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 /* PHP Change: add length check */
53 if ((size_t)length+(size_t)scale > INT_MAX) {
54 zend_error(E_ERROR, "Result too long, max is %d", INT_MAX);
55 }
56 /* PHP Change: malloc() -> pemalloc(), removed free_list code */
57 temp = (bc_num) safe_pemalloc (1, sizeof(bc_struct)+length, scale, persistent);
58 #if 0
59 if (_bc_Free_list != NULL) {
60 temp = _bc_Free_list;
61 _bc_Free_list = temp->n_next;
62 } else {
63 temp = (bc_num) pemalloc (sizeof(bc_struct), persistent);
64 if (temp == NULL) bc_out_of_memory ();
65 }
66 #endif
67 temp->n_sign = PLUS;
68 temp->n_len = length;
69 temp->n_scale = scale;
70 temp->n_refs = 1;
71 /* PHP Change: malloc() -> pemalloc() */
72 temp->n_ptr = (char *) safe_pemalloc (1, length, scale, persistent);
73 if (temp->n_ptr == NULL) bc_out_of_memory();
74 temp->n_value = temp->n_ptr;
75 memset (temp->n_ptr, 0, length+scale);
76 return temp;
77 }
78
79
80 /* "Frees" a bc_num NUM. Actually decreases reference count and only
81 frees the storage if reference count is zero. */
82
83 void
_bc_free_num_ex(num,persistent)84 _bc_free_num_ex (num, persistent)
85 bc_num *num;
86 int persistent;
87 {
88 if (*num == NULL) return;
89 (*num)->n_refs--;
90 if ((*num)->n_refs == 0) {
91 if ((*num)->n_ptr)
92 /* PHP Change: free() -> pefree(), removed free_list code */
93 pefree ((*num)->n_ptr, persistent);
94 pefree(*num, persistent);
95 #if 0
96 (*num)->n_next = _bc_Free_list;
97 _bc_Free_list = *num;
98 #endif
99 }
100 *num = NULL;
101 }
102
103
104 /* Intitialize the number package! */
105
106 void
bc_init_numbers(void)107 bc_init_numbers (void)
108 {
109 BCG(_zero_) = _bc_new_num_ex (1,0,1);
110 BCG(_one_) = _bc_new_num_ex (1,0,1);
111 BCG(_one_)->n_value[0] = 1;
112 BCG(_two_) = _bc_new_num_ex (1,0,1);
113 BCG(_two_)->n_value[0] = 2;
114 }
115
116
117 /* Make a copy of a number! Just increments the reference count! */
118
119 bc_num
bc_copy_num(bc_num num)120 bc_copy_num (bc_num num)
121 {
122 num->n_refs++;
123 return num;
124 }
125
126
127 /* Initialize a number NUM by making it a copy of zero. */
128
129 void
bc_init_num(bc_num * num)130 bc_init_num (bc_num *num)
131 {
132 *num = bc_copy_num (BCG(_zero_));
133 }
134
135
