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 #define _GNU_SOURCE
37 #include "ftoa_engine.h"
38 #include <_ansi.h>
39 #include <stdlib.h>
40 #include <string.h>
41
42 int
ecvtf_r(float invalue,int ndigit,int * decpt,int * sign,char * buf,size_t len)43 ecvtf_r (float invalue,
44 int ndigit,
45 int *decpt,
46 int *sign,
47 char *buf,
48 size_t len)
49 {
50 struct ftoa ftoa;
51 int ngot;
52
53 if (ndigit < 0)
54 ndigit = 0;
55
56 if ((size_t) ndigit > len - 1)
57 return -1;
58
59 ngot = __ftoa_engine(invalue, &ftoa, ndigit, false, 0);
60 *sign = !!(ftoa.flags & FTOA_MINUS);
61 *decpt = ftoa.exp + 1;
62 memset(buf, '0', ndigit);
63 memcpy(buf, ftoa.digits, ngot);
64 buf[ndigit] = '\0';
65 return 0;
66 }
67
