scirfmmon/source/miscfunc.c

//$Header: /home/dashley/cvsrep/e3ft_gpl01/e3ft_gpl01/winprojs/scirfmmon/source/miscfunc.c,v 1.4 2009/01/11 06:47:00 dashley Exp $
//--------------------------------------------------------------------------------
//Copyright 2008 David T. Ashley
//-------------------------------------------------------------------------------------------------
//This source code and any program in which it is compiled/used is provided under the GNU GENERAL
//PUBLIC LICENSE, Version 3, full license text below.
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//PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
//IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
//ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
//
//  16. Limitation of Liability.
//
//  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
//WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
//THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
//GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
//USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
//DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
//PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
//EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
//SUCH DAMAGES.
//
//  17. Interpretation of Sections 15 and 16.
//
//  If the disclaimer of warranty and limitation of liability provided
//above cannot be given local legal effect according to their terms,
//reviewing courts shall apply local law that most closely approximates
//an absolute waiver of all civil liability in connection with the
//Program, unless a warranty or assumption of liability accompanies a
//copy of the Program in return for a fee.
//
//                     END OF TERMS AND CONDITIONS
//
//            How to Apply These Terms to Your New Programs
//
//  If you develop a new program, and you want it to be of the greatest
//possible use to the public, the best way to achieve this is to make it
//free software which everyone can redistribute and change under these terms.
//
//  To do so, attach the following notices to the program.  It is safest
//to attach them to the start of each source file to most effectively
//state the exclusion of warranty; and each file should have at least
//the "copyright" line and a pointer to where the full notice is found.
//
//    <one line to give the program's name and a brief idea of what it does.>
//    Copyright (C) <year>  <name of author>
//
//    This program is free software: you can redistribute it and/or modify
//    it under the terms of the GNU General Public License as published by
//    the Free Software Foundation, either version 3 of the License, or
//    (at your option) any later version.
//
//    This program is distributed in the hope that it will be useful,
//    but WITHOUT ANY WARRANTY; without even the implied warranty of
//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//    GNU General Public License for more details.
//
//    You should have received a copy of the GNU General Public License
//    along with this program.  If not, see <http://www.gnu.org/licenses/>.
//
//Also add information on how to contact you by electronic and paper mail.
//
//  If the program does terminal interaction, make it output a short
//notice like this when it starts in an interactive mode:
//
//    <program>  Copyright (C) <year>  <name of author>
//    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
//    This is free software, and you are welcome to redistribute it
//    under certain conditions; type `show c' for details.
//
//The hypothetical commands `show w' and `show c' should show the appropriate
//parts of the General Public License.  Of course, your program's commands
//might be different; for a GUI interface, you would use an "about box".
//
//  You should also get your employer (if you work as a programmer) or school,
//if any, to sign a "copyright disclaimer" for the program, if necessary.
//For more information on this, and how to apply and follow the GNU GPL, see
//<http://www.gnu.org/licenses/>.
//
//  The GNU General Public License does not permit incorporating your program
//into proprietary programs.  If your program is a subroutine library, you
//may consider it more useful to permit linking proprietary applications with
//the library.  If this is what you want to do, use the GNU Lesser General
//Public License instead of this License.  But first, please read
//<http://www.gnu.org/philosophy/why-not-lgpl.html>.
//-------------------------------------------------------------------------------------------------
//--------------------------------------------------------------------------------
//This file is part of scirfmmon.
//
//scirfmmon is free software: you can redistribute it and/or modify
//it under the terms of the GNU General Public License as published by
//the Free Software Foundation, either version 3 of the License, or
//(at your option) any later version.
//
//scirfmmon is distributed in the hope that it will be useful,
//but WITHOUT ANY WARRANTY; without even the implied warranty of
//MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//GNU General Public License for more details.
//
//You should have received a copy of the GNU General Public License
//along with scirfmmon (see the file copying.txt).  If not, 
//see <http://www.gnu.org/licenses/>.
//--------------------------------------------------------------------------------
#define MODULE_MISCFUNC

#include <assert.h>
#include <limits.h>
#include <stddef.h>
#include <string.h>

#include "miscfunc.h"


int MISCFUNC_timb64_diff_bounded_ms(const struct __timeb64 *in_ref, const struct __timeb64 *in_eval_tgt)
   {
   long long int in_ref_t_int, in_eval_tgt_t_int;
   int in_ref_t_msec, in_eval_tgt_t_msec;

   //Extract the integer number of seconds.
   in_ref_t_int      = in_ref->time;
   in_eval_tgt_t_int = in_eval_tgt->time;

   //Extract the milliseconds.
   in_ref_t_msec      = in_ref->millitm;
   in_eval_tgt_t_msec = in_eval_tgt->millitm;

