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
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
|
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/types.h>
#define TEST_FILE "test-1"
int
main (void)
{
const char blah[] = "BLAH";
FILE *fp;
char *mmap_data;
int ch, fd;
struct stat fs;
const char *cp;
/* setup the physical file, and use it */
if ((fp = fopen (TEST_FILE, "w+")) == NULL)
exit (1);
if (fwrite (blah, 1, strlen (blah), fp) != strlen (blah))
exit (2);
rewind (fp);
printf ("file: ");
cp = blah;
while ((ch = getc (fp)) != EOF)
{
fputc (ch, stdout);
if (ch != *cp)
{
printf ("\ncharacter %td: '%c' instead of '%c'\n",
cp - blah, ch, *cp);
exit (1);
}
++cp;
}
fputc ('\n', stdout);
if (ferror (fp))
{
puts ("fp: error");
exit (1);
}
if (feof (fp))
printf ("fp: EOF\n");
else
{
puts ("not EOF");
exit (1);
}
fclose (fp);
/* Now, mmap the file into a buffer, and do that too */
if ((fd = open (TEST_FILE, O_RDONLY)) == -1)
exit (3);
if (fstat (fd, &fs) == -1)
exit (4);
if ((mmap_data = (char *) mmap (NULL, fs.st_size, PROT_READ,
MAP_SHARED, fd, 0)) == MAP_FAILED)
{
if (errno == ENOSYS)
exit (0);
exit (5);
}
if ((fp = fmemopen (mmap_data, fs.st_size, "r")) == NULL)
exit (1);
printf ("mem: ");
cp = blah;
while ((ch = getc (fp)) != EOF)
{
fputc (ch, stdout);
if (ch != *cp)
{
printf ("%td character: '%c' instead of '%c'\n",
cp - blah, ch, *cp);
exit (1);
}
++cp;
}
fputc ('\n', stdout);
if (ferror (fp))
{
puts ("fp: error");
exit (1);
}
if (feof (fp))
printf ("fp: EOF\n");
else
{
puts ("not EOF");
exit (1);
}
fclose (fp);
munmap (mmap_data, fs.st_size);
unlink (TEST_FILE);
return 0;
}
|
