projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 4acf9396 GCI |
1 | /* @(#)w_log10.c 5.1 93/09/24 */ |
| 2 | /* | |
| 3 | * ==================================================== | |
| 4 | * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. | |
| 5 | * | |
| 6 | * Developed at SunPro, a Sun Microsystems, Inc. business. | |
| 7 | * Permission to use, copy, modify, and distribute this | |
| 8 | * software is freely granted, provided that this notice | |
| 9 | * is preserved. | |
| 10 | * ==================================================== | |
| 11 | */ | |
| 12 | ||
| 13 | #ifndef lint | |
| 14 | static char rcsid[] = "$Id: w_log10.c,v 1.3 1994/02/18 02:27:58 jtc Exp $"; | |
| 15 | #endif | |
| 16 | ||
| 17 | /* | |
| 18 | * wrapper log10(X) | |
| 19 | */ | |
| 20 | ||
| 21 | #include "math.h" | |
| 22 | ||
| 23 | ||
| 24 | #ifdef __STDC__ | |
| 25 | double log10(double x) /* wrapper log10 */ | |
| 26 | #else | |
| 27 | double log10(x) /* wrapper log10 */ | |
| 28 | double x; | |
| 29 | #endif | |
| 30 | { | |
| 31 | #ifdef _IEEE_LIBM | |
| 32 | return __ieee754_log10(x); | |
| 33 | #else | |
| 34 | double z; | |
| 35 | z = __ieee754_log10(x); | |
| 36 | if(_LIB_VERSION == _IEEE_ || isnan(x)) return z; | |
| 37 | if(x<=0.0) { | |
| 38 | if(x==0.0) | |
| 39 | return __kernel_standard(x,x,18); /* log10(0) */ | |
| 40 | else | |
| 41 | return __kernel_standard(x,x,19); /* log10(x<0) */ | |
| 42 | } else | |
| 43 | return z; | |
| 44 | #endif | |
| 45 | } |