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. (LICENSE)
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 <stdlib.h>
35 #include <ctype.h>
36 #include <stdarg.h>
37 #include "bcmath.h"
38 #include "private.h"
39
40 /* new_num allocates a number and sets fields to known values. */
41
42 bc_num
_bc_new_num_ex(length,scale,persistent)43 _bc_new_num_ex (length, scale, persistent)
44 int length, scale, persistent;
45 {
46 bc_num temp;
47 /* PHP Change: add length check */
48 if ((size_t)length+(size_t)scale > INT_MAX) {
49 zend_error(E_ERROR, "Result too long, max is %d", INT_MAX);
50 }
51 /* PHP Change: malloc() -> pemalloc(), removed free_list code */
52 temp = (bc_num) safe_pemalloc (1, sizeof(bc_struct)+length, scale, persistent);
53 temp->n_sign = PLUS;
54 temp->n_len = length;
55 temp->n_scale = scale;
56 temp->n_refs = 1;
57 /* PHP Change: malloc() -> pemalloc() */
58 temp->n_ptr = (char *) safe_pemalloc (1, length, scale, persistent);
59 temp->n_value = temp->n_ptr;
60 memset (temp->n_ptr, 0, length+scale);
61 return temp;
62 }
63
64
65 /* "Frees" a bc_num NUM. Actually decreases reference count and only
66 frees the storage if reference count is zero. */
67
68 void
_bc_free_num_ex(num,persistent)69 _bc_free_num_ex (num, persistent)
70 bc_num *num;
71 int persistent;
72 {
73 if (*num == NULL) return;
74 (*num)->n_refs--;
75 if ((*num)->n_refs == 0) {
76 if ((*num)->n_ptr)
77 /* PHP Change: free() -> pefree(), removed free_list code */
78 pefree ((*num)->n_ptr, persistent);
79 pefree(*num, persistent);
80 }
81 *num = NULL;
82 }
83
84
85 /* Intitialize the number package! */
86
87 void
bc_init_numbers(void)88 bc_init_numbers (void)
89 {
90 BCG(_zero_) = _bc_new_num_ex (1,0,1);
91 BCG(_one_) = _bc_new_num_ex (1,0,1);
92 BCG(_one_)->n_value[0] = 1;
93 BCG(_two_) = _bc_new_num_ex (1,0,1);
94 BCG(_two_)->n_value[0] = 2;
95 }
96
97
98 /* Make a copy of a number! Just increments the reference count! */
99
100 bc_num
bc_copy_num(bc_num num)101 bc_copy_num (bc_num num)
102 {
103 num->n_refs++;
104 return num;
105 }
106
107
108 /* Initialize a number NUM by making it a copy of zero. */
109
110 void
bc_init_num(bc_num * num)111 bc_init_num (bc_num *num)
112 {
113 *num = bc_copy_num (BCG(_zero_));
114 }
115
