Make-lang.in, [...]: Find runtime source in libgnat/

2017-09-08  Nicolas Roche  <roche@adacore.com>

	* gcc-interface/Make-lang.in, gcc-interface/Makefile.in: Find runtime
	source in libgnat/
	* a-lfztio.ads, g-timsta.ads, g-sercom-linux.adb, s-osprim-solaris.adb,
	a-inteio.ads, s-stchop-rtems.adb, s-casuti.adb, s-pack39.adb,
	i-vxwork-x86.ads, a-strbou.adb, a-stzmap.adb, s-assert.adb,
	a-sfecin.ads, a-cohama.adb, s-casuti.ads, a-suenco.adb, s-pack39.ads,
	a-stzmap.ads, a-strbou.ads, s-stalib.adb, s-trasym.adb, g-comver.adb,
	s-assert.ads, s-vector.ads, g-cgi.adb, a-cohama.ads, s-wchcnv.adb,
	a-titest.adb, s-pack48.adb, a-suenco.ads, a-strunb.adb, s-stalib.ads,
	s-trasym.ads, a-nudira.adb, g-comver.ads, a-nuflra.adb, g-cgi.ads,
	a-chacon.adb, s-wchcnv.ads, a-excach.adb, s-pack48.ads, a-titest.ads,
	a-strunb.ads, s-dwalin.adb, a-nudira.ads, a-chtgbo.adb, s-resfil.adb,
	a-scteio.ads, a-nuflra.ads, g-soliop-mingw.ads, s-pack57.adb,
	a-chacon.ads, s-bytswa.ads, s-pooloc.adb, g-os_lib.adb, s-dwalin.ads,
	a-szuzha.adb, s-resfil.ads, a-chtgbo.ads, s-spsufi.adb, s-pack57.ads,
	s-pooloc.ads, g-os_lib.ads, a-stfiha.ads, a-lcteio.ads, a-wtcoau.adb,
	a-szuzha.ads, s-mmosin-unix.adb, a-stmaco.ads, s-spsufi.ads,
	s-stchop-limit.ads, a-wtcoau.ads, a-exctra.adb, s-mmosin-unix.ads,
	s-sequio.adb, s-conca2.adb, g-table.adb, s-imglli.adb,
	a-numaux-x86.adb, a-strsea.adb, s-wchstw.adb, a-clrefi.adb,
	a-wwboio.adb, a-exctra.ads, s-sequio.ads, s-conca2.ads, a-wwunio.ads,
	system-linux-hppa.ads, g-table.ads, s-dimkio.ads, s-imglli.ads,
	a-cofove.adb, a-numaux-x86.ads, s-wchstw.ads, a-strsea.ads,
	a-clrefi.ads, a-wwboio.ads, s-stratt-xdr.adb, s-crc32.adb,
	s-excmac-arm.adb, g-busora.adb, a-cofove.ads, s-osprim-unix.adb,
	g-io.adb, s-pack49.adb, s-crc32.ads, s-excmac-arm.ads, a-fzteio.ads,
	g-busora.ads, s-stausa.adb, system-linux-mips.ads, sequenio.ads,
	g-exctra.adb, g-rewdat.adb, a-cgaaso.adb, g-io.ads, s-pack49.ads,
	a-wtflau.adb, a-undesu.adb, s-stausa.ads, a-ztenau.adb, g-enutst.ads,
	calendar.ads, s-pack58.adb, g-rewdat.ads, g-exctra.ads, s-ststop.adb,
	a-cgaaso.ads, a-strfix.adb, a-comlin.adb, a-strunb-shared.adb,
	a-wtflau.ads, a-undesu.ads, a-cbhase.adb, a-ztenau.ads, s-os_lib.adb,
	a-coorse.adb, a-chlat1.ads, s-pack58.ads, s-ststop.ads, a-strfix.ads,
	a-comlin.ads, a-strunb-shared.ads, a-nscefu.ads, s-valboo.adb,
	directio.ads, a-chtgke.adb, a-cbhase.ads, a-wtinau.adb,
	system-linux-alpha.ads, s-os_lib.ads, a-coorse.ads,
	system-linux-s390.ads, s-imgwiu.adb, a-chtgop.adb, s-valboo.ads,
	a-chtgke.ads, a-tienio.adb, s-conca3.adb, a-wtinau.ads,
	system-darwin-ppc.ads, i-c.adb, s-expllu.adb, g-expect.adb,
	g-sha256.ads, s-vallld.adb, s-imgwiu.ads, a-chtgop.ads, a-strmap.adb,
	a-tienio.ads, s-conca3.ads, s-imgint.adb, i-c.ads, s-expllu.ads,
	s-osprim-darwin.adb, a-cogeso.adb, g-expect.ads, a-iwteio.ads,
	s-vallld.ads, a-coinho-shared.adb, g-shsh64.adb, a-strmap.ads,
	g-comlin.adb, a-excpol.adb, s-imgint.ads, a-ztdeau.adb, a-cogeso.ads,
	a-coinho-shared.ads, g-shsh64.ads, g-comlin.ads, a-stzsup.adb,
	a-rbtgbk.adb, a-wtmoau.adb, a-ztdeau.ads, s-exnlli.adb, g-tty.adb,
	g-heasor.adb, g-socthi-dummy.adb, s-llflex.ads, a-zchara.ads,
	a-stzsup.ads, a-ztcstr.adb, a-rbtgbk.ads, a-sfwtio.ads, a-wtmoau.ads,
	a-sulcin.adb, s-exnlli.ads, system-freebsd.ads, a-stunha.adb,
	a-charac.ads, g-tty.ads, g-heasor.ads, s-exctra.adb,
	g-socthi-dummy.ads, a-coboho.adb, a-ztcstr.ads, a-tideio.adb,
	a-sulcin.ads, a-wrstfi.adb, g-alleve.adb, s-pack59.adb, a-ngrear.adb,
	a-stboha.adb, a-stunau-shared.adb, a-stunha.ads, a-lfwtio.ads,
	s-fileio.adb, s-exctra.ads, a-coboho.ads, a-ioexce.ads, a-tideio.ads,
	a-ngrear.ads, a-wrstfi.ads, s-pack59.ads, g-alleve.ads, a-stboha.ads,
	s-poosiz.adb, g-traceb.adb, g-rannum.adb, machcode.ads, s-purexc.ads,
	s-fileio.ads, a-cfinve.adb, a-crbtgk.adb, system-solaris-x86.ads,
	s-poosiz.ads, g-rannum.ads, g-traceb.ads, a-except.adb, s-conca4.adb,
	a-stream.adb, a-cfinve.ads, a-crbtgk.ads, s-wchwts.adb,
	system-mingw.ads, a-except.ads, s-conca4.ads, a-chzla9.ads,
	s-valenu.adb, s-soflin.adb, a-stream.ads, a-cgarso.adb, s-valllu.adb,
	g-crc32.adb, s-wchwts.ads, s-fatflt.ads, s-imguns.adb, s-strcom.adb,
	g-decstr.adb, s-valenu.ads, s-soflin.ads, a-cgarso.ads, a-cwila1.ads,
	s-valllu.ads, g-crc32.ads, s-imguns.ads, g-spipat.adb, s-valwch.adb,
	s-strcom.ads, g-decstr.ads, text_io.ads, g-debuti.adb, s-stchop.adb,
	g-spipat.ads, s-valwch.ads, a-string.ads, s-exnint.adb, g-awk.adb,
	g-tasloc.adb, s-wwdenu.adb, s-boustr.adb, a-zchuni.adb, s-stchop.ads,
	g-debuti.ads, s-stopoo.adb, system-dragonfly-x86_64.ads,
	system-linux-x86.ads, s-exnint.ads, g-awk.ads, a-stzhas.adb,
	g-tasloc.ads, s-wwdenu.ads, g-debpoo.adb, g-except.ads,
	g-sse.ads, s-boustr.ads, a-zchuni.ads, s-bitops.adb, s-wwdwch.adb,
	s-stopoo.ads, a-catizo.adb, a-stzhas.ads, a-nlcefu.ads, g-debpoo.ads,
	i-vxwoio.adb, s-bitops.ads, g-io-put-vxworks.adb, s-wwdwch.ads,
	g-sehamd.adb, a-ssicst.adb, a-catizo.ads, s-mmap.adb, g-string.adb,
	s-traceb.adb, a-swunau.adb, s-rannum.adb, a-ticoau.adb, i-vxwoio.ads,
	g-sehamd.ads, a-stwiun.adb, a-ssicst.ads, s-conca5.adb, a-ssitio.ads,
	s-mmap.ads, a-zttest.adb, g-string.ads, g-sercom.adb, a-cdlili.adb,
	a-swunau.ads, s-traceb.ads, s-rannum.ads, a-ticoau.ads, system-aix.ads,
	a-cforma.adb, a-stwiun.ads, s-conca5.ads, s-carsi8.adb, a-zttest.ads,
	g-sercom.ads, a-cdlili.ads, a-cihama.adb, g-sptain.ads, a-cforma.ads,
