1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
|
/* Copyright (C) 1991, 1992, 1996, 1997 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <stdio.h>
#define TESTFILE "/tmp/test.dat"
int
main (void)
{
FILE *fp;
int i, j;
puts ("\nFile seek test");
fp = fopen (TESTFILE, "w");
if (fp == NULL)
{
perror (TESTFILE);
return 1;
}
for (i = 0; i < 256; i++)
putc (i, fp);
if (freopen (TESTFILE, "r", fp) != fp)
{
perror ("Cannot open file for reading");
return 1;
}
for (i = 1; i <= 255; i++)
{
printf ("%3d\n", i);
fseek (fp, (long) -i, SEEK_END);
if ((j = getc (fp)) != 256 - i)
{
printf ("SEEK_END failed %d\n", j);
break;
}
if (fseek (fp, (long) i, SEEK_SET))
{
puts ("Cannot SEEK_SET");
break;
}
if ((j = getc (fp)) != i)
{
printf ("SEEK_SET failed %d\n", j);
break;
}
if (fseek (fp, (long) i, SEEK_SET))
{
puts ("Cannot SEEK_SET");
break;
}
if (fseek (fp, (long) (i >= 128 ? -128 : 128), SEEK_CUR))
{
puts ("Cannot SEEK_CUR");
break;
}
if ((j = getc (fp)) != (i >= 128 ? i - 128 : i + 128))
{
printf ("SEEK_CUR failed %d\n", j);
break;
}
}
fclose (fp);
remove (TESTFILE);
puts ((i > 255) ? "Test succeeded." : "Test FAILED!");
return (i > 255) ? 0 : 1;
}
|
