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 /* new_num allocates a number and sets fields to known values. */
42
43 bc_num
_bc_new_num_ex(length,scale,persistent)44 _bc_new_num_ex (length, scale, persistent)
45 int length, scale, persistent;
46 {
47 bc_num temp;
48 /* PHP Change: add length check */
49 if ((size_t)length+(size_t)scale > INT_MAX) {
50 zend_error(E_ERROR, "Result too long, max is %d", INT_MAX);
51 }
52 /* PHP Change: malloc() -> pemalloc(), removed free_list code */
53 temp = (bc_num) safe_pemalloc (1, sizeof(bc_struct)+length, scale, persistent);
54 temp->n_sign = PLUS;
55 temp->n_len = length;
56 temp->n_scale = scale;
57 temp->n_refs = 1;
58 /* PHP Change: malloc() -> pemalloc() */
59 temp->n_ptr = (char *) safe_pemalloc (1, length, scale, persistent);
60 temp->n_value = temp->n_ptr;
61 memset (temp->n_ptr, 0, length+scale);
62 return temp;
63 }
64
65
66 /* "Frees" a bc_num NUM. Actually decreases reference count and only
67 frees the storage if reference count is zero. */
68
69 void
_bc_free_num_ex(num,persistent)70 _bc_free_num_ex (num, persistent)
71 bc_num *num;
72 int persistent;
73 {
74 if (*num == NULL) return;
75 (*num)->n_refs--;
76 if ((*num)->n_refs == 0) {
77 if ((*num)->n_ptr)
78 /* PHP Change: free() -> pefree(), removed free_list code */
79 pefree ((*num)->n_ptr, persistent);
80 pefree(*num, persistent);
81 }
82 *num = NULL;
83 }
84
85
86 /* Intitialize the number package! */
87
88 void
bc_init_numbers(void)89 bc_init_numbers (void)
90 {
91 BCG(_zero_) = _bc_new_num_ex (1,0,1);
92 BCG(_one_) = _bc_new_num_ex (1,0,1);
93 BCG(_one_)->n_value[0] = 1;
94 BCG(_two_) = _bc_new_num_ex (1,0,1);
95 BCG(_two_)->n_value[0] = 2;
96 }
97
98
99 /* Make a copy of a number! Just increments the reference count! */
100
101 bc_num
bc_copy_num(bc_num num)102 bc_copy_num (bc_num num)
103 {
104 num->n_refs++;
105 return num;
106 }
107
108
109 /* Initialize a number NUM by making it a copy of zero. */
110
111 void
bc_init_num(bc_num * num)112 bc_init_num (bc_num *num)
113 {
114 *num = bc_copy_num (BCG(_zero_));
115 }
116