tests/test-strerror.c

   1 /* Test of strerror() function.
   2    Copyright (C) 2007-2020 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, or (at your option)
   7    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>, 2007.  */
  18
  19 #include <config.h>
  20
  21 #include <string.h>
  22
  23 #include "signature.h"
  24 SIGNATURE_CHECK (strerror, char *, (int));
  25
  26 #include <errno.h>
  27
  28 #include "macros.h"
  29
  30 int
  31 main (void)
  32 {
  33   char *str;
  34
  35   errno = 0;
  36   str = strerror (EACCES);
  37   ASSERT (str);
  38   ASSERT (*str);
  39   ASSERT (errno == 0);
  40
  41   errno = 0;
  42   str = strerror (ETIMEDOUT);
  43   ASSERT (str);
  44   ASSERT (*str);
  45   ASSERT (errno == 0);
  46
  47   errno = 0;
  48   str = strerror (EOVERFLOW);
  49   ASSERT (str);
  50   ASSERT (*str);
  51   ASSERT (errno == 0);
  52
  53   /* POSIX requires strerror (0) to succeed.  Reject use of "Unknown
  54      error", but allow "Success", "No error", or even Solaris' "Error
  55      0" which are distinct patterns from true out-of-range strings.
  56      http://austingroupbugs.net/view.php?id=382  */
  57   errno = 0;
  58   str = strerror (0);
  59   ASSERT (str);
  60   ASSERT (*str);
  61   ASSERT (errno == 0);
  62   ASSERT (strstr (str, "nknown") == NULL);
  63   ASSERT (strstr (str, "ndefined") == NULL);
  64
  65   /* POSIX requires strerror to produce a non-NULL result for all
  66      inputs; as an extension, we also guarantee a non-empty result.
  67      Reporting EINVAL is optional.  */
  68   errno = 0;
  69   str = strerror (-3);
  70   ASSERT (str);
  71   ASSERT (*str);
  72   ASSERT (errno == 0 || errno == EINVAL);
  73
  74   return 0;
  75 }