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64 lines
2.0 KiB
C
64 lines
2.0 KiB
C
/* Convert string for NaN payload to corresponding NaN.
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Copyright (C) 1997-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <ieee754.h>
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#include <locale.h>
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#include <math.h>
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#include <stdlib.h>
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#include <wchar.h>
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/* If STR starts with an optional n-char-sequence as defined by ISO C
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(a sequence of ASCII letters, digits and underscores), followed by
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ENDC, return a NaN whose payload is set based on STR. Otherwise,
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return a default NAN. If ENDPTR is not NULL, set *ENDPTR to point
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to the character after the initial n-char-sequence. */
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internal_function
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FLOAT
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STRTOD_NAN (const STRING_TYPE *str, STRING_TYPE **endptr, STRING_TYPE endc)
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{
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const STRING_TYPE *cp = str;
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while ((*cp >= L_('0') && *cp <= L_('9'))
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|| (*cp >= L_('A') && *cp <= L_('Z'))
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|| (*cp >= L_('a') && *cp <= L_('z'))
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|| *cp == L_('_'))
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++cp;
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FLOAT retval = NAN;
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if (*cp != endc)
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goto out;
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/* This is a system-dependent way to specify the bitmask used for
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the NaN. We expect it to be a number which is put in the
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mantissa of the number. */
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STRING_TYPE *endp;
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unsigned long long int mant;
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mant = STRTOULL (str, &endp, 0);
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if (endp == cp)
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SET_MANTISSA (retval, mant);
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out:
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if (endptr != NULL)
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*endptr = (STRING_TYPE *) cp;
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return retval;
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}
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libc_hidden_def (STRTOD_NAN)
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