| |
| /* @(#)k_standard.c 1.3 95/01/18 */ |
| /* |
| * ==================================================== |
| * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
| * |
| * Developed at SunSoft, a Sun Microsystems, Inc. business. |
| * Permission to use, copy, modify, and distribute this |
| * software is freely granted, provided that this notice |
| * is preserved. |
| * ==================================================== |
| * |
| */ |
| |
| #include "fdlibm.h" |
| #include <errno.h> |
| |
| #ifndef _USE_WRITE |
| #include <stdio.h> /* fputs(), stderr */ |
| #define WRITE2(u,v) fputs(u, stderr) |
| #else /* !defined(_USE_WRITE) */ |
| #include <unistd.h> /* write */ |
| #define WRITE2(u,v) write(2, u, v) |
| #undef fflush |
| #endif /* !defined(_USE_WRITE) */ |
| |
| static double zero = 0.0; /* used as const */ |
| |
| /* |
| * Standard conformance (non-IEEE) on exception cases. |
| * Mapping: |
| * 1 -- ieee_acos(|x|>1) |
| * 2 -- ieee_asin(|x|>1) |
| * 3 -- ieee_atan2(+-0,+-0) |
| * 4 -- hypot overflow |
| * 5 -- cosh overflow |
| * 6 -- exp overflow |
| * 7 -- exp underflow |
| * 8 -- ieee_y0(0) |
| * 9 -- ieee_y0(-ve) |
| * 10-- ieee_y1(0) |
| * 11-- ieee_y1(-ve) |
| * 12-- ieee_yn(0) |
| * 13-- ieee_yn(-ve) |
| * 14-- ieee_lgamma(finite) overflow |
| * 15-- ieee_lgamma(-integer) |
| * 16-- ieee_log(0) |
| * 17-- ieee_log(x<0) |
| * 18-- ieee_log10(0) |
| * 19-- ieee_log10(x<0) |
| * 20-- ieee_pow(0.0,0.0) |
| * 21-- ieee_pow(x,y) overflow |
| * 22-- ieee_pow(x,y) underflow |
| * 23-- ieee_pow(0,negative) |
| * 24-- ieee_pow(neg,non-integral) |
| * 25-- ieee_sinh(finite) overflow |
| * 26-- ieee_sqrt(negative) |
| * 27-- ieee_fmod(x,0) |
| * 28-- ieee_remainder(x,0) |
| * 29-- acosh(x<1) |
| * 30-- atanh(|x|>1) |
| * 31-- atanh(|x|=1) |
| * 32-- scalb overflow |
| * 33-- scalb underflow |
| * 34-- ieee_j0(|x|>X_TLOSS) |
| * 35-- ieee_y0(x>X_TLOSS) |
| * 36-- ieee_j1(|x|>X_TLOSS) |
| * 37-- ieee_y1(x>X_TLOSS) |
| * 38-- ieee_jn(|x|>X_TLOSS, n) |
| * 39-- ieee_yn(x>X_TLOSS, n) |
| * 40-- ieee_gamma(finite) overflow |
| * 41-- ieee_gamma(-integer) |
| * 42-- ieee_pow(NaN,0.0) |
| */ |
| |
| |
| #ifdef __STDC__ |
| double __kernel_standard(double x, double y, int type) |
| #else |
| double __kernel_standard(x,y,type) |
| double x,y; int type; |
| #endif |
| { |
| struct exception exc; |
| #ifndef HUGE_VAL /* this is the only routine that uses HUGE_VAL */ |
| #define HUGE_VAL inf |
| double inf = 0.0; |
| |
| __HI(inf) = 0x7ff00000; /* set inf to infinite */ |
| #endif |
| |
| #ifdef _USE_WRITE |
| (void) fflush(stdout); |
| #endif |
| exc.arg1 = x; |
| exc.arg2 = y; |
| switch(type) { |
| case 1: |
| /* ieee_acos(|x|>1) */ |
| exc.type = DOMAIN; |
| exc.name = "acos"; |
| exc.retval = zero; |
| if (_LIB_VERSION == _POSIX_) |
| errno = EDOM; |
| else if (!ieee_matherr(&exc)) { |
| if(_LIB_VERSION == _SVID_) { |
| (void) WRITE2("acos: DOMAIN error\n", 19); |
