expl: Work around inaccurate implementation on NetBSD.
[gnulib.git] / tests / test-strerror.c
blob0b4db955e72e50149bcd2b3131446305c0fc3e6e
1 /* Test of strerror() function.
2 Copyright (C) 2007-2019 Free Software Foundation, Inc.
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.
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.
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/>. */
17 /* Written by Eric Blake <ebb9@byu.net>, 2007. */
19 #include <config.h>
21 #include <string.h>
23 #include "signature.h"
24 SIGNATURE_CHECK (strerror, char *, (int));
26 #include <errno.h>
28 #include "macros.h"
30 int
31 main (void)
33 char *str;
35 errno = 0;
36 str = strerror (EACCES);
37 ASSERT (str);
38 ASSERT (*str);
39 ASSERT (errno == 0);
41 errno = 0;
42 str = strerror (ETIMEDOUT);
43 ASSERT (str);
44 ASSERT (*str);
45 ASSERT (errno == 0);
47 errno = 0;
48 str = strerror (EOVERFLOW);
49 ASSERT (str);
50 ASSERT (*str);
51 ASSERT (errno == 0);
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);
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);
74 return 0;