   //Branch out into three cases.  This simplifies my thinking about overflows and so on.  Note that
   //this function is bound tightly to Microsoft Visual C on a 32-bit platform.  This code is not
   //portable at all.
   //
   if (in_eval_tgt_t_int > in_ref_t_int)
      {
      //The time difference is positive.
      long long int diff_isecs;

      diff_isecs = in_eval_tgt_t_int - in_ref_t_int;

      if (diff_isecs > ((long long int)INT_MAX))
         {
         //The difference is too large by a factor of at least 1000.  Return
         //the max.
         return(INT_MAX);
         }

      //If we're here, the difference is bounded to be no more than a factor of 1000 larger.
      //Can do the calculations safely.
      diff_isecs *= 1000;     //Difference is now in milliseconds.
      if (in_eval_tgt_t_msec >= in_ref_t_msec)
         {
         //Simple subtraction.
         diff_isecs += (in_eval_tgt_t_msec - in_ref_t_msec);

         //We now have the number of milliseconds.
         if (diff_isecs > ((long long int)INT_MAX))
            return(INT_MAX);
         else
            return((int)diff_isecs);  //Cast to silence compiler warning.
         }
      else
         {
         //We have a rollover situation.  Since nothing is unsigned,
         //can just use the same expressions.
         //
         //Simple subtraction.  The expression will have a negative result, but this is OK.
         //Since everything is signed, everything should work.
         diff_isecs += (in_eval_tgt_t_msec - in_ref_t_msec);

         //We now have the number of milliseconds.
         if (diff_isecs > ((long long int)INT_MAX))
            return(INT_MAX);
         else
            return((int)diff_isecs);   //Cast to silence compiler warning.
         }
      }
   else if (in_eval_tgt_t_int < in_ref_t_int)
      {
      //The time difference is negative.
      long long int diff_isecs;

      diff_isecs = in_eval_tgt_t_int - in_ref_t_int;

      if (diff_isecs < ((long long int)INT_MIN))
         {
         //The difference is too large in magnitude by a factor of at least 1000.  Return
         //the max.
         return(INT_MIN);
         }

      //If we're here, the magnitude of the difference is bounded to be no more than a factor of 1000 larger.
      //Can do the calculations safely.
      diff_isecs *= 1000;     //Difference is now in milliseconds.
      if (in_eval_tgt_t_msec >= in_ref_t_msec)
         {
         //Simple subtraction.
         diff_isecs += (in_eval_tgt_t_msec - in_ref_t_msec);

         //We now have the number of milliseconds.
         if (diff_isecs < ((long long int)INT_MIN))
            return(INT_MIN);
         else
            return((int)diff_isecs);  //Cast to silence compiler warning.
         }
      else
         {
         //We have a rollover situation.  Since nothing is unsigned,
         //can just use the same expressions.
         //
         //Simple subtraction.  The expression will have a negative result, but this is OK.
         //Since everything is signed, everything should work.
         diff_isecs += (in_eval_tgt_t_msec - in_ref_t_msec);

         //We now have the number of milliseconds.
         if (diff_isecs < ((long long int)INT_MIN))
            return(INT_MIN);
         else
            return((int)diff_isecs);  //Cast to silence compiler warning.
         }
      }
   else
      {
      //The integer times are equal.  It boils down to milliseconds only.
      return(in_eval_tgt_t_msec - in_ref_t_msec);
      }
   }

 
//Compares the times of two timestamps to see if a<b, a==b, or a>b.  Return value of
//-1, 0, or 1 is the same convention as strcmp() and similar functions.
//
int MISCFUNC_timb64_t_cmp(const struct __timeb64 *in_a, const struct __timeb64 *in_b)
   {
   if (in_a->time < in_b->time)
      {
      return(-1);
      }
   else if (in_a->time > in_b->time)
      {
      return(1);
      }
   else
      {
      //Tie on integer seconds.  Use milliseconds.
      if (in_a->millitm < in_b->millitm)
         return(-1);
      else if (in_a->millitm > in_b->millitm)
         return(-1);
      else
         return(0);
      }
   }


const char *MISCFUNC_cvcinfo(void)
   {
   return("$Header: /home/dashley/cvsrep/e3ft_gpl01/e3ft_gpl01/winprojs/scirfmmon/source/miscfunc.c,v 1.4 2009/01/11 06:47:00 dashley Exp $");
   }


const char *MISCFUNC_hvcinfo(void)
   {
   return(MISCFUNC_H_VERSION);
   }


//**************************************************************************
// $Log: miscfunc.c,v $
// Revision 1.4  2009/01/11 06:47:00  dashley
// Edits.
//
// Revision 1.3  2009/01/11 06:11:31  dashley
// Edits.
//
// Revision 1.2  2009/01/11 04:10:46  dashley
// Edits.
//
// Revision 1.1  2009/01/11 02:58:56  dashley
// Initial checkin.
//**************************************************************************
// End of $RCSfile: miscfunc.c,v $.