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printenv.c - sbase - suckless unix tools
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printenv.c (546B)
---
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 }
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