Source

daybodep / checksum.c

/*
    Daybo Logic Dependency tool
    Copyright (C) 2001-2003  David Duncan Ross Palmer, Daybo Logic.

    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 2 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, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA


  Daybo Logic,
  57 Alderwood Parc,
  Penryn,
  Kernow,
  United Kingdom.

  TR10 8RL
*/

#include <assert.h>
#include <stddef.h>
#include <string.h>
#include <stdio.h>
#ifdef HDRSTOP
# pragma hdrstop
#endif /*HDRSTOP*/

#include "daybodep.h"
/*-------------------------------------------------------------------------*/
enum checksumDiff ChecksumCompare(
  const CHECKSUM *PChecksumLeft,
  const CHECKSUM *PChecksumRight
)
{
  assert(PChecksumLeft && PChecksumRight);
  if ( (*PChecksumRight) < (*PChecksumLeft) ) return chkdLesser;
  if ( (*PChecksumRight) > (*PChecksumLeft) ) return chkdGreater;
  return chkdEqual;
}
/*-------------------------------------------------------------------------*/
void ChecksumAssign(
  CHECKSUM *PChecksumTarget,
  const CHECKSUM *PChecksumSource
)
{
  assert(PChecksumTarget);
  /* Using a zero sum if given NULL */
  *PChecksumTarget = (PChecksumSource) ? (*PChecksumSource) : (0U);
  return;
}
/*-------------------------------------------------------------------------*/
CHECKSUM ChecksumCalculate(
  const char *PCString
)
{
  size_t i;
  CHECKSUM sum = 0U;

  if ( PCString ) {
    size_t len = strlen(PCString);
    for ( i = 0U; i < len; i++ )
      sum += PCString[i];
  }
  return sum;
}
/*-------------------------------------------------------------------------*/