git://gcc.gnu.org / gcc.git / blame
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1 | ------------------------------------------------------------------------------ |
| 2 | -- -- | |
| 3 | -- GNAT COMPILER COMPONENTS -- | |
| 4 | -- -- | |
| 5 | -- S W I T C H -- | |
| 6 | -- -- | |
| 7 | -- B o d y -- | |
| 8 | -- -- | |
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9 | -- Copyright (C) 1992-2001, 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 2, 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 COPYING. If not, write -- | |
| 19 | -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, -- | |
| 20 | -- MA 02111-1307, USA. -- | |
| 21 | -- -- | |
| 22 | -- GNAT was originally developed by the GNAT team at New York University. -- | |
| 71ff80dc | 23 | -- Extensive contributions were provided by Ada Core Technologies Inc. -- |
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24 | -- -- |
| 25 | ------------------------------------------------------------------------------ | |
| 26 | ||
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27 | package body Switch is |
| 28 | ||
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29 | ------------------------- |
| 30 | -- Is_Front_End_Switch -- | |
| 31 | ------------------------- | |
| 32 | ||
| 33 | function Is_Front_End_Switch (Switch_Chars : String) return Boolean is | |
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34 | Ptr : constant Positive := Switch_Chars'First; |
| 35 | ||
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36 | begin |
| 37 | return Is_Switch (Switch_Chars) | |
| 38 | and then | |
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39 | (Switch_Chars (Ptr + 1) = 'I' |
| 40 | or else (Switch_Chars'Length >= 5 | |
| 41 | and then Switch_Chars (Ptr + 1 .. Ptr + 4) = "gnat") | |
| 42 | or else (Switch_Chars'Length >= 5 | |
| 43 | and then Switch_Chars (Ptr + 1 .. Ptr + 4) = "fRTS")); | |
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44 | end Is_Front_End_Switch; |
| 45 | ||
| 46 | --------------- | |
| 47 | -- Is_Switch -- | |
| 48 | --------------- | |
| 49 | ||
| 50 | function Is_Switch (Switch_Chars : String) return Boolean is | |
| 51 | begin | |
| 52 | return Switch_Chars'Length > 1 | |
| 07fc65c4 | 53 | and then Switch_Chars (Switch_Chars'First) = '-'; |
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54 | end Is_Switch; |
| 55 | ||
| 996ae0b0 | 56 | ------------------------ |
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57 | -------------- |
| 58 | -- Scan_Nat -- | |
| 59 | -------------- | |
| 60 | ||
| 61 | procedure Scan_Nat | |
| 62 | (Switch_Chars : String; | |
| 63 | Max : Integer; | |
| 64 | Ptr : in out Integer; | |
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65 | Result : out Nat) |
| 66 | is | |
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67 | begin |
| 68 | Result := 0; | |
| 07fc65c4 | 69 | |
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70 | if Ptr > Max or else Switch_Chars (Ptr) not in '0' .. '9' then |
| 71 | raise Missing_Switch_Value; | |
| 72 | end if; | |
| 73 | ||
| 74 | while Ptr <= Max and then Switch_Chars (Ptr) in '0' .. '9' loop | |
| 75 | Result := Result * 10 + | |
| 76 | Character'Pos (Switch_Chars (Ptr)) - Character'Pos ('0'); | |
| 77 | Ptr := Ptr + 1; | |
| 78 | ||
| 79 | if Result > Switch_Max_Value then | |
| 80 | raise Bad_Switch_Value; | |
| 81 | end if; | |
| 82 | end loop; | |
| 83 | end Scan_Nat; | |
| 84 | ||
| 85 | -------------- | |
| 86 | -- Scan_Pos -- | |
| 87 | -------------- | |
| 88 | ||
| 89 | procedure Scan_Pos | |
| 90 | (Switch_Chars : String; | |
| 91 | Max : Integer; | |
| 92 | Ptr : in out Integer; | |
| 93 | Result : out Pos) is | |
| 94 | ||
| 95 | begin | |
| 96 | Scan_Nat (Switch_Chars, Max, Ptr, Result); | |
| 07fc65c4 | 97 | |
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98 | if Result = 0 then |
| 99 | raise Bad_Switch_Value; | |
| 100 | end if; | |
| 101 | end Scan_Pos; | |
| 102 | ||
| 103 | end Switch; |