, index2)} element in @var{array}.")
#define FUNC_NAME s_scm_uniform_vector_ref
{
  long pos;

  if (SCM_IMP (v))
    {
      SCM_ASRTGO (SCM_NULLP (args), badarg);
      return v;
    }
  else if (SCM_ARRAYP (v))
    {
      pos = scm_aind (v, args, FUNC_NAME);
      v = SCM_ARRAY_V (v);
    }
  else
    {
      if (SCM_NIMP (args))

	{
	  SCM_ASSERT (SCM_CONSP (args) && SCM_INUMP (SCM_CAR (args)), args, SCM_ARG2, FUNC_NAME);
	  pos = SCM_INUM (SCM_CAR (args));
	  SCM_ASRTGO (SCM_NULLP (SCM_CDR (args)), wna);
	}
      else
	{
          SCM_VALIDATE_INUM (2,args);
	  pos = SCM_INUM (args);
	}
      SCM_ASRTGO (pos >= 0 && pos < SCM_LENGTH (v), outrng);
    }
  switch SCM_TYP7
    (v)
    {
    default:
      if (SCM_NULLP (args))
 return v;
    badarg:
      SCM_WTA (1,v);
      abort ();

    outrng:
      scm_out_of_range (FUNC_NAME, SCM_MAKINUM (pos));
    wna:
      scm_wrong_num_args (SCM_FUNC_NAME);
    case scm_tc7_smob:
      {				/* enclosed */
	int k = SCM_ARRAY_NDIM (v);
	SCM res = scm_make_ra (k);
	SCM_ARRAY_V (res) = SCM_ARRAY_V (v);
	SCM_ARRAY_BASE (res) = pos;
	while (k--)
	  {
	    SCM_ARRAY_DIMS (res)[k].lbnd = SCM_ARRAY_DIMS (v)[k].lbnd;
	    SCM_ARRAY_DIMS (res)[k].ubnd = SCM_ARRAY_DIMS (v)[k].ubnd;
	    SCM_ARRAY_DIMS (res)[k].inc = SCM_ARRAY_DIMS (v)[k].inc;
	  }
	return res;
      }
    case scm_tc7_bvect:
      if (SCM_BITVEC_REF (v, pos))
	return SCM_BOOL_T;
      else
	return SCM_BOOL_F;
    case scm_tc7_string:
      return SCM_MAKE_CHAR (SCM_UCHARS (v)[pos]);
    case scm_tc7_byvect:
      return SCM_MAKINUM (((char *)SCM_CHARS (v))[pos]);
  case scm_tc7_uvect:
    return scm_ulong2num (((unsigned long *) SCM_VELTS (v))[pos]);
  case scm_tc7_ivect:
    return scm_long2num(((signed long *) SCM_VELTS (v))[pos]);

    case scm_tc7_svect:
      return SCM_MAKINUM (((short *) SCM_CELL_WORD_1 (v))[pos]);
#ifdef HAVE_LONG_LONGS
    case scm_tc7_llvect:
      return scm_long_long2num (((long_long *) SCM_CELL_WORD_1 (v))[pos]);
#endif

    case scm_tc7_fvect:
      return scm_make_real (((float *) SCM_CELL_WORD_1 (v))[pos]);
    case scm_tc7_dvect:
      return scm_make_real (((double *) SCM_CELL_WORD_1 (v))[pos]);
    case scm_tc7_cvect:
      return scm_make_complex (((double *) SCM_CELL_WORD_1 (v))[2 * pos],
			       ((double *) SCM_CELL_WORD_1 (v))[2 * pos + 1]);
    case scm_tc7_vector:
    case scm_tc7_wvect:
      return SCM_VELTS (v)[pos];
    }
}
#undef FUNC_NAME

/* Internal version of scm_uniform_vector_ref for uves that does no error checking and
   tries to recycle conses.  (Make *sure* you want them recycled.) */

SCM 
scm_cvref (SCM v, scm_sizet pos, SCM last)
{
  switch SCM_TYP7 (v)
    {
    default:
      scm_wta (v, (char *) SCM_ARG1, "PROGRAMMING ERROR: scm_cvref");
    case scm_tc7_bvect:
      if (SCM_BITVEC_REF(v,pos))
	return SCM_BOOL_T;
      else
	return SCM_BOOL_F;
    case scm_tc7_string:
      return SCM_MAKE_CHAR (SCM_UCHARS (v)[pos]);
    case scm_tc7_byvect:
      return SCM_MAKINUM (((char *)SCM_CHARS (v))[pos]);
    case scm_tc7_uvect:
      return scm_ulong2num(((unsigned long *) SCM_VELTS (v))[pos]);
    case scm_tc7_ivect:
      return scm_long2num(((signed long *) SCM_VELTS (v))[pos]);
    case scm_tc7_svect:
      return SCM_MAKINUM (((short *) SCM_CELL_WORD_1 (v))[pos]);
#ifdef HAVE_LONG_LONGS
    case scm_tc7_llvect:
      return scm_long_long2num (((long_long *) SCM_CELL_WORD_1 (v))[pos]);
#endif
    case scm_tc7_fvect:
      if (SCM_NIMP (last) && !SCM_EQ_P (last, scm_flo0) && SCM_SLOPPY_REALP (last))
	{
	  SCM_REAL_VALUE (last) = ((float *) SCM_CELL_WORD_1 (v))[pos];
	  return last;
	}
      return scm_make_real (((float *) SCM_CELL_WORD_1 (v))[pos]);
    case scm_tc7_dvect:
      if (SCM_NIMP (last) && !SCM_EQ_P (last, scm_flo0) && SCM_SLOPPY_REALP (last))
	{
	  SCM_REAL_VALUE (last) = ((double *) SCM_CELL_WORD_1 (v))[pos];
	  return last;
	}
      return scm_make_real (((double *) SCM_CELL_WORD_1 (v))[pos]);
    case scm_tc7_cvect:
      if (SCM_NIMP (last) && SCM_SLOPPY_COMPLEXP (last))
	{
	  SCM_COMPLEX_REAL (last) = ((double *) SCM_CELL_WORD_1 (v))[2 * pos];
	  SCM_COMPLEX_IMAG (last) = ((double *) SCM_CELL_WORD_1 (v))[2 * pos + 1];
	  return last;
	}
      return scm_make_complex (((double *) SCM_CELL_WORD_1 (v))[2 * pos],
			       ((double *) SCM_CELL_WORD_1 (v))[2 * pos + 1]);
    case scm_tc7_vector:
    case scm_tc7_wvect:
      return SCM_VELTS (v)[pos];
    case scm_tc7_smob:
      {				/* enclosed scm_array */
	int k = SCM_ARRAY_NDIM (v);
	SCM res = scm_make_ra (k);
	SCM_ARRAY_V (res) = SCM_ARRAY_V (v);
	SCM_ARRAY_BASE (res) = pos;
	while (k--)
	  {
	    SCM_ARRAY_DIMS (res)[k].ubnd = SCM_ARRAY_DIMS (v)[k].ubnd;
	    SCM_ARRAY_DIMS (res)[k].lbnd = SCM_ARRAY_DIMS (v)[k].lbnd;
	    SCM_ARRAY_DIMS (res)[k].inc = SCM_ARRAY_DIMS (v)[k].inc;
	  }
	return res;
      }
    }
}

