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Annotation of embedaddon/pcre/pcre_refcount.c, revision 1.1.1.1

1.1       misho       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 */