	s-maccod.ads, s-carsi8.ads, a-strsup.adb, g-sha1.adb, a-cihama.ads,
	g-stseme.adb, s-traent.adb, s-valcha.adb, g-curexc.ads, a-strsup.ads,
	g-sha1.ads, a-sflcin.ads, s-traent.ads, s-pack10.adb, s-valcha.ads,
	a-coteio.ads, s-tasloc.adb, g-utf_32.adb, a-suteio.adb, s-except.adb,
	a-direct.adb, g-stsifd-sockets.adb, a-numaux-vxworks.ads, s-winext.ads,
	s-pack10.ads, a-ztexio.adb, a-tiflau.adb, system-vxworks-arm.ads,
	s-tasloc.ads, a-suteio.ads, g-utf_32.ads, s-except.ads,
	a-direct.ads, a-swbwha.adb, g-hesorg.adb, s-wwdcha.adb, a-wtedit.adb,
	a-ztexio.ads, a-wtcoio.adb, a-tiflau.ads, a-ssizti.ads, s-casi32.adb,
	a-swbwha.ads, s-veboop.adb, g-hesorg.ads, s-parame-rtems.adb,
	s-wwdcha.ads, a-wtedit.ads, a-stuten.adb, a-coinve.adb, a-wtcoio.ads,
	s-casi32.ads, s-string.adb, a-tiinau.adb, a-cusyqu.adb, s-conca6.adb,
	s-veboop.ads, a-cgcaso.adb, a-numaux-darwin.adb, a-envvar.adb,
	a-stuten.ads, s-secsta.adb, a-coinve.ads, s-string.ads, a-cusyqu.ads,
	a-tiinau.ads, s-osprim-vxworks.adb, s-conca6.ads, g-spchge.adb,
	s-parint.adb, a-cuprqu.adb, a-cgcaso.ads, a-numaux-darwin.ads,
	a-envvar.ads, s-secsta.ads, g-spchge.ads, s-parint.ads, a-cuprqu.ads,
	a-swuwti.adb, a-flteio.ads, a-sbhcin.adb, a-coprnu.adb, g-u3spch.adb,
	s-atocou.adb, g-ctrl_c.adb, a-swuwti.ads, a-calend.adb, a-sbhcin.ads,
	a-coprnu.ads, g-dirope.adb, g-sha512.ads, g-u3spch.ads, s-atocou.ads,
	g-ctrl_c.ads, a-timoau.adb, a-witeio.adb, s-pack11.adb, a-strhas.adb,
	a-wtflio.adb, g-spitbo.adb, a-calend.ads, a-ztenio.adb, g-dirope.ads,
	a-slcain.adb, g-sechas.adb, a-timoau.ads, a-witeio.ads, s-pack11.ads,
	s-shasto.adb, s-traceb-mastop.adb, a-ciorse.adb, s-utf_32.adb,
	a-strhas.ads, a-wtflio.ads, g-spitbo.ads, a-ztenio.ads, a-slcain.ads,
	g-sechas.ads, s-gearop.adb, a-siztio.ads, s-pack20.adb, s-shasto.ads,
	a-ciorse.ads, s-utf_32.ads, s-crtl.ads, a-wtinio.adb, s-elaall.adb,
	s-explli.adb, s-chepoo.ads, s-gearop.ads, a-einuoc.adb, s-pack20.ads,
	system-linux-ia64.ads, a-swunau-shared.adb, a-wtinio.ads, g-alvety.ads,
	a-liztio.ads, g-calend.adb, s-conca7.adb, s-elaall.ads, s-explli.ads,
	a-einuoc.ads, s-widboo.adb, s-imgdec.adb, a-cbhama.adb, g-calend.ads,
	s-conca7.ads, a-llitio.ads, i-cexten.ads, a-coorma.adb, s-widboo.ads,
	s-diflio.adb, g-souinf.ads, s-imgdec.ads, g-strhas.ads, a-cbhama.ads,
	g-shshco.adb, a-ztdeio.adb, s-gloloc.adb, a-coorma.ads, g-wispch.adb,
	s-pack03.adb, g-eacodu.adb, s-casi16.adb, s-diflio.ads, a-colien.adb,
	g-shshco.ads, a-wtmoio.adb, a-rbtgbo.adb, a-ztdeio.ads,
	system-rtems.ads, s-gloloc.ads, a-csquin.ads, a-cofuse.adb,
	g-wispch.ads, s-pack03.ads, s-casi16.ads, s-io.adb, a-colien.ads,
	g-alveop.adb, gnat.ads, s-diinio.adb, a-cfdlli.adb, g-pehage.adb,
	a-wtmoio.ads, a-stwiha.adb, a-locale.adb, a-tirsfi.adb, a-nscoty.ads,
	a-rbtgbo.ads, s-pack12.adb, a-cofuse.ads, a-sfteio.ads, s-io.ads,
	g-alveop.ads, a-cfdlli.ads, s-diinio.ads, a-stwiha.ads, g-pehage.ads,
	a-locale.ads, a-tirsfi.ads, s-pack12.ads, s-valuti.adb, g-cppexc.adb,
	system-vxworks-ppc.ads, g-memdum.adb, a-lfteio.ads, s-pack21.adb,
	s-unstyp.ads, s-valuti.ads, g-cppexc.ads, system-hpux-ia64.ads,
	g-memdum.ads, g-soccon.ads, g-altive.ads, a-crbtgo.adb, s-pack21.ads,
	a-llizti.ads, a-numaux-libc-x86.ads, s-expint.adb, s-conca8.adb,
	a-crbtgo.ads, s-pack30.adb, s-vallli.adb, s-geveop.adb, s-expint.ads,
	a-direio.adb, s-conca8.ads, a-widcha.ads, s-pack30.ads, s-vallli.ads,
	s-strhas.adb, s-geveop.ads, g-md5.adb, a-direio.ads, a-numaux.ads,
	s-ransee.adb, a-szbzha.adb, i-cobol.adb, g-busorg.adb, s-strhas.ads,
	g-md5.ads, s-widenu.adb, s-ransee.ads, s-widllu.adb, a-szbzha.ads,
	a-ststio.adb, i-cobol.ads, g-busorg.ads, g-regpat.adb, s-widenu.ads,
	a-secain.adb, s-widllu.ads, s-pack13.adb, g-encstr.adb, a-ztcoau.adb,
	a-ststio.ads, s-widwch.adb, g-regpat.ads, s-atacco.adb, a-cborse.adb,
	a-secain.ads, s-pack13.ads, g-encstr.ads, a-ztcoau.ads, s-widwch.ads,
	g-io_aux.adb, s-atacco.ads, a-ncelfu.ads, interfac.ads, a-cborse.ads,
	g-regexp.adb, s-pack22.adb, a-szuzti.adb, g-io_aux.ads, s-caun32.adb,
	a-nselfu.ads, g-regexp.ads, s-pack22.ads, a-ticoio.adb, a-szuzti.ads,
	g-diopit.adb, s-caun32.ads, s-conca9.adb, a-tags.adb, a-swmwco.ads,
	a-sbecin.adb, s-pack31.adb, s-expuns.adb, a-ticoio.ads, s-valint.adb,
	s-conca9.ads, g-diopit.ads, a-tags.ads, a-nllcef.ads, a-izteio.ads,
	a-sbecin.ads, s-expuns.ads, s-pack31.ads, g-dyntab.adb, s-powtab.ads,
	s-flocon-none.adb, s-valint.ads, a-ssiwti.ads, s-mmosin-mingw.adb,
	s-pack40.adb, s-pack05.adb, a-ztflau.adb, g-dyntab.ads,
	a-szuzti-shared.adb, g-alvevi.ads, a-stwise.adb, s-mmosin-mingw.ads,
	s-pack40.ads, a-diocst.adb, a-ztflau.ads, s-pack05.ads, a-nlcoty.ads,
	a-contai.ads, a-stwisu.adb, g-byorma.adb, a-siwtio.ads, a-stwise.ads,
	s-regpat.adb, g-mbdira.adb, s-pack14.adb, a-diocst.ads, g-flocon.ads,
	g-mbflra.adb, a-ztinau.adb, s-dim.ads, s-mantis.adb, a-stwisu.ads,
	g-byorma.ads, s-atopri.adb, g-wistsp.ads, a-uncdea.ads, s-widcha.adb,
	a-caldel.adb, s-regpat.ads, g-mbdira.ads, a-tiflio.adb, s-pack14.ads,
	s-parame.adb, a-liwtio.ads, s-memory.adb, g-mbflra.ads, a-ztinau.ads,
	a-wtgeau.adb, s-direio.adb, s-mantis.ads, s-atopri.ads, s-widcha.ads,
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	a-llftio.ads, s-memory.ads, s-regexp.adb, a-wtgeau.ads, a-exexda.adb,
	s-direio.ads, s-pack23.ads, g-stheme.adb, a-tiinio.adb, g-sestin.ads,
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	a-ztmoau.adb, a-cohata.ads, a-wtfiio.ads, s-imgrea.adb, ada.ads,