SCM_REGISTER_PROC(s_uniform_array_set1_x, "uniform-array-set1!", 3, 0, 0, scm_array_set_x);


/* Note that args may be a list or an immediate object, depending which
   PROC is used (and it's called from C too).  */
SCM_DEFINE (scm_array_set_x, "array-set!", 2, 0, 1, 
           (SCM v, SCM obj, SCM args),
	    "Sets the element at the @code{(index1, index2)} element in @var{array} to\n"
	    "@var{new-value}.  The value returned by array-set! is unspecified.")
#define FUNC_NAME s_scm_array_set_x           
{
  long pos = 0;
  SCM_ASRTGO (SCM_NIMP (v), badarg1);
  if (SCM_ARRAYP (v))
    {
      pos = scm_aind (v, args, FUNC_NAME);
      v = SCM_ARRAY_V (v);
    }
  else
    {
      if (SCM_NIMP (args))
	{
	  SCM_ASSERT (SCM_CONSP(args) && SCM_INUMP (SCM_CAR (args)), args,
		 SCM_ARG3, FUNC_NAME);
	  SCM_ASRTGO (SCM_NULLP (SCM_CDR (args)), wna);
	  pos = SCM_INUM (SCM_CAR (args));
	}
      else
	{
          SCM_VALIDATE_INUM_COPY (3,args,pos);
	}
      SCM_ASRTGO (pos >= 0 && pos < SCM_LENGTH (v), outrng);
    }
  switch (SCM_TYP7 (v))
    {
    default: badarg1:
      SCM_WTA (1,v);
      abort ();
    outrng:
      scm_out_of_range (FUNC_NAME, SCM_MAKINUM (pos));
    wna:
      scm_wrong_num_args (SCM_FUNC_NAME);
    case scm_tc7_smob:		/* enclosed */
      goto badarg1;
    case scm_tc7_bvect:
      if (SCM_FALSEP (obj))
	SCM_BITVEC_CLR(v,pos);
      else if (SCM_EQ_P (obj, SCM_BOOL_T))
	SCM_BITVEC_SET(v,pos);
      else
      badobj:SCM_WTA (2,obj);
      break;
    case scm_tc7_string:
      SCM_ASRTGO (SCM_CHARP (obj), badobj);
      SCM_UCHARS (v)[pos] = SCM_CHAR (obj);
      break;
    case scm_tc7_byvect:
      if (SCM_CHARP (obj))
	obj = SCM_MAKINUM ((char) SCM_CHAR (obj));
      SCM_ASRTGO (SCM_INUMP (obj), badobj);
      ((char *)SCM_CHARS (v))[pos] = SCM_INUM (obj);
      break;
    case scm_tc7_uvect:
      SCM_VELTS(v)[pos] = SCM_PACK (scm_num2ulong(obj, (char *)SCM_ARG2, FUNC_NAME));
      break;
    case scm_tc7_ivect:
      SCM_VELTS(v)[pos] = SCM_PACK (scm_num2long(obj, (char *)SCM_ARG2, FUNC_NAME));
      break;
    case scm_tc7_svect:
      SCM_ASRTGO (SCM_INUMP (obj), badobj);
      ((short *) SCM_CELL_WORD_1 (v))[pos] = SCM_INUM (obj);
      break;
#ifdef HAVE_LONG_LONGS
    case scm_tc7_llvect:
      ((long_long *) SCM_CELL_WORD_1 (v))[pos] = scm_num2long_long (obj, (char *)SCM_ARG2, FUNC_NAME);
      break;
#endif


    case scm_tc7_fvect:
      ((float *) SCM_CELL_WORD_1 (v))[pos] = (float) scm_num2dbl (obj, FUNC_NAME);
      break;
    case scm_tc7_dvect:
      ((double *) SCM_CELL_WORD_1 (v))[pos] = scm_num2dbl (obj, FUNC_NAME);
      break;
    case scm_tc7_cvect:
      SCM_ASRTGO (SCM_INEXACTP (obj), badobj);
      if (SCM_REALP (obj)) {
	((double *) SCM_CELL_WORD_1 (v))[2 * pos] = SCM_REAL_VALUE (obj);
	((double *) SCM_CELL_WORD_1 (v))[2 * pos + 1] = 0.0;
      } else {
	((double *) SCM_CELL_WORD_1 (v))[2 * pos] = SCM_COMPLEX_REAL (obj);
	((double *) SCM_CELL_WORD_1 (v))[2 * pos + 1] = SCM_COMPLEX_IMAG (obj);
      }
      break;
    case scm_tc7_vector:
    case scm_tc7_wvect:
      SCM_VELTS (v)[pos] = obj;
      break;
    }
  return SCM_UNSPECIFIED;
}
#undef FUNC_NAME

/* attempts to unroll an array into a one-dimensional array.
   returns the unrolled array or #f if it can't be done.  */
  /* if strict is not SCM_UNDEFINED, return #f if returned array
		     wouldn't have contiguous elements.  */
SCM_DEFINE (scm_array_contents, "array-contents", 1, 1, 0,
           (SCM ra, SCM strict),
	    "@deffnx primitive array-contents array strict\n"
	    "If @var{array} may be @dfn{unrolled} into a one dimensional shared array\n"
	    "without changing their order (last subscript changing fastest), then\n"
	    "@code{array-contents} returns that shared array, otherwise it returns\n"
	    "@code{#f}.  All arrays made by @var{make-array} and\n"
	    "@var{make-uniform-array} may be unrolled, some arrays made by\n"
	    "@var{make-shared-array} may not be.\n\n"
	    "If the optional argument @var{strict} is provided, a shared array will\n"
	    "be returned only if its elements are stored internally contiguous in\n"
	    "memory.")
#define FUNC_NAME s_scm_array_contents
{
  SCM sra;
  if (SCM_IMP (ra))
    return SCM_BOOL_F;
  switch SCM_TYP7 (ra)
    {
    default:
      return SCM_BOOL_F;
    case scm_tc7_vector:
    case scm_tc7_wvect:
    case scm_tc7_string:
    case scm_tc7_bvect:
    case scm_tc7_byvect:
    case scm_tc7_uvect:
    case scm_tc7_ivect:
    case scm_tc7_fvect:
    case scm_tc7_dvect:
    case scm_tc7_cvect:
    case scm_tc7_svect:
#ifdef HAVE_LONG_LONGS
    case scm_tc7_llvect:
#endif
      return ra;
    case scm_tc7_smob:
      {
	scm_sizet k, ndim = SCM_ARRAY_NDIM (ra), len = 1;
	if (!SCM_ARRAYP (ra) || !SCM_ARRAY_CONTP (ra))
	  return SCM_BOOL_F;
	for (k = 0; k < ndim; k++)
	  len *= SCM_ARRAY_DIMS (ra)[k].ubnd - SCM_ARRAY_DIMS (ra)[k].lbnd + 1;
	if (!SCM_UNBNDP (strict))
	  {
	    if (ndim && (1 != SCM_ARRAY_DIMS (ra)[ndim - 1].inc))
	      return SCM_BOOL_F;
	    if (scm_tc7_bvect == SCM_TYP7 (SCM_ARRAY_V (ra)))
	      {
		if (len != SCM_LENGTH (SCM_ARRAY_V (ra)) ||
		    SCM_ARRAY_BASE (ra) % SCM_LONG_BIT ||
		    len % SCM_LONG_BIT)
		  return SCM_BOOL_F;
	      }
	  }
	if ((len == SCM_LENGTH (SCM_ARRAY_V (ra))) && 0 == SCM_ARRAY_BASE (ra) && SCM_ARRAY_DIMS (ra)->inc)
	  return SCM_ARRAY_V (ra);
	sra = scm_make_ra (1);
	SCM_ARRAY_DIMS (sra)->lbnd = 0;
	SCM_ARRAY_DIMS (sra)->ubnd = len - 1;
	SCM_ARRAY_V (sra) = SCM_ARRAY_V (ra);
	SCM_ARRAY_BASE (sra) = SCM_ARRAY_BASE (ra);
	SCM_ARRAY_DIMS (sra)->inc = (ndim ? SCM_ARRAY_DIMS (ra)[ndim - 1].inc : 1);
	return sra;
      }
    }
}
#undef FUNC_NAME


