mirror of
https://github.com/mongodb/mongo.git
synced 2024-11-30 17:10:48 +01:00
91 lines
3.9 KiB
C
91 lines
3.9 KiB
C
/*************************************************
|
|
* Perl-Compatible Regular Expressions *
|
|
*************************************************/
|
|
|
|
/* PCRE is a library of functions to support regular expressions whose syntax
|
|
and semantics are as close as possible to those of the Perl 5 language.
|
|
|
|
Written by Philip Hazel
|
|
Copyright (c) 1997-2007 University of Cambridge
|
|
|
|
-----------------------------------------------------------------------------
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, are permitted provided that the following conditions are met:
|
|
|
|
* Redistributions of source code must retain the above copyright notice,
|
|
this list of conditions and the following disclaimer.
|
|
|
|
* Redistributions in binary form must reproduce the above copyright
|
|
notice, this list of conditions and the following disclaimer in the
|
|
documentation and/or other materials provided with the distribution.
|
|
|
|
* Neither the name of the University of Cambridge nor the names of its
|
|
contributors may be used to endorse or promote products derived from
|
|
this software without specific prior written permission.
|
|
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
|
|
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
POSSIBILITY OF SUCH DAMAGE.
|
|
-----------------------------------------------------------------------------
|
|
*/
|
|
|
|
|
|
/* This module contains the external function pcre_version(), which returns a
|
|
string that identifies the PCRE version that is in use. */
|
|
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include "config.h"
|
|
#endif
|
|
|
|
#include "pcre_internal.h"
|
|
|
|
|
|
/*************************************************
|
|
* Return version string *
|
|
*************************************************/
|
|
|
|
/* These macros are the standard way of turning unquoted text into C strings.
|
|
They allow macros like PCRE_MAJOR to be defined without quotes, which is
|
|
convenient for user programs that want to test its value. */
|
|
|
|
#define STRING(a) # a
|
|
#define XSTRING(s) STRING(s)
|
|
|
|
/* A problem turned up with PCRE_PRERELEASE, which is defined empty for
|
|
production releases. Originally, it was used naively in this code:
|
|
|
|
return XSTRING(PCRE_MAJOR)
|
|
"." XSTRING(PCRE_MINOR)
|
|
XSTRING(PCRE_PRERELEASE)
|
|
" " XSTRING(PCRE_DATE);
|
|
|
|
However, when PCRE_PRERELEASE is empty, this leads to an attempted expansion of
|
|
STRING(). The C standard states: "If (before argument substitution) any
|
|
argument consists of no preprocessing tokens, the behavior is undefined." It
|
|
turns out the gcc treats this case as a single empty string - which is what we
|
|
really want - but Visual C grumbles about the lack of an argument for the
|
|
macro. Unfortunately, both are within their rights. To cope with both ways of
|
|
handling this, I had resort to some messy hackery that does a test at run time.
|
|
I could find no way of detecting that a macro is defined as an empty string at
|
|
pre-processor time. This hack uses a standard trick for avoiding calling
|
|
the STRING macro with an empty argument when doing the test. */
|
|
|
|
PCRE_EXP_DEFN const char *
|
|
pcre_version(void)
|
|
{
|
|
return (XSTRING(Z PCRE_PRERELEASE)[1] == 0)?
|
|
XSTRING(PCRE_MAJOR.PCRE_MINOR PCRE_DATE) :
|
|
XSTRING(PCRE_MAJOR.PCRE_MINOR) XSTRING(PCRE_PRERELEASE PCRE_DATE);
|
|
}
|
|
|
|
/* End of pcre_version.c */
|