/[pcre]/code/branches/pcre16/pcre_version.c
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Contents of /code/branches/pcre16/pcre_version.c

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Revision 785 - (hide annotations) (download)
Mon Dec 5 20:12:24 2011 UTC (3 years ago) by zherczeg
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File size: 4076 byte(s)
Improving UTF-16 support by fixing a lot of issues.
1 nigel 77 /*************************************************
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 ph10 305 Copyright (c) 1997-2008 University of Cambridge
10 nigel 77
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_version(), which returns a
42     string that identifies the PCRE version that is in use. */
43    
44    
45 ph10 200 #ifdef HAVE_CONFIG_H
46 ph10 236 #include "config.h"
47 ph10 200 #endif
48 ph10 199
49 nigel 77 #include "pcre_internal.h"
50    
51    
52     /*************************************************
53     * Return version string *
54     *************************************************/
55    
56 nigel 93 /* These macros are the standard way of turning unquoted text into C strings.
57     They allow macros like PCRE_MAJOR to be defined without quotes, which is
58     convenient for user programs that want to test its value. */
59    
60 nigel 77 #define STRING(a) # a
61     #define XSTRING(s) STRING(s)
62    
63 nigel 93 /* A problem turned up with PCRE_PRERELEASE, which is defined empty for
64     production releases. Originally, it was used naively in this code:
65    
66     return XSTRING(PCRE_MAJOR)
67     "." XSTRING(PCRE_MINOR)
68     XSTRING(PCRE_PRERELEASE)
69     " " XSTRING(PCRE_DATE);
70    
71     However, when PCRE_PRERELEASE is empty, this leads to an attempted expansion of
72     STRING(). The C standard states: "If (before argument substitution) any
73     argument consists of no preprocessing tokens, the behavior is undefined." It
74     turns out the gcc treats this case as a single empty string - which is what we
75     really want - but Visual C grumbles about the lack of an argument for the
76     macro. Unfortunately, both are within their rights. To cope with both ways of
77     handling this, I had resort to some messy hackery that does a test at run time.
78     I could find no way of detecting that a macro is defined as an empty string at
79     pre-processor time. This hack uses a standard trick for avoiding calling
80     the STRING macro with an empty argument when doing the test. */
81    
82 zherczeg 785 #ifdef COMPILE_PCRE8
83 ph10 359 PCRE_EXP_DEFN const char * PCRE_CALL_CONVENTION
84 nigel 77 pcre_version(void)
85 zherczeg 785 #else
86     PCRE_EXP_DEFN const char * PCRE_CALL_CONVENTION
87     pcre16_version(void)
88     #endif
89 nigel 77 {
90 nigel 93 return (XSTRING(Z PCRE_PRERELEASE)[1] == 0)?
91     XSTRING(PCRE_MAJOR.PCRE_MINOR PCRE_DATE) :
92     XSTRING(PCRE_MAJOR.PCRE_MINOR) XSTRING(PCRE_PRERELEASE PCRE_DATE);
93 nigel 77 }
94    
95     /* End of pcre_version.c */

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