| 1 | /* Test of POSIX compatible fflush() function.
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| 2 | Copyright (C) 2008-2022 Free Software Foundation, Inc.
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| 3 |
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| 4 | This program is free software: you can redistribute it and/or modify
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| 5 | it under the terms of the GNU General Public License as published by
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| 6 | the Free Software Foundation, either version 3 of the License, or
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| 7 | (at your option) any later version.
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| 8 |
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| 9 | This program is distributed in the hope that it will be useful,
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 12 | GNU General Public License for more details.
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| 13 |
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| 14 | You should have received a copy of the GNU General Public License
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| 15 | along with this program. If not, see <https://www.gnu.org/licenses/>. */
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| 16 |
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| 17 | #include <config.h>
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| 18 |
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| 19 | #include <stdio.h>
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| 20 |
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| 21 | #include "binary-io.h"
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| 22 | #include "macros.h"
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| 23 |
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| 24 | int
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| 25 | main (int argc, char **argv)
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| 26 | {
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| 27 | int c;
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| 28 |
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| 29 | /* Avoid the well-known bugs of fflush() on streams in O_TEXT mode
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| 30 | on native Windows platforms. */
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| 31 | set_binary_mode (0, O_BINARY);
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| 32 |
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| 33 | if (argc > 1)
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| 34 | switch (argv[1][0])
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| 35 | {
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| 36 | case '1':
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| 37 | /* Check fflush after a backup ungetc() call. This is case 1a in
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| 38 | terms of
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| 39 | <https://lists.gnu.org/r/bug-gnulib/2008-03/msg00131.html>,
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| 40 | according to the Austin Group's resolution on 2009-01-08. */
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| 41 |
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| 42 | c = fgetc (stdin);
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| 43 | ASSERT (c == '#');
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| 44 |
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| 45 | c = fgetc (stdin);
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| 46 | ASSERT (c == '!');
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| 47 |
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| 48 | /* Here the file-position indicator must be 2. */
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| 49 |
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| 50 | c = ungetc ('!', stdin);
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| 51 | ASSERT (c == '!');
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| 52 |
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| 53 | fflush (stdin);
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| 54 |
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| 55 | /* Here the file-position indicator must be 1. */
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| 56 |
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| 57 | c = fgetc (stdin);
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| 58 | ASSERT (c == '!');
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| 59 |
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| 60 | c = fgetc (stdin);
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| 61 | ASSERT (c == '/');
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| 62 |
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| 63 | return 0;
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| 64 |
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| 65 | case '2':
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| 66 | /* Check fflush after a non-backup ungetc() call. This is case 2a in
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| 67 | terms of
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| 68 | <https://lists.gnu.org/r/bug-gnulib/2008-03/msg00131.html>,
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| 69 | according to the Austin Group's resolution on 2009-01-08. */
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| 70 | /* Check that fflush after a non-backup ungetc() call discards the
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| 71 | ungetc buffer. This is mandated by POSIX
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| 72 | <https://pubs.opengroup.org/onlinepubs/9699919799/functions/fflush.html>:
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| 73 | "...any characters pushed back onto the stream by ungetc()
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| 74 | or ungetwc() that have not subsequently been read from the
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| 75 | stream shall be discarded..." */
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| 76 |
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| 77 | c = fgetc (stdin);
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| 78 | ASSERT (c == '#');
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| 79 |
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| 80 | c = fgetc (stdin);
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| 81 | ASSERT (c == '!');
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| 82 |
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| 83 | /* Here the file-position indicator must be 2. */
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| 84 |
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| 85 | c = ungetc ('@', stdin);
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| 86 | ASSERT (c == '@');
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| 87 |
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| 88 | fflush (stdin);
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| 89 |
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| 90 | /* Here the file-position indicator must be 1. */
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| 91 |
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| 92 | c = fgetc (stdin);
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| 93 | ASSERT (c == '!');
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| 94 |
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| 95 | c = fgetc (stdin);
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| 96 | ASSERT (c == '/');
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| 97 |
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| 98 | return 0;
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| 99 | }
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| 100 |
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| 101 | return 1;
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| 102 | }
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