From: Pascal Obry Date: Thu, 11 Jan 2018 08:52:39 +0000 (+0000) Subject: [Ada] New implementation for Normalize_Pathname X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=7d1553e2b65506288b554e948856e9330cee3e5f;p=gcc.git [Ada] New implementation for Normalize_Pathname This implementation fixes an issue on Windows where a single drive letter was not followed by a directory separator. On Windows the following program: with Ada.Text_IO; use Ada.Text_IO; with GNAT.OS_Lib; use GNAT.OS_Lib; procedure Main is begin Put_Line (Normalize_Pathname ("c:\")); Put_Line (Normalize_Pathname ("c:\toto\..")); end Main; Must output: C:\ C:\ 2018-01-11 Pascal Obry gcc/ada/ * libgnat/s-os_lib.adb (Normalize_Pathname): New implementation. From-SVN: r256501 --- diff --git a/gcc/ada/ChangeLog b/gcc/ada/ChangeLog index 4a92bf96d03..af01944f740 100644 --- a/gcc/ada/ChangeLog +++ b/gcc/ada/ChangeLog @@ -1,3 +1,7 @@ +2018-01-11 Pascal Obry + + * libgnat/s-os_lib.adb (Normalize_Pathname): New implementation. + 2018-01-11 Bob Duff * doc/gnat_ugn/gnat_utility_programs.rst: Rewrite gnatpp documentation diff --git a/gcc/ada/libgnat/s-os_lib.adb b/gcc/ada/libgnat/s-os_lib.adb index da357e78ddb..94618343dcf 100644 --- a/gcc/ada/libgnat/s-os_lib.adb +++ b/gcc/ada/libgnat/s-os_lib.adb @@ -2085,12 +2085,6 @@ package body System.OS_Lib is Bufsiz : size_t) return Integer; pragma Import (C, Readlink, "__gnat_readlink"); - function To_Canonical_File_Spec - (Host_File : System.Address) return System.Address; - pragma Import - (C, To_Canonical_File_Spec, "__gnat_to_canonical_file_spec"); - -- Convert possible foreign file syntax to canonical form - Fold_To_Lower_Case : constant Boolean := not Case_Sensitive and then Get_File_Names_Case_Sensitive = 0; @@ -2142,7 +2136,18 @@ package body System.OS_Lib is end if; end if; - return S1 (1 .. Last); + -- And ensure that there is a trailing directory separator if the + -- path contains only a drive letter. + + if On_Windows + and then Last = 2 + and then S1 (1) /= Directory_Separator + and then S1 (2) = ':' + then + return S1 (1 .. Last) & Directory_Separator; + else + return S1 (1 .. Last); + end if; end Final_Value; ------------------- @@ -2157,8 +2162,8 @@ package body System.OS_Lib is declare Result : String := Normalize_Pathname - (Dir, "", Resolve_Links, Case_Sensitive) & - Directory_Separator; + (Dir, "", Resolve_Links, Case_Sensitive) + & Directory_Separator; Last : Positive := Result'Last - 1; begin @@ -2218,112 +2223,85 @@ package body System.OS_Lib is Max_Iterations : constant := 500; - Canonical_File_Addr : System.Address; - Canonical_File_Len : Integer; + Cur_Dir : constant String := Get_Directory (Directory); + Cur_Dir_Len : constant Natural := Cur_Dir'Length; - End_Path : Natural := 0; - Finish : Positive; - Last : Positive; + End_Path : Natural := Name'Length; + Last : Positive := 1; Link_Buffer : String (1 .. Max_Path + 2); - Path_Buffer : String (1 .. Max_Path + Max_Path + 2); - Start : Natural; - Status : Integer; - The_Name : String (1 .. Name'Length + 1); + Path_Buffer : String (1 .. End_Path + Cur_Dir_Len + Max_Path + 2); + -- We need to potentially store in this buffer the following elements: + -- the path itself, the current directory if the path is relative, + -- and additional fragments up to Max_Path in length in case + -- there are any symlinks. + Start, Finish : Positive; + Status : Integer; -- Start of processing for Normalize_Pathname begin - -- Special case, return null if name is null, or if it is bigger than - -- the biggest name allowed. + -- Special case, return null if name is null - if Name'Length = 0 or else Name'Length > Max_Path then + if End_Path = 0 then return ""; end if; - -- First, convert possible foreign file spec to Unix file spec. If no - -- conversion is required, all this does is put Name at the beginning - -- of Path_Buffer unchanged. - - File_Name_Conversion : begin - The_Name (1 .. Name'Length) := Name; - The_Name (The_Name'Last) := ASCII.NUL; - - Canonical_File_Addr := To_Canonical_File_Spec (The_Name'Address); - Canonical_File_Len := Integer (CRTL.strlen (Canonical_File_Addr)); + if Is_Absolute_Path (Name) then + Path_Buffer (1 .. End_Path) := Name; - -- If syntax conversion has failed, return an empty string to - -- indicate