mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-27 15:30:07 +00:00
64 lines
2.0 KiB
C
64 lines
2.0 KiB
C
/* 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)
|