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[glibc/history.git] / math / w_log10f.c
blobc63fcd1ec297265ca4c44afaa6a80353cf63ad49
1 /* w_log10f.c -- float version of w_log10.c.
2 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
3 */
5 /*
6 * ====================================================
7 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
9 * Developed at SunPro, a Sun Microsystems, Inc. business.
10 * Permission to use, copy, modify, and distribute this
11 * software is freely granted, provided that this notice
12 * is preserved.
13 * ====================================================
16 #if defined(LIBM_SCCS) && !defined(lint)
17 static char rcsid[] = "$NetBSD: w_log10f.c,v 1.3 1995/05/10 20:49:37 jtc Exp $";
18 #endif
20 /*
21 * wrapper log10f(X)
24 #include <math.h>
25 #include "math_private.h"
28 #ifdef __STDC__
29 float __log10f(float x) /* wrapper log10f */
30 #else
31 float __log10f(x) /* wrapper log10f */
32 float x;
33 #endif
35 #ifdef _IEEE_LIBM
36 return __ieee754_log10f(x);
37 #else
38 float z;
39 z = __ieee754_log10f(x);
40 if(_LIB_VERSION == _IEEE_ || __isnanf(x)) return z;
41 if(x<=(float)0.0) {
42 if(x==(float)0.0)
43 /* log10(0) */
44 return (float)__kernel_standard((double)x,(double)x,118);
45 else
46 /* log10(x<0) */
47 return (float)__kernel_standard((double)x,(double)x,119);
48 } else
49 return z;
50 #endif
52 weak_alias (__log10f, log10f)