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  1. /* Copyright (C) 1994 DJ Delorie, see COPYING.DJ for details */
  2. /* w_logf.c -- float version of w_log.c.
  3.  * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
  4.  */
  5.  
  6. /*
  7.  * ====================================================
  8.  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
  9.  *
  10.  * Developed at SunPro, a Sun Microsystems, Inc. business.
  11.  * Permission to use, copy, modify, and distribute this
  12.  * software is freely granted, provided that this notice
  13.  * is preserved.
  14.  * ====================================================
  15.  */
  16.  
  17. #if defined(LIBM_SCCS) && !defined(lint)
  18. static char rcsid[] = "$Id: w_logf.c,v 1.1 1994/08/10 20:35:23 jtc Exp $";
  19. #endif
  20.  
  21. /*
  22.  * wrapper logf(x)
  23.  */
  24.  
  25. #include "math.h"
  26. #include "math_private.h"
  27.  
  28.  
  29. #ifdef __STDC__
  30.         float logf(float x)             /* wrapper logf */
  31. #else
  32.         float logf(x)                   /* wrapper logf */
  33.         float x;
  34. #endif
  35. {
  36. #ifdef _IEEE_LIBM
  37.         return __ieee754_logf(x);
  38. #else
  39.         float z;
  40.         z = __ieee754_logf(x);
  41.         if(_LIB_VERSION == _IEEE_ || isnanf(x) || x > (float)0.0) return z;
  42.         if(x==(float)0.0)
  43.             /* logf(0) */
  44.             return (float)__kernel_standard((double)x,(double)x,116);
  45.         else
  46.             /* logf(x<0) */
  47.             return (float)__kernel_standard((double)x,(double)x,117);
  48. #endif
  49. }
  50.