text: /* init.c: bcmath library file. */
  /*
      Copyright (C) 1991, 1992, 1993, 1994, 1997 Free Software Foundation, Inc.
      Copyright (C) 2000 Philip A. Nelson
  
      This library 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 2 of the License, or (at your option) any later version.
  
      This library 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.  (COPYING.LIB)
  
      You should have received a copy of the GNU Lesser General Public
      License along with this library; if not, write to:
  
        The Free Software Foundation, Inc.
        59 Temple Place, Suite 330
        Boston, MA 02111-1307 USA.
  
      You may contact the author by:
         e-mail:  philnelson@acm.org
        us-mail:  Philip A. Nelson
                  Computer Science Department, 9062
                  Western Washington University
                  Bellingham, WA 98226-9062
  
  *************************************************************************/
  
  #include "config.h"
  #include <stdio.h>
  #include <assert.h>
  #include <stdlib.h>
  #include <ctype.h>
  #include <stdarg.h>
  #include "bcmath.h"
  #include "private.h"
  
  #if SANDER_0
   bc_num _bc_Free_list = NULL;
  #endif
  
  /* new_num allocates a number and sets fields to known values. */
  
  bc_num
  _bc_new_num_ex (length, scale, persistent)
       int length, scale, persistent;
  {
    bc_num temp;
  
    temp = (bc_num)malloc(sizeof(bc_struct)+length + scale);
  #if 0
    if (_bc_Free_list != NULL) {
      temp = _bc_Free_list;
      _bc_Free_list = temp->n_next;
    } else {
      temp = (bc_num)malloc (sizeof(bc_struct));
      if (temp == NULL) bc_out_of_memory ();
    }
  #endif
    temp->n_sign = PLUS;
    temp->n_len = length;
    temp->n_scale = scale;
    temp->n_refs = 1;
    temp->n_ptr = (char *)malloc(length + scale);
    if (temp->n_ptr == NULL) bc_out_of_memory();
    temp->n_value = temp->n_ptr;
    memset(temp->n_ptr, 0, length+scale);
    return temp;
  }
  
  
  /* "Frees" a bc_num NUM.  Actually decreases reference count and only
     frees the storage if reference count is zero. */
  
  void
  _bc_free_num_ex (num, persistent)
      bc_num *num;
      int persistent;
  {
    if (*num == NULL) return;
    (*num)->n_refs--;
    if ((*num)->n_refs == 0) {
      if ((*num)->n_ptr) {
        free((*num)->n_ptr);
      }
      free(*num);
  #if 0
      (*num)->n_next = _bc_Free_list;
      _bc_Free_list = *num;
  #endif
    }
    *num = NULL;
  }
  
  
  /* Intitialize the number package! */
  
  void
  bc_init_numbers (TSRMLS_D)
  {
    BCG(_zero_) = _bc_new_num_ex (1,0,1);
    BCG(_one_)  = _bc_new_num_ex (1,0,1);
    BCG(_one_)->n_value[0] = 1;
    BCG(_two_)  = _bc_new_num_ex (1,0,1);
    BCG(_two_)->n_value[0] = 2;
  }
  
  
  /* Make a copy of a number!  Just increments the reference count! */
  
  bc_num
  bc_copy_num (bc_num num)
  {
    num->n_refs++;
    return num;
  }
  
  
  /* Initialize a number NUM by making it a copy of zero. */
  
  void
  bc_init_num (bc_num *num TSRMLS_DC)
  {
    *num = bc_copy_num (BCG(_zero_));
  }
  
  