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90 lines
2.8 KiB
C
90 lines
2.8 KiB
C
/* Test of POSIX compatible fflush() function.
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Copyright (C) 2008 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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/* This test can only be made to work on specific platforms. */
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#if defined _IO_ferror_unlocked || defined __sferror /* GNU libc, BeOS; FreeBSD, NetBSD, OpenBSD, MacOS X, Cygwin */
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# define ASSERT(expr) \
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do \
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{ \
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if (!(expr)) \
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{ \
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fprintf (stderr, "%s:%d: assertion failed\n", __FILE__, __LINE__); \
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fflush (stderr); \
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abort (); \
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} \
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} \
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while (0)
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#else
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# define ASSERT(expr) \
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do \
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{ \
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if (!(expr)) \
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{ \
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printf ("Skipping test: expected failure on this platform\n"); \
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exit (77); \
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} \
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} \
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while (0)
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#endif
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int
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main (int argc, char **argv)
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{
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#if 0
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/* Check fflush after a backup ungetc() call. This is case 1 in terms of
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<http://lists.gnu.org/archive/html/bug-gnulib/2008-03/msg00131.html>.
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The Austin Group has not yet decided how this should behave. */
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#endif
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#if 0
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/* Check fflush after a non-backup ungetc() call. This is case 2 in terms of
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<http://lists.gnu.org/archive/html/bug-gnulib/2008-03/msg00131.html>.
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The Austin Group has not yet decided how this should behave. */
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/* Check that fflush after a non-backup ungetc() call discards the ungetc
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buffer. This is mandated by POSIX
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<http://www.opengroup.org/susv3/functions/ungetc.html>:
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"The value of the file-position indicator for the stream after
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reading or discarding all pushed-back bytes shall be the same
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as it was before the bytes were pushed back." */
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int c;
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c = fgetc (stdin);
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ASSERT (c == '#');
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c = fgetc (stdin);
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ASSERT (c == '!');
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/* Here the file-position indicator must be 2. */
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c = ungetc ('@', stdin);
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ASSERT (c == '@');
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fflush (stdin);
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/* Here the file-position indicator must be 2 again. */
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c = fgetc (stdin);
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ASSERT (c == '/');
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#endif
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return 0;
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}
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