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-
- package Devel::PPPort;
-
- =head1 NAME
-
- Perl/Pollution/Portability
-
- =head1 SYNOPSIS
-
- Devel::PPPort::WriteFile() ; # defaults to ./ppport.h
- Devel::PPPort::WriteFile('someheader.h') ;
-
- =head1 DESCRIPTION
-
- Perl has changed over time, gaining new features, new functions,
- increasing its flexibility, and reducing the impact on the C namespace
- environment (reduced pollution). The header file, typicaly C<ppport.h>,
- written by this module attempts to bring some of the newer Perl
- features to older versions of Perl, so that you can worry less about
- keeping track of old releases, but users can still reap the benefit.
-
- Why you should use C<ppport.h> in modern code: so that your code will work
- with the widest range of Perl interpreters possible, without significant
- additional work.
-
- Why you should attempt older code to fully use C<ppport.h>: because
- the reduced pollution of newer Perl versions is an important thing, so
- important that the old polluting ways of original Perl modules will not be
- supported very far into the future, and your module will almost certainly
- break! By adapting to it now, you'll gained compatibility and a sense of
- having done the electronic ecology some good.
-
- How to use ppport.h: Don't direct the user to download C<Devel::PPPort>,
- and don't make C<ppport.h> optional. Rather, just take the most recent
- copy of C<ppport.h> that you can find (probably in C<Devel::PPPort>
- on CPAN), copy it into your project, adjust your project to use it,
- and distribute the header along with your module.
-
- C<Devel::PPPort> contains a single function, called C<WriteFile>. It's
- purpose is to write a 'C' header file that is used when writing XS
- modules. The file contains a series of macros that allow XS modules to
- be built using older versions of Perl.
-
- This module is used by h2xs to write the file F<ppport.h>.
-
- =head2 WriteFile
-
- C<WriteFile> takes a zero or one parameters. When called with one
- parameter it expects to be passed a filename. When called with no
- parameters, it defults to the filename C<./pport.h>.
-
- The function returns TRUE if the file was written successfully. Otherwise
- it returns FALSE.
-
- =head1 ppport.h
-
- The file written by this module, typically C<ppport.h>, provides access
- to the following Perl API if not already available (and in some cases [*]
- even if available, access to a fixed interface):
-
- aMY_CXT
- aMY_CXT_
- _aMY_CXT
- aTHX
- aTHX_
- AvFILLp
- boolSV(b)
- DEFSV
- dMY_CXT
- dMY_CXT_SV
- dNOOP
- dTHR
- dTHX
- dTHXa
- dTHXoa
- ERRSV
- gv_stashpvn(str,len,flags)
- INT2PTR(type,int)
- IVdf
- MY_CXT
- MY_CXT_INIT
- newCONSTSUB(stash,name,sv)
- newRV_inc(sv)
- newRV_noinc(sv)
- newSVpvn(data,len)
- NOOP
- NV
- NVef
- NVff
- NVgf
- PERL_REVISION
- PERL_SUBVERSION
- PERL_UNUSED_DECL
- PERL_UNUSED_DECL
- PERL_VERSION
- PL_compiling
- PL_copline
- PL_curcop
- PL_curstash
- PL_defgv
- PL_dirty
- PL_hints
- PL_na
- PL_perldb
- PL_rsfp_filters
- PL_rsfpv
- PL_stdingv
- PL_Sv
- PL_sv_no
- PL_sv_undef
- PL_sv_yes
- pMY_CXT
- pMY_CXT_
- _pMY_CXT
- pTHX
- pTHX_
- PTR2IV(ptr)
- PTR2NV(ptr)
- PTR2ul(ptr)
- PTR2UV(ptr)
- SAVE_DEFSV
- START_MY_CXT
- SvPVbyte(sv,lp) [*]
- UVof
- UVSIZE
- UVuf
- UVxf
- UVXf
-
- =head1 AUTHOR
-
- Version 1.x of Devel::PPPort was written by Kenneth Albanowski.
-
- Version 2.x was ported to the Perl core by Paul Marquess.
-
- =head1 SEE ALSO
-
- See L<h2xs>.
