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       1                 :            : /* Tests of unsetenv.
       2                 :            :    Copyright (C) 2009-2012 Free Software Foundation, Inc.
       3                 :            : 
       4                 :            :    This program is free software: you can redistribute it and/or modify
       5                 :            :    it under the terms of the GNU General Public License as published by
       6                 :            :    the Free Software Foundation; either version 3 of the License, or
       7                 :            :    (at your option) any later version.
       8                 :            : 
       9                 :            :    This program is distributed in the hope that it will be useful,
      10                 :            :    but WITHOUT ANY WARRANTY; without even the implied warranty of
      11                 :            :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      12                 :            :    GNU General Public License for more details.
      13                 :            : 
      14                 :            :    You should have received a copy of the GNU General Public License
      15                 :            :    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
      16                 :            : 
      17                 :            : /* Written by Eric Blake <ebb9@byu.net>, 2009.  */
      18                 :            : 
      19                 :            : #include <config.h>
      20                 :            : 
      21                 :            : #include <stdlib.h>
      22                 :            : 
      23                 :            : #include "signature.h"
      24                 :            : SIGNATURE_CHECK (unsetenv, int, (char const *));
      25                 :            : 
      26                 :            : #include <errno.h>
      27                 :            : #include <string.h>
      28                 :            : #include <unistd.h>
      29                 :            : 
      30                 :            : #include "macros.h"
      31                 :            : 
      32                 :            : int
      33                 :          1 : main (void)
      34                 :            : {
      35                 :          1 :   char entry[] = "b=2";
      36                 :            : 
      37                 :            :   /* Test removal when multiple entries present.  */
      38         [ -  + ]:          1 :   ASSERT (putenv ((char *) "a=1") == 0);
      39         [ -  + ]:          1 :   ASSERT (putenv (entry) == 0);
      40                 :          1 :   entry[0] = 'a'; /* Unspecified what getenv("a") would be at this point.  */
      41         [ -  + ]:          1 :   ASSERT (unsetenv ("a") == 0); /* Both entries will be removed.  */
      42         [ -  + ]:          1 :   ASSERT (getenv ("a") == NULL);
      43         [ -  + ]:          1 :   ASSERT (unsetenv ("a") == 0);
      44                 :            : 
      45                 :            :   /* Required to fail with EINVAL.  */
      46                 :          1 :   errno = 0;
      47         [ -  + ]:          1 :   ASSERT (unsetenv ("") == -1);
      48         [ -  + ]:          1 :   ASSERT (errno == EINVAL);
      49                 :          1 :   errno = 0;
      50         [ -  + ]:          1 :   ASSERT (unsetenv ("a=b") == -1);
      51         [ -  + ]:          1 :   ASSERT (errno == EINVAL);
      52                 :            : #if 0
      53                 :            :   /* glibc and gnulib's implementation guarantee this, but POSIX no
      54                 :            :      longer requires it: http://austingroupbugs.net/view.php?id=185  */
      55                 :            :   errno = 0;
      56                 :            :   ASSERT (unsetenv (NULL) == -1);
      57                 :            :   ASSERT (errno == EINVAL);
      58                 :            : #endif
      59                 :            : 
      60                 :          1 :   return 0;
      61                 :            : }