SCM 
scm_ra2contig (SCM ra, int copy)
{
  SCM ret;
  long inc = 1;
  scm_sizet k, len = 1;
  for (k = SCM_ARRAY_NDIM (ra); k--;)
    len *= SCM_ARRAY_DIMS (ra)[k].ubnd - SCM_ARRAY_DIMS (ra)[k].lbnd + 1;
  k = SCM_ARRAY_NDIM (ra);
  if (SCM_ARRAY_CONTP (ra) && ((0 == k) || (1 == SCM_ARRAY_DIMS (ra)[k - 1].inc)))
    {
      if (scm_tc7_bvect != SCM_TYP7 (ra))
	return ra;
      if ((len == SCM_LENGTH (SCM_ARRAY_V (ra)) &&
	   0 == SCM_ARRAY_BASE (ra) % SCM_LONG_BIT &&
	   0 == len % SCM_LONG_BIT))
	return ra;
    }
  ret = scm_make_ra (k);
  SCM_ARRAY_BASE (ret) = 0;
  while (k--)
    {
      SCM_ARRAY_DIMS (ret)[k].lbnd = SCM_ARRAY_DIMS (ra)[k].lbnd;
      SCM_ARRAY_DIMS (ret)[k].ubnd = SCM_ARRAY_DIMS (ra)[k].ubnd;
      SCM_ARRAY_DIMS (ret)[k].inc = inc;
      inc *= SCM_ARRAY_DIMS (ra)[k].ubnd - SCM_ARRAY_DIMS (ra)[k].lbnd + 1;
    }
  SCM_ARRAY_V (ret) = scm_make_uve ((inc - 1), scm_array_prototype (ra));
  if (copy)
    scm_array_copy_x (ra, ret);
  return ret;
}


SCM_DEFINE (scm_uniform_array_read_x, "uniform-array-read!", 1, 3, 0,
           (SCM ra, SCM port_or_fd, SCM start, SCM end),
	    "@deffnx primitive uniform-vector-read! uve [port-or-fdes] [start] [end]\n"
	    "Attempts to read all elements of @var{ura}, in lexicographic order, as\n"
	    "binary objects from @var{port-or-fdes}.\n"
	    "If an end of file is encountered during\n"
	    "uniform-array-read! the objects up to that point only are put into @var{ura}\n"
	    "(starting at the beginning) and the remainder of the array is\n"
	    "unchanged.\n\n"
	    "The optional arguments @var{start} and @var{end} allow\n"
	    "a specified region of a vector (or linearized array) to be read,\n"
	    "leaving the remainder of the vector unchanged.\n\n"
	    "@code{uniform-array-read!} returns the number of objects read.\n"
	    "@var{port-or-fdes} may be omitted, in which case it defaults to the value\n"
	    "returned by @code{(current-input-port)}.")
#define FUNC_NAME s_scm_uniform_array_read_x
{
  SCM cra = SCM_UNDEFINED, v = ra;
  long sz, vlen, ans;
  long cstart = 0;
  long cend;
  long offset = 0;

  SCM_ASRTGO (SCM_NIMP (v), badarg1);
  if (SCM_UNBNDP (port_or_fd))
    port_or_fd = scm_cur_inp;
  else
    SCM_ASSERT (SCM_INUMP (port_or_fd)
		|| (SCM_OPINPORTP (port_or_fd)),
		port_or_fd, SCM_ARG2, FUNC_NAME);
  vlen = SCM_LENGTH (v);

loop:
  switch SCM_TYP7 (v)
    {
    default:
    badarg1:SCM_WTA (SCM_ARG1,v);
    case scm_tc7_smob:
      SCM_ASRTGO (SCM_ARRAYP (v), badarg1);
      cra = scm_ra2contig (ra, 0);
      cstart += SCM_ARRAY_BASE (cra);
      vlen = SCM_ARRAY_DIMS (cra)->inc *
	(SCM_ARRAY_DIMS (cra)->ubnd - SCM_ARRAY_DIMS (cra)->lbnd + 1);
      v = SCM_ARRAY_V (cra);
      goto loop;
    case scm_tc7_string:
    case scm_tc7_byvect:
      sz = sizeof (char);
      break;
    case scm_tc7_bvect:
      vlen = (vlen + SCM_LONG_BIT - 1) / SCM_LONG_BIT;
      cstart /= SCM_LONG_BIT;
    case scm_tc7_uvect:
    case scm_tc7_ivect:
      sz = sizeof (long);
      break;
    case scm_tc7_svect:
      sz = sizeof (short);
      break;
#ifdef HAVE_LONG_LONGS
    case scm_tc7_llvect:
      sz = sizeof (long_long);
      break;
#endif
    case scm_tc7_fvect:
      sz = sizeof (float);
      break;
    case scm_tc7_dvect:
      sz = sizeof (double);
      break;
    case scm_tc7_cvect:
      sz = 2 * sizeof (double);
      break;
    }
  
  cend = vlen;
  if (!SCM_UNBNDP (start))
    {
      offset = 
	SCM_NUM2LONG (3, start);

      if (offset < 0 || offset >= cend)
	scm_out_of_range (FUNC_NAME, start);

      if (!SCM_UNBNDP (end))
	{
	  long tend =
	    SCM_NUM2LONG (4, end);
      
	  if (tend <= offset || tend > cend)
	    scm_out_of_range (FUNC_NAME, end);
	  cend = tend;
	}
    }

  if (SCM_NIMP (port_or_fd))
    {
      scm_port *pt = SCM_PTAB_ENTRY (port_or_fd);
      int remaining = (cend - offset) * sz;
      char *dest = SCM_CHARS (v) + (cstart + offset) * sz;

      if (pt->rw_active == SCM_PORT_WRITE)
	scm_flush (port_or_fd);

      ans = cend - offset;
      while (remaining > 0)
	{
	  if (pt->read_pos < pt->read_end)
	    {
	      int to_copy = min (pt->read_end - pt->read_pos,
				 remaining);

	      memcpy (dest, pt->read_pos, to_copy);
	      pt->read_pos += to_copy;
	      remaining -= to_copy;
	      dest += to_copy;
	    }
	  else
	    {
	      if (scm_fill_input (port_or_fd) == EOF)
		{
		  if (remaining % sz != 0)
		    {
		      SCM_MISC_ERROR ("unexpected EOF", SCM_EOL);
		    }
		  ans -= remaining / sz;
		  break;
		}
	    }
	}
      