	a-szunau-shared.adb, a-comutr.ads, s-valuns.adb, a-ztmoau.ads,
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	a-elchha.adb, s-pack33.ads, a-cofuve.adb, s-parame-vxworks.ads,
	a-ciorma.ads, system-darwin-x86.ads, s-multip.adb, a-stwiun-shared.adb,
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	a-coormu.adb, a-siocst.adb, s-win32.ads, a-elchha.ads, s-pack42.adb,
	s-pack07.adb, a-cofuve.ads, system-hpux.ads, a-teioed.adb,
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	s-osprim-mingw.adb, s-casi64.adb, g-strspl.ads, g-socthi.ads,
	g-socket-dummy.adb, s-pack51.ads, s-dimmks.ads, s-casi64.ads,
	a-wtenau.adb, s-stchop-vxworks.adb, s-pack60.adb,
	system-solaris-sparc.ads, s-pack25.adb, g-socket-dummy.ads,
	a-exstat.adb, a-cofuma.adb, s-tsmona-linux.adb, a-wtenau.ads,
	s-pack60.ads, s-pack25.ads, i-cstrea.adb, a-cofuma.ads, g-exptty.adb,
	a-chzla1.ads, s-pack34.adb, i-cstrea.ads, s-excdeb.adb, a-iteint.ads,
	g-exptty.ads, i-pacdec.adb, s-pack34.ads, s-rident.ads, s-sopco3.adb,
	i-vxwork.ads, s-excdeb.ads, system-linux-ppc.ads, a-swuwti-shared.adb,
	s-widlli.adb, s-pack43.adb, i-pacdec.ads, a-cwila9.ads, s-sopco3.ads,
	a-fwteio.ads, s-widlli.ads, s-pack43.ads, a-suhcin.adb, a-wtdeau.adb,
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	s-pack52.adb, a-llctio.ads, a-nucoar.ads, s-pack17.adb, a-suhcin.ads,
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	a-ztfiio.ads, system-darwin-arm.ads: Move non-tasking runtime sources
	to libgnat subdirectory.

From-SVN: r251902

1 files changed, 1322 insertions, 0 deletions

diff --git a/gcc/ada/libgnat/s-fileio.adb b/gcc/ada/libgnat/s-fileio.adb
new file mode 100644
index 0000000..c8b44bd
--- /dev/null
+++ b/gcc/ada/libgnat/s-fileio.adb
@@ -0,0 +1,1322 @@
+------------------------------------------------------------------------------
+--                                                                          --
+--                         GNAT RUN-TIME COMPONENTS                         --
+--                                                                          --
+--                       S Y S T E M . F I L E _ I O                        --
+--                                                                          --
+--                                 B o d y                                  --
+--                                                                          --
+--          Copyright (C) 1992-2017, Free Software Foundation, Inc.         --
+--                                                                          --
+-- GNAT is free software;  you can  redistribute it  and/or modify it under --
+-- terms of the  GNU General Public License as published  by the Free Soft- --
+-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
+-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
+-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
+-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
+--                                                                          --
+-- As a special exception under Section 7 of GPL version 3, you are granted --
+-- additional permissions described in the GCC Runtime Library Exception,   --
+-- version 3.1, as published by the Free Software Foundation.               --
+--                                                                          --
+-- You should have received a copy of the GNU General Public License and    --
+-- a copy of the GCC Runtime Library Exception along with this program;     --
+-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
+-- <http://www.gnu.org/licenses/>.                                          --
+--                                                                          --
+-- GNAT was originally developed  by the GNAT team at  New York University. --
+-- Extensive contributions were provided by Ada Core Technologies Inc.      --
+--                                                                          --
+------------------------------------------------------------------------------
+
+with Ada.Finalization;           use Ada.Finalization;
+with Ada.IO_Exceptions;          use Ada.IO_Exceptions;
+with Ada.Unchecked_Deallocation;
+
+with Interfaces.C_Streams;       use Interfaces.C_Streams;
+
+with System.Case_Util;           use System.Case_Util;
+with System.CRTL;
+with System.OS_Lib;
+with System.Soft_Links;
+
+package body System.File_IO is
+
+   use System.File_Control_Block;
+
+   package SSL renames System.Soft_Links;
+
+   use type CRTL.size_t;
+
+   ----------------------
+   -- Global Variables --
+   ----------------------
+
+   Open_Files : AFCB_Ptr;
+   --  This points to a list of AFCB's for all open files. This is a doubly
+   --  linked list, with the Prev pointer of the first entry, and the Next
+   --  pointer of the last entry containing null. Note that this global
+   --  variable must be properly protected to provide thread safety.
+
+   type Temp_File_Record;
+   type Temp_File_Record_Ptr is access all Temp_File_Record;
+
+   type Temp_File_Record is record
+      File : AFCB_Ptr;
+      Next : aliased Temp_File_Record_Ptr;
+      Name : String (1 .. max_path_len + 1);
+   end record;
+   --  One of these is allocated for each temporary file created
+
+   Temp_Files : aliased Temp_File_Record_Ptr;
+   --  Points to list of names of temporary files. Note that this global
+   --  variable must be properly protected to provide thread safety.