-
- =cut
-
-
- package Devel::PPPort;
-
- require Exporter;
- require DynaLoader;
- #use warnings;
- use strict;
- use vars qw( $VERSION @ISA @EXPORT @EXPORT_OK $data );
-
- $VERSION = "2.0002";
-
- @ISA = qw(Exporter DynaLoader);
- @EXPORT = qw();
- # Other items we are prepared to export if requested
- @EXPORT_OK = qw( );
-
- bootstrap Devel::PPPort;
-
- package Devel::PPPort;
-
- {
- local $/ = undef;
- $data = <DATA> ;
- my $now = localtime;
- my $pkg = __PACKAGE__;
- $data =~ s/__VERSION__/$VERSION/g;
- $data =~ s/__DATE__/$now/g;
- $data =~ s/__PKG__/$pkg/g;
- }
-
- sub WriteFile
- {
- my $file = shift || 'ppport.h' ;
-
- open F, ">$file" || return undef ;
- print F $data ;
- close F;
-
- return 1 ;
- }
-
- 1;
-
- __DATA__;
-
- /* ppport.h -- Perl/Pollution/Portability Version __VERSION__
- *
- * Automatically Created by __PKG__ on __DATE__
- *
- * Do NOT edit this file directly! -- Edit PPPort.pm instead.
- *
- * Version 2.x, Copyright (C) 2001, Paul Marquess.
- * Version 1.x, Copyright (C) 1999, Kenneth Albanowski.
- * This code may be used and distributed under the same license as any
- * version of Perl.
- *
- * This version of ppport.h is designed to support operation with Perl
- * installations back to 5.004, and has been tested up to 5.8.0.
- *
- * If this version of ppport.h is failing during the compilation of this
- * module, please check if a newer version of Devel::PPPort is available
- * on CPAN before sending a bug report.
- *
- * If you are using the latest version of Devel::PPPort and it is failing
- * during compilation of this module, please send a report to perlbug@perl.com
- *
- * Include all following information:
- *
- * 1. The complete output from running "perl -V"
- *
- * 2. This file.
- *
- * 3. The name & version of the module you were trying to build.
- *
- * 4. A full log of the build that failed.
- *
- * 5. Any other information that you think could be relevant.
- *
- *
- * For the latest version of this code, please retreive the Devel::PPPort
- * module from CPAN.
- *
- */
-
- /*
- * In order for a Perl extension module to be as portable as possible
- * across differing versions of Perl itself, certain steps need to be taken.
- * Including this header is the first major one, then using dTHR is all the
- * appropriate places and using a PL_ prefix to refer to global Perl
- * variables is the second.
- *
- */
-
-
- /* If you use one of a few functions that were not present in earlier
- * versions of Perl, please add a define before the inclusion of ppport.h
- * for a static include, or use the GLOBAL request in a single module to
- * produce a global definition that can be referenced from the other
- * modules.
- *
- * Function: Static define: Extern define:
- * newCONSTSUB() NEED_newCONSTSUB NEED_newCONSTSUB_GLOBAL
- *
- */
-
-
- /* To verify whether ppport.h is needed for your module, and whether any
- * special defines should be used, ppport.h can be run through Perl to check
- * your source code. Simply say:
- *
- * perl -x ppport.h *.c *.h *.xs foo/bar*.c [etc]
- *
- * The result will be a list of patches suggesting changes that should at
- * least be acceptable, if not necessarily the most efficient solution, or a
- * fix for all possible problems. It won't catch where dTHR is needed, and
- * doesn't attempt to account for global macro or function definitions,
- * nested includes, typemaps, etc.
- *
- * In order to test for the need of dTHR, please try your module under a
- * recent version of Perl that has threading compiled-in.