      if (pt->rw_random)
	pt->rw_active = SCM_PORT_READ;
    }
  else /* file descriptor.  */
    {
      SCM_SYSCALL (ans = read (SCM_INUM (port_or_fd),
			       SCM_CHARS (v) + (cstart + offset) * sz,
			       (scm_sizet) (sz * (cend - offset))));
      if (ans == -1)
	SCM_SYSERROR;
    }
  if (SCM_TYP7 (v) == scm_tc7_bvect)
    ans *= SCM_LONG_BIT;

  if (!SCM_EQ_P (v, ra) && !SCM_EQ_P (cra, ra))
    scm_array_copy_x (cra, ra);

  return SCM_MAKINUM (ans);
}
#undef FUNC_NAME

SCM_DEFINE (scm_uniform_array_write, "uniform-array-write", 1, 3, 0,
           (SCM v, SCM port_or_fd, SCM start, SCM end),
	    "@deffnx primitive uniform-vector-write uve [port-or-fdes] [start] [end]\n"
	    "Writes all elements of @var{ura} as binary objects to\n"
	    "@var{port-or-fdes}.\n\n"
	    "The optional arguments @var{start}\n"
	    "and @var{end} allow\n"
	    "a specified region of a vector (or linearized array) to be written.\n\n"
	    "The number of objects actually written is returned. \n"
	    "@var{port-or-fdes} may be\n"
	    "omitted, in which case it defaults to the value returned by\n"
	    "@code{(current-output-port)}.")
#define FUNC_NAME s_scm_uniform_array_write
{
  long sz, vlen, ans;
  long offset = 0;
  long cstart = 0;
  long cend;

  port_or_fd = SCM_COERCE_OUTPORT (port_or_fd);

  SCM_ASRTGO (SCM_NIMP (v), badarg1);
  if (SCM_UNBNDP (port_or_fd))
    port_or_fd = scm_cur_outp;
  else
    SCM_ASSERT (SCM_INUMP (port_or_fd)
		|| (SCM_OPOUTPORTP (port_or_fd)),
		port_or_fd, SCM_ARG2, FUNC_NAME);
  vlen = SCM_LENGTH (v);

loop:
  switch SCM_TYP7 (v)
    {
    default:
    badarg1:SCM_WTA (1, v);
    case scm_tc7_smob:
      SCM_ASRTGO (SCM_ARRAYP (v), badarg1);
      v = scm_ra2contig (v, 1);
      cstart = SCM_ARRAY_BASE (v);
      vlen = SCM_ARRAY_DIMS (v)->inc
	* (SCM_ARRAY_DIMS (v)->ubnd - SCM_ARRAY_DIMS (v)->lbnd + 1);
      v = SCM_ARRAY_V (v);
      goto loop;
    case scm_tc7_string:
    case scm_tc7_byvect:
      sz = sizeof (char);
      break;
    case scm_tc7_bvect:
      vlen = (vlen + SCM_LONG_BIT - 1) / SCM_LONG_BIT;
      cstart /= SCM_LONG_BIT;
    case scm_tc7_uvect:
    case scm_tc7_ivect:
      sz = sizeof (long);
      break;
    case scm_tc7_svect:
      sz = sizeof (short);
      break;
#ifdef HAVE_LONG_LONGS
    case scm_tc7_llvect:
      sz = sizeof (long_long);
      break;
#endif
    case scm_tc7_fvect:
      sz = sizeof (float);
      break;
    case scm_tc7_dvect:
      sz = sizeof (double);
      break;
    case scm_tc7_cvect:
      sz = 2 * sizeof (double);
      break;
    }

  cend = vlen;
  if (!SCM_UNBNDP (start))
    {
      offset = 
	SCM_NUM2LONG (3, start);

      if (offset < 0 || offset >= cend)
	scm_out_of_range (FUNC_NAME, start);

      if (!SCM_UNBNDP (end))
	{
	  long tend = 
	    SCM_NUM2LONG (4, end);
      
	  if (tend <= offset || tend > cend)
	    scm_out_of_range (FUNC_NAME, end);
	  cend = tend;
	}
    }

  if (SCM_NIMP (port_or_fd))
    {
      char *source = SCM_CHARS (v) + (cstart + offset) * sz;

      ans = cend - offset;
      scm_lfwrite (source, ans * sz, port_or_fd);
    }
  else /* file descriptor.  */
    {
      SCM_SYSCALL (ans = write (SCM_INUM (port_or_fd),
				SCM_CHARS (v) + (cstart + offset) * sz,
				(scm_sizet) (sz * (cend - offset))));
      if (ans == -1)
	SCM_SYSERROR;
    }
  if (SCM_TYP7 (v) == scm_tc7_bvect)
    ans *= SCM_LONG_BIT;

  return SCM_MAKINUM (ans);
}
#undef FUNC_NAME


static char cnt_tab[16] =
{0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4};

SCM_DEFINE (scm_bit_count, "bit-count", 2, 0, 0,
           (SCM b, SCM bitvector),
	    "Returns the number of occurrences of the boolean B in BITVECTOR.")
#define FUNC_NAME s_scm_bit_count
{
  SCM_VALIDATE_BOOL (1, b);
  SCM_ASSERT (!SCM_IMP (bitvector) && SCM_TYP7 (bitvector) == scm_tc7_bvect,
	      bitvector, 2, FUNC_NAME);
  if (SCM_LENGTH (bitvector) == 0) {
    return SCM_INUM0;
  } else {
    unsigned long int count = 0;
    unsigned long int i = (SCM_LENGTH (bitvector) - 1) / SCM_LONG_BIT;
    unsigned long int w = SCM_UNPACK (SCM_VELTS (bitvector)[i]);
    if (SCM_FALSEP (b)) {
      w = ~w;
    };
    w <<= SCM_LONG_BIT - 1 - ((SCM_LENGTH (bitvector) - 1) % SCM_LONG_BIT);
    while (1) {
      while (w) {
	count += cnt_tab[w & 0x0f];
	w >>= 4;
      }
      if (i == 0) {
	return SCM_MAKINUM (count);
      } else {
	--i;
	w = SCM_UNPACK (SCM_VELTS (bitvector)[i]);
	if (SCM_FALSEP (b)) {
	  w = ~w;
	}
      }
    }
  }
}
#undef FUNC_NAME


