1 /* Test of fwritable() function.
2 Copyright (C) 2007-2009 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 "fwritable.h"
26 /* None of the files accessed by this test are large, so disable the
27 fseek link warning if we are not using the gnulib fseek module. */
32 #define ASSERT(expr) \
37 fprintf (stderr, "%s:%d: assertion failed\n", __FILE__, __LINE__); \
44 #define TESTFILE "t-fwritable.tmp"
51 /* Create a file with some contents. */
52 fp = fopen (TESTFILE, "w");
55 ASSERT (fwritable (fp));
56 if (fwrite ("foobarsh", 1, 8, fp) < 8)
58 ASSERT (fwritable (fp));
62 /* Open it in read-only mode. */
63 fp = fopen (TESTFILE, "r");
66 ASSERT (!fwritable (fp));
67 if (fgetc (fp) != 'f')
69 ASSERT (!fwritable (fp));
70 if (fseek (fp, 2, SEEK_CUR))
72 ASSERT (!fwritable (fp));
73 if (fgetc (fp) != 'b')
75 ASSERT (!fwritable (fp));
77 ASSERT (!fwritable (fp));
78 if (fgetc (fp) != 'a')
80 ASSERT (!fwritable (fp));
81 if (fseek (fp, 0, SEEK_END))
83 ASSERT (!fwritable (fp));
87 /* Open it in read-write mode. */
88 fp = fopen (TESTFILE, "r+");
91 ASSERT (fwritable (fp));
92 if (fgetc (fp) != 'f')
94 ASSERT (fwritable (fp));
95 if (fseek (fp, 2, SEEK_CUR))
97 ASSERT (fwritable (fp));
98 if (fgetc (fp) != 'b')
100 ASSERT (fwritable (fp));
102 ASSERT (fwritable (fp));
103 if (fgetc (fp) != 'a')
105 ASSERT (fwritable (fp));
106 if (fputc ('z', fp) != 'z')
108 ASSERT (fwritable (fp));
109 if (fseek (fp, 0, SEEK_END))
111 ASSERT (fwritable (fp));
115 /* Open it in append mode. */
116 fp = fopen (TESTFILE, "a");
119 ASSERT (fwritable (fp));
120 if (fwrite ("bla", 1, 3, fp) < 3)
122 ASSERT (fwritable (fp));
129 fprintf (stderr, "Skipping test: file operations failed.\n");