| } |
| errno = EDOM; |
| } |
| break; |
| case 2: |
| /* ieee_asin(|x|>1) */ |
| exc.type = DOMAIN; |
| exc.name = "asin"; |
| exc.retval = zero; |
| if(_LIB_VERSION == _POSIX_) |
| errno = EDOM; |
| else if (!ieee_matherr(&exc)) { |
| if(_LIB_VERSION == _SVID_) { |
| (void) WRITE2("asin: DOMAIN error\n", 19); |
| } |
| errno = EDOM; |
| } |
| break; |
| case 3: |
| /* ieee_atan2(+-0,+-0) */ |
| exc.arg1 = y; |
| exc.arg2 = x; |
| exc.type = DOMAIN; |
| exc.name = "atan2"; |
| exc.retval = zero; |
| if(_LIB_VERSION == _POSIX_) |
| errno = EDOM; |
| else if (!ieee_matherr(&exc)) { |
| if(_LIB_VERSION == _SVID_) { |
| (void) WRITE2("atan2: DOMAIN error\n", 20); |
| } |
| errno = EDOM; |
| } |
| break; |
| case 4: |
| /* ieee_hypot(finite,finite) overflow */ |
| exc.type = OVERFLOW; |
| exc.name = "hypot"; |
| if (_LIB_VERSION == _SVID_) |
| exc.retval = HUGE; |
| else |
| exc.retval = HUGE_VAL; |
| if (_LIB_VERSION == _POSIX_) |
| errno = ERANGE; |
| else if (!ieee_matherr(&exc)) { |
| errno = ERANGE; |
| } |
| break; |
| case 5: |
| /* ieee_cosh(finite) overflow */ |
| exc.type = OVERFLOW; |
| exc.name = "cosh"; |
| if (_LIB_VERSION == _SVID_) |
| exc.retval = HUGE; |
| else |
| exc.retval = HUGE_VAL; |
| if (_LIB_VERSION == _POSIX_) |
| errno = ERANGE; |
| else if (!ieee_matherr(&exc)) { |
| errno = ERANGE; |
| } |
| break; |
| case 6: |
| /* ieee_exp(finite) overflow */ |
| exc.type = OVERFLOW; |
| exc.name = "exp"; |
| if (_LIB_VERSION == _SVID_) |
| exc.retval = HUGE; |
| else |
| exc.retval = HUGE_VAL; |
| if (_LIB_VERSION == _POSIX_) |
| errno = ERANGE; |
| else if (!ieee_matherr(&exc)) { |
| errno = ERANGE; |
| } |
| break; |
| case 7: |
| /* ieee_exp(finite) underflow */ |
| exc.type = UNDERFLOW; |
| exc.name = "exp"; |
| exc.retval = zero; |
| if (_LIB_VERSION == _POSIX_) |
| errno = ERANGE; |
| else if (!ieee_matherr(&exc)) { |
| errno = ERANGE; |
| } |
| break; |
| case 8: |
| /* ieee_y0(0) = -inf */ |
| exc.type = DOMAIN; /* should be SING for IEEE */ |
| exc.name = "y0"; |
| if (_LIB_VERSION == _SVID_) |
| exc.retval = -HUGE; |
| else |
| exc.retval = -HUGE_VAL; |
| if (_LIB_VERSION == _POSIX_) |
| errno = EDOM; |
| else if (!ieee_matherr(&exc)) { |
| if (_LIB_VERSION == _SVID_) { |
| (void) WRITE2("y0: DOMAIN error\n", 17); |
| } |
| errno = EDOM; |
| } |
| break; |
| case 9: |
| /* ieee_y0(x<0) = NaN */ |
| exc.type = DOMAIN; |
| exc.name = "y0"; |
| if (_LIB_VERSION == _SVID_) |
| exc.retval = -HUGE; |
| else |
| exc.retval = -HUGE_VAL; |
| if (_LIB_VERSION == _POSIX_) |
| errno = EDOM; |
| else if (!ieee_matherr(&exc)) { |
| if (_LIB_VERSION == _SVID_) { |
| (void) WRITE2("y0: DOMAIN error\n", 17); |
| } |
| errno = EDOM; |
| } |
| break; |
| case 10: |
| /* ieee_y1(0) = -inf */ |
| exc.type = DOMAIN; /* should be SING for IEEE */ |
| exc.name = "y1"; |
| if (_LIB_VERSION == _SVID_) |
| exc.retval = -HUGE; |
| else |
| exc.retval = -HUGE_VAL; |
