1 /*
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright © 2022 Keith Packard
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above
14 * copyright notice, this list of conditions and the following
15 * disclaimer in the documentation and/or other materials provided
16 * with the distribution.
17 *
18 * 3. Neither the name of the copyright holder nor the names of its
19 * contributors may be used to endorse or promote products derived
20 * from this software without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
23 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
25 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
26 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
27 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
28 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
29 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
31 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
32 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
33 * OF THE POSSIBILITY OF SUCH DAMAGE.
34 */
35
36 #if __SIZEOF_LONG_DOUBLE__ > __SIZEOF_DOUBLE__
37
38 #define _NEED_IO_LONG_DOUBLE
39
40 #include "dtoa.h"
41
42 int
ecvtl_r(long double invalue,int ndigit,int * decpt,int * sign,char * buf,size_t len)43 ecvtl_r (long double invalue,
44 int ndigit,
45 int *decpt,
46 int *sign,
47 char *buf,
48 size_t len)
49 {
50 struct dtoa dtoa;
51 char *digits = dtoa.digits;
52 int ngot;
53
54 if (ndigit < 0)
55 ndigit = 0;
56
57 if ((size_t) ndigit > len - 1)
58 return -1;
59
60 if (!isfinite(invalue)) {
61 *sign = invalue < 0;
62 *decpt = 0;
63 if (isnan(invalue))
64 digits = "nan";
65 else
66 digits = "inf";
67 ngot = 3;
68 if (ndigit < ngot)
69 ngot = ndigit;
70 ndigit = ngot;
71 } else {
72 #ifdef _NEED_IO_FLOAT_LARGE
73 ngot = __ldtoa_engine(invalue, &dtoa, ndigit, false, 0);
74 #elif __SIZEOF_LONG_DOUBLE__ == 8
75 ngot = __dtoa_engine((FLOAT64) invalue, &dtoa, ndigit, false, 0);
76 #elif __SIZEOF_LONG_DOUBLE__ == 4
77 ngot = __ftoa_engine((float) invalue, &dtoa, ndigit, false, 0);
78 #endif
79 *sign = !!(dtoa.flags & DTOA_MINUS);
80 *decpt = dtoa.exp + 1;
81 }
82 memset(buf, '0', ndigit);
83 memcpy(buf, digits, ngot);
84 buf[ndigit] = '\0';
85 return 0;
86 }
87
88 #elif __SIZEOF_LONG_DOUBLE__ == 4
89
90 #include "stdio_private.h"
91
92 int
ecvtl_r(long double invalue,int ndigit,int * decpt,int * sign,char * buf,size_t len)93 ecvtl_r (long double invalue,
94 int ndigit,
95 int *decpt,
96 int *sign,
97 char *buf,
98 size_t len)
99 {
100 return ecvtf_r((float) invalue, ndigit, decpt, sign, buf, len);
101 }
102
103 #elif __SIZEOF_LONG_DOUBLE__ == __SIZEOF_DOUBLE__
104
105 #include "stdio_private.h"
106
107 int
ecvtl_r(long double invalue,int ndigit,int * decpt,int * sign,char * buf,size_t len)108 ecvtl_r (long double invalue,
109 int ndigit,
110 int *decpt,
111 int *sign,
112 char *buf,
113 size_t len)
114 {
115 return ecvt_r((double) invalue, ndigit, decpt, sign, buf, len);
116 }
117
118 #endif
119
