Statistics
| Branch: | Revision:

scoutos / prex-0.9.0 / usr / bin / printenv / printenv.c @ 03e9c04a

History | View | Annotate | Download (2.41 KB)

1
/*
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
}