- *
- */
-
-
- /*
- #!/usr/bin/perl
- @ARGV = ("*.xs") if !@ARGV;
- %badmacros = %funcs = %macros = (); $replace = 0;
- foreach (<DATA>) {
- $funcs{$1} = 1 if /Provide:\s+(\S+)/;
- $macros{$1} = 1 if /^#\s*define\s+([a-zA-Z0-9_]+)/;
- $replace = $1 if /Replace:\s+(\d+)/;
- $badmacros{$2}=$1 if $replace and /^#\s*define\s+([a-zA-Z0-9_]+).*?\s+([a-zA-Z0-9_]+)/;
- $badmacros{$1}=$2 if /Replace (\S+) with (\S+)/;
- }
- foreach $filename (map(glob($_),@ARGV)) {
- unless (open(IN, "<$filename")) {
- warn "Unable to read from $file: $!\n";
- next;
- }
- print "Scanning $filename...\n";
- $c = ""; while (<IN>) { $c .= $_; } close(IN);
- $need_include = 0; %add_func = (); $changes = 0;
- $has_include = ($c =~ /#.*include.*ppport/m);
-
- foreach $func (keys %funcs) {
- if ($c =~ /#.*define.*\bNEED_$func(_GLOBAL)?\b/m) {
- if ($c !~ /\b$func\b/m) {
- print "If $func isn't needed, you don't need to request it.\n" if
- $changes += ($c =~ s/^.*#.*define.*\bNEED_$func\b.*\n//m);
- } else {
- print "Uses $func\n";
- $need_include = 1;
- }
- } else {
- if ($c =~ /\b$func\b/m) {
- $add_func{$func} =1 ;
- print "Uses $func\n";
- $need_include = 1;
- }
- }
- }
-
- if (not $need_include) {
- foreach $macro (keys %macros) {
- if ($c =~ /\b$macro\b/m) {
- print "Uses $macro\n";
- $need_include = 1;
- }
- }
- }
-
- foreach $badmacro (keys %badmacros) {
- if ($c =~ /\b$badmacro\b/m) {
- $changes += ($c =~ s/\b$badmacro\b/$badmacros{$badmacro}/gm);
- print "Uses $badmacros{$badmacro} (instead of $badmacro)\n";
- $need_include = 1;
- }
- }
-
- if (scalar(keys %add_func) or $need_include != $has_include) {
- if (!$has_include) {
- $inc = join('',map("#define NEED_$_\n", sort keys %add_func)).
- "#include \"ppport.h\"\n";
- $c = "$inc$c" unless $c =~ s/#.*include.*XSUB.*\n/$&$inc/m;
- } elsif (keys %add_func) {
- $inc = join('',map("#define NEED_$_\n", sort keys %add_func));
- $c = "$inc$c" unless $c =~ s/^.*#.*include.*ppport.*$/$inc$&/m;
- }
- if (!$need_include) {
- print "Doesn't seem to need ppport.h.\n";
- $c =~ s/^.*#.*include.*ppport.*\n//m;
- }
- $changes++;
- }
-
- if ($changes) {
- open(OUT,">/tmp/ppport.h.$$");
- print OUT $c;
- close(OUT);
- open(DIFF, "diff -u $filename /tmp/ppport.h.$$|");
- while (<DIFF>) { s!/tmp/ppport\.h\.$$!$filename.patched!; print STDOUT; }
- close(DIFF);
- unlink("/tmp/ppport.h.$$");
- } else {
- print "Looks OK\n";
- }
- }
- __DATA__
- */
-
- #ifndef _P_P_PORTABILITY_H_
- #define _P_P_PORTABILITY_H_
-
- #ifndef PERL_REVISION
- # ifndef __PATCHLEVEL_H_INCLUDED__
- # include "patchlevel.h"
- # endif
- # ifndef PERL_REVISION
- # define PERL_REVISION (5)
- /* Replace: 1 */
- # define PERL_VERSION PATCHLEVEL
- # define PERL_SUBVERSION SUBVERSION
- /* Replace PERL_PATCHLEVEL with PERL_VERSION */
- /* Replace: 0 */
- # endif
- #endif
-
- #define PERL_BCDVERSION ((PERL_REVISION * 0x1000000L) + (PERL_VERSION * 0x1000L) + PERL_SUBVERSION)
-
- /* It is very unlikely that anyone will try to use this with Perl 6
- (or greater), but who knows.
