93 lines
3.7 KiB
C
93 lines
3.7 KiB
C
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/*************************************************
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* Perl-Compatible Regular Expressions *
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*************************************************/
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/* PCRE is a library of functions to support regular expressions whose syntax
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and semantics are as close as possible to those of the Perl 5 language.
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Written by Philip Hazel
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Copyright (c) 1997-2012 University of Cambridge
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-----------------------------------------------------------------------------
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the name of the University of Cambridge nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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-----------------------------------------------------------------------------
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*/
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/* This module contains the external function pcre_refcount(), which is an
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auxiliary function that can be used to maintain a reference count in a compiled
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pattern data block. This might be helpful in applications where the block is
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shared by different users. */
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "pcre_internal.h"
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/*************************************************
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* Maintain reference count *
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*************************************************/
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/* The reference count is a 16-bit field, initialized to zero. It is not
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possible to transfer a non-zero count from one host to a different host that
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has a different byte order - though I can't see why anyone in their right mind
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would ever want to do that!
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Arguments:
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argument_re points to compiled code
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adjust value to add to the count
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Returns: the (possibly updated) count value (a non-negative number), or
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a negative error number
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*/
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#if defined COMPILE_PCRE8
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PCRE_EXP_DEFN int PCRE_CALL_CONVENTION
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pcre_refcount(pcre *argument_re, int adjust)
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#elif defined COMPILE_PCRE16
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PCRE_EXP_DEFN int PCRE_CALL_CONVENTION
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pcre16_refcount(pcre16 *argument_re, int adjust)
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#elif defined COMPILE_PCRE32
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PCRE_EXP_DEFN int PCRE_CALL_CONVENTION
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pcre32_refcount(pcre32 *argument_re, int adjust)
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#endif
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{
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REAL_PCRE *re = (REAL_PCRE *)argument_re;
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if (re == NULL) return PCRE_ERROR_NULL;
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if (re->magic_number != MAGIC_NUMBER) return PCRE_ERROR_BADMAGIC;
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if ((re->flags & PCRE_MODE) == 0) return PCRE_ERROR_BADMODE;
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re->ref_count = (-adjust > re->ref_count)? 0 :
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(adjust + re->ref_count > 65535)? 65535 :
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re->ref_count + adjust;
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return re->ref_count;
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}
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/* End of pcre_refcount.c */
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