1 /* Test of freading() function.
2 Copyright (C) 2007 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 2, or (at your option)
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, write to the Free Software Foundation,
16 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
18 /* Written by Bruno Haible <bruno@clisp.org>, 2007. */
26 #define ASSERT(expr) if (!(expr)) abort ();
28 #define TESTFILE "t-freading.tmp"
35 /* Create a file with some contents. Write-only file is never reading. */
36 fp = fopen (TESTFILE, "w");
39 ASSERT (!freading (fp));
40 if (fwrite ("foobarsh", 1, 8, fp) < 8)
42 ASSERT (!freading (fp));
46 /* Open it in read-only mode. Read-only file is always reading. */
47 fp = fopen (TESTFILE, "r");
50 ASSERT (freading (fp));
51 if (fgetc (fp) != 'f')
53 ASSERT (freading (fp));
54 if (fseek (fp, 2, SEEK_CUR))
56 ASSERT (freading (fp));
57 if (fgetc (fp) != 'b')
59 ASSERT (freading (fp));
60 if (fseek (fp, 0, SEEK_END))
62 ASSERT (freading (fp));
66 /* Open it in read-write mode. POSIX requires a reposition (fseek,
67 fsetpos, rewind) or EOF when transitioning from read to write;
68 freading is only deterministic after input or output, but this
69 test case should be portable even on open, after reposition, and
71 fp = fopen (TESTFILE, "r+");
74 ASSERT (!freading (fp));
75 if (fgetc (fp) != 'f')
77 ASSERT (freading (fp));
78 if (fseek (fp, 2, SEEK_CUR))
80 /* freading (fp)) is undefined here, but fwriting is false. */
81 if (fgetc (fp) != 'b')
83 ASSERT (freading (fp));
84 if (fseek (fp, 0, SEEK_CUR) != 0)
86 if (fputc ('z', fp) != 'z')
88 ASSERT (!freading (fp));
89 if (fseek (fp, 0, SEEK_END))
91 ASSERT (!freading (fp));
95 /* Open it in append mode. Write-only file is never reading. */
96 fp = fopen (TESTFILE, "a");
99 ASSERT (!freading (fp));
100 if (fwrite ("bla", 1, 3, fp) < 3)
102 ASSERT (!freading (fp));
109 fprintf (stderr, "Skipping test: file operations failed.\n");