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/* Error-checking interface to strtod-like functions.
Copyright (C) 1996, 1998, 2003-2004, 2006, 2009-2025 Free Software
Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
/* Written by Jim Meyering. */
#ifndef XSTRTOD_H
#define XSTRTOD_H 1
#ifdef __cplusplus
extern "C" {
#endif
/* Converts the initial portion of the string starting at STR (if PTR != NULL)
or the entire string starting at STR (if PTR == NULL) to a number of type
'double'.
CONVERT should be a conversion function with the same calling conventions
as strtod, such as strtod or c_strtod.
If successful, it returns true, with *RESULT set to the result.
If it fails, it returns false, with *RESULT and errno set.
In total, there are the following cases:
Condition RET *RESULT errno
-----------------------------------------------------------------------------
conversion error: no number parsed false 0.0 EINVAL or 0
PTR == NULL, number parsed but junk after number false value 0
NaN true NaN 0
±Infinity true ±HUGE_VAL 0
overflow false ±HUGE_VAL ERANGE
gradual underflow true near zero 0
flush-to-zero underflow true ±0.0 ERANGE
other finite value true value 0
In both cases, if PTR != NULL, *PTR is set to point to the character after
the parsed number. */
bool xstrtod (const char *str, const char **ptr, double *result,
double (*convert) (char const *, char **));
/* Converts the initial portion of the string starting at STR (if PTR != NULL)
or the entire string starting at STR (if PTR == NULL) to a number of type
'long double'.
CONVERT should be a conversion function with the same calling conventions
as strtold, such as strtold or c_strtold.
If successful, it returns true, with *RESULT set to the result.
If it fails, it returns false, with *RESULT and errno set.
In total, there are the following cases:
Condition RET *RESULT errno
-----------------------------------------------------------------------------
conversion error: no number parsed false 0.0L EINVAL or 0
PTR == NULL, number parsed but junk after number false value 0
NaN true NaN 0
±Infinity true ±HUGE_VALL 0
overflow false ±HUGE_VALL ERANGE
gradual underflow true near zero 0
flush-to-zero underflow true ±0.0L ERANGE
other finite value true value 0
In both cases, if PTR != NULL, *PTR is set to point to the character after
the parsed number. */
bool xstrtold (const char *str, const char **ptr, long double *result,
long double (*convert) (char const *, char **));
#ifdef __cplusplus
}
#endif
#endif /* not XSTRTOD_H */
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