/************************************************************************
 *                                                                      *
 *                              N O T I C E                             *
 *                                                                      *
 *                      Copyright Abandoned, 1987, Fred Fish            *
 *                                                                      *
 *      This previously copyrighted work has been placed into the       *
 *      public domain by the author (Fred Fish) and may be freely used  *
 *      for any purpose, private or commercial.  I would appreciate     *
 *      it, as a courtesy, if this notice is left in all copies and     *
 *      derivative works.  Thank you, and enjoy...                      *
 *                                                                      *
 *      The author makes no warranty of any kind with respect to this   *
 *      product and explicitly disclaims any implied warranties of      *
 *      merchantability or fitness for any particular purpose.          *
 *                                                                      *
 ************************************************************************
 */

/*
 *  FUNCTION
 *
 *      log10   double precision common log
 *
 *  KEY WORDS
 *
 *      log10
 *      machine independent routines
 *      math libraries
 *
 *  DESCRIPTION
 *
 *      Returns double precision common log of double precision
 *      floating point argument.
 *
 *  USAGE
 *
 *      double log10 (x)
 *      double x;
 *
 *  REFERENCES
 *
 *      PDP-11 Fortran IV-plus users guide, Digital Equip. Corp.,
 *      1975, pp. B-3.
 *
 *  RESTRICTIONS
 *
 *      For precision information refer to documentation of the
 *      floating point library routines called.
 *      
 *  PROGRAMMER
 *
 *      Fred Fish
 *
 *  INTERNALS
 *
 *      Computes log10(x) from:
 *
 *              log10(x) = log10(e) * log(x)
 *
 */

#include <stdio.h>
#include "pml.h"

static char funcname[] = "log10";

double log10 (x)
double x;
{
    extern double log ();

    DBUG_ENTER (funcname);
    DBUG_3 ("log10in", "arg %le", x);
    x = LOG10E * log (x);
    DBUG_3 ("log10out", "result %le", x);
    DBUG_RETURN (x);
}