+
+   procedure Free is new Ada.Unchecked_Deallocation
+     (Temp_File_Record, Temp_File_Record_Ptr);
+
+   type File_IO_Clean_Up_Type is new Limited_Controlled with null record;
+   --  The closing of all open files and deletion of temporary files is an
+   --  action that takes place at the end of execution of the main program.
+   --  This action is implemented using a library level object that gets
+   --  finalized at the end of program execution. Note that the type is
+   --  limited, in order to stop the compiler optimizing away the declaration
+   --  which would be allowed in the non-limited case.
+
+   procedure Finalize (V : in out File_IO_Clean_Up_Type);
+   --  This is the finalize operation that is used to do the cleanup
+
+   File_IO_Clean_Up_Object : File_IO_Clean_Up_Type;
+   pragma Warnings (Off, File_IO_Clean_Up_Object);
+   --  This is the single object of the type that triggers the finalization
+   --  call. Since it is at the library level, this happens just before the
+   --  environment task is finalized.
+
+   text_translation_required : Boolean;
+   for text_translation_required'Size use Character'Size;
+   pragma Import
+     (C, text_translation_required, "__gnat_text_translation_required");
+   --  If true, add appropriate suffix to control string for Open
+
+   -----------------------
+   -- Local Subprograms --
+   -----------------------
+
+   procedure Free_String is new Ada.Unchecked_Deallocation (String, Pstring);
+
+   subtype Fopen_String is String (1 .. 4);
+   --  Holds open string (longest is "w+b" & nul)
+
+   procedure Fopen_Mode
+     (Namestr : String;
+      Mode    : File_Mode;
+      Text    : Boolean;
+      Creat   : Boolean;
+      Amethod : Character;
+      Fopstr  : out Fopen_String);
+   --  Determines proper open mode for a file to be opened in the given Ada
+   --  mode. Namestr is the NUL-terminated file name. Text is true for a text
+   --  file and false otherwise, and Creat is true for a create call, and False
+   --  for an open call. The value stored in Fopstr is a nul-terminated string
+   --  suitable for a call to fopen or freopen. Amethod is the character
+   --  designating the access method from the Access_Method field of the FCB.
+
+   function Errno_Message
+     (Name  : String;
+      Errno : Integer := OS_Lib.Errno) return String;
+   --  Return Errno_Message for Errno, with file name prepended
+
+   procedure Raise_Device_Error
+     (File  : AFCB_Ptr;
+      Errno : Integer := OS_Lib.Errno);
+   pragma No_Return (Raise_Device_Error);
+   --  Clear error indication on File and raise Device_Error with an exception
+   --  message providing errno information.
+
+   ----------------
+   -- Append_Set --
+   ----------------
+
+   procedure Append_Set (File : AFCB_Ptr) is
+   begin
+      if File.Mode = Append_File then
+         if fseek (File.Stream, 0, SEEK_END) /= 0 then
+            Raise_Device_Error (File);
+         end if;
+      end if;
+   end Append_Set;
+
+   ----------------
+   -- Chain_File --
+   ----------------
+
+   procedure Chain_File (File : AFCB_Ptr) is
+   begin
+      --  Take a task lock, to protect the global data value Open_Files
+
+      SSL.Lock_Task.all;
+
+      --  Do the chaining operation locked
+
+      File.Next := Open_Files;
+      File.Prev := null;
+      Open_Files := File;
+
+      if File.Next /= null then
+         File.Next.Prev := File;
+      end if;
+
+      SSL.Unlock_Task.all;
+
+   exception
+      when others =>
+         SSL.Unlock_Task.all;
+         raise;
+   end Chain_File;
+
+   ---------------------
+   -- Check_File_Open --
+   ---------------------
+
+   procedure Check_File_Open (File : AFCB_Ptr) is
+   begin
+      if File = null then
+         raise Status_Error with "file not open";
+      end if;
+   end Check_File_Open;
+
+   -----------------------
+   -- Check_Read_Status --
+   -----------------------
+
+   procedure Check_Read_Status (File : AFCB_Ptr) is
+   begin
+      if File = null then
+         raise Status_Error with "file not open";
+      elsif File.Mode not in Read_File_Mode then
+         raise Mode_Error with "file not readable";
+      end if;
+   end Check_Read_Status;
+
+   ------------------------
+   -- Check_Write_Status --
+   ------------------------
+
+   procedure Check_Write_Status (File : AFCB_Ptr) is
+   begin
+      if File = null then
+         raise Status_Error with "file not open";
+      elsif File.Mode = In_File then
+         raise Mode_Error with "file not writable";
+      end if;
+   end Check_Write_Status;
+
+   -----------
+   -- Close --
+   -----------
+
+   procedure Close (File_Ptr : access AFCB_Ptr) is
+      Close_Status : int     := 0;
+      Dup_Strm     : Boolean := False;
+      Errno        : Integer := 0;
+
+      File : AFCB_Ptr renames File_Ptr.all;
+
+   begin
+      --  Take a task lock, to protect the global variables Open_Files and
+      --  Temp_Files, and the chains they point to.
+
+      SSL.Lock_Task.all;
+
+      Check_File_Open (File);
+      AFCB_Close (File);
+
+      --  Sever the association between the given file and its associated
+      --  external file. The given file is left closed. Do not perform system
+      --  closes on the standard input, output and error files and also do not
+      --  attempt to close a stream that does not exist (signalled by a null
+      --  stream value -- happens in some error situations).
+
+      if not File.Is_System_File and then File.Stream /= NULL_Stream then
+
+         --  Do not do an fclose if this is a shared file and there is at least
+         --  one other instance of the stream that is open.
+
+         if File.Shared_Status = Yes then
+            declare
+               P   : AFCB_Ptr;
+
+            begin
+               P := Open_Files;
+               while P /= null loop
+                  if P /= File and then File.Stream = P.Stream then
+                     Dup_Strm := True;
+                     exit;
+                  end if;
+
+                  P := P.Next;
+               end loop;
+            end;
+         end if;
+
+         --  Do the fclose unless this was a duplicate in the shared case
+
+         if not Dup_Strm then
+            Close_Status := fclose (File.Stream);
+
+            if Close_Status /= 0 then
+               Errno := OS_Lib.Errno;
+            end if;
+         end if;
+      end if;
+
+      --  Dechain file from list of open files and then free the storage
+
+      if File.Prev = null then
+         Open_Files := File.Next;
+      else
+         File.Prev.Next := File.Next;
+      end if;
+
+      if File.Next /= null then
+         File.Next.Prev := File.Prev;
+      end if;
+
+      --  If it's a temp file, remove the corresponding record from Temp_Files,
+      --  and delete the file. There are unlikely to be large numbers of temp
+      --  files open, so a linear search is sufficiently efficient. Note that
+      --  we don't need to check for end of list, because the file must be
+      --  somewhere on the list. Note that as for Finalize, we ignore any
+      --  errors while attempting the unlink operation.
+
+      if File.Is_Temporary_File then
+         declare
+            Temp : access Temp_File_Record_Ptr := Temp_Files'Access;
+            --  Note the double indirection here
+
+            Discard  : int;
+            New_Temp : Temp_File_Record_Ptr;
+
+         begin
+            while Temp.all.all.File /= File loop
+               Temp := Temp.all.all.Next'Access;
+            end loop;
+
+            Discard  := unlink (Temp.all.all.Name'Address);
+            New_Temp := Temp.all.all.Next;
+            Free (Temp.all);
+            Temp.all := New_Temp;
+         end;
+      end if;
+
+      --  Deallocate some parts of the file structure that were kept in heap
+      --  storage with the exception of system files (standard input, output
+      --  and error) since they had some information allocated in the stack.