SCM_DEFINE (scm_bit_position, "bit-position", 3, 0, 0,
           (SCM item, SCM v, SCM k),
	    "Returns the minimum index of an occurrence of @var{bool} in @var{bv}\n"
	    "which is at least @var{k}.  If no @var{bool} occurs within the specified\n"
	    "range @code{#f} is returned.")
#define FUNC_NAME s_scm_bit_position
{
  long i, lenw, xbits, pos;
  register unsigned long w;
  SCM_VALIDATE_NIM (2,v);
  SCM_VALIDATE_INUM_COPY (3,k,pos);
  SCM_ASSERT_RANGE (3, k, (pos <= SCM_LENGTH (v)) && (pos >= 0));
  if (pos == SCM_LENGTH (v))
    return SCM_BOOL_F;
  switch SCM_TYP7 (v)
    {
    default:
      SCM_WTA (2,v);
    case scm_tc7_bvect:
      if (0 == SCM_LENGTH (v))
	return SCM_MAKINUM (-1L);
      lenw = (SCM_LENGTH (v) - 1) / SCM_LONG_BIT;	/* watch for part words */
      i = pos / SCM_LONG_BIT;
      w = SCM_UNPACK (SCM_VELTS (v)[i]);
      if (SCM_FALSEP (item))
	w = ~w;
      xbits = (pos % SCM_LONG_BIT);
      pos -= xbits;
      w = ((w >> xbits) << xbits);
      xbits = SCM_LONG_BIT - 1 - (SCM_LENGTH (v) - 1) % SCM_LONG_BIT;
      while (!0)
	{
	  if (w && (i == lenw))
	    w = ((w << xbits) >> xbits);
	  if (w)
	    while (w)
	      switch (w & 0x0f)
		{
		default:
		  return SCM_MAKINUM (pos);
		case 2:
		case 6:
		case 10:
		case 14:
		  return SCM_MAKINUM (pos + 1);
		case 4:
		case 12:
		  return SCM_MAKINUM (pos + 2);
		case 8:
		  return SCM_MAKINUM (pos + 3);
		case 0:
		  pos += 4;
		  w >>= 4;
		}
	  if (++i > lenw)
	    break;
	  pos += SCM_LONG_BIT;
	  w = SCM_UNPACK (SCM_VELTS (v)[i]);
	  if (SCM_FALSEP (item))
	    w = ~w;
	}
      return SCM_BOOL_F;
    }
}
#undef FUNC_NAME


SCM_DEFINE (scm_bit_set_star_x, "bit-set*!", 3, 0, 0,
           (SCM v, SCM kv, SCM obj),
	    "If uve is a bit-vector @var{bv} and uve must be of the same length.  If\n"
	    "@var{bool} is @code{#t}, uve is OR'ed into @var{bv}; If @var{bool} is @code{#f}, the\n"
	    "inversion of uve is AND'ed into @var{bv}.\n\n"
	    "If uve is a unsigned integer vector all the elements of uve must be\n"
	    "between 0 and the @code{LENGTH} of @var{bv}.  The bits of @var{bv}\n"
	    "corresponding to the indexes in uve are set to @var{bool}.\n\n"
	    "The return value is unspecified.")
#define FUNC_NAME s_scm_bit_set_star_x
{
  register long i, k, vlen;
  SCM_ASRTGO (SCM_NIMP (v), badarg1);
  SCM_ASRTGO (SCM_NIMP (kv), badarg2);
  switch SCM_TYP7 (kv)
    {
    default:
    badarg2:SCM_WTA (2,kv);
    case scm_tc7_uvect:
      switch SCM_TYP7 (v)
	{
	default:
	badarg1:  SCM_WTA (1,v);
	case scm_tc7_bvect:
	  vlen = SCM_LENGTH (v);
	  if (SCM_FALSEP (obj))
	    for (i = SCM_LENGTH (kv); i;)
	      {
		k = SCM_UNPACK (SCM_VELTS (kv)[--i]);
		if (k >= vlen)
		  scm_out_of_range (FUNC_NAME, SCM_MAKINUM (k));
		SCM_BITVEC_CLR(v,k);
	      }
	  else if (SCM_EQ_P (obj, SCM_BOOL_T))
	    for (i = SCM_LENGTH (kv); i;)
	      {
		k = SCM_UNPACK (SCM_VELTS (kv)[--i]);
		if (k >= vlen)
		  scm_out_of_range (FUNC_NAME, SCM_MAKINUM (k));
		SCM_BITVEC_SET(v,k);
	      }
	  else
	  badarg3:SCM_WTA (3,obj);
	}
      break;
    case scm_tc7_bvect:
      SCM_ASRTGO (SCM_TYP7 (v) == scm_tc7_bvect && SCM_LENGTH (v) == SCM_LENGTH (kv), badarg1);
      if (SCM_FALSEP (obj))
	for (k = (SCM_LENGTH (v) + SCM_LONG_BIT - 1) / SCM_LONG_BIT; k--;)
	  SCM_UNPACK (SCM_VELTS (v)[k]) &= ~ SCM_UNPACK(SCM_VELTS (kv)[k]);
      else if (SCM_EQ_P (obj, SCM_BOOL_T))
	for (k = (SCM_LENGTH (v) + SCM_LONG_BIT - 1) / SCM_LONG_BIT; k--;)
	  SCM_UNPACK (SCM_VELTS (v)[k]) |= SCM_UNPACK (SCM_VELTS (kv)[k]);
      else
	goto badarg3;
      break;
    }
  return SCM_UNSPECIFIED;
}
#undef FUNC_NAME


SCM_DEFINE (scm_bit_count_star, "bit-count*", 3, 0, 0,
           (SCM v, SCM kv, SCM obj),
	    "Returns\n"
	    "@example\n"
	    "(bit-count (bit-set*! (if bool bv (bit-invert! bv)) uve #t) #t).\n"
	    "@end example\n"
	    "@var{bv} is not modified.")
#define FUNC_NAME s_scm_bit_count_star
{
  register long i, vlen, count = 0;
  register unsigned long k;
  int fObj = 0;
  
  SCM_ASRTGO (SCM_NIMP (v), badarg1);
  SCM_ASRTGO (SCM_NIMP (kv), badarg2);
  switch SCM_TYP7 (kv)
    {
    default:
    badarg2:
        SCM_WTA (2,kv);
    case scm_tc7_uvect:
      switch SCM_TYP7
	(v)
	{
	default:
	badarg1:
	  SCM_WTA (1,v);
	case scm_tc7_bvect:
	  vlen = SCM_LENGTH (v);
	  if (SCM_FALSEP (obj))
	    for (i = SCM_LENGTH (kv); i;)
	      {
		k = SCM_UNPACK (SCM_VELTS (kv)[--i]);
		if (k >= vlen)
		  scm_out_of_range (FUNC_NAME, SCM_MAKINUM (k));
		if (!SCM_BITVEC_REF(v,k))
		  count++;
	      }
	  else if (SCM_EQ_P (obj, SCM_BOOL_T))
	    for (i = SCM_LENGTH (kv); i;)
	      {
		k = SCM_UNPACK (SCM_VELTS (kv)[--i]);
		if (k >= vlen)
		  scm_out_of_range (FUNC_NAME, SCM_MAKINUM (k));
		if (SCM_BITVEC_REF (v,k))
		  count++;
	      }
	  else
	  badarg3:SCM_WTA (3,obj);
	}
      break;
    case scm_tc7_bvect:
      SCM_ASRTGO (SCM_TYP7 (v) == scm_tc7_bvect && SCM_LENGTH (v) == SCM_LENGTH (kv), badarg1);
      if (0 == SCM_LENGTH (v))
	return SCM_INUM0;
      SCM_ASRTGO (SCM_BOOLP (obj), badarg3);
      fObj = SCM_EQ_P (obj, SCM_BOOL_T);
      i = (SCM_LENGTH (v) - 1) / SCM_LONG_BIT;
      k = SCM_UNPACK (SCM_VELTS (kv)[i]) & (fObj ? SCM_UNPACK (SCM_VELTS (v)[i]) : ~ SCM_UNPACK (SCM_VELTS (v)[i]));
      k <<= SCM_LONG_BIT - 1 - ((SCM_LENGTH (v) - 1) % SCM_LONG_BIT);
      while (1)
	{
	  for (; k; k >>= 4)
	    count += cnt_tab[k & 0x0f];
	  if (0 == i--)
	    return SCM_MAKINUM (count);

