1 /* Test of freadahead() function.
2 Copyright (C) 2007-2008 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/>. */
17 /* Written by Bruno Haible <bruno@clisp.org>, 2007. */
21 #include "freadahead.h"
27 #define ASSERT(expr) \
32 fprintf (stderr, "%s:%d: assertion failed\n", __FILE__, __LINE__); \
39 main (int argc, char **argv)
41 int nbytes = atoi (argv[1]);
44 void *buf = malloc (nbytes);
45 ASSERT (fread (buf, 1, nbytes, stdin) == nbytes);
49 ASSERT (freadahead (stdin) == 0);
52 if (lseek (0, 0, SEEK_CUR) == nbytes)
53 /* An unbuffered stdio, such as BeOS or on uClibc compiled without
55 ASSERT (freadahead (stdin) == 0);
58 /* Normal buffered stdio. */
62 ASSERT (freadahead (stdin) != 0);
63 buffered = freadahead (stdin);
66 ASSERT (freadahead (stdin) == buffered - 1);
68 ASSERT (freadahead (stdin) == buffered);
71 ASSERT (freadahead (stdin) == buffered - 1);
75 ASSERT (freadahead (stdin) == buffered);
78 ASSERT (freadahead (stdin) == buffered - 1);