+
+      if not File.Is_System_File then
+         Free_String (File.Name);
+         Free_String (File.Form);
+         AFCB_Free (File);
+      end if;
+
+      File := null;
+
+      if Close_Status /= 0 then
+         Raise_Device_Error (null, Errno);
+      end if;
+
+      SSL.Unlock_Task.all;
+
+   exception
+      when others =>
+         SSL.Unlock_Task.all;
+         raise;
+   end Close;
+
+   ------------
+   -- Delete --
+   ------------
+
+   procedure Delete (File_Ptr : access AFCB_Ptr) is
+      File : AFCB_Ptr renames File_Ptr.all;
+
+   begin
+      Check_File_Open (File);
+
+      if not File.Is_Regular_File then
+         raise Use_Error with "cannot delete non-regular file";
+      end if;
+
+      declare
+         Filename : aliased constant String := File.Name.all;
+         Is_Temporary_File : constant Boolean := File.Is_Temporary_File;
+
+      begin
+         Close (File_Ptr);
+
+         --  Now unlink the external file. Note that we use the full name in
+         --  this unlink, because the working directory may have changed since
+         --  we did the open, and we want to unlink the right file. However, if
+         --  it's a temporary file, then closing it already unlinked it.
+
+         if not Is_Temporary_File then
+            if unlink (Filename'Address) = -1 then
+               raise Use_Error with OS_Lib.Errno_Message;
+            end if;
+         end if;
+      end;
+   end Delete;
+
+   -----------------
+   -- End_Of_File --
+   -----------------
+
+   function End_Of_File (File : AFCB_Ptr) return Boolean is
+   begin
+      Check_File_Open (File);
+
+      if feof (File.Stream) /= 0 then
+         return True;
+
+      else
+         Check_Read_Status (File);
+
+         if ungetc (fgetc (File.Stream), File.Stream) = EOF then
+            clearerr (File.Stream);
+            return True;
+         else
+            return False;
+         end if;
+      end if;
+   end End_Of_File;
+
+   -------------------
+   -- Errno_Message --
+   -------------------
+
+   function Errno_Message
+     (Name  : String;
+      Errno : Integer := OS_Lib.Errno) return String
+   is
+   begin
+      return Name & ": " & OS_Lib.Errno_Message (Err => Errno);
+   end Errno_Message;
+
+   --------------
+   -- Finalize --
+   --------------
+
+   procedure Finalize (V : in out File_IO_Clean_Up_Type) is
+      pragma Warnings (Off, V);
+
+      Fptr1   : aliased AFCB_Ptr;
+      Fptr2   : AFCB_Ptr;
+
+      Discard : int;
+
+   begin
+      --  Take a lock to protect global Open_Files data structure
+
+      SSL.Lock_Task.all;
+
+      --  First close all open files (the slightly complex form of this loop is
+      --  required because Close nulls out its argument).
+
+      Fptr1 := Open_Files;
+      while Fptr1 /= null loop
+         Fptr2 := Fptr1.Next;
+         Close (Fptr1'Access);
+         Fptr1 := Fptr2;
+      end loop;
+
+      --  Now unlink all temporary files. We do not bother to free the blocks
+      --  because we are just about to terminate the program. We also ignore
+      --  any errors while attempting these unlink operations.
+
+      while Temp_Files /= null loop
+         Discard := unlink (Temp_Files.Name'Address);
+         Temp_Files := Temp_Files.Next;
+      end loop;
+
+      SSL.Unlock_Task.all;
+
+   exception
+      when others =>
+         SSL.Unlock_Task.all;
+         raise;
+   end Finalize;
+
+   -----------
+   -- Flush --
+   -----------
+
+   procedure Flush (File : AFCB_Ptr) is
+   begin
+      Check_Write_Status (File);
+
+      if fflush (File.Stream) /= 0 then
+         Raise_Device_Error (File);
+      end if;
+   end Flush;
+
+   ----------------
+   -- Fopen_Mode --
+   ----------------
+
+   --  The fopen mode to be used is shown by the following table:
+
+   --                                     OPEN         CREATE
+   --     Append_File                     "r+"           "w+"
+   --     In_File                         "r"            "w+"
+   --     Out_File (Direct_IO, Stream_IO) "r+" [*]       "w"
+   --     Out_File (others)               "w"            "w"
+   --     Inout_File                      "r+"           "w+"
+
+   --  [*] Except that for Out_File, if the file exists and is a fifo (i.e. a
+   --  named pipe), we use "w" instead of "r+". This is necessary to make a
+   --  write to the fifo block until a reader is ready.
+
+   --  Note: we do not use "a" or "a+" for Append_File, since this would not
+   --  work in the case of stream files, where even if in append file mode,
+   --  you can reset to earlier points in the file. The caller must use the
+   --  Append_Set routine to deal with the necessary positioning.
+
+   --  Note: in several cases, the fopen mode used allows reading and writing,
+   --  but the setting of the Ada mode is more restrictive. For instance,
+   --  Create in In_File mode uses "w+" which allows writing, but the Ada mode
+   --  In_File will cause any write operations to be rejected with Mode_Error
+   --  in any case.
+
+   --  Note: for the Out_File/Open cases for other than the Direct_IO case, an
+   --  initial call will be made by the caller to first open the file in "r"
+   --  mode to be sure that it exists. The real open, in "w" mode, will then
+   --  destroy this file. This is peculiar, but that's what Ada semantics
+   --  require and the ACATS tests insist on.
+
+   --  If text file translation is required, then either "b" or "t" is appended
+   --  to the mode, depending on the setting of Text.
+
+   procedure Fopen_Mode
+     (Namestr : String;
+      Mode    : File_Mode;
+      Text    : Boolean;
+      Creat   : Boolean;
+      Amethod : Character;
+      Fopstr  : out Fopen_String)
+   is
+      Fptr : Positive;
+
+      function is_fifo (Path : Address) return Integer;
+      pragma Import (C, is_fifo, "__gnat_is_fifo");
+
+   begin
+      case Mode is
+         when In_File =>
+            if Creat then
+               Fopstr (1) := 'w';
+               Fopstr (2) := '+';
+               Fptr := 3;
+            else
+               Fopstr (1) := 'r';
+               Fptr := 2;
+            end if;
+
+         when Out_File =>
+            if Amethod in 'D' | 'S'
+              and then not Creat
+              and then is_fifo (Namestr'Address) = 0
+            then
+               Fopstr (1) := 'r';
+               Fopstr (2) := '+';
+               Fptr := 3;
+            else
+               Fopstr (1) := 'w';
+               Fptr := 2;
+            end if;
+
+         when Append_File
+            | Inout_File
+         =>
+            Fopstr (1) := (if Creat then 'w' else 'r');
+            Fopstr (2) := '+';
+            Fptr := 3;
+      end case;
+
+      --  If text_translation_required is true then we need to append either a
+      --  "t" or "b" to the string to get the right mode.
