blob: c4ccda8a647bc9099a79bb53a76e8d9256d8d017
1 | /* printenv -- minimal clone of BSD printenv(1). |
2 | |
3 | usage: printenv [varname] |
4 | |
5 | Chet Ramey |
6 | chet@po.cwru.edu |
7 | */ |
8 | |
9 | /* Copyright (C) 1997-2002 Free Software Foundation, Inc. |
10 | |
11 | This file is part of GNU Bash, the Bourne Again SHell. |
12 | |
13 | Bash is free software; you can redistribute it and/or modify it under |
14 | the terms of the GNU General Public License as published by the Free |
15 | Software Foundation; either version 2, or (at your option) any later |
16 | version. |
17 | |
18 | Bash is distributed in the hope that it will be useful, but WITHOUT ANY |
19 | WARRANTY; without even the implied warranty of MERCHANTABILITY or |
20 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
21 | for more details. |
22 | |
23 | You should have received a copy of the GNU General Public License along |
24 | with Bash; see the file COPYING. If not, write to the Free Software |
25 | Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */ |
26 | |
27 | #include <stdlib.h> |
28 | #include <string.h> |
29 | |
30 | extern char **environ; |
31 | |
32 | int |
33 | main (argc, argv) |
34 | int argc; |
35 | char **argv; |
36 | { |
37 | register char **envp, *eval; |
38 | int len; |
39 | |
40 | argv++; |
41 | argc--; |
42 | |
43 | /* printenv */ |
44 | if (argc == 0) |
45 | { |
46 | for (envp = environ; *envp; envp++) |
47 | puts (*envp); |
48 | exit(EXIT_SUCCESS); |
49 | } |
50 | |
51 | /* printenv varname */ |
52 | len = strlen (*argv); |
53 | for (envp = environ; *envp; envp++) |
54 | { |
55 | if (**argv == **envp && strncmp (*envp, *argv, len) == 0) |
56 | { |
57 | eval = *envp + len; |
58 | /* If the environment variable doesn't have an `=', ignore it. */ |
59 | if (*eval == '=') |
60 | { |
61 | puts (eval + 1); |
62 | exit(EXIT_SUCCESS); |
63 | } |
64 | } |
65 | } |
66 | exit(EXIT_FAILURE); |
67 | } |
68 |