1 /* Test of POSIX compatible fflush() function.
2 Copyright (C) 2008 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 of the License, or
7 (at your option) 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 <http://www.gnu.org/licenses/>. */
23 /* This test can only be made to work on specific platforms. */
24 #if defined _IO_ferror_unlocked || defined __sferror /* GNU libc, BeOS; FreeBSD, NetBSD, OpenBSD, MacOS X, Cygwin */
25 # define ASSERT(expr) \
30 fprintf (stderr, "%s:%d: assertion failed\n", __FILE__, __LINE__); \
37 # define ASSERT(expr) \
42 printf ("Skipping test: expected failure on this platform\n"); \
50 main (int argc, char **argv)
53 /* Check fflush after a backup ungetc() call. This is case 1 in terms of
54 <http://lists.gnu.org/archive/html/bug-gnulib/2008-03/msg00131.html>.
55 The Austin Group has not yet decided how this should behave. */
58 /* Check fflush after a non-backup ungetc() call. This is case 2 in terms of
59 <http://lists.gnu.org/archive/html/bug-gnulib/2008-03/msg00131.html>.
60 The Austin Group has not yet decided how this should behave. */
61 /* Check that fflush after a non-backup ungetc() call discards the ungetc
62 buffer. This is mandated by POSIX
63 <http://www.opengroup.org/susv3/functions/ungetc.html>:
64 "The value of the file-position indicator for the stream after
65 reading or discarding all pushed-back bytes shall be the same
66 as it was before the bytes were pushed back." */
75 /* Here the file-position indicator must be 2. */
77 c = ungetc ('@', stdin);
82 /* Here the file-position indicator must be 2 again. */