xref: /illumos-gate/usr/src/lib/libc/amd64/gen/ecvt.c (revision 7257d1b4)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License (the "License").
6  * You may not use this file except in compliance with the License.
7  *
8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9  * or http://www.opensolaris.org/os/licensing.
10  * See the License for the specific language governing permissions
11  * and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL HEADER in each
14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15  * If applicable, add the following below this CDDL HEADER, with the
16  * fields enclosed by brackets "[]" replaced with your own identifying
17  * information: Portions Copyright [yyyy] [name of copyright owner]
18  *
19  * CDDL HEADER END
20  */
21 
22 /*
23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
24  * Use is subject to license terms.
25  */
26 
27 /*	Copyright (c) 1988 AT&T	*/
28 /*	  All Rights Reserved	*/
29 
30 #pragma ident	"%Z%%M%	%I%	%E% SMI"
31 
32 /*
33  *	ecvt converts to decimal
34  *	the number of digits is specified by ndigit
35  *	decpt is set to the position of the decimal point
36  *	sign is set to 0 for positive, 1 for negative
37  *
38  */
39 
40 #pragma weak _ecvt = ecvt
41 #pragma weak _fcvt = fcvt
42 
43 #include "lint.h"
44 #include <sys/types.h>
45 #include <stdlib.h>
46 #include <floatingpoint.h>
47 #include "tsd.h"
48 
49 char *
ecvt(number,ndigits,decpt,sign)50 ecvt(number, ndigits, decpt, sign)
51 	double	number;
52 	int	ndigits;
53 	int	*decpt;
54 	int	*sign;
55 {
56 	char *buf = tsdalloc(_T_ECVT, DECIMAL_STRING_LENGTH, NULL);
57 
58 	return (econvert(number, ndigits, decpt, sign, buf));
59 }
60 
61 char *
fcvt(number,ndigits,decpt,sign)62 fcvt(number, ndigits, decpt, sign)
63 	double	number;
64 	int	ndigits;
65 	int	*decpt;
66 	int	*sign;
67 {
68 	char *buf = tsdalloc(_T_ECVT, DECIMAL_STRING_LENGTH, NULL);
69 	char *ptr, *val;
70 	char ch;
71 	int deci_val;
72 
73 	ptr = fconvert(number, ndigits, decpt, sign, buf);
74 	val = ptr;
75 	deci_val = *decpt;
76 
77 	while ((ch = *ptr) != '\0') {
78 		if (ch != '0') { /* You execute this if there are no */
79 				/* leading zero's remaining. */
80 			*decpt = deci_val; /* If there are leading zero's */
81 			return (ptr);	/* gets updated. */
82 		}
83 		ptr++;
84 		deci_val--;
85 	}
86 	return (val);
87 }
88 
89 char *
qecvt(number,ndigits,decpt,sign)90 qecvt(number, ndigits, decpt, sign)
91 	long double	number;
92 	int		ndigits;
93 	int		*decpt;
94 	int		*sign;
95 {
96 	char *buf = tsdalloc(_T_ECVT, DECIMAL_STRING_LENGTH, NULL);
97 
98 	return (qeconvert(&number, ndigits, decpt, sign, buf));
99 }
100 
101 char *
qfcvt(number,ndigits,decpt,sign)102 qfcvt(number, ndigits, decpt, sign)
103 	long double	number;
104 	int		ndigits;
105 	int		*decpt;
106 	int		*sign;
107 {
108 	char *buf = tsdalloc(_T_ECVT, DECIMAL_STRING_LENGTH, NULL);
109 
110 	return (qfconvert(&number, ndigits, decpt, sign, buf));
111 }
112 
113 char *
qgcvt(number,ndigits,buffer)114 qgcvt(number, ndigits, buffer)
115 	long double	number;
116 	int		ndigits;
117 	char		*buffer;
118 {
119 	return (qgconvert(&number, ndigits, 0, buffer));
120 }
121