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d9a17c07 | 1 | /* Introduction to Non-Local Exits |
d614a753 | 2 | Copyright (C) 1991-2020 Free Software Foundation, Inc. |
d9a17c07 RM |
3 | |
4 | This program is free software; you can redistribute it and/or | |
5 | modify it under the terms of the GNU General Public License | |
6 | as published by the Free Software Foundation; either version 2 | |
7 | of the License, or (at your option) any later version. | |
8 | ||
9 | This program is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | GNU General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU General Public License | |
5a82c748 | 15 | along with this program; if not, see <https://www.gnu.org/licenses/>. |
d9a17c07 RM |
16 | */ |
17 | ||
28f540f4 RM |
18 | #include <setjmp.h> |
19 | #include <stdlib.h> | |
20 | #include <stdio.h> | |
21 | ||
22 | jmp_buf main_loop; | |
23 | ||
d9a17c07 | 24 | void |
28f540f4 RM |
25 | abort_to_main_loop (int status) |
26 | { | |
27 | longjmp (main_loop, status); | |
28 | } | |
29 | ||
30 | int | |
31 | main (void) | |
32 | { | |
33 | while (1) | |
34 | if (setjmp (main_loop)) | |
35 | puts ("Back at main loop...."); | |
36 | else | |
37 | do_command (); | |
38 | } | |
39 | ||
40 | ||
d9a17c07 | 41 | void |
28f540f4 RM |
42 | do_command (void) |
43 | { | |
44 | char buffer[128]; | |
45 | if (fgets (buffer, 128, stdin) == NULL) | |
46 | abort_to_main_loop (-1); | |
47 | else | |
48 | exit (EXIT_SUCCESS); | |
49 | } |