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glibc/stdlib/strtod_nan_main.c
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/* Convert string for NaN payload to corresponding NaN. | |
Copyright (C) 1997-2016 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 <ieee754.h> | |
#include <locale.h> | |
#include <math.h> | |
#include <stdlib.h> | |
#include <wchar.h> | |
/* If STR starts with an optional n-char-sequence as defined by ISO C | |
(a sequence of ASCII letters, digits and underscores), followed by | |
ENDC, return a NaN whose payload is set based on STR. Otherwise, | |
return a default NAN. If ENDPTR is not NULL, set *ENDPTR to point | |
to the character after the initial n-char-sequence. */ | |
internal_function | |
FLOAT | |
STRTOD_NAN (const STRING_TYPE *str, STRING_TYPE **endptr, STRING_TYPE endc) | |
{ | |
const STRING_TYPE *cp = str; | |
while ((*cp >= L_('0') && *cp <= L_('9')) | |
|| (*cp >= L_('A') && *cp <= L_('Z')) | |
|| (*cp >= L_('a') && *cp <= L_('z')) | |
|| *cp == L_('_')) | |
++cp; | |
FLOAT retval = NAN; | |
if (*cp != endc) | |
goto out; | |
/* This is a system-dependent way to specify the bitmask used for | |
the NaN. We expect it to be a number which is put in the | |
mantissa of the number. */ | |
STRING_TYPE *endp; | |
unsigned long long int mant; | |
mant = STRTOULL (str, &endp, 0); | |
if (endp == cp) | |
SET_MANTISSA (retval, mant); | |
out: | |
if (endptr != NULL) | |
*endptr = (STRING_TYPE *) cp; | |
return retval; | |
} | |
libc_hidden_def (STRTOD_NAN) |