| if (_LIB_VERSION == _POSIX_) |
| errno = EDOM; |
| else if (!ieee_matherr(&exc)) { |
| if (_LIB_VERSION == _SVID_) { |
| (void) WRITE2("y1: DOMAIN error\n", 17); |
| } |
| errno = EDOM; |
| } |
| break; |
| case 11: |
| /* ieee_y1(x<0) = NaN */ |
| exc.type = DOMAIN; |
| exc.name = "y1"; |
| if (_LIB_VERSION == _SVID_) |
| exc.retval = -HUGE; |
| else |
| exc.retval = -HUGE_VAL; |
| if (_LIB_VERSION == _POSIX_) |
| errno = EDOM; |
| else if (!ieee_matherr(&exc)) { |
| if (_LIB_VERSION == _SVID_) { |
| (void) WRITE2("y1: DOMAIN error\n", 17); |
| } |
| errno = EDOM; |
| } |
| break; |
| case 12: |
| /* ieee_yn(n,0) = -inf */ |
| exc.type = DOMAIN; /* should be SING for IEEE */ |
| exc.name = "yn"; |
| if (_LIB_VERSION == _SVID_) |
| exc.retval = -HUGE; |
| else |
| exc.retval = -HUGE_VAL; |
| if (_LIB_VERSION == _POSIX_) |
| errno = EDOM; |
| else if (!ieee_matherr(&exc)) { |
| if (_LIB_VERSION == _SVID_) { |
| (void) WRITE2("yn: DOMAIN error\n", 17); |
| } |
| errno = EDOM; |
| } |
| break; |
| case 13: |
| /* ieee_yn(x<0) = NaN */ |
| exc.type = DOMAIN; |
| exc.name = "yn"; |
| if (_LIB_VERSION == _SVID_) |
| exc.retval = -HUGE; |
| else |
| exc.retval = -HUGE_VAL; |
| if (_LIB_VERSION == _POSIX_) |
| errno = EDOM; |
| else if (!ieee_matherr(&exc)) { |
| if (_LIB_VERSION == _SVID_) { |
| (void) WRITE2("yn: DOMAIN error\n", 17); |
| } |
| errno = EDOM; |
| } |
| break; |
| case 14: |
| /* ieee_lgamma(finite) overflow */ |
| exc.type = OVERFLOW; |
| exc.name = "lgamma"; |
| if (_LIB_VERSION == _SVID_) |
| exc.retval = HUGE; |
| else |
| exc.retval = HUGE_VAL; |
| if (_LIB_VERSION == _POSIX_) |
| errno = ERANGE; |
| else if (!ieee_matherr(&exc)) { |
| errno = ERANGE; |
| } |
| break; |
| case 15: |
| /* ieee_lgamma(-integer) or ieee_lgamma(0) */ |
| exc.type = SING; |
| exc.name = "lgamma"; |
| if (_LIB_VERSION == _SVID_) |
| exc.retval = HUGE; |
| else |
| exc.retval = HUGE_VAL; |
| if (_LIB_VERSION == _POSIX_) |
| errno = EDOM; |
| else if (!ieee_matherr(&exc)) { |
| if (_LIB_VERSION == _SVID_) { |
| (void) WRITE2("lgamma: SING error\n", 19); |
| } |
| errno = EDOM; |
| } |
| break; |
| case 16: |
| /* ieee_log(0) */ |
| exc.type = SING; |
| exc.name = "log"; |
| if (_LIB_VERSION == _SVID_) |
| exc.retval = -HUGE; |
| else |
| exc.retval = -HUGE_VAL; |
| if (_LIB_VERSION == _POSIX_) |
| errno = ERANGE; |
| else if (!ieee_matherr(&exc)) { |
| if (_LIB_VERSION == _SVID_) { |
| (void) WRITE2("log: SING error\n", 16); |
| } |
| errno = EDOM; |
| } |
| break; |
| case 17: |
| /* ieee_log(x<0) */ |
| exc.type = DOMAIN; |
| exc.name = "log"; |
| if (_LIB_VERSION == _SVID_) |
| exc.retval = -HUGE; |
| else |
| exc.retval = -HUGE_VAL; |
| if (_LIB_VERSION == _POSIX_) |
| errno = EDOM; |
| else if (!ieee_matherr(&exc)) { |
| if (_LIB_VERSION == _SVID_) { |
| (void) WRITE2("log: DOMAIN error\n", 18); |
| } |
| errno = EDOM; |
| } |
| break; |
| case 18: |
