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getcwd-lgpl: relax test for FreeBSD

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getcwd(NULL, 1) mallocs a larger buffer on BSD, rather than failing
with ERANGE as on glibc.  This behavior difference is not worth
coding around, as it is an uncommon use of getcwd in the first place.

* doc/posix-functions/getcwd.texi (getcwd): Document portability
issue.
* tests/test-getcwd-lgpl.c (main): Relax test.
Reported by Matthias Bolte.

Signed-off-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Eric Blake
2011-05-13 10:26:08 -06:00
parent 4104cd4f77
commit c6dc8f16f1
3 changed files with 33 additions and 4 deletions
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8
ChangeLog
View File

@@ -1,3 +1,11 @@
2011-05-13 Eric Blake <eblake@redhat.com>
getcwd-lgpl: relax test for FreeBSD
* doc/posix-functions/getcwd.texi (getcwd): Document portability
issue.
* tests/test-getcwd-lgpl.c (main): Relax test.
Reported by Matthias Bolte.
2011-05-11 Eric Blake <eblake@redhat.com>
test-fflush: silence compiler warning

10
doc/posix-functions/getcwd.texi
View File

@@ -11,8 +11,7 @@ Portability problems fixed by either Gnulib module @code{getcwd} or
@itemize
@item
On glibc platforms, @code{getcwd (NULL, n)} allocates memory for the result.
On some other platforms, this call is not allowed. Conversely, mingw fails
to honor non-zero @code{n}.
On some other platforms, this call is not allowed.
@item
On some platforms, the prototype for @code{getcwd} uses @code{int}
instead of @code{size_t} for the size argument:
@@ -30,4 +29,11 @@ correctly on some platforms.
Portability problems not fixed by Gnulib:
@itemize
@item
When using @code{getcwd(NULL, nonzero)}, some platforms, such as glibc
or cygwin, allocate exactly @code{nonzero} bytes and fail with
@code{ERANGE} if it was not big enough, while other platforms, such as
FreeBSD or mingw, ignore the size argument and allocate whatever size
is necessary. If this call succeeds, an application cannot portably
access beyond the string length of the result.
@end itemize

19
tests/test-getcwd-lgpl.c
View File

@@ -65,12 +65,22 @@ main (int argc, char **argv)
pwd2 = malloc (len + 2);
for ( ; i <= len; i++)
{
char *tmp;
errno = 0;
ASSERT (getcwd (pwd2, i) == NULL);
ASSERT (errno == ERANGE);
/* Allow either glibc or BSD behavior, since POSIX allows both. */
errno = 0;
ASSERT (getcwd (NULL, i) == NULL);
ASSERT (errno == ERANGE);
tmp = getcwd (NULL, i);
if (tmp)
{
ASSERT (strcmp (pwd1, tmp) == 0);
free (tmp);
}
else
{
ASSERT (errno == ERANGE);
}
}
ASSERT (getcwd (pwd2, len + 1) == pwd2);
pwd2[len] = '/';
@@ -80,6 +90,11 @@ main (int argc, char **argv)
ASSERT (strstr (pwd2, "/../") == NULL);
ASSERT (strstr (pwd2 + 1 + (pwd2[1] == '/'), "//") == NULL);
/* Validate a POSIX requirement on size. */
errno = 0;
ASSERT (getcwd(pwd2, 0) == NULL);
ASSERT (errno == EINVAL);
free (pwd1);
free (pwd2);