1/* Compatibility functions for floating point formatting.
2 Copyright (C) 1995-2023 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19#include <math.h>
20#include <stdio.h>
21#include <stdlib.h>
22#include <sys/param.h>
23#include <libc-lock.h>
24#include <math_ldbl_opt.h>
25
26#ifndef SPRINTF
27# define SPRINTF sprintf
28#endif
29
30#define APPEND(a, b) APPEND2 (a, b)
31#define APPEND2(a, b) a##b
32
33
34#define FCVT_BUFFER APPEND (FUNC_PREFIX, fcvt_buffer)
35#define FCVT_BUFPTR APPEND (FUNC_PREFIX, fcvt_bufptr)
36#define ECVT_BUFFER APPEND (FUNC_PREFIX, ecvt_buffer)
37
38
39static char FCVT_BUFFER[MAXDIG];
40static char ECVT_BUFFER[MAXDIG];
41libc_freeres_ptr (static char *FCVT_BUFPTR);
42
43char *
44__FCVT (FLOAT_TYPE value, int ndigit, int *decpt, int *sign)
45{
46 if (FCVT_BUFPTR == NULL)
47 {
48 if (__FCVT_R (value, ndigit, decpt, sign, FCVT_BUFFER, MAXDIG) != -1)
49 return FCVT_BUFFER;
50
51 FCVT_BUFPTR = (char *) malloc (FCVT_MAXDIG);
52 if (FCVT_BUFPTR == NULL)
53 return FCVT_BUFFER;
54 }
55
56 (void) __FCVT_R (value, ndigit, decpt, sign, FCVT_BUFPTR, FCVT_MAXDIG);
57
58 return FCVT_BUFPTR;
59}
60
61
62char *
63__ECVT (FLOAT_TYPE value, int ndigit, int *decpt, int *sign)
64{
65 (void) __ECVT_R (value, ndigit, decpt, sign, ECVT_BUFFER, MAXDIG);
66
67 return ECVT_BUFFER;
68}
69
70char *
71__GCVT (FLOAT_TYPE value, int ndigit, char *buf)
72{
73 SPRINTF (buf, "%.*" FLOAT_FMT_FLAG "g", MIN (ndigit, NDIGIT_MAX), value);
74 return buf;
75}
76