xref: /PHP-5.3/ext/bcmath/libbcmath/src/init.c (revision d0ee4977)
1 /* init.c: bcmath library file. */
2 /*
3     Copyright (C) 1991, 1992, 1993, 1994, 1997 Free Software Foundation, Inc.
4     Copyright (C) 2000 Philip A. Nelson
5 
6     This library is free software; you can redistribute it and/or
7     modify it under the terms of the GNU Lesser General Public
8     License as published by the Free Software Foundation; either
9     version 2 of the License, or (at your option) any later version.
10 
11     This library is distributed in the hope that it will be useful,
12     but WITHOUT ANY WARRANTY; without even the implied warranty of
13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14     Lesser General Public License for more details.  (COPYING.LIB)
15 
16     You should have received a copy of the GNU Lesser General Public
17     License along with this library; if not, write to:
18 
19       The Free Software Foundation, Inc.
20       59 Temple Place, Suite 330
21       Boston, MA 02111-1307 USA.
22 
23     You may contact the author by:
24        e-mail:  philnelson@acm.org
25       us-mail:  Philip A. Nelson
26                 Computer Science Department, 9062
27                 Western Washington University
28                 Bellingham, WA 98226-9062
29 
30 *************************************************************************/
31 
32 #include <config.h>
33 #include <stdio.h>
34 #include <assert.h>
35 #include <stdlib.h>
36 #include <ctype.h>
37 #include <stdarg.h>
38 #include "bcmath.h"
39 #include "private.h"
40 
41 #if SANDER_0
42  bc_num _bc_Free_list = NULL;
43 #endif
44 
45 /* new_num allocates a number and sets fields to known values. */
46 
47 bc_num
_bc_new_num_ex(length,scale,persistent)48 _bc_new_num_ex (length, scale, persistent)
49      int length, scale, persistent;
50 {
51   bc_num temp;
52 
53   /* PHP Change:  malloc() -> pemalloc(), removed free_list code */
54   temp = (bc_num) safe_pemalloc (1, sizeof(bc_struct)+length, scale, persistent);
55 #if 0
56   if (_bc_Free_list != NULL) {
57     temp = _bc_Free_list;
58     _bc_Free_list = temp->n_next;
59   } else {
60     temp = (bc_num) pemalloc (sizeof(bc_struct), persistent);
61     if (temp == NULL) bc_out_of_memory ();
62   }
63 #endif
64   temp->n_sign = PLUS;
65   temp->n_len = length;
66   temp->n_scale = scale;
67   temp->n_refs = 1;
68   /* PHP Change:  malloc() -> pemalloc() */
69   temp->n_ptr = (char *) safe_pemalloc (1, length, scale, persistent);
70   if (temp->n_ptr == NULL) bc_out_of_memory();
71   temp->n_value = temp->n_ptr;
72   memset (temp->n_ptr, 0, length+scale);
73   return temp;
74 }
75 
76 
77 /* "Frees" a bc_num NUM.  Actually decreases reference count and only
78    frees the storage if reference count is zero. */
79 
80 void
_bc_free_num_ex(num,persistent)81 _bc_free_num_ex (num, persistent)
82     bc_num *num;
83     int persistent;
84 {
85   if (*num == NULL) return;
86   (*num)->n_refs--;
87   if ((*num)->n_refs == 0) {
88     if ((*num)->n_ptr)
89 		/* PHP Change:  free() -> pefree(), removed free_list code */
90       pefree ((*num)->n_ptr, persistent);
91 	pefree(*num, persistent);
92 #if 0
93     (*num)->n_next = _bc_Free_list;
94     _bc_Free_list = *num;
95 #endif
96   }
97   *num = NULL;
98 }
99 
100 
101 /* Intitialize the number package! */
102 
103 void
bc_init_numbers(TSRMLS_D)104 bc_init_numbers (TSRMLS_D)
105 {
106   BCG(_zero_) = _bc_new_num_ex (1,0,1);
107   BCG(_one_)  = _bc_new_num_ex (1,0,1);
108   BCG(_one_)->n_value[0] = 1;
109   BCG(_two_)  = _bc_new_num_ex (1,0,1);
110   BCG(_two_)->n_value[0] = 2;
111 }
112 
113 
114 /* Make a copy of a number!  Just increments the reference count! */
115 
116 bc_num
bc_copy_num(bc_num num)117 bc_copy_num (bc_num num)
118 {
119   num->n_refs++;
120   return num;
121 }
122 
123 
124 /* Initialize a number NUM by making it a copy of zero. */
125 
126 void
bc_init_num(bc_num * num TSRMLS_DC)127 bc_init_num (bc_num *num TSRMLS_DC)
128 {
129   *num = bc_copy_num (BCG(_zero_));
130 }
131 
132