| 1 | /* Test of ftell() function.
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| 2 | Copyright (C) 2007-2022 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 | /* Written by Bruno Haible <bruno@clisp.org>, 2007. */
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| 18 |
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| 19 | #include <config.h>
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| 20 |
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| 21 | /* None of the files accessed by this test are large, so disable the
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| 22 | fseek link warning if we are not using the gnulib fseek module. */
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| 23 | #define _GL_NO_LARGE_FILES
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| 24 | #include <stdio.h>
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| 25 |
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| 26 | #include "signature.h"
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| 27 | SIGNATURE_CHECK (ftell, long, (FILE *));
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| 28 |
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| 29 | #include "binary-io.h"
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| 30 | #include "macros.h"
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| 31 |
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| 32 | #ifndef FUNC_UNGETC_BROKEN
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| 33 | # define FUNC_UNGETC_BROKEN 0
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| 34 | #endif
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| 35 |
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| 36 | int
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| 37 | main (int argc, char **argv)
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| 38 | {
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| 39 | int ch;
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| 40 | /* Assume stdin is seekable iff argc > 1. */
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| 41 | if (argc == 1)
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| 42 | {
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| 43 | ASSERT (ftell (stdin) == -1);
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| 44 | return 0;
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| 45 | }
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| 46 |
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| 47 | /* mingw ftell is unreliable on text mode input. */
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| 48 | set_binary_mode (0, O_BINARY);
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| 49 |
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| 50 | /* Simple tests. */
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| 51 | ASSERT (ftell (stdin) == 0);
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| 52 |
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| 53 | ch = fgetc (stdin);
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| 54 | ASSERT (ch == '#');
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| 55 | ASSERT (ftell (stdin) == 1);
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| 56 |
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| 57 | /* Test ftell after ungetc of read input. */
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| 58 | ch = ungetc ('#', stdin);
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| 59 | ASSERT (ch == '#');
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| 60 | ASSERT (ftell (stdin) == 0);
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| 61 |
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| 62 | ch = fgetc (stdin);
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| 63 | ASSERT (ch == '#');
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| 64 | ASSERT (ftell (stdin) == 1);
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| 65 |
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| 66 | /* Test ftell after fseek. */
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| 67 | ASSERT (fseek (stdin, 2, SEEK_SET) == 0);
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| 68 | ASSERT (ftell (stdin) == 2);
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| 69 |
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| 70 | /* Test ftell after random ungetc. */
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| 71 | ch = fgetc (stdin);
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| 72 | ASSERT (ch == '/');
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| 73 | ch = ungetc ('@', stdin);
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| 74 | ASSERT (ch == '@');
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| 75 | ASSERT (ftell (stdin) == 2);
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| 76 |
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| 77 | ch = fgetc (stdin);
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| 78 | ASSERT (ch == '@');
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| 79 | ASSERT (ftell (stdin) == 3);
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| 80 |
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| 81 | if (2 < argc)
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| 82 | {
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| 83 | if (FUNC_UNGETC_BROKEN)
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| 84 | {
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| 85 | fputs ("Skipping test: ungetc cannot handle arbitrary bytes\n",
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| 86 | stderr);
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| 87 | return 77;
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| 88 | }
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| 89 | /* Test ftell after ungetc without read. */
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| 90 | ASSERT (fseek (stdin, 0, SEEK_CUR) == 0);
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| 91 | ASSERT (ftell (stdin) == 3);
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| 92 |
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| 93 | ch = ungetc ('~', stdin);
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| 94 | ASSERT (ch == '~');
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| 95 | ASSERT (ftell (stdin) == 2);
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| 96 | }
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| 97 |
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| 98 | #if !defined __MINT__ /* FreeMiNT has problems seeking past end of file */
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| 99 | /* Test ftell beyond end of file. */
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| 100 | ASSERT (fseek (stdin, 0, SEEK_END) == 0);
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| 101 | ch = ftell (stdin);
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| 102 | ASSERT (fseek (stdin, 10, SEEK_END) == 0);
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| 103 | ASSERT (ftell (stdin) == ch + 10);
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| 104 | #endif
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| 105 |
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| 106 | return 0;
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| 107 | }
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