osint.adb (Read_Default_Search_Dirs): correctly detect relative pathnames in…

osint.adb (Read_Default_Search_Dirs): correctly detect relative pathnames in UNIX and DOS style with drive letter.

	* osint.adb (Read_Default_Search_Dirs): correctly detect relative
        pathnames in UNIX and DOS style with drive letter.
	(Is_Relative): new routine.

	* osint.adb: Minor reformatting

	* osint.adb (Is_Relative): implementation using
        GNAT.OS_Lib.Is_Absolute_Path. Better fix for 8121-009.

From-SVN: r46503

gcc/ada/ChangeLog

 2001-10-25  Pascal Obry <obry@gnat.com>
 
+	* osint.adb (Read_Default_Search_Dirs): correctly detect relative 
+        pathnames in UNIX and DOS style with drive letter.
+	(Is_Relative): new routine.
+	
+	* osint.adb: Minor reformatting
+	
+	* osint.adb (Is_Relative): implementation using 
+        GNAT.OS_Lib.Is_Absolute_Path. Better fix for 8121-009.
+
+2001-10-25  Pascal Obry <obry@gnat.com>
+
 	* g-dirope.adb (Basename): correctly compute offset between the 
         original Path and the translated one.
 	

gcc/ada/osint.adb

@@ -6,7 +6,7 @@
 --                                                                          --
 --                                 B o d y                                  --
 --                                                                          --
---                            $Revision: 1.258 $
+--                            $Revision$
 --                                                                          --
 --          Copyright (C) 1992-2001 Free Software Foundation, Inc.          --
 --                                                                          --
@@ -1676,11 +1676,31 @@ package body Osint is
    ------------------------------
 
    function Read_Default_Search_Dirs
-     (Search_Dir_Prefix : String_Access;
-      Search_File : String_Access;
+     (Search_Dir_Prefix       : String_Access;
+      Search_File             : String_Access;
       Search_Dir_Default_Name : String_Access)
-     return String_Access
+      return                  String_Access
    is
+      function Is_Relative (S : String; K : Positive) return Boolean;
+      --  Returns True if a relative directory specification is found in S at
+      --  position K.
+
+      function Is_Relative (S : String; K : Positive) return Boolean is
+      begin
+         return
+           not (Is_Directory_Separator (S (K)) -- Unix style absolute pathname
+
+                or else -- DOS style absolute pathname with drive letter
+
+                (S'Last > K + 2
+                    and then
+                 (S (K) in 'a' .. 'z' or else S (K) in 'A' .. 'Z')
+                    and then
+                 S (K + 1) = ':'
+                    and then
+                 Is_Directory_Separator (S (K + 2))));
+      end Is_Relative;
+
       Prefix_Len : constant Integer := Search_Dir_Prefix.all'Length;
       Buffer     : String (1 .. Prefix_Len + Search_File.all'Length + 1);
       File_FD    : File_Descriptor;
@@ -1693,8 +1713,23 @@ package body Osint is
       Prev_Was_Separator : Boolean;
       Nb_Relative_Dir    : Integer;
 
-   begin
+      function Is_Relative (S : String; K : Positive) return Boolean;
+      pragma Inline (Is_Relative);
+      --  Returns True if a relative directory specification is found
+      --  in S at position K, False otherwise.
 
+      -----------------
+      -- Is_Relative --
+      -----------------
+
+      function Is_Relative (S : String; K : Positive) return Boolean is
+      begin
+         return not Is_Absolute_Path (S (K .. S'Last));
+      end Is_Relative;
+
+   --  Start of processing for Read_Default_Search_Dirs
+
+   begin
       --  Construct a C compatible character string buffer.
 
       Buffer (1 .. Search_Dir_Prefix.all'Length)
@@ -1737,12 +1772,13 @@ package body Osint is
             S (J) := Path_Separator;
          end if;
 
-         if  S (J) = Path_Separator then
+         if S (J) = Path_Separator then
             Prev_Was_Separator := True;
          else
-            if Prev_Was_Separator and S (J) /= Directory_Separator then
+            if Prev_Was_Separator and then Is_Relative (S.all, J) then
                Nb_Relative_Dir := Nb_Relative_Dir + 1;
             end if;
+
             Prev_Was_Separator := False;
          end if;
       end loop;
@@ -1757,11 +1793,11 @@ package body Osint is
       J1 := 1;
       Prev_Was_Separator := True;
       for J in 1 .. Len + 1 loop
-         if  S (J) = Path_Separator then
+         if S (J) = Path_Separator then
             Prev_Was_Separator := True;
 
          else
-            if Prev_Was_Separator and S (J) /= Directory_Separator then
+            if Prev_Was_Separator and then Is_Relative (S.all, J) then
                S1 (J1 .. J1 + Prefix_Len) := Search_Dir_Prefix.all;
                J1 := J1 + Prefix_Len;
             end if;