1 /* Test of fgetc() function.
2 Copyright (C) 2011-2019 Free Software Foundation, Inc.
3
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, or (at your option)
7 any later version.
8
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.
13
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, see <https://www.gnu.org/licenses/>. */
16
17 #include <config.h>
18
19 #include <stdio.h>
20
21 #include "signature.h"
22 SIGNATURE_CHECK (fgetc, int, (FILE *));
23
24 #include <errno.h>
25 #include <fcntl.h>
26 #include <unistd.h>
27
28 #if HAVE_MSVC_INVALID_PARAMETER_HANDLER
29 # include "msvc-inval.h"
30 #endif
31
32 #include "macros.h"
33
34 int
main(int argc,char ** argv)35 main (int argc, char **argv)
36 {
37 const char *filename = "test-fgetc.txt";
38
39 /* We don't have an fgetc() function that installs an invalid parameter
40 handler so far. So install that handler here, explicitly. */
41 #if HAVE_MSVC_INVALID_PARAMETER_HANDLER \
42 && MSVC_INVALID_PARAMETER_HANDLING == DEFAULT_HANDLING
43 gl_msvc_inval_ensure_handler ();
44 #endif
45
46 /* Prepare a file. */
47 {
48 const char text[] = "hello world";
49 int fd = open (filename, O_RDWR | O_CREAT | O_TRUNC, 0600);
50 ASSERT (fd >= 0);
51 ASSERT (write (fd, text, sizeof (text)) == sizeof (text));
52 ASSERT (close (fd) == 0);
53 }
54
55 /* Test that fgetc() sets errno if someone else closes the stream
56 fd behind the back of stdio. */
57 {
58 FILE *fp = fopen (filename, "r");
59 ASSERT (fp != NULL);
60 ASSERT (close (fileno (fp)) == 0);
61 errno = 0;
62 ASSERT (fgetc (fp) == EOF);
63 ASSERT (errno == EBADF);
64 ASSERT (ferror (fp));
65 fclose (fp);
66 }
67
68 /* Test that fgetc() sets errno if the stream was constructed with
69 an invalid file descriptor. */
70 {
71 FILE *fp = fdopen (-1, "r");
72 if (fp != NULL)
73 {
74 errno = 0;
75 ASSERT (fgetc (fp) == EOF);
76 ASSERT (errno == EBADF);
77 ASSERT (ferror (fp));
78 fclose (fp);
79 }
80 }
81 {
82 FILE *fp;
83 close (99);
84 fp = fdopen (99, "r");
85 if (fp != NULL)
86 {
87 errno = 0;
88 ASSERT (fgetc (fp) == EOF);
89 ASSERT (errno == EBADF);
90 ASSERT (ferror (fp));
91 fclose (fp);
92 }
93 }
94
95 /* Clean up. */
96 unlink (filename);
97
98 return 0;
99 }
100