summaryrefslogtreecommitdiff
path: root/shell/ash_test/printenv.c
blob: 06df21fdc90258dab3f79f187c64bcd660367231 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
/* printenv -- minimal clone of BSD printenv(1).

   usage: printenv [varname]

   Chet Ramey
   chet@po.cwru.edu
*/

/* Copyright (C) 1997-2002 Free Software Foundation, Inc.

   This file is part of GNU Bash, the Bourne Again SHell.

   Bash is free software; you can redistribute it and/or modify it under
   the terms of the GNU General Public License as published by the Free
   Software Foundation; either version 2, or (at your option) any later
   version.

   Bash is distributed in the hope that it will be useful, but WITHOUT ANY
   WARRANTY; without even the implied warranty of MERCHANTABILITY or
   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
   for more details.

   You should have received a copy of the GNU General Public License along
   with Bash; see the file COPYING.  If not, write to the Free Software
   Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */

#include <stdlib.h>
#include <string.h>

extern char **environ;

int
main (argc, argv)
     int argc;
     char **argv;
{
  register char **envp, *eval;
  int len;

  argv++;
  argc--;

  /* printenv */
  if (argc == 0)
    {
      for (envp = environ; *envp; envp++)
	puts (*envp);
      exit (0);
    }

  /* printenv varname */
  len = strlen (*argv);
  for (envp = environ; *envp; envp++)
    {
      if (**argv == **envp && strncmp (*envp, *argv, len) == 0)
	{
	  eval = *envp + len;
	  /* If the environment variable doesn't have an `=', ignore it. */
	  if (*eval == '=')
	    {
	      puts (eval + 1);
	      exit (0);
	    }
	}
    }
  exit (1);
}