1 /************************************************* 2 * Perl-Compatible Regular Expressions * 3 *************************************************/ 4 5 /* PCRE is a library of functions to support regular expressions whose syntax 6 and semantics are as close as possible to those of the Perl 5 language. 7 8 Written by Philip Hazel 9 Copyright (c) 1997-2012 University of Cambridge 10 11 ----------------------------------------------------------------------------- 12 Redistribution and use in source and binary forms, with or without 13 modification, 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 26 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 27 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 30 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 POSSIBILITY OF SUCH DAMAGE. 37 ----------------------------------------------------------------------------- 38 */ 39 40 41 /* This module contains the external function pcre_refcount(), which is an 42 auxiliary function that can be used to maintain a reference count in a compiled 43 pattern data block. This might be helpful in applications where the block is 44 shared 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 59 possible to transfer a non-zero count from one host to a different host that 60 has a different byte order - though I can't see why anyone in their right mind 61 would ever want to do that! 62 63 Arguments: 64 argument_re points to compiled code 65 adjust value to add to the count 66 67 Returns: the (possibly updated) count value (a non-negative number), or 68 a negative error number 69 */ 70 71 #if defined COMPILE_PCRE8 72 PCRE_EXP_DEFN int PCRE_CALL_CONVENTION 73 pcre_refcount(pcre *argument_re, int adjust) 74 #elif defined COMPILE_PCRE16 75 PCRE_EXP_DEFN int PCRE_CALL_CONVENTION 76 pcre16_refcount(pcre16 *argument_re, int adjust) 77 #elif defined COMPILE_PCRE32 78 PCRE_EXP_DEFN int PCRE_CALL_CONVENTION 79 pcre32_refcount(pcre32 *argument_re, int adjust) 80 #endif 81 { 82 REAL_PCRE *re = (REAL_PCRE *)argument_re; 83 if (re == NULL) return PCRE_ERROR_NULL; 84 if (re->magic_number != MAGIC_NUMBER) return PCRE_ERROR_BADMAGIC; 85 if ((re->flags & PCRE_MODE) == 0) return PCRE_ERROR_BADMODE; 86 re->ref_count = (-adjust > re->ref_count)? 0 : 87 (adjust + re->ref_count > 65535)? 65535 : 88 re->ref_count + adjust; 89 return re->ref_count; 90 } 91 92 /* End of pcre_refcount.c */ 93
