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__); \
36 # define ASSERT(expr) \
41 printf ("Skipping test: expected failure on this platform\n"); \
49 main (int argc, char **argv)
51 /* Check that fflush after a non-backup ungetc() call discards the ungetc
52 buffer. This is mandated by POSIX
53 <http://www.opengroup.org/susv3/functions/ungetc.html>:
54 "The value of the file-position indicator for the stream after
55 reading or discarding all pushed-back bytes shall be the same
56 as it was before the bytes were pushed back." */
65 /* Here the file-position indicator must be 2. */
67 c = ungetc ('@', stdin);
72 /* Here the file-position indicator must be 2 again. */