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