printenv.c - sbase - suckless unix tools | |
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printenv.c (546B) | |
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1 /* See LICENSE file for copyright and license details. */ | |
2 #include <stdio.h> | |
3 #include <stdlib.h> | |
4 | |
5 #include "util.h" | |
6 | |
7 extern char **environ; | |
8 | |
9 static void | |
10 usage(void) | |
11 { | |
12 eprintf("usage: %s [var ...]\n", argv0); | |
13 } | |
14 | |
15 int | |
16 main(int argc, char *argv[]) | |
17 { | |
18 char *var; | |
19 int ret = 0; | |
20 | |
21 ARGBEGIN { | |
22 default: | |
23 usage(); | |
24 } ARGEND | |
25 | |
26 if (!argc) { | |
27 for (; *environ; environ++) | |
28 puts(*environ); | |
29 } else { | |
30 for (; *argv; argc--, argv++) { | |
31 if ((var = getenv(*argv))) | |
32 puts(var); | |
33 else | |
34 ret = 1; | |
35 } | |
36 } | |
37 | |
38 return fshut(stdout, "<stdout>") ? 2 : ret; | |
39 } |