1 /* Test of fputc() function.
2 Copyright (C) 2011-2020 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 (fputc, int, (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-fputc.txt";
38
39 /* We don't have an fputc() 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 /* Test that fputc() on an unbuffered stream sets errno if someone else
47 closes the stream fd behind the back of stdio. */
48 {
49 FILE *fp = fopen (filename, "w");
50 ASSERT (fp != NULL);
51 setvbuf (fp, NULL, _IONBF, 0);
52 ASSERT (close (fileno (fp)) == 0);
53 errno = 0;
54 ASSERT (fputc ('x', fp) == EOF);
55 ASSERT (errno == EBADF);
56 ASSERT (ferror (fp));
57 fclose (fp);
58 }
59
60 /* Test that fputc() on an unbuffered stream sets errno if the stream
61 was constructed with an invalid file descriptor. */
62 {
63 FILE *fp = fdopen (-1, "w");
64 if (fp != NULL)
65 {
66 setvbuf (fp, NULL, _IONBF, 0);
67 errno = 0;
68 ASSERT (fputc ('x', fp) == EOF);
69 ASSERT (errno == EBADF);
70 ASSERT (ferror (fp));
71 fclose (fp);
72 }
73 }
74 {
75 FILE *fp;
76 close (99);
77 fp = fdopen (99, "w");
78 if (fp != NULL)
79 {
80 setvbuf (fp, NULL, _IONBF, 0);
81 errno = 0;
82 ASSERT (fputc ('x', fp) == EOF);
83 ASSERT (errno == EBADF);
84 ASSERT (ferror (fp));
85 fclose (fp);
86 }
87 }
88
89 /* Clean up. */
90 unlink (filename);
91
92 return 0;
93 }
94