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- /* Convert string for NaN payload to corresponding NaN.
- Copyright (C) 1997-2019 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. */
- 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_NAN_PAYLOAD (retval, mant);
- out:
- if (endptr != NULL)
- *endptr = (STRING_TYPE *) cp;
- return retval;
- }
- libc_hidden_def (STRTOD_NAN)
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