xref: /PHP-7.4/ext/bcmath/libbcmath/src/num2str.c (revision bcb89c75)
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