Annotation of embedaddon/php/ext/pcre/pcrelib/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: #include "config.h"
! 48:
! 49: #include "pcre_internal.h"
! 50:
! 51:
! 52: /*************************************************
! 53: * Maintain reference count *
! 54: *************************************************/
! 55:
! 56: /* The reference count is a 16-bit field, initialized to zero. It is not
! 57: possible to transfer a non-zero count from one host to a different host that
! 58: has a different byte order - though I can't see why anyone in their right mind
! 59: would ever want to do that!
! 60:
! 61: Arguments:
! 62: argument_re points to compiled code
! 63: adjust value to add to the count
! 64:
! 65: Returns: the (possibly updated) count value (a non-negative number), or
! 66: a negative error number
! 67: */
! 68:
! 69: PCRE_EXP_DEFN int PCRE_CALL_CONVENTION
! 70: pcre_refcount(pcre *argument_re, int adjust)
! 71: {
! 72: real_pcre *re = (real_pcre *)argument_re;
! 73: if (re == NULL) return PCRE_ERROR_NULL;
! 74: re->ref_count = (-adjust > re->ref_count)? 0 :
! 75: (adjust + re->ref_count > 65535)? 65535 :
! 76: re->ref_count + adjust;
! 77: return re->ref_count;
! 78: }
! 79:
! 80: /* End of pcre_refcount.c */
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