- */
- #if PERL_REVISION != 5
- # error ppport.h only works with Perl version 5
- #endif /* PERL_REVISION != 5 */
-
- #ifndef ERRSV
- # define ERRSV perl_get_sv("@",FALSE)
- #endif
-
- #if (PERL_VERSION < 4) || ((PERL_VERSION == 4) && (PERL_SUBVERSION <= 5))
- /* Replace: 1 */
- # define PL_Sv Sv
- # define PL_compiling compiling
- # define PL_copline copline
- # define PL_curcop curcop
- # define PL_curstash curstash
- # define PL_defgv defgv
- # define PL_dirty dirty
- # define PL_dowarn dowarn
- # define PL_hints hints
- # define PL_na na
- # define PL_perldb perldb
- # define PL_rsfp_filters rsfp_filters
- # define PL_rsfpv rsfp
- # define PL_stdingv stdingv
- # define PL_sv_no sv_no
- # define PL_sv_undef sv_undef
- # define PL_sv_yes sv_yes
- /* Replace: 0 */
- #endif
-
- #ifdef HASATTRIBUTE
- # if defined(__GNUC__) && defined(__cplusplus)
- # define PERL_UNUSED_DECL
- # else
- # define PERL_UNUSED_DECL __attribute__((unused))
- # endif
- #else
- # define PERL_UNUSED_DECL
- #endif
-
- #ifndef dNOOP
- # define NOOP (void)0
- # define dNOOP extern int Perl___notused PERL_UNUSED_DECL
- #endif
-
- #ifndef dTHR
- # define dTHR dNOOP
- #endif
-
- #ifndef dTHX
- # define dTHX dNOOP
- # define dTHXa(x) dNOOP
- # define dTHXoa(x) dNOOP
- #endif
-
- #ifndef pTHX
- # define pTHX void
- # define pTHX_
- # define aTHX
- # define aTHX_
- #endif
-
- /* IV could also be a quad (say, a long long), but Perls
- * capable of those should have IVSIZE already. */
- #if !defined(IVSIZE) && defined(LONGSIZE)
- # define IVSIZE LONGSIZE
- #endif
- #ifndef IVSIZE
- # define IVSIZE 4 /* A bold guess, but the best we can make. */
- #endif
-
- #ifndef UVSIZE
- # define UVSIZE IVSIZE
- #endif
-
- #ifndef NVTYPE
- # if defined(USE_LONG_DOUBLE) && defined(HAS_LONG_DOUBLE)
- # define NVTYPE long double
- # else
- # define NVTYPE double
- # endif
- typedef NVTYPE NV;
- #endif
-
- #ifndef INT2PTR
-
- #if (IVSIZE == PTRSIZE) && (UVSIZE == PTRSIZE)
- # define PTRV UV
- # define INT2PTR(any,d) (any)(d)
- #else
- # if PTRSIZE == LONGSIZE
- # define PTRV unsigned long
- # else
- # define PTRV unsigned
- # endif
- # define INT2PTR(any,d) (any)(PTRV)(d)
- #endif
- #define NUM2PTR(any,d) (any)(PTRV)(d)
- #define PTR2IV(p) INT2PTR(IV,p)
- #define PTR2UV(p) INT2PTR(UV,p)
- #define PTR2NV(p) NUM2PTR(NV,p)
- #if PTRSIZE == LONGSIZE
- # define PTR2ul(p) (unsigned long)(p)
- #else
- # define PTR2ul(p) INT2PTR(unsigned long,p)
- #endif
-
- #endif /* !INT2PTR */
-
- #ifndef boolSV
- # define boolSV(b) ((b) ? &PL_sv_yes : &PL_sv_no)
- #endif
-
- #ifndef gv_stashpvn
- # define gv_stashpvn(str,len,flags) gv_stashpv(str,flags)
- #endif
-
- #ifndef newSVpvn
- # define newSVpvn(data,len) ((len) ? newSVpv ((data), (len)) : newSVpv ("", 0))
- #endif
-
- #ifndef newRV_inc
- /* Replace: 1 */
- # define newRV_inc(sv) newRV(sv)
- /* Replace: 0 */
- #endif
-
- /* DEFSV appears first in 5.004_56 */
- #ifndef DEFSV
- # define DEFSV GvSV(PL_defgv)
- #endif
-
- #ifndef SAVE_DEFSV
- # define SAVE_DEFSV SAVESPTR(GvSV(PL_defgv))
- #endif
-
- #ifndef newRV_noinc
- # ifdef __GNUC__
- # define newRV_noinc(sv) \
- ({ \
- SV *nsv = (SV*)newRV(sv); \
- SvREFCNT_dec(sv); \
- nsv; \
- })
- # else
- # if defined(USE_THREADS)
- static SV * newRV_noinc (SV * sv)
- {
- SV *nsv = (SV*)newRV(sv);
- SvREFCNT_dec(sv);
- return nsv;
- }
- # else
- # define newRV_noinc(sv) \
