NCBI C++ Toolkit Cross Reference

C++/src/util/regexp/pcre_refcount.c

  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 */
 83
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