tests/test-setenv.c

   1 /* Tests of setenv.
   2    Copyright (C) 2009-2024 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 <https://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 (setenv, int, (char const *, char const *, int));
  25
  26 #include <errno.h>
  27 #include <string.h>
  28 #include <unistd.h>
  29
  30 #include "macros.h"
  31
  32 int
  33 main (void)
  34 {
  35   /* Test overwriting.  */
  36   ASSERT (setenv ("a", "==", -1) == 0);
  37   ASSERT (setenv ("a", "2", 0) == 0);
  38   ASSERT (strcmp (getenv ("a"), "==") == 0);
  39
  40   /* Required to fail with EINVAL.  */
  41   errno = 0;
  42   ASSERT (setenv ("", "", 1) == -1);
  43   ASSERT (errno == EINVAL);
  44   errno = 0;
  45   ASSERT (setenv ("a=b", "", 0) == -1);
  46   ASSERT (errno == EINVAL);
  47 #if 0
  48   /* glibc and gnulib's implementation guarantee this, but POSIX no
  49      longer requires it: https://austingroupbugs.net/view.php?id=185  */
  50   errno = 0;
  51   ASSERT (setenv (NULL, "", 0) == -1);
  52   ASSERT (errno == EINVAL);
  53 #endif
  54
  55   return test_exit_status;
  56 }