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------------------------------------------------------------------------------ -- -- -- GNAT COMPILER COMPONENTS -- -- -- -- K R U N C H -- -- -- -- B o d y -- -- -- -- Copyright (C) 1992-2009, 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 Hostparm; procedure Krunch (Buffer : in out String; Len : in out Natural; Maxlen : Natural; No_Predef : Boolean; VMS_On_Target : Boolean := False) is pragma Assert (Buffer'First = 1); -- This is a documented requirement; the assert turns off index warnings B1 : Character renames Buffer (1); Curlen : Natural; Krlen : Natural; Num_Seps : Natural; Startloc : Natural; J : Natural; begin -- Deal with special predefined children cases. Startloc is the first -- location for the krunch, set to 1, except for the predefined children -- case, where it is set to 3, to start after the standard prefix. if No_Predef then Startloc := 1; Curlen := Len; Krlen := Maxlen; elsif Len >= 18 and then Buffer (1 .. 17) = "ada-wide_text_io-" then Startloc := 3; Buffer (2 .. 5) := "-wt-"; Buffer (6 .. Len - 12) := Buffer (18 .. Len); Curlen := Len - 12; Krlen := 8; elsif Len >= 23 and then Buffer (1 .. 22) = "ada-wide_wide_text_io-" then Startloc := 3; Buffer (2 .. 5) := "-zt-"; Buffer (6 .. Len - 17) := Buffer (23 .. Len); Curlen := Len - 17; Krlen := 8; elsif Len >= 4 and then Buffer (1 .. 4) = "ada-" then Startloc := 3; Buffer (2 .. Len - 2) := Buffer (4 .. Len); Curlen := Len - 2; Krlen := 8; elsif Len >= 5 and then Buffer (1 .. 5) = "gnat-" then Startloc := 3; Buffer (2 .. Len - 3) := Buffer (5 .. Len); Curlen := Len - 3; Krlen := 8; elsif Len >= 7 and then Buffer (1 .. 7) = "system-" then Startloc := 3; Buffer (2 .. Len - 5) := Buffer (7 .. Len); Curlen := Len - 5; Krlen := 8; elsif Len >= 11 and then Buffer (1 .. 11) = "interfaces-" then Startloc := 3; Buffer (2 .. Len - 9) := Buffer (11 .. Len); Curlen := Len - 9; Krlen := 8; -- For the renamings in the obsolescent section, we also force krunching -- to 8 characters, but no other special processing is required here. -- Note that text_io and calendar are already short enough anyway. elsif (Len = 9 and then Buffer (1 .. 9) = "direct_io") or else (Len = 10 and then Buffer (1 .. 10) = "interfaces") or else (Len = 13 and then Buffer (1 .. 13) = "io_exceptions") or else (Len = 12 and then Buffer (1 .. 12) = "machine_code") or else (Len = 13 and then Buffer (1 .. 13) = "sequential_io") or else (Len = 20 and then Buffer (1 .. 20) = "unchecked_conversion") or else (Len = 22 and then Buffer (1 .. 22) = "unchecked_deallocation") then Startloc := 1; Krlen := 8; Curlen := Len; -- Special case of a child unit whose parent unit is a single letter that -- is A, G, I, or S. In order to prevent confusion with krunched names -- of predefined units use a tilde rather than a minus as the second -- character of the file name. On VMS a tilde is an illegal character -- in a file name, two consecutive underlines ("__") are used instead. elsif Len > 1 and then Buffer (2) = '-' and then (B1 = 'a' or else B1 = 'g' or else B1 = 'i' or else B1 = 's') and then Len <= Maxlen then -- When VMS is the host, it is always also the target if Hostparm.OpenVMS or else VMS_On_Target then Len := Len + 1; Buffer (4 .. Len) := Buffer (3 .. Len - 1); Buffer (2) := '_'; Buffer (3) := '_'; else Buffer (2) := '~'; end if; if Len <= Maxlen then return; else -- Case of VMS when the buffer had exactly the length Maxlen and now -- has the length Maxlen + 1: krunching after "__" is needed. Startloc := 4; Curlen := Len; Krlen := Maxlen; end if; -- Normal case, not a predefined file else Startloc := 1; Curlen := Len; Krlen := Maxlen; end if; -- Immediate return if file name is short enough now if Curlen <= Krlen then Len := Curlen; return; end if; -- If string contains Wide_Wide, replace by a single z J := Startloc; while J <= Curlen - 8 loop if Buffer (J .. J + 8) = "wide_wide" and then (J = Startloc or else Buffer (J - 1) = '-' or else Buffer (J - 1) = '_') and then (J + 8 = Curlen or else Buffer (J + 9) = '-' or else Buffer (J + 9) = '_') then Buffer (J) := 'z'; Buffer (J + 1 .. Curlen - 8) := Buffer (J + 9 .. Curlen); Curlen := Curlen - 8; end if; J := J + 1; end loop; -- For now, refuse to krunch a name that contains an ESC character (wide -- character sequence) since it's too much trouble to do this right ??? for J in 1 .. Curlen loop if Buffer (J) = ASCII.ESC then return; end if; end loop; -- Count number of separators (minus signs and underscores) and for now -- replace them by spaces. We keep them around till the end to control -- the krunching process, and then we eliminate them as the last step Num_Seps := 0; for J in Startloc .. Curlen loop if Buffer (J) = '-' or else Buffer (J) = '_' then Buffer (J) := ' '; Num_Seps := Num_Seps + 1; end if; end loop; -- Now we do the one character at a time krunch till we are short enough while Curlen - Num_Seps > Krlen loop declare Long_Length : Natural := 0; Long_Last : Natural := 0; Piece_Start : Natural; Ptr : Natural; begin Ptr := Startloc; -- Loop through pieces to find longest piece while Ptr <= Curlen loop Piece_Start := Ptr; -- Loop through characters in one piece of name while Ptr <= Curlen and then Buffer (Ptr) /= ' ' loop Ptr := Ptr + 1; end loop; if Ptr - Piece_Start > Long_Length then Long_Length := Ptr - Piece_Start; Long_Last := Ptr - 1; end if; Ptr := Ptr + 1; end loop; -- Remove last character of longest piece if Long_Last < Curlen then Buffer (Long_Last .. Curlen - 1) := Buffer (Long_Last + 1 .. Curlen); end if; Curlen := Curlen - 1; end; end loop; -- Final step, remove the spaces Len := 0; for J in 1 .. Curlen loop if Buffer (J) /= ' ' then Len := Len + 1; Buffer (Len) := Buffer (J); end if; end loop; return; end Krunch;
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