/*************************************************

*      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

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    * Redistributions of source code must retain the above copyright notice,

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      notice, this list of conditions and the following disclaimer in the

      documentation and/or other materials provided with the distribution.

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*/

/* 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

*/

PCRE_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 */