| /* ieee_log10(0) */ |
| exc.type = SING; |
| exc.name = "log10"; |
| if (_LIB_VERSION == _SVID_) |
| exc.retval = -HUGE; |
| else |
| exc.retval = -HUGE_VAL; |
| if (_LIB_VERSION == _POSIX_) |
| errno = ERANGE; |
| else if (!ieee_matherr(&exc)) { |
| if (_LIB_VERSION == _SVID_) { |
| (void) WRITE2("log10: SING error\n", 18); |
| } |
| errno = EDOM; |
| } |
| break; |
| case 19: |
| /* ieee_log10(x<0) */ |
| exc.type = DOMAIN; |
| exc.name = "log10"; |
| if (_LIB_VERSION == _SVID_) |
| exc.retval = -HUGE; |
| else |
| exc.retval = -HUGE_VAL; |
| if (_LIB_VERSION == _POSIX_) |
| errno = EDOM; |
| else if (!ieee_matherr(&exc)) { |
| if (_LIB_VERSION == _SVID_) { |
| (void) WRITE2("log10: DOMAIN error\n", 20); |
| } |
| errno = EDOM; |
| } |
| break; |
| case 20: |
| /* ieee_pow(0.0,0.0) */ |
| /* error only if _LIB_VERSION == _SVID_ */ |
| exc.type = DOMAIN; |
| exc.name = "pow"; |
| exc.retval = zero; |
| if (_LIB_VERSION != _SVID_) exc.retval = 1.0; |
| else if (!ieee_matherr(&exc)) { |
| (void) WRITE2("pow(0,0): DOMAIN error\n", 23); |
| errno = EDOM; |
| } |
| break; |
| case 21: |
| /* ieee_pow(x,y) overflow */ |
| exc.type = OVERFLOW; |
| exc.name = "pow"; |
| if (_LIB_VERSION == _SVID_) { |
| exc.retval = HUGE; |
| y *= 0.5; |
| if(x<zero&&ieee_rint(y)!=y) exc.retval = -HUGE; |
| } else { |
| exc.retval = HUGE_VAL; |
| y *= 0.5; |
| if(x<zero&&ieee_rint(y)!=y) exc.retval = -HUGE_VAL; |
| } |
| if (_LIB_VERSION == _POSIX_) |
| errno = ERANGE; |
| else if (!ieee_matherr(&exc)) { |
| errno = ERANGE; |
| } |
| break; |
| case 22: |
| /* ieee_pow(x,y) underflow */ |
| exc.type = UNDERFLOW; |
| exc.name = "pow"; |
| exc.retval = zero; |
| if (_LIB_VERSION == _POSIX_) |
| errno = ERANGE; |
| else if (!ieee_matherr(&exc)) { |
| errno = ERANGE; |
| } |
| break; |
| case 23: |
| /* 0**neg */ |
| exc.type = DOMAIN; |
| exc.name = "pow"; |
| if (_LIB_VERSION == _SVID_) |
| exc.retval = zero; |
| else |
| exc.retval = -HUGE_VAL; |
| if (_LIB_VERSION == _POSIX_) |
| errno = EDOM; |
| else if (!ieee_matherr(&exc)) { |
| if (_LIB_VERSION == _SVID_) { |
| (void) WRITE2("pow(0,neg): DOMAIN error\n", 25); |
| } |
| errno = EDOM; |
| } |
| break; |
| case 24: |
| /* neg**non-integral */ |
| exc.type = DOMAIN; |
| exc.name = "pow"; |
| if (_LIB_VERSION == _SVID_) |
| exc.retval = zero; |
| else |
| exc.retval = zero/zero; /* X/Open allow NaN */ |
| if (_LIB_VERSION == _POSIX_) |
| errno = EDOM; |
| else if (!ieee_matherr(&exc)) { |
| if (_LIB_VERSION == _SVID_) { |
| (void) WRITE2("neg**non-integral: DOMAIN error\n", 32); |
| } |
| errno = EDOM; |
| } |
| break; |
| case 25: |
| /* ieee_sinh(finite) overflow */ |
| exc.type = OVERFLOW; |
| exc.name = "sinh"; |
| if (_LIB_VERSION == _SVID_) |
| exc.retval = ( (x>zero) ? HUGE : -HUGE); |
| else |
| exc.retval = ( (x>zero) ? HUGE_VAL : -HUGE_VAL); |
| if (_LIB_VERSION == _POSIX_) |
| errno = ERANGE; |
| else if (!ieee_matherr(&exc)) { |