the failure. - - if Canonical_File_Len = 0 then - return ""; - end if; + else + -- If this is a relative pathname, prepend current directory + Path_Buffer (1 .. Cur_Dir_Len) := Cur_Dir; + Path_Buffer (Cur_Dir_Len + 1 .. Cur_Dir_Len + End_Path) := Name; + End_Path := Cur_Dir_Len + End_Path; + Last := Cur_Dir_Len; + end if; - declare - subtype Path_String is String (1 .. Canonical_File_Len); - Canonical_File : Path_String; - for Canonical_File'Address use Canonical_File_Addr; - pragma Import (Ada, Canonical_File); + -- Special handling for Windows: + -- * Replace all '/' by '\' + -- * Check the drive letter + -- * Remove all double-quotes - begin - Path_Buffer (1 .. Canonical_File_Len) := Canonical_File; - End_Path := Canonical_File_Len; - Last := 1; - end; - end File_Name_Conversion; + if On_Windows then - -- Replace all '/' by Directory Separators (this is for Windows) + -- Replace all '/' by '\' - if Directory_Separator /= '/' then for Index in 1 .. End_Path loop if Path_Buffer (Index) = '/' then Path_Buffer (Index) := Directory_Separator; end if; end loop; - end if; - - -- Resolve directory names for Windows - - if On_Windows then - -- On Windows, if we have an absolute path starting with a directory - -- separator, we need to have the drive letter appended in front. - - -- On Windows, Get_Current_Dir will return a suitable directory name - -- (path starting with a drive letter on Windows). So we take this - -- drive letter and prepend it to the current path. + -- If we have an absolute path starting with a directory + -- separator (but not a UNC path), we need to have the drive letter + -- in front of the path. Get_Current_Dir returns a path starting + -- with a drive letter. So we take this drive letter and prepend it + -- to the current path. if Path_Buffer (1) = Directory_Separator and then Path_Buffer (2) /= Directory_Separator then - declare - Cur_Dir : constant String := Get_Directory (""); - -- Get the current directory to get the drive letter - - begin - if Cur_Dir'Length > 2 - and then Cur_Dir (Cur_Dir'First + 1) = ':' - then - Path_Buffer (3 .. End_Path + 2) := - Path_Buffer (1 .. End_Path); - Path_Buffer (1 .. 2) := - Cur_Dir (Cur_Dir'First .. Cur_Dir'First + 1); - End_Path := End_Path + 2; - end if; - end; + if Cur_Dir'Length > 2 + and then Cur_Dir (Cur_Dir'First + 1) = ':' + then + Path_Buffer (3 .. End_Path + 2) := + Path_Buffer (1 .. End_Path); + Path_Buffer (1 .. 2) := + Cur_Dir (Cur_Dir'First .. Cur_Dir'First + 1); + End_Path := End_Path + 2; + end if; - -- We have a drive letter, ensure it is upper-case + -- We have a drive letter already, ensure it is upper-case elsif Path_Buffer (1) in 'a' .. 'z' and then Path_Buffer (2) = ':' then System.Case_Util.To_Upper (Path_Buffer (1 .. 1)); end if; - end if; - -- On Windows, remove all double-quotes that are possibly part of the - -- path but can cause problems with other methods. + -- Remove all double-quotes that are possibly part of the + -- path but can cause problems with other methods. - if On_Windows then declare Index : Natural; @@ -2347,30 +2325,10 @@ package body System.OS_Lib is for J in 1 .. Max_Iterations loop - -- If we don't have an absolute pathname, prepend the directory - -- Reference_Dir. - - if Last = 1 - and then not Is_Absolute_Path (Path_Buffer (1 .. End_Path)) - then - declare - Reference_Dir : constant String := Get_Directory (Directory); - Ref_Dir_Len : constant Natural := Reference_Dir'Length; - -- Current directory name specified and its length - - begin - Path_Buffer (Ref_Dir_Len + 1 .. Ref_Dir_Len + End_Path) := - Path_Buffer (1 .. End_Path); - End_Path := Ref_Dir_Len + End_Path; - Path_Buffer (1 .. Ref_Dir_Len) := Reference_Dir; - Last := Ref_Dir_Len; - end; - end if; - Start := Last + 1; Finish := Last; - -- Ensure that Windows network drives are kept, e.g: \\server\drive-c + -- Ensure that Windows UNC path is preserved, e.g: \\server\drive-c if Start = 2 and then Directory_Separator = '\' @@ -2434,11 +2392,11 @@ package body System.OS_Lib is Start := Last; loop Start := Start - 1; - exit when Start < 1 + exit when Start = 1 or else Path_Buffer (Start) = Directory_Separator; end loop; - if Start <= 1 then + if Start = 1 then if Finish = End_Path then return (1 => Directory_Separator);