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Diffstat (limited to 'REORG.TODO/misc/efgcvt.c')
-rw-r--r-- | REORG.TODO/misc/efgcvt.c | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/REORG.TODO/misc/efgcvt.c b/REORG.TODO/misc/efgcvt.c new file mode 100644 index 0000000000..3a3665a250 --- /dev/null +++ b/REORG.TODO/misc/efgcvt.c @@ -0,0 +1,126 @@ +/* Compatibility functions for floating point formatting. + Copyright (C) 1995-2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +#include <math.h> +#include <stdio.h> +#include <stdlib.h> +#include <sys/param.h> +#include <float.h> +#include <libc-lock.h> +#include <math_ldbl_opt.h> + +#ifndef FLOAT_TYPE +# define FLOAT_TYPE double +# define FUNC_PREFIX +# define FLOAT_FMT_FLAG +/* Actually we have to write (DBL_DIG + log10 (DBL_MAX_10_EXP)) but we + don't have log10 available in the preprocessor. */ +# define MAXDIG (NDIGIT_MAX + 3) +# define FCVT_MAXDIG (DBL_MAX_10_EXP + MAXDIG) +# if DBL_MANT_DIG == 53 +# define NDIGIT_MAX 17 +# elif DBL_MANT_DIG == 24 +# define NDIGIT_MAX 9 +# elif DBL_MANT_DIG == 56 +# define NDIGIT_MAX 18 +# else +/* See IEEE 854 5.6, table 2 for this formula. Unfortunately we need a + compile time constant here, so we cannot use it. */ +# error "NDIGIT_MAX must be precomputed" +# define NDIGIT_MAX (lrint (ceil (M_LN2 / M_LN10 * DBL_MANT_DIG + 1.0))) +# endif +#else +# define LONG_DOUBLE_CVT +#endif + +#define APPEND(a, b) APPEND2 (a, b) +#define APPEND2(a, b) a##b +#define __APPEND(a, b) __APPEND2 (a, b) +#define __APPEND2(a, b) __##a##b + + +#define FCVT_BUFFER APPEND (FUNC_PREFIX, fcvt_buffer) +#define FCVT_BUFPTR APPEND (FUNC_PREFIX, fcvt_bufptr) +#define ECVT_BUFFER APPEND (FUNC_PREFIX, ecvt_buffer) + + +static char FCVT_BUFFER[MAXDIG]; +static char ECVT_BUFFER[MAXDIG]; +libc_freeres_ptr (static char *FCVT_BUFPTR); + +char * +__APPEND (FUNC_PREFIX, fcvt) (FLOAT_TYPE value, int ndigit, int *decpt, + int *sign) +{ + if (FCVT_BUFPTR == NULL) + { + if (__APPEND (FUNC_PREFIX, fcvt_r) (value, ndigit, decpt, sign, + FCVT_BUFFER, MAXDIG) != -1) + return FCVT_BUFFER; + + FCVT_BUFPTR = (char *) malloc (FCVT_MAXDIG); + if (FCVT_BUFPTR == NULL) + return FCVT_BUFFER; + } + + (void) __APPEND (FUNC_PREFIX, fcvt_r) (value, ndigit, decpt, sign, + FCVT_BUFPTR, FCVT_MAXDIG); + + return FCVT_BUFPTR; +} + + +char * +__APPEND (FUNC_PREFIX, ecvt) (FLOAT_TYPE value, int ndigit, int *decpt, + int *sign) +{ + (void) __APPEND (FUNC_PREFIX, ecvt_r) (value, ndigit, decpt, sign, + ECVT_BUFFER, MAXDIG); + + return ECVT_BUFFER; +} + +char * +__APPEND (FUNC_PREFIX, gcvt) (FLOAT_TYPE value, int ndigit, char *buf) +{ + sprintf (buf, "%.*" FLOAT_FMT_FLAG "g", MIN (ndigit, NDIGIT_MAX), value); + return buf; +} + +#if LONG_DOUBLE_COMPAT (libc, GLIBC_2_0) +# ifdef LONG_DOUBLE_CVT +# define cvt_symbol(symbol) \ + cvt_symbol_1 (libc, __APPEND (FUNC_PREFIX, symbol), \ + APPEND (FUNC_PREFIX, symbol), GLIBC_2_4) +# define cvt_symbol_1(lib, local, symbol, version) \ + versioned_symbol (lib, local, symbol, version) +# else +# define cvt_symbol(symbol) \ + cvt_symbol_1 (libc, __APPEND (FUNC_PREFIX, symbol), \ + APPEND (q, symbol), GLIBC_2_0); \ + strong_alias (__APPEND (FUNC_PREFIX, symbol), APPEND (FUNC_PREFIX, symbol)) +# define cvt_symbol_1(lib, local, symbol, version) \ + compat_symbol (lib, local, symbol, version) +# endif +#else +# define cvt_symbol(symbol) \ + strong_alias (__APPEND (FUNC_PREFIX, symbol), APPEND (FUNC_PREFIX, symbol)) +#endif +cvt_symbol(fcvt); +cvt_symbol(ecvt); +cvt_symbol(gcvt); |