96 lines
2.0 KiB
C
96 lines
2.0 KiB
C
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/* _WStopfx function */
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#include <wctype.h>
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#include "xmath.h"
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_C_STD_BEGIN
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#if !defined(MRTDLL)
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_C_LIB_DECL
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#endif /* defined(MRTDLL) */
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_CRTIMP2_PURE int __CLRCALL_PURE_OR_CDECL _WStopfx(const wchar_t **ps, wchar_t **endptr)
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{ /* parse prefix of floating-point field */
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const wchar_t *s = *ps;
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int code = 0;
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for (; iswspace(*s); ++s)
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;
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if (*s == L'-')
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code = FL_NEG, ++s;
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else if (*s == L'+')
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++s;
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if (*s == L'n' || *s == L'N')
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{ /* parse "nan" or fail */
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if ((*++s != L'a' && *s != L'A')
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|| (*++s != L'n' && *s != L'N'))
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{ /* parse failed, roll back pointer */
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s = *ps;
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code = FL_ERR;
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}
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else
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{ /* parse optional (n-char-sequence) */
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const wchar_t *q = ++s;
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code = FL_NAN;
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if (*q == L'(')
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{ /* got L'(', skip through L')' */
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for (; iswalnum(*++q) || *q == L'_'; )
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;
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if (*q == L')')
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s = ++q;
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}
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}
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if (endptr != 0)
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*endptr = (wchar_t *)s;
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}
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else if (*s == L'i' || *s == L'I')
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{ /* parse "inf" or fail */
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if ((*++s != L'n' && *s != L'N')
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|| (*++s != L'f' && *s != L'F'))
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{ /* parse failed, roll back pointer */
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s = *ps;
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code = FL_ERR;
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}
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else
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{ /* parse optional rest of L"infinity" */
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const wchar_t *q = ++s;
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code |= FL_INF;
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if ((*q == L'i' || *q == L'I')
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&& (*++q == L'n' || *q == L'N')
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&& (*++q == L'i' || *q == L'I')
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&& (*++q == L't' || *q == L'T')
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&& (*++q == L'y' || *q == L'Y'))
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s = ++q;
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}
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if (endptr != 0)
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*endptr = (wchar_t *)s;
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}
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/* #if _IS_C9X */
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else if (*s == L'0' && (s[1] == L'x' || s[1] == L'X'))
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{ /* test for valid hex field following 0x or 0X */
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const wchar_t *s1 = s + 2;
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if (*s1 == L'.')
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++s1;
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if (!iswxdigit(*s1))
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code |= FL_DEC;
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else
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s += 2, code |= FL_HEX;
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}
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/* #endif _IS_C9X */
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else
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code |= FL_DEC;
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*ps = s;
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return (code);
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}
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#if !defined(MRTDLL)
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_END_C_LIB_DECL
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#endif /* !defined(MRTDLL) */
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_C_STD_END
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/*
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* Copyright (c) 1992-2012 by P.J. Plauger. ALL RIGHTS RESERVED.
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* Consult your license regarding permissions and restrictions.
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V6.00:0009 */
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