libjava/java/lang/w_remainder.c

   1
   2 /* @(#)w_remainder.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 <<rint>>, <<rintf>>, <<remainder>>, <<remainderf>>---round and  remainder
  17 INDEX
  18         rint
  19 INDEX
  20         rintf
  21 INDEX
  22         remainder
  23 INDEX
  24         remainderf
  25
  26 ANSI_SYNOPSIS
  27         #include <math.h>
  28         double rint(double <[x]>);
  29         float rintf(float <[x]>);
  30         double remainder(double <[x]>, double <[y]>);
  31         float remainderf(float <[x]>, float <[y]>);
  32
  33 TRAD_SYNOPSIS
  34         #include <math.h>
  35         double rint(<[x]>)
  36         double <[x]>;
  37         float rintf(<[x]>)
  38         float <[x]>;
  39         double remainder(<[x]>,<[y]>)
  40         double <[x]>, <[y]>;
  41         float remainderf(<[x]>,<[y]>)
  42         float <[x]>, <[y]>;
  43
  44 DESCRIPTION
  45 <<rint>> and <<rintf>> returns their argument rounded to the nearest
  46 integer.  <<remainder>> and <<remainderf>> find the remainder of
  47 <[x]>/<[y]>; this value is in the range -<[y]>/2 .. +<[y]>/2.
  48
  49 RETURNS
  50 <<rint>> and <<remainder>> return the integer result as a double.
  51
  52 PORTABILITY
  53 <<rint>> and <<remainder>> are System V release 4.  <<rintf>> and
  54 <<remainderf>> are extensions.
  55
  56 */
  57
  58 /*
  59  * wrapper remainder(x,p)
  60  */
  61
  62 #include "fdlibm.h"
  63 #include <errno.h>
  64
  65 #ifndef _DOUBLE_IS_32BITS
  66
  67 #ifdef __STDC__
  68         double remainder(double x, double y)    /* wrapper remainder */
  69 #else
  70         double remainder(x,y)                   /* wrapper remainder */
  71         double x,y;
  72 #endif
  73 {
  74 #ifdef _IEEE_LIBM
  75         return __ieee754_remainder(x,y);
  76 #else
  77         double z;
  78         struct exception exc;
  79         z = __ieee754_remainder(x,y);
  80         if(_LIB_VERSION == _IEEE_ || isnan(y)) return z;
  81         if(y==0.0) {
  82             /* remainder(x,0) */
  83             exc.type = DOMAIN;
  84             exc.name = "remainder";
  85             exc.err = 0;
  86             exc.arg1 = x;
  87             exc.arg2 = y;
  88             exc.retval = 0.0/0.0;
  89             if (_LIB_VERSION == _POSIX_)
  90                errno = EDOM;
  91             else if (!matherr(&exc)) {
  92                errno = EDOM;
  93             }
  94             if (exc.err != 0)
  95                errno = exc.err;
  96             return exc.retval;
  97         } else
  98             return z;
  99 #endif
 100 }
 101
 102 #endif /* defined(_DOUBLE_IS_32BITS) */
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