| errno = ERANGE; |
| } |
| break; |
| case 26: |
| /* ieee_sqrt(x<0) */ |
| exc.type = DOMAIN; |
| exc.name = "sqrt"; |
| if (_LIB_VERSION == _SVID_) |
| exc.retval = zero; |
| else |
| exc.retval = zero/zero; |
| if (_LIB_VERSION == _POSIX_) |
| errno = EDOM; |
| else if (!ieee_matherr(&exc)) { |
| if (_LIB_VERSION == _SVID_) { |
| (void) WRITE2("sqrt: DOMAIN error\n", 19); |
| } |
| errno = EDOM; |
| } |
| break; |
| case 27: |
| /* ieee_fmod(x,0) */ |
| exc.type = DOMAIN; |
| exc.name = "fmod"; |
| if (_LIB_VERSION == _SVID_) |
| exc.retval = x; |
| else |
| exc.retval = zero/zero; |
| if (_LIB_VERSION == _POSIX_) |
| errno = EDOM; |
| else if (!ieee_matherr(&exc)) { |
| if (_LIB_VERSION == _SVID_) { |
| (void) WRITE2("fmod: DOMAIN error\n", 20); |
| } |
| errno = EDOM; |
| } |
| break; |
| case 28: |
| /* ieee_remainder(x,0) */ |
| exc.type = DOMAIN; |
| exc.name = "remainder"; |
| exc.retval = zero/zero; |
| if (_LIB_VERSION == _POSIX_) |
| errno = EDOM; |
| else if (!ieee_matherr(&exc)) { |
| if (_LIB_VERSION == _SVID_) { |
| (void) WRITE2("remainder: DOMAIN error\n", 24); |
| } |
| errno = EDOM; |
| } |
| break; |
| case 29: |
| /* acosh(x<1) */ |
| exc.type = DOMAIN; |
| exc.name = "acosh"; |
| exc.retval = zero/zero; |
| if (_LIB_VERSION == _POSIX_) |
| errno = EDOM; |
| else if (!ieee_matherr(&exc)) { |
| if (_LIB_VERSION == _SVID_) { |
| (void) WRITE2("acosh: DOMAIN error\n", 20); |
| } |
| errno = EDOM; |
| } |
| break; |
| case 30: |
| /* atanh(|x|>1) */ |
| exc.type = DOMAIN; |
| exc.name = "atanh"; |
| exc.retval = zero/zero; |
| if (_LIB_VERSION == _POSIX_) |
| errno = EDOM; |
| else if (!ieee_matherr(&exc)) { |
| if (_LIB_VERSION == _SVID_) { |
| (void) WRITE2("atanh: DOMAIN error\n", 20); |
| } |
| errno = EDOM; |
| } |
| break; |
| case 31: |
| /* atanh(|x|=1) */ |
| exc.type = SING; |
| exc.name = "atanh"; |
| exc.retval = x/zero; /* sign(x)*inf */ |
| if (_LIB_VERSION == _POSIX_) |
| errno = EDOM; |
| else if (!ieee_matherr(&exc)) { |
| if (_LIB_VERSION == _SVID_) { |
| (void) WRITE2("atanh: SING error\n", 18); |
| } |
| errno = EDOM; |
| } |
| break; |
| case 32: |
| /* scalb overflow; SVID also returns +-HUGE_VAL */ |
| exc.type = OVERFLOW; |
| exc.name = "scalb"; |
| exc.retval = x > zero ? HUGE_VAL : -HUGE_VAL; |
| if (_LIB_VERSION == _POSIX_) |
| errno = ERANGE; |
| else if (!ieee_matherr(&exc)) { |
| errno = ERANGE; |
| } |
| break; |
| case 33: |
| /* scalb underflow */ |
| exc.type = UNDERFLOW; |
| exc.name = "scalb"; |
| exc.retval = ieee_copysign(zero,x); |
| if (_LIB_VERSION == _POSIX_) |
| errno = ERANGE; |
| else if (!ieee_matherr(&exc)) { |
| errno = ERANGE; |
| } |
| break; |
| case 34: |
| /* ieee_j0(|x|>X_TLOSS) */ |
| exc.type = TLOSS; |
| exc.name = "j0"; |
| exc.retval = zero; |
| if (_LIB_VERSION == _POSIX_) |
| errno = ERANGE; |
| else if (!ieee_matherr(&exc)) { |
| if (_LIB_VERSION == _SVID_) { |
| (void) WRITE2(exc.name, 2); |
