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