+ AIX support for cwstring

o AIX-specific codepage names
   o AIX/ppc32 uses a 16 bit wchar_t
   o special support for handling cp866 on AIX: AIX only supports converting
     cp866 from/to ISO8859-5 -> always use that code page as an intermediate
     one on AIX (it's lossy, but better than completely failing)
  * in case the default system code page cannot be detected, fall back to
    UTF-8

git-svn-id: trunk@20839 -

.gitattributes

@@ -8350,6 +8350,7 @@ rtl/unix/convert.inc svneol=native#text/plain
 rtl/unix/crt.pp svneol=native#text/plain
 rtl/unix/cthreads.pp svneol=native#text/plain
 rtl/unix/ctypes.inc svneol=native#text/plain
+rtl/unix/cwstraix.inc svneol=native#text/plain
 rtl/unix/cwstring.pp svneol=native#text/plain
 rtl/unix/dl.pp svneol=native#text/plain
 rtl/unix/dos.pp svneol=native#text/plain

rtl/unix/cwstraix.inc

@@ -0,0 +1,106 @@
+{
+    This file is part of the Free Pascal run time library.
+    Copyright (c) 2012 by Jonas Maebe
+
+    Helper routines for cwstring AIX
+
+    See the file COPYING.FPC, included in this distribution,
+    for details about the copyright.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+
+ **********************************************************************}
+
+function Ansi2AnsiMove(source:pchar; fromcp:TSystemCodePage; const tocp: pchar; out dest:rawbytestring; len:SizeInt): boolean;
+  var
+    outlength,
+    outoffset,
+    outleft : size_t;
+    use_iconv: iconv_t;
+    srcpos,
+    destpos: pchar;
+    mynil : pchar;
+    my0 : size_t;
+    err: cint;
+  begin
+    use_iconv:=open_iconv_for_cps(fromcp,tocp,true);
+    { unsupported encoding -> default move }
+    if use_iconv=iconv_t(-1) then
+      exit(false);
+    mynil:=nil;
+    my0:=0;
+    // extra space
+    outlength:=len;
+    setlength(dest,outlength);
+    srcpos:=source;
+    destpos:=pchar(dest);
+    outleft:=outlength;
+    while iconv(use_iconv,@srcpos,psize(@len),@destpos,@outleft)=size_t(-1) do
+      begin
+        err:=fpgetCerrno;
+        case err of
+         ESysEINVAL,
+         ESysEILSEQ:
+            begin
+              { skip and set to '?' }
+              inc(srcpos);
+              dec(len);
+              pchar(destpos)^:='?';
+              inc(destpos,2);
+              dec(outleft,2);
+              { reset }
+              iconv(use_iconv,@mynil,@my0,@mynil,@my0);
+              if err=ESysEINVAL then
+                break;
+            end;
+          ESysE2BIG:
+            begin
+              outoffset:=destpos-pchar(dest);
+              { extend }
+              setlength(dest,outlength+len);
+              inc(outleft,len);
+              inc(outlength,len);
+              { string could have been moved }
+              destpos:=pchar(dest)+outoffset;
+            end;
+          else
+            runerror(231);
+        end;
+      end;
+    // truncate string
+    setlength(dest,length(dest)-outleft);
+    iconv_close(use_iconv);
+    result:=true;
+  end;
+
+
+function handle_aix_intermediate(source: pchar; sourcecp: TSystemCodePage; out newcp: TSystemCodePage; out str: rawbytestring; len: SizeInt): boolean;
+  begin
+    result:=false;
+    { for some reason, IBM's iconv only supports converting cp866 to/from
+      ISO8859-5. This conversion is lossy, but it's better than completely
+      failing. At least it keeps the cyrillic characters intact }
+    case sourcecp of
+      866:
+        begin
+          handle_aix_intermediate:=Ansi2AnsiMove(source,sourcecp,'ISO8859-5',str, len);
+          if handle_aix_intermediate then
+            begin
+              newcp:=28595;
+              setcodepage(str,newcp,false);
+            end;
+        end;
+      28595:
+        begin
+          handle_aix_intermediate:=Ansi2AnsiMove(source,sourcecp,'IBM-866',str, len);
+          if handle_aix_intermediate then
+            begin
+              newcp:=866;
+              setcodepage(str,newcp,false);
+            end;
+        end;
+    end;
+  end;
+

rtl/unix/cwstring.pp

@@ -129,8 +129,12 @@ const
   unicode_encoding2 = 'UTF-16LE';
   unicode_encoding4 = 'UCS-4LE';
 {$else  FPC_LITTLE_ENDIAN}
+{$ifdef AIX}
+  unicode_encoding2 = 'UTF-16';
+{$else AIX}
   unicode_encoding2 = 'UTF-16BE';
   unicode_encoding4 = 'UCS-4BE';
+{$endif AIX}
 {$endif  FPC_LITTLE_ENDIAN}
 
