Tristan Matthews | 0461646 | 2013-11-14 16:09:34 -0500 | [diff] [blame] | 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) 1997-2008 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 | PCRE_EXP_DEFN int PCRE_CALL_CONVENTION |
| 72 | pcre_refcount(pcre *argument_re, int adjust) |
| 73 | { |
| 74 | real_pcre *re = (real_pcre *)argument_re; |
| 75 | if (re == NULL) return PCRE_ERROR_NULL; |
| 76 | re->ref_count = (-adjust > re->ref_count)? 0 : |
| 77 | (adjust + re->ref_count > 65535)? 65535 : |
| 78 | re->ref_count + adjust; |
| 79 | return re->ref_count; |
| 80 | } |
| 81 | |
| 82 | /* End of pcre_refcount.c */ |