tests/test-getlogin_r.c

   1 /* Test of getting user name.
   2    Copyright (C) 2010-2020 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 Bruno Haible and Paul Eggert.  */
  18
  19 #include <config.h>
  20
  21 #include <unistd.h>
  22
  23 #include "signature.h"
  24 SIGNATURE_CHECK (getlogin_r, int, (char *, size_t));
  25
  26 #include "test-getlogin.h"
  27
  28 int
  29 main (void)
  30 {
  31   /* Test value.  */
  32   /* Test with a large enough buffer.  */
  33   char buf[1024];
  34   int err = getlogin_r (buf, sizeof buf);
  35   test_getlogin_result (buf, err);
  36
  37   /* Test with a small buffer.  */
  38   {
  39     char smallbuf[1024];
  40     size_t n = strlen (buf);
  41     size_t i;
  42
  43     for (i = 0; i <= n; i++)
  44       {
  45         err = getlogin_r (smallbuf, i);
  46         if (i == 0)
  47           ASSERT (err == ERANGE || err == EINVAL);
  48         else
  49           ASSERT (err == ERANGE);
  50       }
  51   }
  52
  53   /* Test with a huge buffer.  */
  54   {
  55     static char hugebuf[70000];
  56
  57     ASSERT (getlogin_r (hugebuf, sizeof (hugebuf)) == 0);
  58     ASSERT (strcmp (hugebuf, buf) == 0);
  59   }
  60
  61   return 0;
  62 }