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/* Test of strerror_r() function.
Copyright (C) 2007-2021 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, see <https://www.gnu.org/licenses/>. */
#include <config.h>
#include <string.h>
#include "signature.h"
SIGNATURE_CHECK (strerror_r, int, (int, char *, size_t));
#include <errno.h>
#include "macros.h"
int
main (void)
{
char buf[100];
int ret;
/* Test results with valid errnum and enough room. */
errno = 0;
buf[0] = '\0';
ASSERT (strerror_r (EACCES, buf, sizeof buf) == 0);
ASSERT (buf[0] != '\0');
ASSERT (errno == 0);
ASSERT (strlen (buf) < sizeof buf);
errno = 0;
buf[0] = '\0';
ASSERT (strerror_r (ETIMEDOUT, buf, sizeof buf) == 0);
ASSERT (buf[0] != '\0');
ASSERT (errno == 0);
ASSERT (strlen (buf) < sizeof buf);
errno = 0;
buf[0] = '\0';
ASSERT (strerror_r (EOVERFLOW, buf, sizeof buf) == 0);
ASSERT (buf[0] != '\0');
ASSERT (errno == 0);
ASSERT (strlen (buf) < sizeof buf);
/* POSIX requires strerror (0) to succeed. Reject use of "Unknown
error", but allow "Success", "No error", or even Solaris' "Error
0" which are distinct patterns from true out-of-range strings.
http://austingroupbugs.net/view.php?id=382 */
errno = 0;
buf[0] = '\0';
ret = strerror_r (0, buf, sizeof buf);
ASSERT (ret == 0);
ASSERT (buf[0]);
ASSERT (errno == 0);
ASSERT (strstr (buf, "nknown") == NULL);
ASSERT (strstr (buf, "ndefined") == NULL);
/* Test results with out-of-range errnum and enough room. POSIX
allows an empty string on success, and allows an unchanged buf on
error, but these are not useful, so we guarantee contents. */
errno = 0;
buf[0] = '^';
ret = strerror_r (-3, buf, sizeof buf);
ASSERT (ret == 0 || ret == EINVAL);
ASSERT (buf[0] != '^');
ASSERT (*buf);
ASSERT (errno == 0);
ASSERT (strlen (buf) < sizeof buf);
/* Test results with a too small buffer. POSIX requires an error;
only ERANGE for 0 and valid errors, and a choice of ERANGE or
EINVAL for out-of-range values. On error, POSIX permits buf to
be empty, unchanged, or unterminated, but these are not useful,
so we guarantee NUL-terminated truncated contents for all but
size 0. http://austingroupbugs.net/view.php?id=398. Also ensure
that no out-of-bounds writes occur. */
{
int errs[] = { EACCES, 0, -3, };
int j;
buf[sizeof buf - 1] = '\0';
for (j = 0; j < SIZEOF (errs); j++)
{
int err = errs[j];
char buf2[sizeof buf] = "";
size_t len;
size_t i;
strerror_r (err, buf2, sizeof buf2);
len = strlen (buf2);
ASSERT (len < sizeof buf);
for (i = 0; i <= len; i++)
{
memset (buf, '^', sizeof buf - 1);
errno = 0;
ret = strerror_r (err, buf, i);
ASSERT (errno == 0);
if (j == 2)
ASSERT (ret == ERANGE || ret == EINVAL);
else
ASSERT (ret == ERANGE);
if (i)
{
ASSERT (strncmp (buf, buf2, i - 1) == 0);
ASSERT (buf[i - 1] == '\0');
}
ASSERT (strspn (buf + i, "^") == sizeof buf - 1 - i);
}
strcpy (buf, "BADFACE");
errno = 0;
ret = strerror_r (err, buf, len + 1);
ASSERT (ret != ERANGE);
ASSERT (errno == 0);
ASSERT (strcmp (buf, buf2) == 0);
}
}
#if GNULIB_STRERROR
/* Test that strerror_r does not clobber strerror buffer. On some
platforms, this test can only succeed if gnulib also replaces
strerror. */
{
const char *msg1;
const char *msg2;
const char *msg3;
const char *msg4;
char *str1;
char *str2;
char *str3;
char *str4;
msg1 = strerror (ENOENT);
ASSERT (msg1);
str1 = strdup (msg1);
ASSERT (str1);
msg2 = strerror (ERANGE);
ASSERT (msg2);
str2 = strdup (msg2);
ASSERT (str2);
msg3 = strerror (-4);
ASSERT (msg3);
str3 = strdup (msg3);
ASSERT (str3);
msg4 = strerror (1729576);
ASSERT (msg4);
str4 = strdup (msg4);
ASSERT (str4);
strerror_r (EACCES, buf, sizeof buf);
strerror_r (-5, buf, sizeof buf);
ASSERT (STREQ (msg4, str4));
free (str1);
free (str2);
free (str3);
free (str4);
}
#endif
return 0;
}
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