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1eee94d3 GM |
1 | (* StringChan.mod implements String input/output over channels. |
2 | ||
83ffe9cd | 3 | Copyright (C) 2009-2023 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 | IMPLEMENTATION MODULE StringChan ; | |
28 | ||
29 | ||
30 | FROM DynamicStrings IMPORT Length, char ; | |
31 | FROM TextIO IMPORT WriteChar ; | |
32 | ||
33 | ||
34 | (* | |
35 | writeString - writes a string, s, to ChanId, cid. | |
36 | The string, s, is not destroyed. | |
37 | *) | |
38 | ||
39 | PROCEDURE writeString (cid: IOChan.ChanId; s: String) ; | |
40 | VAR | |
41 | i, h: CARDINAL ; | |
42 | BEGIN | |
43 | h := Length(s) ; | |
44 | i := 0 ; | |
45 | WHILE i<h DO | |
46 | WriteChar(cid, char(s, i)) ; | |
47 | INC(i) | |
48 | END | |
49 | END writeString ; | |
50 | ||
51 | ||
52 | (* | |
53 | writeFieldWidth - writes a string, s, to ChanId, cid. | |
54 | The string, s, is not destroyed and it | |
55 | is prefixed by spaces so that at least, | |
56 | width, characters are written. If the | |
57 | string, s, is longer than width then | |
58 | no spaces are prefixed to the output | |
59 | and the entire string is written. | |
60 | *) | |
61 | ||
62 | PROCEDURE writeFieldWidth (cid: IOChan.ChanId; | |
63 | s: String; width: CARDINAL) ; | |
64 | VAR | |
65 | i: CARDINAL ; | |
66 | BEGIN | |
67 | i := Length(s) ; | |
68 | WHILE i<width DO | |
69 | WriteChar(cid, ' ') ; | |
70 | INC(i) | |
71 | END ; | |
72 | writeString(cid, s) | |
73 | END writeFieldWidth ; | |
74 | ||
75 | ||
76 | END StringChan. |