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Member "pcre-8.43/pcre_refcount.c" (31 Jan 2014, 3778 Bytes) of package /linux/misc/pcre-8.43.tar.bz2:


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    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 */