- (PL_Sv=(SV*)newRV(sv), SvREFCNT_dec(sv), (SV*)PL_Sv)
- # endif
- # endif
- #endif
-
- /* Provide: newCONSTSUB */
-
- /* newCONSTSUB from IO.xs is in the core starting with 5.004_63 */
- #if (PERL_VERSION < 4) || ((PERL_VERSION == 4) && (PERL_SUBVERSION < 63))
-
- #if defined(NEED_newCONSTSUB)
- static
- #else
- extern void newCONSTSUB(HV * stash, char * name, SV *sv);
- #endif
-
- #if defined(NEED_newCONSTSUB) || defined(NEED_newCONSTSUB_GLOBAL)
- void
- newCONSTSUB(stash,name,sv)
- HV *stash;
- char *name;
- SV *sv;
- {
- U32 oldhints = PL_hints;
- HV *old_cop_stash = PL_curcop->cop_stash;
- HV *old_curstash = PL_curstash;
- line_t oldline = PL_curcop->cop_line;
- PL_curcop->cop_line = PL_copline;
-
- PL_hints &= ~HINT_BLOCK_SCOPE;
- if (stash)
- PL_curstash = PL_curcop->cop_stash = stash;
-
- newSUB(
-
- #if (PERL_VERSION < 3) || ((PERL_VERSION == 3) && (PERL_SUBVERSION < 22))
- /* before 5.003_22 */
- start_subparse(),
- #else
- # if (PERL_VERSION == 3) && (PERL_SUBVERSION == 22)
- /* 5.003_22 */
- start_subparse(0),
- # else
- /* 5.003_23 onwards */
- start_subparse(FALSE, 0),
- # endif
- #endif
-
- newSVOP(OP_CONST, 0, newSVpv(name,0)),
- newSVOP(OP_CONST, 0, &PL_sv_no), /* SvPV(&PL_sv_no) == "" -- GMB */
- newSTATEOP(0, Nullch, newSVOP(OP_CONST, 0, sv))
- );
-
- PL_hints = oldhints;
- PL_curcop->cop_stash = old_cop_stash;
- PL_curstash = old_curstash;
- PL_curcop->cop_line = oldline;
- }
- #endif
-
- #endif /* newCONSTSUB */
-
- #ifndef START_MY_CXT
-
- /*
- * Boilerplate macros for initializing and accessing interpreter-local
- * data from C. All statics in extensions should be reworked to use
- * this, if you want to make the extension thread-safe. See ext/re/re.xs
- * for an example of the use of these macros.
- *
- * Code that uses these macros is responsible for the following:
- * 1. #define MY_CXT_KEY to a unique string, e.g. "DynaLoader_guts"
- * 2. Declare a typedef named my_cxt_t that is a structure that contains
- * all the data that needs to be interpreter-local.
- * 3. Use the START_MY_CXT macro after the declaration of my_cxt_t.
- * 4. Use the MY_CXT_INIT macro such that it is called exactly once
- * (typically put in the BOOT: section).
- * 5. Use the members of the my_cxt_t structure everywhere as
- * MY_CXT.member.
- * 6. Use the dMY_CXT macro (a declaration) in all the functions that
- * access MY_CXT.
- */
-
- #if defined(MULTIPLICITY) || defined(PERL_OBJECT) || \
- defined(PERL_CAPI) || defined(PERL_IMPLICIT_CONTEXT)
-
- /* This must appear in all extensions that define a my_cxt_t structure,
- * right after the definition (i.e. at file scope). The non-threads
- * case below uses it to declare the data as static. */
- #define START_MY_CXT
-
- #if (PERL_VERSION < 4 || (PERL_VERSION == 4 && PERL_SUBVERSION < 68 ))
- /* Fetches the SV that keeps the per-interpreter data. */
- #define dMY_CXT_SV \
- SV *my_cxt_sv = perl_get_sv(MY_CXT_KEY, FALSE)
- #else /* >= perl5.004_68 */
- #define dMY_CXT_SV \
- SV *my_cxt_sv = *hv_fetch(PL_modglobal, MY_CXT_KEY, \
- sizeof(MY_CXT_KEY)-1, TRUE)
- #endif /* < perl5.004_68 */
-
- /* This declaration should be used within all functions that use the
- * interpreter-local data. */
- #define dMY_CXT \
- dMY_CXT_SV; \
- my_cxt_t *my_cxtp = INT2PTR(my_cxt_t*,SvUV(my_cxt_sv))
-
- /* Creates and zeroes the per-interpreter data.
