text: /*************************************************
  *      Perl-Compatible Regular Expressions       *
  *************************************************/
  
  /* PCRE is a library of functions to support regular expressions whose syntax
  and semantics are as close as possible to those of the Perl 5 language.
  
                         Written by Philip Hazel
             Copyright (c) 1997-2005 University of Cambridge
  
  -----------------------------------------------------------------------------
  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions are met:
  
      * Redistributions of source code must retain the above copyright notice,
        this list of conditions and the following disclaimer.
  
      * Redistributions in binary form must reproduce the above copyright
        notice, this list of conditions and the following disclaimer in the
        documentation and/or other materials provided with the distribution.
  
      * Neither the name of the University of Cambridge nor the names of its
        contributors may be used to endorse or promote products derived from
        this software without specific prior written permission.
  
  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  POSSIBILITY OF SUCH DAMAGE.
  -----------------------------------------------------------------------------
  */
  
  
  /* This module contains the external function pcre_refcount(), which is an
  auxiliary function that can be used to maintain a reference count in a compiled
  pattern data block. This might be helpful in applications where the block is
  shared by different users. */
  
  #include "pcre_internal.h"
  
  
  /*************************************************
  *           Maintain reference count             *
  *************************************************/
  
  /* The reference count is a 16-bit field, initialized to zero. It is not
  possible to transfer a non-zero count from one host to a different host that
  has a different byte order - though I can't see why anyone in their right mind
  would ever want to do that!
  
  Arguments:
    argument_re   points to compiled code
    adjust        value to add to the count
  
  Returns:        the (possibly updated) count value (a non-negative number), or
                  a negative error number
  */
  
  EXPORT int
  pcre_refcount(pcre *argument_re, int adjust)
  {
  real_pcre *re = (real_pcre *)argument_re;
  if (re == NULL) return PCRE_ERROR_NULL;
  re->ref_count = (-adjust > re->ref_count)? 0 :
                  (adjust + re->ref_count > 65535)? 65535 :
                  re->ref_count + adjust;
  return re->ref_count;
  }
  
  /* End of pcre_refcount.c */
  