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Annotation of embedaddon/pcre/pcre_version.c, revision 1.1.1.3

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_version(), which returns a
                     42: string that identifies the PCRE version that is in use. */
                     43: 
                     44: 
                     45: #ifdef HAVE_CONFIG_H
                     46: #include "config.h"
                     47: #endif
                     48: 
                     49: #include "pcre_internal.h"
                     50: 
                     51: 
                     52: /*************************************************
                     53: *          Return version string                 *
                     54: *************************************************/
                     55: 
                     56: /* 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: #define STRING(a)  # a
                     61: #define XSTRING(s) STRING(s)
                     62: 
                     63: /* 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: 
1.1.1.3 ! misho      82: #if defined COMPILE_PCRE8
1.1       misho      83: PCRE_EXP_DEFN const char * PCRE_CALL_CONVENTION
                     84: pcre_version(void)
1.1.1.3 ! misho      85: #elif defined COMPILE_PCRE16
1.1.1.2   misho      86: PCRE_EXP_DEFN const char * PCRE_CALL_CONVENTION
                     87: pcre16_version(void)
1.1.1.3 ! misho      88: #elif defined COMPILE_PCRE32
        !            89: PCRE_EXP_DEFN const char * PCRE_CALL_CONVENTION
        !            90: pcre32_version(void)
1.1.1.2   misho      91: #endif
1.1       misho      92: {
                     93: return (XSTRING(Z PCRE_PRERELEASE)[1] == 0)?
                     94:   XSTRING(PCRE_MAJOR.PCRE_MINOR PCRE_DATE) :
                     95:   XSTRING(PCRE_MAJOR.PCRE_MINOR) XSTRING(PCRE_PRERELEASE PCRE_DATE);
                     96: }
                     97: 
                     98: /* End of pcre_version.c */