1/************************************************* 2* Perl-Compatible Regular Expressions * 3*************************************************/ 4 5/* PCRE is a library of functions to support regular expressions whose syntax 6and semantics are as close as possible to those of the Perl 5 language. 7 8 Written by Philip Hazel 9 Copyright (c) 1997-2008 University of Cambridge 10 11----------------------------------------------------------------------------- 12Redistribution and use in source and binary forms, with or without 13modification, are permitted provided that the following conditions are met: 14 15 * Redistributions of source code must retain the above copyright notice, 16 this list of conditions and the following disclaimer. 17 18 * Redistributions in binary form must reproduce the above copyright 19 notice, this list of conditions and the following disclaimer in the 20 documentation and/or other materials provided with the distribution. 21 22 * Neither the name of the University of Cambridge nor the names of its 23 contributors may be used to endorse or promote products derived from 24 this software without specific prior written permission. 25 26THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 27AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 30LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36POSSIBILITY OF SUCH DAMAGE. 37----------------------------------------------------------------------------- 38*/ 39 40 41/* This module contains the external function pcre_refcount(), which is an 42auxiliary function that can be used to maintain a reference count in a compiled 43pattern data block. This might be helpful in applications where the block is 44shared by different users. */ 45 46 47#ifdef HAVE_CONFIG_H 48#include "config.h" 49#endif 50 51#include "pcre_internal.h" 52 53 54/************************************************* 55* Maintain reference count * 56*************************************************/ 57 58/* The reference count is a 16-bit field, initialized to zero. It is not 59possible to transfer a non-zero count from one host to a different host that 60has a different byte order - though I can't see why anyone in their right mind 61would ever want to do that! 62 63Arguments: 64 argument_re points to compiled code 65 adjust value to add to the count 66 67Returns: the (possibly updated) count value (a non-negative number), or 68 a negative error number 69*/ 70 71PCRE_EXP_DEFN int PCRE_CALL_CONVENTION 72pcre_refcount(pcre *argument_re, int adjust) 73{ 74real_pcre *re = (real_pcre *)argument_re; 75if (re == NULL) return PCRE_ERROR_NULL; 76re->ref_count = (-adjust > re->ref_count)? 0 : 77 (adjust + re->ref_count > 65535)? 65535 : 78 re->ref_count + adjust; 79return re->ref_count; 80} 81 82/* End of pcre_refcount.c */ 83