1------------------------------------------------------------------------------
2--                                                                          --
3--                         GNAT COMPILER COMPONENTS                         --
4--                                                                          --
5--                               G N A T K R                                --
6--                                                                          --
7--                                 B o d y                                  --
8--                                                                          --
9--          Copyright (C) 1992-2013, 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 Gnatvsn;
27with Krunch;
28with Switch;  use Switch;
29
30with Ada.Characters.Handling; use Ada.Characters.Handling;
31with Ada.Command_Line;        use Ada.Command_Line;
32
33with System.IO; use System.IO;
34
35procedure Gnatkr is
36   pragma Ident (Gnatvsn.Gnat_Static_Version_String);
37
38   Count        : Natural;
39   Maxlen       : Integer;
40   Exit_Program : exception;
41
42   function Get_Maximum_File_Name_Length return Integer;
43   pragma Import (C, Get_Maximum_File_Name_Length,
44                  "__gnat_get_maximum_file_name_length");
45
46   procedure Usage;
47   --  Output usage information
48
49   -----------
50   -- Usage --
51   -----------
52
53   procedure Usage is
54   begin
55      Put_Line ("Usage: gnatkr  filename[.extension]  [krunch-count]");
56   end Usage;
57
58   procedure Check_Version_And_Help is new Check_Version_And_Help_G (Usage);
59
60begin
61   Check_Version_And_Help ("GNATKR", "1992");
62   Count := Argument_Count;
63
64   if Count < 1 or else Count > 2 then
65      Usage;
66      raise Exit_Program;
67
68   else
69      --  If the length (krunch-count) argument is omitted use the system
70      --  default if there is one, otherwise use 8.
71
72      if Count = 1 then
73         Maxlen := Get_Maximum_File_Name_Length;
74
75         if Maxlen = -1 then
76            Maxlen := 8;
77         end if;
78
79      else
80         Maxlen := 0;
81
82         for J in Argument (2)'Range loop
83            if Argument (2) (J) /= ' ' then
84               if Argument (2) (J) not in '0' .. '9' then
85                  Put_Line ("Illegal argument for krunch-count");
86                  raise Exit_Program;
87               else
88                  Maxlen := Maxlen * 10 +
89                    Character'Pos (Argument (2) (J)) - Character'Pos ('0');
90               end if;
91            end if;
92         end loop;
93
94         --  Zero means crunch only system files
95
96         if Maxlen = 0 then
97            Maxlen := Natural'Last;
98         end if;
99
100      end if;
101
102      declare
103         Fname : String  := Argument (1);
104         Klen  : Natural := Fname'Length;
105
106         Extp : Boolean := False;
107         --  True if extension is present
108
109         Ext : Natural := 0;
110         --  If extension is present, points to it (init to prevent warning)
111
112      begin
113         --  Remove extension if present (an extension is defined as the
114         --  section of the file name after the last dot in the name. If
115         --  there is no dot in the name, then
116         --  name is all lower case and contains no other instances of dots)
117
118         for J in reverse 1 .. Klen loop
119            if Fname (J) = '.' then
120               Extp := True;
121               Ext := J;
122               Klen := J - 1;
123               exit;
124            end if;
125         end loop;
126
127         --  Fold to lower case and replace dots by dashes
128
129         for J in 1 .. Klen loop
130            Fname (J) := To_Lower (Fname (J));
131
132            if Fname (J) = '.' then
133               Fname (J) := '-';
134            end if;
135         end loop;
136
137         Krunch (Fname, Klen, Maxlen, False);
138
139         Put (Fname (1 .. Klen));
140
141         if Extp then
142            Put (Fname (Ext .. Fname'Length));
143         end if;
144
145         New_Line;
146      end;
147   end if;
148
149   Set_Exit_Status (Success);
150
151exception
152   when Exit_Program =>
153      Set_Exit_Status (Failure);
154
155end Gnatkr;
156