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[/] [or1k/] [trunk/] [newlib/] [newlib/] [libm/] [math/] [w_log10.c] - Blame information for rev 1765

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/* @(#)w_log10.c 5.1 93/09/24 */
/*
 * ====================================================
 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
 *
 * Developed at SunPro, a Sun Microsystems, Inc. business.
 * Permission to use, copy, modify, and distribute this
 * software is freely granted, provided that this notice
 * is preserved.
 * ====================================================
 */
 
/*
FUNCTION
        <<log10>>, <<log10f>>---base 10 logarithms
 
INDEX
log10
INDEX
log10f
 
ANSI_SYNOPSIS
        #include <math.h>
        double log10(double <[x]>);
        float log10f(float <[x]>);
 
TRAD_SYNOPSIS
        #include <math.h>
        double log10(<[x]>)
        double <[x]>;
 
        float log10f(<[x]>)
        float <[x]>;
 
DESCRIPTION
<<log10>> returns the base 10 logarithm of <[x]>.
It is implemented as <<log(<[x]>) / log(10)>>.
 
<<log10f>> is identical, save that it takes and returns <<float>> values.
 
RETURNS
<<log10>> and <<log10f>> return the calculated value.
 
See the description of <<log>> for information on errors.
 
PORTABILITY
<<log10>> is ANSI C.  <<log10f>> is an extension.
 
 */
 
/*
 * wrapper log10(X)
 */
 
#include "fdlibm.h"
#include <errno.h>
 
#ifndef _DOUBLE_IS_32BITS
 
#ifdef __STDC__
        double log10(double x)          /* wrapper log10 */
#else
        double log10(x)                 /* wrapper log10 */
        double x;
#endif
{
#ifdef _IEEE_LIBM
        return __ieee754_log10(x);
#else
        double z;
        struct exception exc;
        z = __ieee754_log10(x);
        if(_LIB_VERSION == _IEEE_ || isnan(x)) return z;
        if(x<=0.0) {
#ifndef HUGE_VAL 
#define HUGE_VAL inf
            double inf = 0.0;
 
            SET_HIGH_WORD(inf,0x7ff00000);      /* set inf to infinite */
#endif
            exc.name = "log10";
            exc.err = 0;
            exc.arg1 = x;
            exc.arg2 = x;
            if (_LIB_VERSION == _SVID_)
               exc.retval = -HUGE;
            else
               exc.retval = -HUGE_VAL;
            if(x==0.0) {
                /* log10(0) */
                exc.type = SING;
                if (_LIB_VERSION == _POSIX_)
                   errno = ERANGE;
                else if (!matherr(&exc)) {
                   errno = EDOM;
                }
            } else {
                /* log10(x<0) */
                exc.type = DOMAIN;
                if (_LIB_VERSION == _POSIX_)
                   errno = EDOM;
                else if (!matherr(&exc)) {
                   errno = EDOM;
                }
            }
            if (exc.err != 0)
               errno = exc.err;
            return exc.retval;
        } else
            return z;
#endif
}
 
#endif /* defined(_DOUBLE_IS_32BITS) */

Line No.	Rev	Author	Line
1	39	lampret
2			`/* @(#)w_log10.c 5.1 93/09/24 */`
3			`/*`
4			`* ====================================================`
5			`* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.`
6			`*`
7			`* Developed at SunPro, a Sun Microsystems, Inc. business.`
8			`* Permission to use, copy, modify, and distribute this`
9			`* software is freely granted, provided that this notice`
10			`* is preserved.`
11			`* ====================================================`
12			`*/`
13
14			`/*`
15			`FUNCTION`
16			`<<log10>>, <<log10f>>---base 10 logarithms`
17
18			`INDEX`
19			`log10`
20			`INDEX`
21			`log10f`
22
23			`ANSI_SYNOPSIS`
24			`#include <math.h>`
25			`double log10(double <[x]>);`
26			`float log10f(float <[x]>);`
27
28			`TRAD_SYNOPSIS`
29			`#include <math.h>`
30			`double log10(<[x]>)`
31			`double <[x]>;`
32
33			`float log10f(<[x]>)`
34			`float <[x]>;`
35
36			`DESCRIPTION`
37			`<<log10>> returns the base 10 logarithm of <[x]>.`
38			`It is implemented as <<log(<[x]>) / log(10)>>.`
39
40			`<<log10f>> is identical, save that it takes and returns <<float>> values.`
41
42			`RETURNS`
43			`<<log10>> and <<log10f>> return the calculated value.`
44
45			`See the description of <<log>> for information on errors.`
46
47			`PORTABILITY`
48			`<<log10>> is ANSI C. <<log10f>> is an extension.`
49
50			`*/`
51
52			`/*`
53			`* wrapper log10(X)`
54			`*/`
55
56			`#include "fdlibm.h"`
57			`#include <errno.h>`
58
59			`#ifndef _DOUBLE_IS_32BITS`
60
61			`#ifdef __STDC__`
62			`double log10(double x) /* wrapper log10 */`
63			`#else`
64			`double log10(x) /* wrapper log10 */`
65			`double x;`
66			`#endif`
67			`{`
68			`#ifdef _IEEE_LIBM`
69			`return __ieee754_log10(x);`
70			`#else`
71			`double z;`
72			`struct exception exc;`
73			`z = __ieee754_log10(x);`
74			`if(_LIB_VERSION == _IEEE_ \|\| isnan(x)) return z;`
75			`if(x<=0.0) {`
76			`#ifndef HUGE_VAL`
77			`#define HUGE_VAL inf`
78			`double inf = 0.0;`
79
80			`SET_HIGH_WORD(inf,0x7ff00000); /* set inf to infinite */`
81			`#endif`
82			`exc.name = "log10";`
83	56	joel	`exc.err = 0;`
84			`exc.arg1 = x;`
85			`exc.arg2 = x;`
86	39	lampret	`if (_LIB_VERSION == _SVID_)`
87			`exc.retval = -HUGE;`
88			`else`
89			`exc.retval = -HUGE_VAL;`
90			`if(x==0.0) {`
91			`/* log10(0) */`
92			`exc.type = SING;`
93			`if (_LIB_VERSION == _POSIX_)`
94			`errno = ERANGE;`
95			`else if (!matherr(&exc)) {`
96			`errno = EDOM;`
97			`}`
98			`} else {`
99			`/* log10(x<0) */`
100			`exc.type = DOMAIN;`
101			`if (_LIB_VERSION == _POSIX_)`
102			`errno = EDOM;`
103			`else if (!matherr(&exc)) {`
104			`errno = EDOM;`
105			`}`
106			`}`
107			`if (exc.err != 0)`
108			`errno = exc.err;`
109			`return exc.retval;`
110			`} else`
111			`return z;`
112			`#endif`
113			`}`
114
115			`#endif /* defined(_DOUBLE_IS_32BITS) */`

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