         /* urg. repetitive (see above.) */
	  k = SCM_UNPACK (SCM_VELTS (kv)[i]) & (fObj ? SCM_UNPACK(SCM_VELTS (v)[i]) : ~SCM_UNPACK (SCM_VELTS (v)[i]));
	}
    }
  return SCM_MAKINUM (count);
}
#undef FUNC_NAME


SCM_DEFINE (scm_bit_invert_x, "bit-invert!", 1, 0, 0, 
           (SCM v),
	    "Modifies @var{bv} by replacing each element with its negation.")
#define FUNC_NAME s_scm_bit_invert_x
{
  register long k;
  SCM_ASRTGO (SCM_NIMP (v), badarg1);
  k = SCM_LENGTH (v);
  switch SCM_TYP7
    (v)
    {
    case scm_tc7_bvect:
      for (k = (k + SCM_LONG_BIT - 1) / SCM_LONG_BIT; k--;)
	SCM_UNPACK (SCM_VELTS (v)[k]) = ~SCM_UNPACK(SCM_VELTS (v)[k]);
      break;
    default:
    badarg1:SCM_WTA (1,v);
    }
  return SCM_UNSPECIFIED;
}
#undef FUNC_NAME


SCM 
scm_istr2bve (char *str, long len)
{
  SCM v = scm_make_uve (len, SCM_BOOL_T);
  long *data = (long *) SCM_VELTS (v);
  register unsigned long mask;
  register long k;
  register long j;
  for (k = 0; k < (len + SCM_LONG_BIT - 1) / SCM_LONG_BIT; k++)
    {
      data[k] = 0L;
      j = len - k * SCM_LONG_BIT;
      if (j > SCM_LONG_BIT)
	j = SCM_LONG_BIT;
      for (mask = 1L; j--; mask <<= 1)
	switch (*str++)
	  {
	  case '0':
	    break;
	  case '1':
	    data[k] |= mask;
	    break;
	  default:
	    return SCM_BOOL_F;
	  }
    }
  return v;
}


static SCM 
ra2l (SCM ra,scm_sizet base,scm_sizet k)
{
  register SCM res = SCM_EOL;
  register long inc = SCM_ARRAY_DIMS (ra)[k].inc;
  register scm_sizet i;
  if (SCM_ARRAY_DIMS (ra)[k].ubnd < SCM_ARRAY_DIMS (ra)[k].lbnd)
    return SCM_EOL;
  i = base + (1 + SCM_ARRAY_DIMS (ra)[k].ubnd - SCM_ARRAY_DIMS (ra)[k].lbnd) * inc;
  if (k < SCM_ARRAY_NDIM (ra) - 1)
    {
      do
	{
	  i -= inc;
	  res = scm_cons (ra2l (ra, i, k + 1), res);
	}
      while (i != base);
    }
  else
    do
      {
	i -= inc;
	res = scm_cons (scm_uniform_vector_ref (SCM_ARRAY_V (ra), SCM_MAKINUM (i)), res);
      }
    while (i != base);
  return res;
}


SCM_DEFINE (scm_array_to_list, "array->list", 1, 0, 0, 
           (SCM v),
	    "Returns a list consisting of all the elements, in order, of @var{array}.")
#define FUNC_NAME s_scm_array_to_list
{
  SCM res = SCM_EOL;
  register long k;
  SCM_ASRTGO (SCM_NIMP (v), badarg1);
  switch SCM_TYP7
    (v)
    {
    default:
    badarg1:SCM_WTA (1,v);
    case scm_tc7_smob:
      SCM_ASRTGO (SCM_ARRAYP (v), badarg1);
      return ra2l (v, SCM_ARRAY_BASE (v), 0);
    case scm_tc7_vector:
    case scm_tc7_wvect:
      return scm_vector_to_list (v);
    case scm_tc7_string:
      return scm_string_to_list (v);
    case scm_tc7_bvect:
      {
	long *data = (long *) SCM_VELTS (v);
	register unsigned long mask;
	for (k = (SCM_LENGTH (v) - 1) / SCM_LONG_BIT; k > 0; k--)
	  for (mask = 1UL << (SCM_LONG_BIT - 1); mask; mask >>= 1)
	    res = scm_cons (SCM_BOOL(((long *) data)[k] & mask), res);
	for (mask = 1L << ((SCM_LENGTH (v) % SCM_LONG_BIT) - 1); mask; mask >>= 1)
	  res = scm_cons (SCM_BOOL(((long *) data)[k] & mask), res);
	return res;
      }
  case scm_tc7_uvect: {
    long *data = (long *)SCM_VELTS(v);
    for (k = SCM_LENGTH(v) - 1; k >= 0; k--)
      res = scm_cons(scm_ulong2num(data[k]), res);
    return res;
  }
  case scm_tc7_ivect: {
    long *data = (long *)SCM_VELTS(v);
    for (k = SCM_LENGTH(v) - 1; k >= 0; k--)
      res = scm_cons(scm_long2num(data[k]), res);
    return res;
  }
    case scm_tc7_svect: {
      short *data;
      data = (short *)SCM_VELTS(v);
      for (k = SCM_LENGTH(v) - 1; k >= 0; k--)
	res = scm_cons(SCM_MAKINUM (data[k]), res);
      return res;
    }
#ifdef HAVE_LONG_LONGS
    case scm_tc7_llvect: {
      long_long *data;
      data = (long_long *)SCM_VELTS(v);
      for (k = SCM_LENGTH(v) - 1; k >= 0; k--)
	res = scm_cons(scm_long_long2num(data[k]), res);
      return res;
    }
#endif


    case scm_tc7_fvect:
      {
	float *data = (float *) SCM_VELTS (v);
	for (k = SCM_LENGTH (v) - 1; k >= 0; k--)
	  res = scm_cons (scm_make_real (data[k]), res);
	return res;
      }
    case scm_tc7_dvect:
      {
	double *data = (double *) SCM_VELTS (v);
	for (k = SCM_LENGTH (v) - 1; k >= 0; k--)
	  res = scm_cons (scm_make_real (data[k]), res);
	return res;
      }
    case scm_tc7_cvect:
      {
	double (*data)[2] = (double (*)[2]) SCM_VELTS (v);
	for (k = SCM_LENGTH (v) - 1; k >= 0; k--)
	  res = scm_cons (scm_make_complex (data[k][0], data[k][1]), res);
	return res;
      }
    }
}
#undef FUNC_NAME


static char s_bad_ralst[] = "Bad scm_array contents list";

static int l2ra(SCM lst, SCM ra, scm_sizet base, scm_sizet k);