 { en_US.UTF-8 needs maximally 6 chars, UCS-4/UTF-32 needs 4   }
@@ -193,19 +197,24 @@ threadvar
   current_DefaultSystemCodePage: TSystemCodePage;
 
 
-  function win2iconv(cp: word): rawbytestring; forward;
-
+{$i winiconv.inc}
 
 procedure InitThread;
 var
   transliterate: cint;
+  iconvindex: longint;
 {$if not(defined(darwin) and defined(cpuarm)) and not defined(iphonesim)}
   iconvname: rawbytestring;
 {$endif}
 begin
   current_DefaultSystemCodePage:=DefaultSystemCodePage;
 {$if not(defined(darwin) and defined(cpuarm)) and not defined(iphonesim)}
-  iconvname:=win2iconv(DefaultSystemCodePage);
+  iconvindex:=win2iconv(DefaultSystemCodePage);
+  if iconvindex<>-1 then
+    iconvname:=win2iconv_arr[iconvindex].name
+  else
+    { default to UTF-8 on Unix platforms }
+    iconvname:='UTF-8';
   iconv_wide2ansi:=iconv_open(pchar(iconvname),unicode_encoding2);
   iconv_ansi2wide:=iconv_open(unicode_encoding2,pchar(iconvname));
 {$else}
@@ -231,9 +240,6 @@ begin
 end;
 
 
-{$i winiconv.inc}
-
-
 {$if defined(beos) and not defined(haiku)}
 function nl_langinfo(__item:nl_item):pchar;
 begin
@@ -250,6 +256,37 @@ begin
 end;
 {$endif}
 
