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* libc/locale/locale.c: Use double quotes in code. * libc/locale/locale.tex: Likewise. * libc/libc.texinfo: Hyphenate "floating-point". * libc/machine/necv70/necv70.tex: Likewise. * libc/stdio/sprintf.c: Likewise. * libc/stdio/sscanf.c: Likewise. * libc/stdlib/atof.c: Likewise. * libc/stdlib/ldtoa.c: Fix comment typo. * libc/stdlib/div.c: Use @ifnottex instead of @ifinfo. * libc/stdlib/ldiv.c: Likewise. * libm/common/s_expm1.c: Likewise. * libm/common/s_ilogb.c: Hyphenate "floating-point". Use "nonzero". * libm/common/s_infinity: Hyphenate "double- and single-precision". * libm/common/s_nan.c: Likewise. Also correct the FUNCTION summary. * libm/common/s_nextafter.c: Fix typo. Hyphenate "double-precision" and "floating-point". * libm/common/s_scalbn.c: Correct the FUNCTION summary. * libm/math/e_pow.c: Fix comment typo. * libm/math/math.tex: Hyphenate "single-precision" and "floating-point". * libm/math/s_asinh.c: Use @ifnottex instead of @ifinfo. * libm/math/s_atan.c: Likewise. * libm/math/s_frexp.c: Likewise. Also use "nonzero". * libm/math/s_isnan.c: Hyphenate "single-precision" and "floating-point". Use "nonzero". * libm/math/s_ldexp.c: Use @ifnottex instead of @ifinfo. * libm/math/w_acos.c: Likewise. * libm/math/w_acosh.c: Likewise. * libm/math/w_asin.c: Likewise. * libm/math/w_atan2.c: Likewise. * libm/math/w_atanh.c: Likewise. * libm/math/w_cosh.c: Likewise. * libm/math/w_exp.c: Likewise. * libm/math/w_exp2.c: Likewise. Add missing @end and missing @tex version of 2^x in the description. * libm/math/w_fmod.c: Use @ifnottex instead of @ifinfo. * libm/math/w_gamma.c: Likewise. * libm/math/w_hypot.c: Likewise. * libm/math/w_j0.c: Likewise. * libm/math/w_sinh.c: Likewise. * libm/math/w_pow.c: Replace "exp1.0nt" with "exponent". * libm/mathfp/mathfp.tex: Hyphenate "single-precision" and "floating-point". * libm/mathfp/e_acosh.c: Use @ifnottex instead of @ifinfo. * libm/mathfp/e_atanh.c: Likewise. * libm/mathfp/e_hypot.c: Likewise. * libm/mathfp/er_lgamma.c: Likewise. * libm/mathfp/s_acos.c: Likewise. * libm/mathfp/s_asine.c: Likewise. * libm/mathfp/s_asinh.c: Likewise. * libm/mathfp/s_atan.c: Likewise. * libm/mathfp/s_atan2.c: Likewise. * libm/mathfp/s_atangent.c: Likewise. * libm/mathfp/s_cosh.c: Likewise. * libm/mathfp/s_exp.c: Likewise. * libm/mathfp/s_fmod.c: Likewise. * libm/mathfp/s_frexp.c: Likewise. Also use "nonzero". * libm/mathfp/s_isnan.c: Hyphenate "single-precision" and "floating-point". Use "nonzero". * libm/math/s_pow.c: Replace "exp1.0nt" with "exponent". * libm/mathfp/s_ldexp.c: Use @ifnottex instead of @ifinfo. * libm/mathfp/s_sineh.c: Likewise. * libm/mathfp/w_jn.c: Likewise.
126 lines
2.7 KiB
C
126 lines
2.7 KiB
C
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/* @(#)z_isnan.c 1.0 98/08/13 */
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/*
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FUNCTION
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<<isnan>>,<<isnanf>>,<<isinf>>,<<isinff>>,<<finite>>,<<finitef>>---test
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for exceptional numbers
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INDEX
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isnan
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INDEX
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isinf
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INDEX
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finite
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INDEX
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isnanf
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INDEX
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isinff
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INDEX
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finitef
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ANSI_SYNOPSIS
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#include <ieeefp.h>
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int isnan(double <[arg]>);
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int isinf(double <[arg]>);
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int finite(double <[arg]>);
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int isnanf(float <[arg]>);
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int isinff(float <[arg]>);
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int finitef(float <[arg]>);
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TRAD_SYNOPSIS
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#include <ieeefp.h>
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int isnan(<[arg]>)
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double <[arg]>;
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int isinf(<[arg]>)
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double <[arg]>;
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int finite(<[arg]>);
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double <[arg]>;
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int isnanf(<[arg]>);
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float <[arg]>;
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int isinff(<[arg]>);
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float <[arg]>;
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int finitef(<[arg]>);
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float <[arg]>;
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DESCRIPTION
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These functions provide information on the floating-point
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argument supplied.
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There are five major number formats -
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o+
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o zero
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a number which contains all zero bits.
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o subnormal
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Is used to represent number with a zero exponent, but a nonzero fract
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ion.
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o normal
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A number with an exponent, and a fraction
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o infinity
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A number with an all 1's exponent and a zero fraction.
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o NAN
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A number with an all 1's exponent and a nonzero fraction.
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o-
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<<isnan>> returns 1 if the argument is a nan. <<isinf>>
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returns 1 if the argument is infinity. <<finite>> returns 1 if the
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argument is zero, subnormal or normal.
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The <<isnanf>>, <<isinff>> and <<finitef>> perform the same
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operations as their <<isnan>>, <<isinf>> and <<finite>>
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counterparts, but on single-precision floating-point numbers.
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QUICKREF
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isnan - pure
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QUICKREF
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isinf - pure
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QUICKREF
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finite - pure
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QUICKREF
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isnan - pure
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QUICKREF
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isinf - pure
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QUICKREF
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finite - pure
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*/
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/******************************************************************
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* isnan
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*
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* Input:
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* x - pointer to a floating-point value
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*
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* Output:
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* An integer that indicates if the number is NaN.
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*
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* Description:
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* This routine returns an integer that indicates if the number
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* passed in is NaN (1) or is finite (0).
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*
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*****************************************************************/
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#include "fdlibm.h"
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#include "zmath.h"
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#ifndef _DOUBLE_IS_32BITS
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int isnan (double x)
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{
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__uint32_t lx, hx;
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int exp;
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EXTRACT_WORDS (hx, lx, x);
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exp = (hx & 0x7ff00000) >> 20;
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if ((exp == 0x7ff) && (hx & 0xf0000 || lx))
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return (1);
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else
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return (0);
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}
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#endif /* _DOUBLE_IS_32BITS */
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