+
+      if text_translation_required then
+         Fopstr (Fptr) := (if Text then 't' else 'b');
+         Fptr := Fptr + 1;
+      end if;
+
+      Fopstr (Fptr) := ASCII.NUL;
+   end Fopen_Mode;
+
+   ----------
+   -- Form --
+   ----------
+
+   function Form (File : AFCB_Ptr) return String is
+   begin
+      if File = null then
+         raise Status_Error with "Form: file not open";
+      else
+         return File.Form.all (1 .. File.Form'Length - 1);
+      end if;
+   end Form;
+
+   ------------------
+   -- Form_Boolean --
+   ------------------
+
+   function Form_Boolean
+     (Form    : String;
+      Keyword : String;
+      Default : Boolean) return Boolean
+   is
+      V1, V2 : Natural;
+      pragma Unreferenced (V2);
+
+   begin
+      Form_Parameter (Form, Keyword, V1, V2);
+
+      if V1 = 0 then
+         return Default;
+      elsif Form (V1) = 'y' then
+         return True;
+      elsif Form (V1) = 'n' then
+         return False;
+      else
+         raise Use_Error with "invalid Form";
+      end if;
+   end Form_Boolean;
+
+   ------------------
+   -- Form_Integer --
+   ------------------
+
+   function Form_Integer
+     (Form    : String;
+      Keyword : String;
+      Default : Integer) return Integer
+   is
+      V1, V2 : Natural;
+      V      : Integer;
+
+   begin
+      Form_Parameter (Form, Keyword, V1, V2);
+
+      if V1 = 0 then
+         return Default;
+
+      else
+         V := 0;
+
+         for J in V1 .. V2 loop
+            if Form (J) not in '0' .. '9' then
+               raise Use_Error with "invalid Form";
+            else
+               V := V * 10 + Character'Pos (Form (J)) - Character'Pos ('0');
+            end if;
+
+            if V > 999_999 then
+               raise Use_Error with "invalid Form";
+            end if;
+         end loop;
+
+         return V;
+      end if;
+   end Form_Integer;
+
+   --------------------
+   -- Form_Parameter --
+   --------------------
+
+   procedure Form_Parameter
+     (Form    : String;
+      Keyword : String;
+      Start   : out Natural;
+      Stop    : out Natural)
+   is
+      Klen : constant Integer := Keyword'Length;
+
+   begin
+      for J in Form'First + Klen .. Form'Last - 1 loop
+         if Form (J) = '='
+           and then Form (J - Klen .. J - 1) = Keyword
+         then
+            Start := J + 1;
+            Stop := Start - 1;
+            while Form (Stop + 1) /= ASCII.NUL
+              and then Form (Stop + 1) /= ','
+            loop
+               Stop := Stop + 1;
+            end loop;
+
+            return;
+         end if;
+      end loop;
+
+      Start := 0;
+      Stop  := 0;
+   end Form_Parameter;
+
+   -------------
+   -- Is_Open --
+   -------------
+
+   function Is_Open (File : AFCB_Ptr) return Boolean is
+   begin
+      --  We return True if the file is open, and the underlying file stream is
+      --  usable. In particular on Windows an application linked with -mwindows
+      --  option set does not have a console attached. In this case standard
+      --  files (Current_Output, Current_Error, Current_Input) are not created.
+      --  We want Is_Open (Current_Output) to return False in this case.
+
+      return File /= null and then fileno (File.Stream) /= -1;
+   end Is_Open;
+
+   -------------------
+   -- Make_Buffered --
+   -------------------
+
+   procedure Make_Buffered
+     (File    : AFCB_Ptr;
+      Buf_Siz : Interfaces.C_Streams.size_t)
+   is
+      status : Integer;
+      pragma Unreferenced (status);
+
+   begin
+      status := setvbuf (File.Stream, Null_Address, IOFBF, Buf_Siz);
+   end Make_Buffered;
+
+   ------------------------
+   -- Make_Line_Buffered --
+   ------------------------
+
+   procedure Make_Line_Buffered
+     (File     : AFCB_Ptr;
+      Line_Siz : Interfaces.C_Streams.size_t)
+   is
+      status : Integer;
+      pragma Unreferenced (status);
+
+   begin
+      status := setvbuf (File.Stream, Null_Address, IOLBF, Line_Siz);
+      --  No error checking???
+   end Make_Line_Buffered;
+
+   ---------------------
+   -- Make_Unbuffered --
+   ---------------------
+
+   procedure Make_Unbuffered (File : AFCB_Ptr) is
+      status : Integer;
+      pragma Unreferenced (status);
+
+   begin
+      status := setvbuf (File.Stream, Null_Address, IONBF, 0);
+      --  No error checking???
+   end Make_Unbuffered;
+
+   ----------
+   -- Mode --
+   ----------
+
+   function Mode (File : AFCB_Ptr) return File_Mode is
+   begin
+      if File = null then
+         raise Status_Error with "Mode: file not open";
+      else
+         return File.Mode;
+      end if;
+   end Mode;
+
+   ----------
+   -- Name --
+   ----------
+
+   function Name (File : AFCB_Ptr) return String is
+   begin
+      if File = null then
+         raise Status_Error with "Name: file not open";
+      else
+         return File.Name.all (1 .. File.Name'Length - 1);
+      end if;
+   end Name;
+
+   ----------
+   -- Open --
+   ----------
+
+   procedure Open
+     (File_Ptr  : in out AFCB_Ptr;
+      Dummy_FCB : AFCB'Class;
+      Mode      : File_Mode;
+      Name      : String;
+      Form      : String;
+      Amethod   : Character;
+      Creat     : Boolean;
+      Text      : Boolean;
+      C_Stream  : FILEs := NULL_Stream)
+   is
+      pragma Warnings (Off, Dummy_FCB);
+      --  Yes we know this is never assigned a value. That's intended, since
+      --  all we ever use of this value is the tag for dispatching purposes.
+
+      procedure Tmp_Name (Buffer : Address);
+      pragma Import (C, Tmp_Name, "__gnat_tmp_name");
+      --  Set buffer (a String address) with a temporary filename
+
+      function Get_Case_Sensitive return Integer;
+      pragma Import (C, Get_Case_Sensitive,
+                     "__gnat_get_file_names_case_sensitive");
+
+      procedure Record_AFCB;
+      --  Create and record new AFCB into the runtime, note that the
+      --  implementation uses the variables below which corresponds to the
+      --  status of the opened file.
+
+      File_Names_Case_Sensitive : constant Boolean := Get_Case_Sensitive /= 0;
+      --  Set to indicate whether the operating system convention is for file
+      --  names to be case sensitive (e.g., in Unix, set True), or not case
+      --  sensitive (e.g., in Windows, set False). Declared locally to avoid
+      --  breaking the Preelaborate rule that disallows function calls at the
+      --  library level.
+
+      Stream : FILEs := C_Stream;
+      --  Stream which we open in response to this request
+
+      Shared : Shared_Status_Type;
+      --  Setting of Shared_Status field for file
+
+      Fopstr : aliased Fopen_String;
+      --  Mode string used in fopen call
+
+      Formstr : aliased String (1 .. Form'Length + 1);
+      --  Form string with ASCII.NUL appended, folded to lower case
+
+      Text_Encoding : Content_Encoding;
+
+      Tempfile : constant Boolean := Name = "";
+      --  Indicates temporary file case, which is indicated by an empty file
+      --  name.
+
+      Namelen : constant Integer := max_path_len;
+      --  Length required for file name, not including final ASCII.NUL.
+      --  Note that we used to reference L_tmpnam here, which is not reliable
+      --  since __gnat_tmp_name does not always use tmpnam.
+
+      Namestr : aliased String (1 .. Namelen + 1);
+      --  Name as given or temporary file name with ASCII.NUL appended
+
+      Fullname : aliased String (1 .. max_path_len + 1);
+      --  Full name (as required for Name function, and as stored in the
+      --  control block in the Name field) with ASCII.NUL appended.
+
+      Full_Name_Len : Integer;
+      --  Length of name actually stored in Fullname
+
+      Encoding : CRTL.Filename_Encoding;
+      --  Filename encoding specified into the form parameter
+
+      -----------------
+      -- Record_AFCB --
+      -----------------
+
+      procedure Record_AFCB is
+      begin
+         File_Ptr := AFCB_Allocate (Dummy_FCB);
+
+         --  Note that we cannot use an aggregate here as File_Ptr is a
+         --  class-wide access to a limited type (Root_Stream_Type).
