1 | /* Parsing of Suboptions Example |
2 | Copyright (C) 1991-2022 Free Software Foundation, Inc. |
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 |
15 | along with this program; if not, see <https://www.gnu.org/licenses/>. |
16 | */ |
17 | |
18 | #include <stdio.h> |
19 | #include <stdlib.h> |
20 | #include <unistd.h> |
21 | |
22 | int do_all; |
23 | const char *type; |
24 | int read_size; |
25 | int write_size; |
26 | int read_only; |
27 | |
28 | enum |
29 | { |
30 | RO_OPTION = 0, |
31 | RW_OPTION, |
32 | READ_SIZE_OPTION, |
33 | WRITE_SIZE_OPTION, |
34 | THE_END |
35 | }; |
36 | |
37 | const char *mount_opts[] = |
38 | { |
39 | [RO_OPTION] = "ro" , |
40 | [RW_OPTION] = "rw" , |
41 | [READ_SIZE_OPTION] = "rsize" , |
42 | [WRITE_SIZE_OPTION] = "wsize" , |
43 | [THE_END] = NULL |
44 | }; |
45 | |
46 | int |
47 | main (int argc, char **argv) |
48 | { |
49 | char *subopts, *value; |
50 | int opt; |
51 | |
52 | while ((opt = getopt (argc: argc, argv: argv, shortopts: "at:o:" )) != -1) |
53 | switch (opt) |
54 | { |
55 | case 'a': |
56 | do_all = 1; |
57 | break; |
58 | case 't': |
59 | type = optarg; |
60 | break; |
61 | case 'o': |
62 | subopts = optarg; |
63 | while (*subopts != '\0') |
64 | switch (getsubopt (optionp: &subopts, tokens: mount_opts, valuep: &value)) |
65 | { |
66 | case RO_OPTION: |
67 | read_only = 1; |
68 | break; |
69 | case RW_OPTION: |
70 | read_only = 0; |
71 | break; |
72 | case READ_SIZE_OPTION: |
73 | if (value == NULL) |
74 | abort (); |
75 | read_size = atoi (value); |
76 | break; |
77 | case WRITE_SIZE_OPTION: |
78 | if (value == NULL) |
79 | abort (); |
80 | write_size = atoi (value); |
81 | break; |
82 | default: |
83 | /* Unknown suboption. */ |
84 | printf (format: "Unknown suboption `%s'\n" , value); |
85 | break; |
86 | } |
87 | break; |
88 | default: |
89 | abort (); |
90 | } |
91 | |
92 | /* Do the real work. */ |
93 | |
94 | return 0; |
95 | } |
96 | |