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