+
+         File_Ptr.Is_Regular_File   := is_regular_file (fileno (Stream)) /= 0;
+         File_Ptr.Is_System_File    := False;
+         File_Ptr.Text_Encoding     := Text_Encoding;
+         File_Ptr.Shared_Status     := Shared;
+         File_Ptr.Access_Method     := Amethod;
+         File_Ptr.Stream            := Stream;
+         File_Ptr.Form              := new String'(Formstr);
+         File_Ptr.Name              := new String'(Fullname
+                                                     (1 .. Full_Name_Len));
+         File_Ptr.Mode              := Mode;
+         File_Ptr.Is_Temporary_File := Tempfile;
+         File_Ptr.Encoding          := Encoding;
+
+         Chain_File (File_Ptr);
+         Append_Set (File_Ptr);
+      end Record_AFCB;
+
+   --  Start of processing for Open
+
+   begin
+      if File_Ptr /= null then
+         raise Status_Error with "file already open";
+      end if;
+
+      --  Acquire form string, setting required NUL terminator
+
+      Formstr (1 .. Form'Length) := Form;
+      Formstr (Formstr'Last) := ASCII.NUL;
+
+      --  Convert form string to lower case
+
+      for J in Formstr'Range loop
+         if Formstr (J) in 'A' .. 'Z' then
+            Formstr (J) := Character'Val (Character'Pos (Formstr (J)) + 32);
+         end if;
+      end loop;
+
+      --  Acquire setting of shared parameter
+
+      declare
+         V1, V2 : Natural;
+
+      begin
+         Form_Parameter (Formstr, "shared", V1, V2);
+
+         if V1 = 0 then
+            Shared := None;
+         elsif Formstr (V1 .. V2) = "yes" then
+            Shared := Yes;
+         elsif Formstr (V1 .. V2) = "no" then
+            Shared := No;
+         else
+            raise Use_Error with "invalid Form";
+         end if;
+      end;
+
+      --  Acquire setting of encoding parameter
+
+      declare
+         V1, V2 : Natural;
+
+      begin
+         Form_Parameter (Formstr, "encoding", V1, V2);
+
+         if V1 = 0 then
+            Encoding := CRTL.Unspecified;
+         elsif Formstr (V1 .. V2) = "utf8" then
+            Encoding := CRTL.UTF8;
+         elsif Formstr (V1 .. V2) = "8bits" then
+            Encoding := CRTL.ASCII_8bits;
+         else
+            raise Use_Error with "invalid Form";
+         end if;
+      end;
+
+      --  Acquire setting of text_translation parameter. Only needed if this is
+      --  a [Wide_[Wide_]]Text_IO file, in which case we default to True, but
+      --  if the Form says Text_Translation=No, we use binary mode, so new-line
+      --  will be just LF, even on Windows.
+
+      if Text then
+         Text_Encoding := Default_Text;
+      else
+         Text_Encoding := None;
+      end if;
+
+      if Text_Encoding in Text_Content_Encoding then
+         declare
+            V1, V2 : Natural;
+
+         begin
+            Form_Parameter (Formstr, "text_translation", V1, V2);
+
+            if V1 = 0 then
+               null;
+            elsif Formstr (V1 .. V2) = "no" then
+               Text_Encoding := None;
+            elsif Formstr (V1 .. V2) = "text"
+              or else Formstr (V1 .. V2) = "yes"
+            then
+               Text_Encoding := Interfaces.C_Streams.Text;
+            elsif Formstr (V1 .. V2) = "wtext" then
+               Text_Encoding := Wtext;
+            elsif Formstr (V1 .. V2) = "u8text" then
+               Text_Encoding := U8text;
+            elsif Formstr (V1 .. V2) = "u16text" then
+               Text_Encoding := U16text;
+            else
+               raise Use_Error with "invalid Form";
+            end if;
+         end;
+      end if;
+
+      --  If we were given a stream (call from xxx.C_Streams.Open), then set
+      --  the full name to the given one, and skip to end of processing.
+
+      if Stream /= NULL_Stream then
+         Full_Name_Len := Name'Length + 1;
+         Fullname (1 .. Full_Name_Len - 1) := Name;
+         Fullname (Full_Name_Len) := ASCII.NUL;
+
+      --  Normal case of Open or Create
+
+      else
+         --  If temporary file case, get temporary file name and add to the
+         --  list of temporary files to be deleted on exit.
+
+         if Tempfile then
+            if not Creat then
+               raise Name_Error with "opening temp file without creating it";
+            end if;
+
+            Tmp_Name (Namestr'Address);
+
+            if Namestr (1) = ASCII.NUL then
+               raise Use_Error with "invalid temp file name";
+            end if;
+
+         --  Normal case of non-empty name given (i.e. not a temp file)
+
+         else
+            if Name'Length > Namelen then
+               raise Name_Error with "file name too long";
+            end if;
+
+            Namestr (1 .. Name'Length) := Name;
+            Namestr (Name'Length + 1)  := ASCII.NUL;
+         end if;
+
+         --  Get full name in accordance with the advice of RM A.8.2(22)
+
+         full_name (Namestr'Address, Fullname'Address);
+
+         if Fullname (1) = ASCII.NUL then
+            raise Use_Error with Errno_Message (Name);
+         end if;
+
+         Full_Name_Len := 1;
+         while Full_Name_Len < Fullname'Last
+           and then Fullname (Full_Name_Len) /= ASCII.NUL
+         loop
+            Full_Name_Len := Full_Name_Len + 1;
+         end loop;
+
+         --  Fullname is generated by calling system's full_name. The problem
+         --  is, full_name does nothing about the casing, so a file name
+         --  comparison may generally speaking not be valid on non-case-
+         --  sensitive systems, and in particular we get unexpected failures
+         --  on Windows/Vista because of this. So we use s-casuti to force
+         --  the name to lower case.
+
+         if not File_Names_Case_Sensitive then
+            To_Lower (Fullname (1 .. Full_Name_Len));
+         end if;
+
+         --  If Shared=None or Shared=Yes, then check for the existence of
+         --  another file with exactly the same full name.
+
+         if Shared /= No then
+            declare
+               P : AFCB_Ptr;
+
+            begin
+               --  Take a task lock to protect Open_Files
+
+               SSL.Lock_Task.all;
+
+               --  Search list of open files
+
+               P := Open_Files;
+               while P /= null loop
+                  if Fullname (1 .. Full_Name_Len) = P.Name.all then
+
+                     --  If we get a match, and either file has Shared=None,
+                     --  then raise Use_Error, since we don't allow two files
+                     --  of the same name to be opened unless they specify the
+                     --  required sharing mode.
+
+                     if Shared = None
+                       or else P.Shared_Status = None
+                     then
+                        raise Use_Error with "reopening shared file";
+
+                     --  If both files have Shared=Yes, then we acquire the
+                     --  stream from the located file to use as our stream.
+
+                     elsif Shared = Yes
+                       and then P.Shared_Status = Yes
+                     then
+                        Stream := P.Stream;
+
+                        Record_AFCB;
+                        pragma Assert (not Tempfile);
+
+                        exit;
+
+                     --  Otherwise one of the files has Shared=Yes and one has
+                     --  Shared=No. If the current file has Shared=No then all
+                     --  is well but we don't want to share any other file's
+                     --  stream. If the current file has Shared=Yes, we would
+                     --  like to share a stream, but not from a file that has
+                     --  Shared=No, so either way, we just continue the search.
+
+                     else
+                        null;
+                     end if;
+                  end if;
+
+                  P := P.Next;
+               end loop;
+
+               SSL.Unlock_Task.all;
+
+            exception
+               when others =>
+                  SSL.Unlock_Task.all;
+                  raise;
+            end;
+         end if;
+
+         --  Open specified file if we did not find an existing stream,
+         --  otherwise we just return as there is nothing more to be done.
