1 /*
2 +----------------------------------------------------------------------+
3 | Copyright (c) The PHP Group |
4 +----------------------------------------------------------------------+
5 | This source file is subject to version 3.01 of the PHP license, |
6 | that is bundled with this package in the file LICENSE, and is |
7 | available through the world-wide-web at the following url: |
8 | https://www.php.net/license/3_01.txt |
9 | If you did not receive a copy of the PHP license and are unable to |
10 | obtain it through the world-wide-web, please send a note to |
11 | license@php.net so we can mail you a copy immediately. |
12 +----------------------------------------------------------------------+
13 | Authors: Saki Takamachi <saki@php.net> |
14 +----------------------------------------------------------------------+
15 */
16
17 #include "bcmath.h"
18 #include "private.h"
19 #include <stddef.h>
20
bc_floor_or_ceil(bc_num num,bool is_floor)21 bc_num bc_floor_or_ceil(bc_num num, bool is_floor)
22 {
23 /* Initialize result */
24 bc_num result = bc_new_num(num->n_len, 0);
25 result->n_sign = num->n_sign;
26
27 /* copy integer part */
28 memcpy(result->n_value, num->n_value, num->n_len);
29
30 /* If the number is positive and we are flooring, then nothing else needs to be done.
31 * Similarly, if the number is negative and we are ceiling, then nothing else needs to be done. */
32 if (num->n_scale == 0 || result->n_sign == (is_floor ? PLUS : MINUS)) {
33 goto check_zero;
34 }
35
36 /* check fractional part. */
37 size_t count = num->n_scale;
38 const char *nptr = num->n_value + num->n_len;
39 while ((count > 0) && (*nptr == 0)) {
40 count--;
41 nptr++;
42 }
43
44 /* If all digits past the decimal point are 0 */
45 if (count == 0) {
46 goto check_zero;
47 }
48
49 /* Increment the absolute value of the result by 1 and add sign information */
50 bc_num tmp = _bc_do_add(result, BCG(_one_));
51 tmp->n_sign = result->n_sign;
52 bc_free_num(&result);
53 result = tmp;
54
55 check_zero:
56 if (bc_is_zero(result)) {
57 result->n_sign = PLUS;
58 }
59
60 return result;
61 }
62