+
+function open_iconv_for_cps(cp: TSystemCodePage; const otherencoding: pchar; cp_is_from: boolean): iconv_t;
+  var
+    iconvindex: longint;
+  begin
+    { TODO: add caching (then we also don't need separate code for
+      the default system page and other ones)
+
+      -- typecasting an ansistring function result to pchar is
+        unsafe normally, but these are constant strings -> no
+        problem }
+    open_iconv_for_cps:=iconv_t(-1);
+    iconvindex:=win2iconv(cp);
+    if iconvindex=-1 then
+      exit;
+    repeat
+      if cp_is_from then
+        open_iconv_for_cps:=iconv_open(otherencoding,pchar(win2iconv_arr[iconvindex].name))
+      else
+        open_iconv_for_cps:=iconv_open(pchar(win2iconv_arr[iconvindex].name),otherencoding);
+      inc(iconvindex);
+    until (open_iconv_for_cps<>iconv_t(-1)) or
+          (iconvindex>high(win2iconv_arr)) or
+          (win2iconv_arr[iconvindex].cp<>cp);
+  end;
+
+
+{$ifdef aix}
+{$i cwstraix.inc}
+{$endif aix}
+
 procedure Wide2AnsiMove(source:pwidechar; var dest:RawByteString; cp:TSystemCodePage; len:SizeInt);
   var
     outlength,
@@ -261,10 +298,23 @@ procedure Wide2AnsiMove(source:pwidechar; var dest:RawByteString; cp:TSystemCode
     destpos: pchar;
     mynil : pchar;
     my0 : size_t;
-    err,
+    err : longint;
     transliterate: cint;
     free_iconv: boolean;
+{$ifdef aix}
+    intermediate: rawbytestring;
+{$endif aix}
   begin
+{$ifdef aix}
+    { AIX libiconv does not support converting cp866 to anything else except
+      for iso-8859-5 -> always first convert to iso-8859-5, then to UTF-16 }
+    if cp=866 then
+      begin
+        Wide2AnsiMove(source,intermediate,28595,len);
+        if handle_aix_intermediate(pchar(intermediate),28595,cp,dest,len) then
+          exit;
+      end;
+{$endif aix}
     if (cp=DefaultSystemCodePage) then
       begin
         { update iconv converter in case the DefaultSystemCodePage has been
@@ -279,14 +329,9 @@ procedure Wide2AnsiMove(source:pwidechar; var dest:RawByteString; cp:TSystemCode
       end
     else
       begin
-        { TODO: add caching (then we also don't need separate code for
-          the default system page and other ones)
-
-          -- typecasting an ansistring function result to pchar is
-            unsafe normally, but these are constant strings -> no
-            problem }
-        use_iconv:=iconv_open(pchar(win2iconv(cp)),unicode_encoding2);
-        if assigned(iconvctl) then
+        use_iconv:=open_iconv_for_cps(cp,unicode_encoding2,false);
+        if (use_iconv<>iconv_t(-1)) and
+           assigned(iconvctl) then
         begin
           transliterate:=1;
           iconvctl(use_iconv,ICONV_SET_TRANSLITERATE,@transliterate);
@@ -361,8 +406,21 @@ procedure Ansi2WideMove(source:pchar; cp:TSystemCodePage; var dest:widestring; l
     mynil : pchar;
     my0 : size_t;
     err: cint;
+    iconvindex: longint;
     free_iconv: boolean;
+{$ifdef aix}
+    intermediate: rawbytestring;
+{$endif aix}
   begin
+{$ifdef aix}
+    { AIX libiconv does not support converting cp866 to anything else except
+      for iso-8859-5 -> always first convert to iso-8859-5, then to UTF-16 }
+    if cp=866 then
+      begin
+        if handle_aix_intermediate(source,cp,cp,intermediate,len) then
+          source:=pchar(intermediate);
+      end;
+{$endif aix}
     if (cp=DefaultSystemCodePage) then
       begin
         { update iconv converter in case the DefaultSystemCodePage has been
@@ -383,7 +441,7 @@ procedure Ansi2WideMove(source:pchar; cp:TSystemCodePage; var dest:widestring; l
           -- typecasting an ansistring function result to pchar is
             unsafe normally, but these are constant strings -> no
             problem }
-        use_iconv:=iconv_open(unicode_encoding2,pchar(win2iconv(cp)));
+        use_iconv:=open_iconv_for_cps(cp,unicode_encoding2,true);
         free_iconv:=true;
       end;
     { unsupported encoding -> default move }
@@ -682,6 +740,7 @@ function WideStringToUCS4StringNoNulls(const s : WideString) : UCS4String;
 
 
 function CompareWideString(const s1, s2 : WideString) : PtrInt;
+{$if not(defined (aix) and defined(cpupowerpc32))}
   var
     hs1,hs2 : UCS4String;
   begin
@@ -690,6 +749,32 @@ function CompareWideString(const s1, s2 : WideString) : PtrInt;
     hs2:=WideStringToUCS4StringNoNulls(s2);
     result:=wcscoll(pwchar_t(hs1),pwchar_t(hs2));
   end;
+{$else}
+  { AIX/PPC32 has a 16 bit wchar_t }
+  var
+    i, len: longint;
+    hs1, hs2: array of widechar;
+  begin
+    len:=length(s1);
+    setlength(hs1,len+1);
+    for i:=1 to len do
+      if s1[i]<>#0 then
+        hs1[i-1]:=s1[i]
+      else
+        hs1[i-1]:=#32;
+    hs1[len]:=#0;
+
+    len:=length(s2);
+    setlength(hs2,len+1);
+    for i:=1 to len do
+      if s2[i]<>#0 then
+        hs2[i-1]:=s2[i]
+      else
+        hs2[i-1]:=#32;
+    hs2[len]:=#0;
+    result:=wcscoll(pwchar_t(hs1),pwchar_t(hs2));
+  end;
+{$endif}
 
 
 function CompareTextWideString(const s1, s2 : WideString): PtrInt;
@@ -728,7 +813,6 @@ function CharLengthPChar(const Str: PChar): PtrInt;
 
 function CodePointLength(const Str: PChar; maxlookahead: ptrint): PtrInt;
   var
-    nextlen: ptrint;
 {$ifndef beos}
     mbstate: mbstate_t;
 {$endif not beos}