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------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- K R U N C H --
-- --
-- B o d y --
-- --
-- Copyright (C) 1992-2007, 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 2, 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. See the GNU General Public License --
-- for more details. You should have received a copy of the GNU General --
-- Public License distributed with GNAT; see file COPYING. If not, write --
-- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
-- Boston, MA 02110-1301, USA. --
-- --
-- As a special exception, if other files instantiate generics from this --
-- unit, or you link this unit with other files to produce an executable, --
-- this unit does not by itself cause the resulting executable to be --
-- covered by the GNU General Public License. This exception does not --
-- however invalidate any other reasons why the executable file might be --
-- covered by the GNU Public License. --
-- --
-- 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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