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 <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 /* Convert a numbers to a string. Base 10 only.*/
41
42 zend_string
bc_num2str_ex(num,scale)43 *bc_num2str_ex (num, scale)
44 bc_num num;
45 int scale;
46 {
47 zend_string *str;
48 char *sptr;
49 char *nptr;
50 int index, signch;
51
52 /* Allocate the string memory. */
53 signch = num->n_sign != PLUS && !bc_is_zero_for_scale(num, MIN(num->n_scale, scale)); /* Number of sign chars. */
54 if (scale > 0)
55 str = zend_string_alloc(num->n_len + scale + signch + 1, 0);
56 else
57 str = zend_string_alloc(num->n_len + signch, 0);
58 if (str == NULL) bc_out_of_memory();
59
60 /* The negative sign if needed. */
61 sptr = ZSTR_VAL(str);
62 if (signch) *sptr++ = '-';
63
64 /* Load the whole number. */
65 nptr = num->n_value;
66 for (index=num->n_len; index>0; index--)
67 *sptr++ = BCD_CHAR(*nptr++);
68
69 /* Now the fraction. */
70 if (scale > 0)
71 {
72 *sptr++ = '.';
73 for (index=0; index<scale && index<num->n_scale; index++)
74 *sptr++ = BCD_CHAR(*nptr++);
75 for (index = num->n_scale; index<scale; index++)
76 *sptr++ = BCD_CHAR(0);
77 }
78
79 /* Terminate the string and return it! */
80 *sptr = '\0';
81 ZSTR_LEN(str) = sptr - (char *)ZSTR_VAL(str);
82 return str;
83 }
84
