/* Copyright 2003-2004,2006,2008-2018,2020
     Free Software Foundation, Inc.

   This file is part of Guile.

   Guile is free software: you can redistribute it and/or modify it
   under the terms of the GNU Lesser General Public License as published
   by the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.

   Guile 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 Lesser General Public
   License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with Guile.  If not, see
   <https://www.gnu.org/licenses/>.  */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

#include <stdio.h>
#include <string.h>
#include <unistd.h>

#define SCM_BUILDING_DEPRECATED_CODE

#include "boolean.h"
#include "bitvectors.h"
#include "deprecation.h"
#include "gc.h"
#include "gsubr.h"
#include "strings.h"

#include "deprecated.h"

#if (SCM_ENABLE_DEPRECATED == 1)



#ifndef MAXPATHLEN
#define MAXPATHLEN 80
#endif /* ndef MAXPATHLEN */
#ifndef X_OK
#define X_OK 1
#endif /* ndef X_OK */

char *
scm_find_executable (const char *name)
{
  char tbuf[MAXPATHLEN];
  int i = 0, c;
  FILE *f;

  scm_c_issue_deprecation_warning ("scm_find_executable is deprecated.");

  /* fprintf(stderr, "s_f_e checking access %s ->%d\n", name, access(name, X_OK)); fflush(stderr); */
  if (access (name, X_OK))
    return 0L;
  f = fopen (name, "r");
  if (!f)
    return 0L;
  if ((fgetc (f) == '#') && (fgetc (f) == '!'))
    {
      while (1)
	switch (c = fgetc (f))
	  {
	  case /*WHITE_SPACES */ ' ':
	  case '\t':
	  case '\r':
	  case '\f':
	  case EOF:
	    tbuf[i] = 0;
	    fclose (f);
	    return strdup (tbuf);
	  default:
	    tbuf[i++] = c;
	    break;
	  }
    }
  fclose (f);
  return strdup (name);
}




SCM_DEFINE (scm_bit_count, "bit-count", 2, 0, 0,
	    (SCM b, SCM bitvector),
	    "Return the number of occurrences of the boolean @var{b} in\n"
	    "@var{bitvector}.")
#define FUNC_NAME s_scm_bit_count
{
  int bit = scm_to_bool (b);
  size_t count = 0, len;

  scm_c_issue_deprecation_warning
    ("bit-count is deprecated.  Use bitvector-count, or a loop over array-ref "
     "if array support is needed.");

  if (scm_is_true (scm_bitvector_p (bitvector)))
    {
      len = scm_to_size_t (scm_bitvector_length (bitvector));
      count = scm_to_size_t (scm_bitvector_count (bitvector));
    }
  else
    {
      scm_t_array_handle handle;
      size_t off;
      ssize_t inc;

      scm_bitvector_elements (bitvector, &handle, &off, &len, &inc);

      for (size_t i = 0; i < len; i++)
	if (scm_is_true (scm_array_handle_ref (&handle, i*inc)))
	  count++;

      scm_array_handle_release (&handle);
    }
  
  return scm_from_size_t (bit ? count : len-count);
}
#undef FUNC_NAME

SCM_DEFINE (scm_bit_position, "bit-position", 3, 0, 0,
           (SCM item, SCM v, SCM k),
	    "Return the index of the first occurrence of @var{item} in bit\n"
	    "vector @var{v}, starting from @var{k}.  If there is no\n"
	    "@var{item} entry between @var{k} and the end of\n"
	    "@var{v}, then return @code{#f}.  For example,\n"
	    "\n"
	    "@example\n"
	    "(bit-position #t #*000101 0)  @result{} 3\n"
	    "(bit-position #f #*0001111 3) @result{} #f\n"
	    "@end example")
#define FUNC_NAME s_scm_bit_position
{
  scm_c_issue_deprecation_warning
    ("bit-position is deprecated.  Use bitvector-position, or "
     "array-ref in a loop if you need generic arrays instead.");

  if (scm_is_true (scm_bitvector_p (v)))
    return scm_bitvector_position (v, item, k);

  scm_t_array_handle handle;
  size_t off, len;
  ssize_t inc;
  scm_bitvector_elements (v, &handle, &off, &len, &inc);
  int bit = scm_to_bool (item);
  size_t first_bit = scm_to_unsigned_integer (k, 0, len);
  SCM res = SCM_BOOL_F;
  for (size_t i = first_bit; i < len; i++)
    {
      SCM elt = scm_array_handle_ref (&handle, i*inc);
      if ((bit && scm_is_true (elt)) || (!bit && scm_is_false (elt)))
        {
          res = scm_from_size_t (i);
          break;
        }
    }
  scm_array_handle_release (&handle);

  return res;
}
#undef FUNC_NAME

SCM
scm_istr2bve (SCM str)
{
  scm_t_array_handle handle;
  size_t len = scm_i_string_length (str);
  SCM vec = scm_c_make_bitvector (len, SCM_UNDEFINED);
  SCM res = vec;

  uint32_t mask;
  size_t k, j;
  const char *c_str;
  uint32_t *data;

  scm_c_issue_deprecation_warning
    ("scm_istr2bve is deprecated.  "
     "Read from a string instead, prefixed with `#*'.");

  data = scm_bitvector_writable_elements (vec, &handle, NULL, NULL, NULL);
  c_str = scm_i_string_chars (str);

  for (k = 0; k < (len + 31) / 32; k++)
    {
      data[k] = 0L;
      j = len - k * 32;
      if (j > 32)
	j = 32;
      for (mask = 1L; j--; mask <<= 1)
	switch (*c_str++)
	  {
	  case '0':
	    break;
	  case '1':
	    data[k] |= mask;
	    break;
	  default:
	    res = SCM_BOOL_F;
	    goto exit;
	  }
    }
  
 exit:
  scm_array_handle_release (&handle);
  scm_remember_upto_here_1 (str);
  return res;
}




void
scm_i_init_deprecated ()
{
#include "deprecated.x"
}

#endif /* SCM_ENABLE_DEPRECATD == 1 */