projects / thirdparty / gcc.git / blame
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| 1eee94d3 GM |
1 | (* StdIO.def provides general Read and Write procedures. |
| 2 | ||
| 83ffe9cd | 3 | Copyright (C) 2001-2023 Free Software Foundation, Inc. |
| 1eee94d3 GM |
4 | Contributed by Gaius Mulley <gaius.mulley@southwales.ac.uk>. |
| 5 | ||
| 6 | This file is part of GNU Modula-2. | |
| 7 | ||
| 8 | GNU Modula-2 is free software; you can redistribute it and/or modify | |
| 9 | it under the terms of the GNU General Public License as published by | |
| 10 | the Free Software Foundation; either version 3, or (at your option) | |
| 11 | any later version. | |
| 12 | ||
| 13 | GNU Modula-2 is distributed in the hope that it will be useful, but | |
| 14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 16 | General Public License for more details. | |
| 17 | ||
| 18 | Under Section 7 of GPL version 3, you are granted additional | |
| 19 | permissions described in the GCC Runtime Library Exception, version | |
| 20 | 3.1, as published by the Free Software Foundation. | |
| 21 | ||
| 22 | You should have received a copy of the GNU General Public License and | |
| 23 | a copy of the GCC Runtime Library Exception along with this program; | |
| 24 | see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
| 25 | <http://www.gnu.org/licenses/>. *) | |
| 26 | ||
| 27 | DEFINITION MODULE StdIO ; | |
| 28 | ||
| 29 | EXPORT QUALIFIED ProcRead, ProcWrite, | |
| 30 | Read, Write, | |
| 31 | PushOutput, PopOutput, GetCurrentOutput, | |
| 32 | PushInput, PopInput, GetCurrentInput ; | |
| 33 | ||
| 34 | ||
| 35 | TYPE | |
| 36 | ProcWrite = PROCEDURE (CHAR) ; | |
| 37 | ProcRead = PROCEDURE (VAR CHAR) ; | |
| 38 | ||
| 39 | ||
| 40 | (* | |
| 41 | Read - is the generic procedure that all higher application layers | |
| 42 | should use to receive a character. | |
| 43 | *) | |
| 44 | ||
| 45 | PROCEDURE Read (VAR ch: CHAR) ; | |
| 46 | ||
| 47 | ||
| 48 | (* | |
| 49 | Write - is the generic procedure that all higher application layers | |
| 50 | should use to emit a character. | |
| 51 | *) | |
| 52 | ||
| 53 | PROCEDURE Write (ch: CHAR) ; | |
| 54 | ||
| 55 | ||
| 56 | (* | |
| 57 | PushOutput - pushes the current Write procedure onto a stack, | |
| 58 | any future references to Write will actually invoke | |
| 59 | procedure, p. | |
| 60 | *) | |
| 61 | ||
| 62 | PROCEDURE PushOutput (p: ProcWrite) ; | |
| 63 | ||
| 64 | ||
| 65 | (* | |
| 66 | PopOutput - restores Write to use the previous output procedure. | |
| 67 | *) | |
| 68 | ||
| 69 | PROCEDURE PopOutput ; | |
| 70 | ||
| 71 | ||
| 72 | (* | |
| 73 | GetCurrentOutput - returns the current output procedure. | |
| 74 | *) | |
| 75 | ||
| 76 | PROCEDURE GetCurrentOutput () : ProcWrite ; | |
| 77 | ||
| 78 | ||
| 79 | (* | |
| 80 | PushInput - pushes the current Read procedure onto a stack, | |
| 81 | any future references to Read will actually invoke | |
| 82 | procedure, p. | |
| 83 | *) | |
| 84 | ||
| 85 | PROCEDURE PushInput (p: ProcRead) ; | |
| 86 | ||
| 87 | ||
| 88 | (* | |
| 89 | PopInput - restores Write to use the previous output procedure. | |
| 90 | *) | |
| 91 | ||
| 92 | PROCEDURE PopInput ; | |
| 93 | ||
| 94 | ||
| 95 | (* | |
| 96 | GetCurrentInput - returns the current input procedure. | |
| 97 | *) | |
| 98 | ||
| 99 | PROCEDURE GetCurrentInput () : ProcRead ; | |
| 100 | ||
| 101 | ||
| 102 | END StdIO. |