xref: /PHP-5.6/ext/bcmath/libbcmath/src/num2str.c (revision d0ee4977)
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.  (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 /* Convert a numbers to a string.  Base 10 only.*/
42 
43 char
bc_num2str(num)44 *bc_num2str (num)
45       bc_num num;
46 {
47   char *str, *sptr;
48   char *nptr;
49   int  index, signch;
50 
51   /* Allocate the string memory. */
52   signch = ( num->n_sign == PLUS ? 0 : 1 );  /* Number of sign chars. */
53   if (num->n_scale > 0)
54     str = (char *) safe_emalloc (1, num->n_len + num->n_scale, 2 + signch);
55   else
56     str = (char *) safe_emalloc (1, num->n_len, 1 + signch);
57   if (str == NULL) bc_out_of_memory();
58 
59   /* The negative sign if needed. */
60   sptr = str;
61   if (signch) *sptr++ = '-';
62 
63   /* Load the whole number. */
64   nptr = num->n_value;
65   for (index=num->n_len; index>0; index--)
66     *sptr++ = BCD_CHAR(*nptr++);
67 
68   /* Now the fraction. */
69   if (num->n_scale > 0)
70     {
71       *sptr++ = '.';
72       for (index=0; index<num->n_scale; index++)
73 	*sptr++ = BCD_CHAR(*nptr++);
74     }
75 
76   /* Terminate the string and return it! */
77   *sptr = '\0';
78   return (str);
79 }
80