91 lines
3.9 KiB
C
91 lines
3.9 KiB
C
/*************************************************
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* Perl-Compatible Regular Expressions *
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*************************************************/
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/* PCRE is a library of functions to support regular expressions whose syntax
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and semantics are as close as possible to those of the Perl 5 language.
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Written by Philip Hazel
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Copyright (c) 1997-2008 University of Cambridge
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-----------------------------------------------------------------------------
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the name of the University of Cambridge nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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-----------------------------------------------------------------------------
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*/
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/* This module contains the external function pcre_version(), which returns a
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string that identifies the PCRE version that is in use. */
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "pcre_internal.h"
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/*************************************************
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* Return version string *
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*************************************************/
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/* These macros are the standard way of turning unquoted text into C strings.
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They allow macros like PCRE_MAJOR to be defined without quotes, which is
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convenient for user programs that want to test its value. */
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#define STRING(a) # a
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#define XSTRING(s) STRING(s)
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/* A problem turned up with PCRE_PRERELEASE, which is defined empty for
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production releases. Originally, it was used naively in this code:
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return XSTRING(PCRE_MAJOR)
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"." XSTRING(PCRE_MINOR)
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XSTRING(PCRE_PRERELEASE)
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" " XSTRING(PCRE_DATE);
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However, when PCRE_PRERELEASE is empty, this leads to an attempted expansion of
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STRING(). The C standard states: "If (before argument substitution) any
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argument consists of no preprocessing tokens, the behavior is undefined." It
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turns out the gcc treats this case as a single empty string - which is what we
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really want - but Visual C grumbles about the lack of an argument for the
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macro. Unfortunately, both are within their rights. To cope with both ways of
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handling this, I had resort to some messy hackery that does a test at run time.
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I could find no way of detecting that a macro is defined as an empty string at
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pre-processor time. This hack uses a standard trick for avoiding calling
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the STRING macro with an empty argument when doing the test. */
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PCRE_EXP_DEFN const char * PCRE_CALL_CONVENTION
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pcre_version(void)
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{
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return (XSTRING(Z PCRE_PRERELEASE)[1] == 0)?
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XSTRING(PCRE_MAJOR.PCRE_MINOR PCRE_DATE) :
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XSTRING(PCRE_MAJOR.PCRE_MINOR) XSTRING(PCRE_PRERELEASE PCRE_DATE);
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}
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/* End of pcre_version.c */
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