diff options
Diffstat (limited to 'subprojects/exess/src/decimal.h')
-rw-r--r-- | subprojects/exess/src/decimal.h | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/subprojects/exess/src/decimal.h b/subprojects/exess/src/decimal.h new file mode 100644 index 00000000..7c5aa963 --- /dev/null +++ b/subprojects/exess/src/decimal.h @@ -0,0 +1,63 @@ +/* + Copyright 2019-2021 David Robillard <d@drobilla.net> + + Permission to use, copy, modify, and/or distribute this software for any + purpose with or without fee is hereby granted, provided that the above + copyright notice and this permission notice appear in all copies. + + THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. +*/ + +#ifndef EXESS_DECIMAL_H +#define EXESS_DECIMAL_H + +#include "exess/exess.h" + +#include <stddef.h> + +// Define C11 numeric constants if the compiler hasn't already +#ifndef FLT_DECIMAL_DIG +# define FLT_DECIMAL_DIG 9 +#endif +#ifndef DBL_DECIMAL_DIG +# define DBL_DECIMAL_DIG 17 +#endif + +typedef enum { + EXESS_NEGATIVE, + EXESS_NEGATIVE_INFINITY, + EXESS_NEGATIVE_ZERO, + EXESS_POSITIVE_ZERO, + EXESS_POSITIVE, + EXESS_POSITIVE_INFINITY, + EXESS_NAN, +} ExessNumberKind; + +typedef struct { + ExessNumberKind kind; ///< Kind of number + int expt; ///< Power of 10 exponent + unsigned n_digits; ///< Number of significant digits + char digits[DBL_DECIMAL_DIG + 2]; ///< Significant digits +} ExessDecimalDouble; + +ExessDecimalDouble +exess_measure_decimal(double d, unsigned max_precision); + +ExessDecimalDouble +exess_measure_float(float f); + +ExessDecimalDouble +exess_measure_double(double d); + +ExessResult +exess_write_decimal_double(ExessDecimalDouble decimal, + size_t buf_size, + char* buf); + +#endif // EXESS_DECIMAL_H |