scoutos / prex-0.9.0 / usr / bin / printenv / printenv.c @ 03e9c04a
History | View | Annotate | Download (2.41 KB)
1 | 03e9c04a | Brad Neuman | /*
|
---|---|---|---|
2 | * Copyright (c) 1987, 1993
|
||
3 | * The Regents of the University of California. All rights reserved.
|
||
4 | *
|
||
5 | * Redistribution and use in source and binary forms, with or without
|
||
6 | * modification, are permitted provided that the following conditions
|
||
7 | * are met:
|
||
8 | * 1. Redistributions of source code must retain the above copyright
|
||
9 | * notice, this list of conditions and the following disclaimer.
|
||
10 | * 2. Redistributions in binary form must reproduce the above copyright
|
||
11 | * notice, this list of conditions and the following disclaimer in the
|
||
12 | * documentation and/or other materials provided with the distribution.
|
||
13 | * 3. Neither the name of the University nor the names of its contributors
|
||
14 | * may be used to endorse or promote products derived from this software
|
||
15 | * without specific prior written permission.
|
||
16 | *
|
||
17 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
||
18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||
19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||
20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
||
21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||
22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
||
23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||
24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||
25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
||
26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
||
27 | * SUCH DAMAGE.
|
||
28 | */
|
||
29 | |||
30 | #include <unistd.h> |
||
31 | #include <stdio.h> |
||
32 | #include <stdlib.h> |
||
33 | #include <string.h> |
||
34 | |||
35 | extern char **environ; |
||
36 | |||
37 | static void usage(void); |
||
38 | |||
39 | |||
40 | #ifdef CMDBOX
|
||
41 | #define main(argc, argv) printenv_main(argc, argv)
|
||
42 | #endif
|
||
43 | |||
44 | /*
|
||
45 | * printenv
|
||
46 | *
|
||
47 | * Bill Joy, UCB
|
||
48 | * February, 1979
|
||
49 | */
|
||
50 | int
|
||
51 | main(int argc, char *argv[]) |
||
52 | { |
||
53 | char *cp, **ep;
|
||
54 | size_t len; |
||
55 | int ch;
|
||
56 | |||
57 | while ((ch = getopt(argc, argv, "")) != EOF) |
||
58 | switch(ch) {
|
||
59 | case '?': |
||
60 | default:
|
||
61 | usage(); |
||
62 | } |
||
63 | argc -= optind; |
||
64 | argv += optind; |
||
65 | |||
66 | if (argc == 0) { |
||
67 | for (ep = environ; *ep; ep++)
|
||
68 | (void)printf("%s\n", *ep); |
||
69 | exit(0);
|
||
70 | } |
||
71 | len = strlen(*argv); |
||
72 | for (ep = environ; *ep; ep++)
|
||
73 | if (!memcmp(*ep, *argv, len)) {
|
||
74 | cp = *ep + len; |
||
75 | if (!*cp || *cp == '=') { |
||
76 | (void)printf("%s\n", *cp ? cp + 1 : cp); |
||
77 | exit(0);
|
||
78 | } |
||
79 | } |
||
80 | exit(1);
|
||
81 | } |
||
82 | |||
83 | static void |
||
84 | usage(void)
|
||
85 | { |
||
86 | (void)fprintf(stderr, "usage: printenv [name]\n"); |
||
87 | exit(1);
|
||
88 | } |