1 /* num2str.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 "bcmath.h"
33 #include "convert.h"
34 #include "zend_string.h"
35
36 /* Convert a numbers to a string. Base 10 only.*/
bc_num2str_ex(bc_num num,size_t scale)37 zend_string *bc_num2str_ex(bc_num num, size_t scale)
38 {
39 zend_string *str;
40 char *sptr;
41 size_t index;
42 bool signch;
43 size_t min_scale = MIN(num->n_scale, scale);
44
45 /* Number of sign chars. */
46 signch = num->n_sign != PLUS && !bc_is_zero_for_scale(num, min_scale);
47 /* Allocate the string memory. */
48 if (scale > 0) {
49 str = zend_string_alloc(num->n_len + scale + signch + 1, 0);
50 } else {
51 str = zend_string_alloc(num->n_len + signch, 0);
52 }
53
54 /* The negative sign if needed. */
55 sptr = ZSTR_VAL(str);
56 if (signch) *sptr++ = '-';
57
58 /* Load the whole number. */
59 const char *nptr = num->n_value;
60 sptr = bc_copy_and_toggle_bcd(sptr, nptr, nptr + num->n_len);
61 nptr += num->n_len;
62
63 /* Now the fraction. */
64 if (scale > 0) {
65 *sptr++ = '.';
66 sptr = bc_copy_and_toggle_bcd(sptr, nptr, nptr + min_scale);
67 for (index = num->n_scale; index < scale; index++) {
68 *sptr++ = BCD_CHAR(0);
69 }
70 }
71
72 /* Terminate the string and return it! */
73 *sptr = '\0';
74 ZSTR_LEN(str) = sptr - (char *)ZSTR_VAL(str);
75 return str;
76 }
77
