File: ffs.c

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cvc4 1.8-2
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/*********************                                                        */
/*! \file ffs.c
 ** \verbatim
 ** Top contributors (to current version):
 **   Morgan Deters, Andres Noetzli
 ** This file is part of the CVC4 project.
 ** Copyright (c) 2009-2020 by the authors listed in the file AUTHORS
 ** in the top-level source directory) and their institutional affiliations.
 ** All rights reserved.  See the file COPYING in the top-level source
 ** directory for licensing information.\endverbatim
 **
 ** \brief Replacement for ffs() for systems without it (like Win32)
 **
 ** Replacement for ffs() for systems without it (like Win32).
 **/

#include "cvc4_private.h"

#include "lib/ffs.h"

#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
#ifndef HAVE_FFS

int ffs(int i) {
  long mask = 0x1;
  int pos = 1;
  while(pos <= sizeof(int) * 8) {
    if((mask & i) != 0) {
      return pos;
    }
    ++pos;
    mask <<= 1;
  }
  return 0;
}

#endif /* ifndef HAVE_FFS */
#ifdef __cplusplus
}/* extern "C" */
#endif /* __cplusplus */