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Annotation of 43BSD/usr.lib/liboldnm/acos.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1980 Regents of the University of California.
        !             3:  * All rights reserved.  The Berkeley software License Agreement
        !             4:  * specifies the terms and conditions for redistribution.
        !             5:  */
        !             6: 
        !             7: #ifndef lint
        !             8: static char sccsid[] = "@(#)acos.c     5.1 (Berkeley) 5/8/85";
        !             9: #endif not lint
        !            10: 
        !            11: /*
        !            12: acos(arg) return the arccos,
        !            13:        respectively of their arguments.
        !            14: 
        !            15:        Arctan is called after appropriate range reduction.
        !            16: */
        !            17: 
        !            18: #include       <errno.h>
        !            19: int errno;
        !            20: double atan();
        !            21: double asin();
        !            22: static double pio2     = 1.570796326794896619;
        !            23: 
        !            24: double
        !            25: acos(arg) double arg; {
        !            26: 
        !            27:        asm("   bispsw  $0xe0");
        !            28:        if(arg > 1.|| arg < -1.){
        !            29:                errno = EDOM;
        !            30:                return(0.);
        !            31:        }
        !            32: 
        !            33:        return(pio2 - asin(arg));
        !            34: }

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