1 /* Derived from the test case in
2 https://sourceware.org/bugzilla/show_bug.cgi?id=1078. */
3 #include <stdio.h>
4 #include <stdlib.h>
5 #include <unistd.h>
6
7 #define OUT_SIZE 10000
8
9
10 static int fd;
11
12 static void prepare (void);
13 #define PREPARE(argc, argv) prepare ()
14
15 static int do_test (void);
16 #define TEST_FUNCTION do_test ()
17
18 #include "../test-skeleton.c"
19
20
21 static void
prepare(void)22 prepare (void)
23 {
24 fd = create_temp_file ("tst-fwrite.", NULL);
25 if (fd == -1)
26 {
27 puts ("cannot create temporary file");
28 exit (1);
29 }
30 }
31
32
33 static int
do_test(void)34 do_test (void)
35 {
36 FILE* f = fdopen (fd, "w+");
37 if (f == NULL) {
38 puts ("cannot create stream");
39 return 1;
40 }
41 puts ("Opened temp file");
42
43 if (fwrite ("a", 1, 1, f) != 1)
44 {
45 puts ("1st fwrite failed");
46 return 1;
47 }
48 puts ("Wrote a byte");
49 fflush (f);
50
51 char buffer[10000];
52 size_t i = fread (buffer, 1, sizeof (buffer), f);
53 printf ("Read %zu bytes\n", i);
54
55 for (i = 0; i < OUT_SIZE; i++)
56 {
57 if (fwrite ("n", 1, 1, f) != 1)
58 {
59 printf ("fwrite in loop round %zu failed\n", i);
60 return 1;
61 }
62
63 if ((i + 1) % 1000 == 0)
64 printf ("wrote %zu bytes ...\n", i + 1);
65 }
66
67 printf ("Wrote %i bytes [done]\n", OUT_SIZE);
68
69 return 0;
70 }
71