1 /* wrf_lgamma.c -- float version of wr_lgamma.c.
2  * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
3  */
4 
5 /*
6  * ====================================================
7  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
8  *
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  * ====================================================
14  */
15 
16 /*
17  * wrapper float lgammaf_r(float x, int *signgamp)
18  */
19 
20 #include "fdlibm.h"
21 #include <errno.h>
22 
23 #ifdef __STDC__
lgammaf_r(float x,int * signgamp)24 	float lgammaf_r(float x, int *signgamp) /* wrapper lgammaf_r */
25 #else
26 	float lgammaf_r(x,signgamp)              /* wrapper lgammaf_r */
27 	float x; int *signgamp;
28 #endif
29 {
30 #ifdef _IEEE_LIBM
31 	return __ieee754_lgammaf_r(x,signgamp);
32 #else
33         float y;
34 	struct exception exc;
35         y = __ieee754_lgammaf_r(x,signgamp);
36         if(_LIB_VERSION == _IEEE_) return y;
37         if(!finitef(y)&&finitef(x)) {
38 #ifndef HUGE_VAL
39 #define HUGE_VAL inf
40 	    double inf = 0.0;
41 
42 	    SET_HIGH_WORD(inf,0x7ff00000);	/* set inf to infinite */
43 #endif
44 	    exc.name = "lgammaf";
45 	    exc.err = 0;
46 	    exc.arg1 = exc.arg2 = (double)x;
47             if (_LIB_VERSION == _SVID_)
48                exc.retval = HUGE;
49             else
50                exc.retval = HUGE_VAL;
51 	    if(floorf(x)==x&&x<=(float)0.0) {
52 		/* lgammaf(-integer) or lgamma(0) */
53 		exc.type = SING;
54 		if (_LIB_VERSION == _POSIX_)
55 		   errno = EDOM;
56 		else if (!matherr(&exc)) {
57 		   errno = EDOM;
58 		}
59 
60             } else {
61 		/* lgammaf(finite) overflow */
62 		exc.type = OVERFLOW;
63                 if (_LIB_VERSION == _POSIX_)
64 		   errno = ERANGE;
65                 else if (!matherr(&exc)) {
66                    errno = ERANGE;
67 		}
68             }
69 	    if (exc.err != 0)
70 	       errno = exc.err;
71             return (float)exc.retval;
72         } else
73             return y;
74 #endif
75 }
76