Annotation of embedaddon/pcre/pcre_refcount.c, revision 1.1.1.2
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
1.1.1.2 ! misho 9: Copyright (c) 1997-2012 University of Cambridge
1.1 misho 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:
1.1.1.2 ! misho 71: #ifdef COMPILE_PCRE8
1.1 misho 72: PCRE_EXP_DEFN int PCRE_CALL_CONVENTION
73: pcre_refcount(pcre *argument_re, int adjust)
1.1.1.2 ! misho 74: #else
! 75: PCRE_EXP_DEFN int PCRE_CALL_CONVENTION
! 76: pcre16_refcount(pcre16 *argument_re, int adjust)
! 77: #endif
1.1 misho 78: {
1.1.1.2 ! misho 79: REAL_PCRE *re = (REAL_PCRE *)argument_re;
1.1 misho 80: if (re == NULL) return PCRE_ERROR_NULL;
1.1.1.2 ! misho 81: if (re->magic_number != MAGIC_NUMBER) return PCRE_ERROR_BADMAGIC;
! 82: if ((re->flags & PCRE_MODE) == 0) return PCRE_ERROR_BADMODE;
1.1 misho 83: re->ref_count = (-adjust > re->ref_count)? 0 :
84: (adjust + re->ref_count > 65535)? 65535 :
85: re->ref_count + adjust;
86: return re->ref_count;
87: }
88:
89: /* End of pcre_refcount.c */
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