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