+
+         if Stream /= NULL_Stream then
+            return;
+
+         else
+            Fopen_Mode
+              (Namestr => Namestr,
+               Mode    => Mode,
+               Text    => Text_Encoding in Text_Content_Encoding,
+               Creat   => Creat,
+               Amethod => Amethod,
+               Fopstr  => Fopstr);
+
+            --  A special case, if we are opening (OPEN case) a file and the
+            --  mode returned by Fopen_Mode is not "r" or "r+", then we first
+            --  make sure that the file exists as required by Ada semantics.
+
+            if not Creat and then Fopstr (1) /= 'r' then
+               if file_exists (Namestr'Address) = 0 then
+                  raise Name_Error with Errno_Message (Name);
+               end if;
+            end if;
+
+            --  Now open the file. Note that we use the name as given in the
+            --  original Open call for this purpose, since that seems the
+            --  clearest implementation of the intent. It would presumably
+            --  work to use the full name here, but if there is any difference,
+            --  then we should use the name used in the call.
+
+            --  Note: for a corresponding delete, we will use the full name,
+            --  since by the time of the delete, the current working directory
+            --  may have changed and we do not want to delete a different file.
+
+            Stream :=
+              fopen (Namestr'Address, Fopstr'Address, Encoding);
+
+            if Stream = NULL_Stream then
+
+               --  Raise Name_Error if trying to open a non-existent file.
+               --  Otherwise raise Use_Error.
+
+               --  Should we raise Device_Error for ENOSPC???
+
+               declare
+                  function Is_File_Not_Found_Error
+                    (Errno_Value : Integer) return Integer;
+                  pragma Import
+                    (C, Is_File_Not_Found_Error,
+                     "__gnat_is_file_not_found_error");
+                  --  Non-zero when the given errno value indicates a non-
+                  --  existing file.
+
+                  Errno   : constant Integer := OS_Lib.Errno;
+                  Message : constant String := Errno_Message (Name, Errno);
+
+               begin
+                  if Is_File_Not_Found_Error (Errno) /= 0 then
+                     raise Name_Error with Message;
+                  else
+                     raise Use_Error with Message;
+                  end if;
+               end;
+            end if;
+         end if;
+      end if;
+
+      --  Stream has been successfully located or opened, so now we are
+      --  committed to completing the opening of the file. Allocate block on
+      --  heap and fill in its fields.
+
+      Record_AFCB;
+
+      if Tempfile then
+         --  Chain to temp file list, ensuring thread safety with a lock
+
+         begin
+            SSL.Lock_Task.all;
+            Temp_Files :=
+              new Temp_File_Record'
+                (File => File_Ptr, Name => Namestr, Next => Temp_Files);
+            SSL.Unlock_Task.all;
+
+         exception
+            when others =>
+               SSL.Unlock_Task.all;
+               raise;
+         end;
+      end if;
+   end Open;
+
+   ------------------------
+   -- Raise_Device_Error --
+   ------------------------
+
+   procedure Raise_Device_Error
+     (File  : AFCB_Ptr;
+      Errno : Integer := OS_Lib.Errno)
+   is
+   begin
+      --  Clear error status so that the same error is not reported twice
+
+      if File /= null then
+         clearerr (File.Stream);
+      end if;
+
+      raise Device_Error with OS_Lib.Errno_Message (Err => Errno);
+   end Raise_Device_Error;
+
+   --------------
+   -- Read_Buf --
+   --------------
+
+   procedure Read_Buf (File : AFCB_Ptr; Buf : Address; Siz : size_t) is
+      Nread : size_t;
+
+   begin
+      Nread := fread (Buf, 1, Siz, File.Stream);
+
+      if Nread = Siz then
+         return;
+
+      elsif ferror (File.Stream) /= 0 then
+         Raise_Device_Error (File);
+
+      elsif Nread = 0 then
+         raise End_Error;
+
+      else -- 0 < Nread < Siz
+         raise Data_Error with "not enough data read";
+      end if;
+   end Read_Buf;
+
+   procedure Read_Buf
+     (File  : AFCB_Ptr;
+      Buf   : Address;
+      Siz   : Interfaces.C_Streams.size_t;
+      Count : out Interfaces.C_Streams.size_t)
+   is
+   begin
+      Count := fread (Buf, 1, Siz, File.Stream);
+
+      if Count = 0 and then ferror (File.Stream) /= 0 then
+         Raise_Device_Error (File);
+      end if;
+   end Read_Buf;
+
+   -----------
+   -- Reset --
+   -----------
+
+   --  The reset which does not change the mode simply does a rewind
+
+   procedure Reset (File_Ptr : access AFCB_Ptr) is
+      File : AFCB_Ptr renames File_Ptr.all;
+   begin
+      Check_File_Open (File);
+      Reset (File_Ptr, File.Mode);
+   end Reset;
+
+   --  The reset with a change in mode is done using freopen, and is not
+   --  permitted except for regular files (since otherwise there is no name for
+   --  the freopen, and in any case it seems meaningless).
+
+   procedure Reset (File_Ptr : access AFCB_Ptr; Mode : File_Mode) is
+      File   : AFCB_Ptr renames File_Ptr.all;
+      Fopstr : aliased Fopen_String;
+
+   begin
+      Check_File_Open (File);
+
+      --  Change of mode not allowed for shared file or file with no name or
+      --  file that is not a regular file, or for a system file. Note that we
+      --  allow the "change" of mode if it is not in fact doing a change.
+
+      if Mode /= File.Mode then
+         if File.Shared_Status = Yes then
+            raise Use_Error with "cannot change mode of shared file";
+         elsif File.Name'Length <= 1 then
+            raise Use_Error with "cannot change mode of temp file";
+         elsif File.Is_System_File then
+            raise Use_Error with "cannot change mode of system file";
+         elsif not File.Is_Regular_File then
+            raise Use_Error with "cannot change mode of non-regular file";
+         end if;
+      end if;
+
+      --  For In_File or Inout_File for a regular file, we can just do a rewind
+      --  if the mode is unchanged, which is more efficient than doing a full
+      --  reopen.
+
+      if Mode = File.Mode
+        and then Mode in Read_File_Mode
+      then
+         rewind (File.Stream);
+
+      --  Here the change of mode is permitted, we do it by reopening the file
+      --  in the new mode and replacing the stream with a new stream.
+
+      else
+         Fopen_Mode
+           (Namestr => File.Name.all,
+            Mode    => Mode,
+            Text    => File.Text_Encoding in Text_Content_Encoding,
+            Creat   => False,
+            Amethod => File.Access_Method,
+            Fopstr  => Fopstr);
+
+         File.Stream := freopen
+           (File.Name.all'Address, Fopstr'Address, File.Stream,
+            File.Encoding);
+
+         if File.Stream = NULL_Stream then
+            Close (File_Ptr);
+            raise Use_Error;
+         else
+            File.Mode := Mode;
+            Append_Set (File);
+         end if;
+      end if;
+   end Reset;
+
+   ---------------
+   -- Write_Buf --
+   ---------------
+
+   procedure Write_Buf (File : AFCB_Ptr; Buf : Address; Siz : size_t) is
+   begin
+      --  Note: for most purposes, the Siz and 1 parameters in the fwrite call
+      --  could be reversed, but we have encountered systems where this is a
+      --  better choice, since for some file formats, reversing the parameters
+      --  results in records of one byte each.
+
+      SSL.Abort_Defer.all;
+
+      if fwrite (Buf, Siz, 1, File.Stream) /= 1 then
+         if Siz /= 0 then
+            SSL.Abort_Undefer.all;
+            Raise_Device_Error (File);
+         end if;
+      end if;
+
+      SSL.Abort_Undefer.all;
+   end Write_Buf;
+
+end System.File_IO;