00001 /************************************************* 00002 * Perl-Compatible Regular Expressions * 00003 *************************************************/ 00004 00005 /* PCRE is a library of functions to support regular expressions whose syntax 00006 and semantics are as close as possible to those of the Perl 5 language. 00007 00008 Written by Philip Hazel 00009 Copyright (c) 1997-2008 University of Cambridge 00010 00011 ----------------------------------------------------------------------------- 00012 Redistribution and use in source and binary forms, with or without 00013 modification, are permitted provided that the following conditions are met: 00014 00015 * Redistributions of source code must retain the above copyright notice, 00016 this list of conditions and the following disclaimer. 00017 00018 * Redistributions in binary form must reproduce the above copyright 00019 notice, this list of conditions and the following disclaimer in the 00020 documentation and/or other materials provided with the distribution. 00021 00022 * Neither the name of the University of Cambridge nor the names of its 00023 contributors may be used to endorse or promote products derived from 00024 this software without specific prior written permission. 00025 00026 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 00027 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 00028 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 00029 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 00030 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 00031 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 00032 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 00033 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 00034 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 00035 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 00036 POSSIBILITY OF SUCH DAMAGE. 00037 ----------------------------------------------------------------------------- 00038 */ 00039 00040 00041 /* This module contains the external function pcre_refcount(), which is an 00042 auxiliary function that can be used to maintain a reference count in a compiled 00043 pattern data block. This might be helpful in applications where the block is 00044 shared by different users. */ 00045 00046 00047 #ifdef HAVE_CONFIG_H 00048 #include "config.h" 00049 #else if defined(_WINDOWS) 00050 #include <spl/configwin32.h> 00051 #endif 00052 00053 00054 #include "pcre_internal.h" 00055 00056 00057 /************************************************* 00058 * Maintain reference count * 00059 *************************************************/ 00060 00061 /* The reference count is a 16-bit field, initialized to zero. It is not 00062 possible to transfer a non-zero count from one host to a different host that 00063 has a different byte order - though I can't see why anyone in their right mind 00064 would ever want to do that! 00065 00066 Arguments: 00067 argument_re points to compiled code 00068 adjust value to add to the count 00069 00070 Returns: the (possibly updated) count value (a non-negative number), or 00071 a negative error number 00072 */ 00073 00074 PCRE_EXP_DEFN int PCRE_CALL_CONVENTION 00075 pcre_refcount(pcre *argument_re, int adjust) 00076 { 00077 real_pcre *re = (real_pcre *)argument_re; 00078 if (re == NULL) return PCRE_ERROR_NULL; 00079 re->ref_count = (-adjust > re->ref_count)? 0 : 00080 (adjust + re->ref_count > 65535)? 65535 : 00081 re->ref_count + adjust; 00082 return re->ref_count; 00083 } 00084 00085 /* End of pcre_refcount.c */