1------------------------------------------------------------------------------
2--                                                                          --
3--                         GNAT COMPILER COMPONENTS                         --
4--                                                                          --
5--                               G N A T K R                                --
6--                                                                          --
7--                                 B o d y                                  --
8--                                                                          --
9--          Copyright (C) 1992-2007, Free Software Foundation, Inc.         --
10--                                                                          --
11-- GNAT is free software;  you can  redistribute it  and/or modify it under --
12-- terms of the  GNU General Public License as published  by the Free Soft- --
13-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
14-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
15-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
16-- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
17-- for  more details.  You should have  received  a copy of the GNU General --
18-- Public License  distributed with GNAT; see file COPYING3.  If not, go to --
19-- http://www.gnu.org/licenses for a complete copy of the license.          --
20--                                                                          --
21-- GNAT was originally developed  by the GNAT team at  New York University. --
22-- Extensive contributions were provided by Ada Core Technologies Inc.      --
23--                                                                          --
24------------------------------------------------------------------------------
25
26with Ada.Characters.Handling; use Ada.Characters.Handling;
27with Ada.Command_Line;        use Ada.Command_Line;
28with Gnatvsn;
29with Krunch;
30with System.IO; use System.IO;
31
32procedure Gnatkr is
33   pragma Ident (Gnatvsn.Gnat_Static_Version_String);
34
35   Count        : Natural;
36   Maxlen       : Integer;
37   Exit_Program : exception;
38
39   function Get_Maximum_File_Name_Length return Integer;
40   pragma Import (C, Get_Maximum_File_Name_Length,
41                 "__gnat_get_maximum_file_name_length");
42
43begin
44   Count := Argument_Count;
45
46   if Count < 1 or else Count > 2 then
47      Put_Line ("Usage: gnatkr  filename[.extension]  [krunch-count]");
48      raise Exit_Program;
49
50   else
51      --  If the length (krunch-count) argument is omitted use the system
52      --  default if there is one, otherwise use 8.
53
54      if Count = 1 then
55         Maxlen := Get_Maximum_File_Name_Length;
56
57         if Maxlen = -1 then
58            Maxlen := 8;
59         end if;
60
61      else
62         Maxlen := 0;
63
64         for J in Argument (2)'Range loop
65            if Argument (2) (J) /= ' ' then
66               if Argument (2) (J) not in '0' .. '9' then
67                  Put_Line ("Illegal argument for krunch-count");
68                  raise Exit_Program;
69               else
70                  Maxlen := Maxlen * 10 +
71                    Character'Pos (Argument (2) (J)) - Character'Pos ('0');
72               end if;
73            end if;
74         end loop;
75
76         --  Zero means crunch only system files
77
78         if Maxlen = 0 then
79            Maxlen := Natural'Last;
80         end if;
81
82      end if;
83
84      declare
85         Fname : String  := Argument (1);
86         Klen  : Natural := Fname'Length;
87
88         Extp : Boolean := False;
89         --  True if extension is present
90
91         Ext : Natural := 0;
92         --  If extension is present, points to it (init to prevent warning)
93
94      begin
95         --  Remove extension if present (an extension is defined as the
96         --  section of the file name after the last dot in the name. If
97         --  there is no dot in the name, then
98         --  name is all lower case and contains no other instances of dots)
99
100         for J in reverse 1 .. Klen loop
101            if Fname (J) = '.' then
102               Extp := True;
103               Ext := J;
104               Klen := J - 1;
105               exit;
106            end if;
107         end loop;
108
109         --  Fold to lower case and replace dots by dashes
110
111         for J in 1 .. Klen loop
112            Fname (J) := To_Lower (Fname (J));
113
114            if Fname (J) = '.' then
115               Fname (J) := '-';
116            end if;
117         end loop;
118
119         Krunch (Fname, Klen, Maxlen, False);
120
121         Put (Fname (1 .. Klen));
122
123         if Extp then
124            Put (Fname (Ext .. Fname'Length));
125         end if;
126
127         New_Line;
128      end;
129   end if;
130
131   Set_Exit_Status (Success);
132
133exception
134   when Exit_Program =>
135      Set_Exit_Status (Failure);
136
137end Gnatkr;
138