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
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 }