- * (We allocate my_cxtp in a Perl SV so that it will be released when
- * the interpreter goes away.) */
- #define MY_CXT_INIT \
- dMY_CXT_SV; \
- /* newSV() allocates one more than needed */ \
- my_cxt_t *my_cxtp = (my_cxt_t*)SvPVX(newSV(sizeof(my_cxt_t)-1));\
- Zero(my_cxtp, 1, my_cxt_t); \
- sv_setuv(my_cxt_sv, PTR2UV(my_cxtp))
-
- /* This macro must be used to access members of the my_cxt_t structure.
- * e.g. MYCXT.some_data */
- #define MY_CXT (*my_cxtp)
-
- /* Judicious use of these macros can reduce the number of times dMY_CXT
- * is used. Use is similar to pTHX, aTHX etc. */
- #define pMY_CXT my_cxt_t *my_cxtp
- #define pMY_CXT_ pMY_CXT,
- #define _pMY_CXT ,pMY_CXT
- #define aMY_CXT my_cxtp
- #define aMY_CXT_ aMY_CXT,
- #define _aMY_CXT ,aMY_CXT
-
- #else /* single interpreter */
-
- #define START_MY_CXT static my_cxt_t my_cxt;
- #define dMY_CXT_SV dNOOP
- #define dMY_CXT dNOOP
- #define MY_CXT_INIT NOOP
- #define MY_CXT my_cxt
-
- #define pMY_CXT void
- #define pMY_CXT_
- #define _pMY_CXT
- #define aMY_CXT
- #define aMY_CXT_
- #define _aMY_CXT
-
- #endif
-
- #endif /* START_MY_CXT */
-
- #ifndef IVdf
- # if IVSIZE == LONGSIZE
- # define IVdf "ld"
- # define UVuf "lu"
- # define UVof "lo"
- # define UVxf "lx"
- # define UVXf "lX"
- # else
- # if IVSIZE == INTSIZE
- # define IVdf "d"
- # define UVuf "u"
- # define UVof "o"
- # define UVxf "x"
- # define UVXf "X"
- # endif
- # endif
- #endif
-
- #ifndef NVef
- # if defined(USE_LONG_DOUBLE) && defined(HAS_LONG_DOUBLE) && \
- defined(PERL_PRIfldbl) /* Not very likely, but let's try anyway. */
- # define NVef PERL_PRIeldbl
- # define NVff PERL_PRIfldbl
- # define NVgf PERL_PRIgldbl
- # else
- # define NVef "e"
- # define NVff "f"
- # define NVgf "g"
- # endif
- #endif
-
- #ifndef AvFILLp /* Older perls (<=5.003) lack AvFILLp */
- # define AvFILLp AvFILL
- #endif
-
- #ifdef SvPVbyte
- # if PERL_REVISION == 5 && PERL_VERSION < 7
- /* SvPVbyte does not work in perl-5.6.1, borrowed version for 5.7.3 */
- # undef SvPVbyte
- # define SvPVbyte(sv, lp) \
- ((SvFLAGS(sv) & (SVf_POK|SVf_UTF8)) == (SVf_POK) \
- ? ((lp = SvCUR(sv)), SvPVX(sv)) : my_sv_2pvbyte(aTHX_ sv, &lp))
- static char *
- my_sv_2pvbyte(pTHX_ register SV *sv, STRLEN *lp)
- {
- sv_utf8_downgrade(sv,0);
- return SvPV(sv,*lp);
- }
- # endif
- #else
- # define SvPVbyte SvPV
- #endif
-
- #ifndef SvPV_nolen
- # define SvPV_nolen(sv) \
- ((SvFLAGS(sv) & (SVf_POK)) == SVf_POK \
- ? SvPVX(sv) : sv_2pv_nolen(sv))
- static char *
- sv_2pv_nolen(pTHX_ register SV *sv)
- {
- STRLEN n_a;
- return sv_2pv(sv, &n_a);
- }
- #endif
-
- #endif /* _P_P_PORTABILITY_H_ */
-
- /* End of File ppport.h */
-