SCM_DEFINE (scm_list_to_uniform_array, "list->uniform-array", 3, 0, 0,
           (SCM ndim, SCM prot, SCM lst),
	    "@deffnx procedure list->uniform-vector prot lst\n"
	    "Returns a uniform array of the type indicated by prototype @var{prot}\n"
	    "with elements the same as those of @var{lst}.  Elements must be of the\n"
	    "appropriate type, no coercions are done.")
#define FUNC_NAME s_scm_list_to_uniform_array
{
  SCM shp = SCM_EOL;
  SCM row = lst;
  SCM ra;
  scm_sizet k;
  long n;
  SCM_VALIDATE_INUM_COPY (1,ndim,k);
  while (k--)
    {
      n = scm_ilength (row);
      SCM_ASSERT (n >= 0, lst, SCM_ARG3, FUNC_NAME);
      shp = scm_cons (SCM_MAKINUM (n), shp);
      if (SCM_NIMP (row))
	row = SCM_CAR (row);
    }
  ra = scm_dimensions_to_uniform_array (scm_reverse (shp), prot,
					SCM_UNDEFINED);
  if (SCM_NULLP (shp))

    {
      SCM_ASRTGO (1 == scm_ilength (lst), badlst);
      scm_array_set_x (ra, SCM_CAR (lst), SCM_EOL);
      return ra;
    }
  if (!SCM_ARRAYP (ra))
    {
      for (k = 0; k < SCM_LENGTH (ra); k++, lst = SCM_CDR (lst))
	scm_array_set_x (ra, SCM_CAR (lst), SCM_MAKINUM (k));
      return ra;
    }
  if (l2ra (lst, ra, SCM_ARRAY_BASE (ra), 0))
    return ra;
  else
    badlst:scm_wta (lst, s_bad_ralst, FUNC_NAME);
  return SCM_BOOL_F;
}
#undef FUNC_NAME

static int 
l2ra (SCM lst, SCM ra, scm_sizet base, scm_sizet k)
{
  register long inc = SCM_ARRAY_DIMS (ra)[k].inc;
  register long n = (1 + SCM_ARRAY_DIMS (ra)[k].ubnd - SCM_ARRAY_DIMS (ra)[k].lbnd);
  int ok = 1;
  if (n <= 0)
    return (SCM_NULLP (lst));
  if (k < SCM_ARRAY_NDIM (ra) - 1)
    {
      while (n--)
	{
	  if (SCM_IMP (lst) || SCM_NCONSP (lst))
	    return 0;
	  ok = ok && l2ra (SCM_CAR (lst), ra, base, k + 1);
	  base += inc;
	  lst = SCM_CDR (lst);
	}
      if (SCM_NNULLP (lst))
 return 0;
    }
  else
    {
      while (n--)
	{
	  if (SCM_IMP (lst) || SCM_NCONSP (lst))
	    return 0;
	  scm_array_set_x (SCM_ARRAY_V (ra), SCM_CAR (lst), SCM_MAKINUM (base));
	  base += inc;
	  lst = SCM_CDR (lst);
	}
      if (SCM_NNULLP (lst))
	return 0;
    }
  return ok;
}


static void 
rapr1 (SCM ra,scm_sizet j,scm_sizet k,SCM port,scm_print_state *pstate)
{
  long inc = 1;
  long n = SCM_LENGTH (ra);
  int enclosed = 0;
tail:
  switch SCM_TYP7 (ra)
    {
    case scm_tc7_smob:
      if (enclosed++)
	{
	  SCM_ARRAY_BASE (ra) = j;
	  if (n-- > 0)
	    scm_iprin1 (ra, port, pstate);
	  for (j += inc; n-- > 0; j += inc)
	    {
	      scm_putc (' ', port);
	      SCM_ARRAY_BASE (ra) = j;
	      scm_iprin1 (ra, port, pstate);
	    }
	  break;
	}
      if (k + 1 < SCM_ARRAY_NDIM (ra))
	{
	  long i;
	  inc = SCM_ARRAY_DIMS (ra)[k].inc;
	  for (i = SCM_ARRAY_DIMS (ra)[k].lbnd; i < SCM_ARRAY_DIMS (ra)[k].ubnd; i++)
	    {
	      scm_putc ('(', port);
	      rapr1 (ra, j, k + 1, port, pstate);
	      scm_puts (") ", port);
	      j += inc;
	    }
	  if (i == SCM_ARRAY_DIMS (ra)[k].ubnd)
	    {			/* could be zero size. */
	      scm_putc ('(', port);
	      rapr1 (ra, j, k + 1, port, pstate);
	      scm_putc (')', port);
	    }
	  break;
	}
      if SCM_ARRAY_NDIM
	(ra)
	{			/* Could be zero-dimensional */
	  inc = SCM_ARRAY_DIMS (ra)[k].inc;
	  n = (SCM_ARRAY_DIMS (ra)[k].ubnd - SCM_ARRAY_DIMS (ra)[k].lbnd + 1);
	}
      else
	n = 1;
      ra = SCM_ARRAY_V (ra);
      goto tail;
    default:
      /* scm_tc7_bvect and scm_tc7_llvect only?  */
      if (n-- > 0)
	scm_iprin1 (scm_uniform_vector_ref (ra, SCM_MAKINUM (j)), port, pstate);
      for (j += inc; n-- > 0; j += inc)
	{
	  scm_putc (' ', port);
	  scm_iprin1 (scm_cvref (ra, j, SCM_UNDEFINED), port, pstate);
	}
      break;
    case scm_tc7_string:
      if (n-- > 0)
	scm_iprin1 (SCM_MAKE_CHAR (SCM_UCHARS (ra)[j]), port, pstate);
      if (SCM_WRITINGP (pstate))
	for (j += inc; n-- > 0; j += inc)
	  {
	    scm_putc (' ', port);
	    scm_iprin1 (SCM_MAKE_CHAR (SCM_UCHARS (ra)[j]), port, pstate);
	  }
      else
	for (j += inc; n-- > 0; j += inc)
	  scm_putc (SCM_CHARS (ra)[j], port);
      break;
    case scm_tc7_byvect:
      if (n-- > 0)
	scm_intprint (((char *) SCM_CELL_WORD_1 (ra))[j], 10, port);
      for (j += inc; n-- > 0; j += inc)
	{
	  scm_putc (' ', port);
	  scm_intprint (((char *)SCM_CELL_WORD_1 (ra))[j], 10, port);
	}
      break;

    case scm_tc7_uvect:
      {
	char str[11];

	if (n-- > 0)
	  {
	    /* intprint can't handle >= 2^31.  */
	    sprintf (str, "%lu", ((unsigned long *) SCM_VELTS (ra))[j]);
	    scm_puts (str, port);
	  }
	for (j += inc; n-- > 0; j += inc)
	  {
	    scm_putc (' ', port);
	    sprintf (str, "%lu", ((unsigned long *) SCM_VELTS (ra))[j]);
	    scm_puts (str, port);
	  }
      }
    case scm_tc7_ivect:
      if (n-- > 0)
	scm_intprint (((signed long *) SCM_VELTS (ra))[j], 10, port);
      for (j += inc; n-- > 0; j += inc)
	{
	  scm_putc (' ', port);
	  scm_intprint (((signed long *) SCM_VELTS (ra))[j], 10, port);
	}
      break;

    case scm_tc7_svect:
      if (n-- > 0)
	scm_intprint (((short *) SCM_CELL_WORD_1 (ra))[j], 10, port);
      for (j += inc; n-- > 0; j += inc)
	{
	  scm_putc (' ', port);
	  scm_intprint (((short *) SCM_CELL_WORD_1 (ra))[j], 10, port);
	}
      break;