| (void) WRITE2(": TLOSS error\n", 14); |
| } |
| errno = ERANGE; |
| } |
| break; |
| case 35: |
| /* ieee_y0(x>X_TLOSS) */ |
| exc.type = TLOSS; |
| exc.name = "y0"; |
| exc.retval = zero; |
| if (_LIB_VERSION == _POSIX_) |
| errno = ERANGE; |
| else if (!ieee_matherr(&exc)) { |
| if (_LIB_VERSION == _SVID_) { |
| (void) WRITE2(exc.name, 2); |
| (void) WRITE2(": TLOSS error\n", 14); |
| } |
| errno = ERANGE; |
| } |
| break; |
| case 36: |
| /* ieee_j1(|x|>X_TLOSS) */ |
| exc.type = TLOSS; |
| exc.name = "j1"; |
| exc.retval = zero; |
| if (_LIB_VERSION == _POSIX_) |
| errno = ERANGE; |
| else if (!ieee_matherr(&exc)) { |
| if (_LIB_VERSION == _SVID_) { |
| (void) WRITE2(exc.name, 2); |
| (void) WRITE2(": TLOSS error\n", 14); |
| } |
| errno = ERANGE; |
| } |
| break; |
| case 37: |
| /* ieee_y1(x>X_TLOSS) */ |
| exc.type = TLOSS; |
| exc.name = "y1"; |
| exc.retval = zero; |
| if (_LIB_VERSION == _POSIX_) |
| errno = ERANGE; |
| else if (!ieee_matherr(&exc)) { |
| if (_LIB_VERSION == _SVID_) { |
| (void) WRITE2(exc.name, 2); |
| (void) WRITE2(": TLOSS error\n", 14); |
| } |
| errno = ERANGE; |
| } |
| break; |
| case 38: |
| /* ieee_jn(|x|>X_TLOSS) */ |
| exc.type = TLOSS; |
| exc.name = "jn"; |
| exc.retval = zero; |
| if (_LIB_VERSION == _POSIX_) |
| errno = ERANGE; |
| else if (!ieee_matherr(&exc)) { |
| if (_LIB_VERSION == _SVID_) { |
| (void) WRITE2(exc.name, 2); |
| (void) WRITE2(": TLOSS error\n", 14); |
| } |
| errno = ERANGE; |
| } |
| break; |
| case 39: |
| /* ieee_yn(x>X_TLOSS) */ |
| exc.type = TLOSS; |
| exc.name = "yn"; |
| exc.retval = zero; |
| if (_LIB_VERSION == _POSIX_) |
| errno = ERANGE; |
| else if (!ieee_matherr(&exc)) { |
| if (_LIB_VERSION == _SVID_) { |
| (void) WRITE2(exc.name, 2); |
| (void) WRITE2(": TLOSS error\n", 14); |
| } |
| errno = ERANGE; |
| } |
| break; |
| case 40: |
| /* ieee_gamma(finite) overflow */ |
| exc.type = OVERFLOW; |
| exc.name = "gamma"; |
| if (_LIB_VERSION == _SVID_) |
| exc.retval = HUGE; |
| else |
| exc.retval = HUGE_VAL; |
| if (_LIB_VERSION == _POSIX_) |
| errno = ERANGE; |
| else if (!ieee_matherr(&exc)) { |
| errno = ERANGE; |
| } |
| break; |
| case 41: |
| /* ieee_gamma(-integer) or ieee_gamma(0) */ |
| exc.type = SING; |
| exc.name = "gamma"; |
| if (_LIB_VERSION == _SVID_) |
| exc.retval = HUGE; |
| else |
| exc.retval = HUGE_VAL; |
| if (_LIB_VERSION == _POSIX_) |
| errno = EDOM; |
| else if (!ieee_matherr(&exc)) { |
| if (_LIB_VERSION == _SVID_) { |
| (void) WRITE2("gamma: SING error\n", 18); |
| } |
| errno = EDOM; |
| } |
| break; |
| case 42: |
| /* ieee_pow(NaN,0.0) */ |
| /* error only if _LIB_VERSION == _SVID_ & _XOPEN_ */ |
| exc.type = DOMAIN; |
| exc.name = "pow"; |
| exc.retval = x; |
| if (_LIB_VERSION == _IEEE_ || |
| _LIB_VERSION == _POSIX_) exc.retval = 1.0; |
| else if (!ieee_matherr(&exc)) { |
| errno = EDOM; |
| } |
| break; |
| } |
| return exc.retval; |
| } |
