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

*      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) 1997-2008 University of Cambridge

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

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    * 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.

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      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

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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE

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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. */

#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

#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_EXP_DEFN int PCRE_CALL_CONVENTION

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 */