    case scm_tc7_fvect:
      if (n-- > 0)
	{
	  SCM z = scm_make_real (1.0);
	  SCM_REAL_VALUE (z) = ((float *) SCM_VELTS (ra))[j];
	  scm_print_real (z, port, pstate);
	  for (j += inc; n-- > 0; j += inc)
	    {
	      scm_putc (' ', port);
	      SCM_REAL_VALUE (z) = ((float *) SCM_VELTS (ra))[j];
	      scm_print_real (z, port, pstate);
	    }
	}
      break;
    case scm_tc7_dvect:
      if (n-- > 0)
	{
	  SCM z = scm_make_real (1.0 / 3.0);
	  SCM_REAL_VALUE (z) = ((double *) SCM_VELTS (ra))[j];
	  scm_print_real (z, port, pstate);
	  for (j += inc; n-- > 0; j += inc)
	    {
	      scm_putc (' ', port);
	      SCM_REAL_VALUE (z) = ((double *) SCM_VELTS (ra))[j];
	      scm_print_real (z, port, pstate);
	    }
	}
      break;
    case scm_tc7_cvect:
      if (n-- > 0)
	{
	  SCM cz = scm_make_complex (0.0, 1.0), z = scm_make_real (1.0 / 3.0);
	  SCM_REAL_VALUE (z) =
	    SCM_COMPLEX_REAL (cz) = ((double *) SCM_VELTS (ra))[2 * j];
	  SCM_COMPLEX_IMAG (cz) = ((double *) SCM_VELTS (ra))[2 * j + 1];
	  scm_print_complex ((0.0 == SCM_COMPLEX_IMAG (cz) ? z : cz),
			     port, pstate);
	  for (j += inc; n-- > 0; j += inc)
	    {
	      scm_putc (' ', port);
	      SCM_REAL_VALUE (z)
		= SCM_COMPLEX_REAL (cz) = ((double *) SCM_VELTS (ra))[2 * j];
	      SCM_COMPLEX_IMAG (cz) = ((double *) SCM_VELTS (ra))[2 * j + 1];
	      scm_print_complex ((0.0 == SCM_COMPLEX_IMAG (cz) ? z : cz),
				 port, pstate);
	    }
	}
      break;
    }
}


int 
scm_raprin1 (SCM exp, SCM port, scm_print_state *pstate)
{
  SCM v = exp;
  scm_sizet base = 0;
  scm_putc ('#', port);
tail:
  switch SCM_TYP7 (v)
    {
    case scm_tc7_smob:
      {
	long ndim = SCM_ARRAY_NDIM (v);
	base = SCM_ARRAY_BASE (v);
	v = SCM_ARRAY_V (v);
	if (SCM_ARRAYP (v))

	  {
	    scm_puts ("<enclosed-array ", port);
	    rapr1 (exp, base, 0, port, pstate);
	    scm_putc ('>', port);
	    return 1;
	  }
	else
	  {
	    scm_intprint (ndim, 10, port);
	    goto tail;
	  }
      }
    case scm_tc7_bvect:
      if (SCM_EQ_P (exp, v))
	{			/* a uve, not an scm_array */
	  register long i, j, w;
	  scm_putc ('*', port);
	  for (i = 0; i < (SCM_LENGTH (exp)) / SCM_LONG_BIT; i++)
	    {
	      scm_bits_t w = SCM_UNPACK (SCM_VELTS (exp)[i]);
	      for (j = SCM_LONG_BIT; j; j--)
		{
		  scm_putc (w & 1 ? '1' : '0', port);
		  w >>= 1;
		}
	    }
	  j = SCM_LENGTH (exp) % SCM_LONG_BIT;
	  if (j)
	    {
	      w = SCM_UNPACK (SCM_VELTS (exp)[SCM_LENGTH (exp) / SCM_LONG_BIT]);
	      for (; j; j--)
		{
		  scm_putc (w & 1 ? '1' : '0', port);
		  w >>= 1;
		}
	    }
	  return 1;
	}
      else
	scm_putc ('b', port);
      break;
    case scm_tc7_string:
      scm_putc ('a', port);
      break;
    case scm_tc7_byvect:
      scm_putc ('y', port);
      break;
    case scm_tc7_uvect:
      scm_putc ('u', port);
      break;
    case scm_tc7_ivect:
      scm_putc ('e', port);
      break;
    case scm_tc7_svect:
      scm_putc ('h', port);
      break;
#ifdef HAVE_LONG_LONGS
    case scm_tc7_llvect:
      scm_putc ('l', port);
      break;
#endif
    case scm_tc7_fvect:
      scm_putc ('s', port);
      break;
    case scm_tc7_dvect:
      scm_putc ('i', port);
      break;
    case scm_tc7_cvect:
      scm_putc ('c', port);
      break;
    }
  scm_putc ('(', port);
  rapr1 (exp, base, 0, port, pstate);
  scm_putc (')', port);
  return 1;
}

SCM_DEFINE (scm_array_prototype, "array-prototype", 1, 0, 0, 
           (SCM ra),
	    "Returns an object that would produce an array of the same type as\n"
	    "@var{array}, if used as the @var{prototype} for\n"
	    "@code{make-uniform-array}.")
#define FUNC_NAME s_scm_array_prototype
{
  int enclosed = 0;
  SCM_ASRTGO (SCM_NIMP (ra), badarg);
loop:
  switch SCM_TYP7
    (ra)
    {
    default:
    badarg:SCM_WTA (1,ra);
    case scm_tc7_smob:
      SCM_ASRTGO (SCM_ARRAYP (ra), badarg);
      if (enclosed++)
	return SCM_UNSPECIFIED;
      ra = SCM_ARRAY_V (ra);
      goto loop;
    case scm_tc7_vector:
    case scm_tc7_wvect:
      return SCM_EOL;
    case scm_tc7_bvect:
      return SCM_BOOL_T;
    case scm_tc7_string:
      return SCM_MAKE_CHAR ('a');
    case scm_tc7_byvect:
      return SCM_MAKE_CHAR ('\0');
    case scm_tc7_uvect:
      return SCM_MAKINUM (1L);
    case scm_tc7_ivect:
      return SCM_MAKINUM (-1L);
    case scm_tc7_svect:
      return SCM_CDR (scm_intern ("s", 1));
#ifdef HAVE_LONG_LONGS
    case scm_tc7_llvect:
      return SCM_CDR (scm_intern ("l", 1));
#endif
    case scm_tc7_fvect:
      return scm_make_real (1.0);
    case scm_tc7_dvect:
      return scm_make_real (1.0 / 3.0);
    case scm_tc7_cvect:
      return scm_make_complex (0.0, 1.0);
    }
}
#undef FUNC_NAME


static SCM
markra (SCM ptr)
{
  return SCM_ARRAY_V (ptr);
}


static scm_sizet
freera (SCM ptr)
{
  scm_must_free (SCM_CHARS (ptr));
  return sizeof (scm_array) + SCM_ARRAY_NDIM (ptr) * sizeof (scm_array_dim);
}

void
scm_init_unif ()
{
  scm_tc16_array = scm_make_smob_type_mfpe ("array", 0,
					    markra,
					    freera,
					    scm_raprin1,
					    scm_array_equal_p);
  scm_add_feature ("array");
#include "libguile/unif.x"
}

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