| 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 | #include <config.h>
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| 18 |
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| 19 | /* None of the files accessed by this test are large, so disable the
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| 20 | fseek link warning if we are not using the gnulib fseek module. */
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| 21 | #define _GL_NO_LARGE_FILES
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| 22 | #include <stdio.h>
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| 23 |
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| 24 | #include <string.h>
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| 25 |
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| 26 | #include "macros.h"
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| 27 |
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| 28 | #define TESTFILE "t-ftell3.tmp"
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| 29 |
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| 30 | int
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| 31 | main (void)
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| 32 | {
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| 33 | FILE *fp;
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| 34 |
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| 35 | /* Create a file with some contents. */
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| 36 | fp = fopen (TESTFILE, "w");
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| 37 | if (fp == NULL)
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| 38 | goto skip;
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| 39 | if (fwrite ("foogarsh", 1, 8, fp) < 8)
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| 40 | goto skip;
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| 41 | if (fclose (fp))
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| 42 | goto skip;
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| 43 |
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| 44 | /* The file's contents is now "foogarsh". */
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| 45 |
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| 46 | /* Try writing after reading to EOF. */
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| 47 | fp = fopen (TESTFILE, "r+");
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| 48 | if (fp == NULL)
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| 49 | goto skip;
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| 50 | if (fseek (fp, -1, SEEK_END))
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| 51 | goto skip;
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| 52 | ASSERT (getc (fp) == 'h');
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| 53 | ASSERT (getc (fp) == EOF);
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| 54 | ASSERT (ftell (fp) == 8);
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| 55 | ASSERT (ftell (fp) == 8);
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| 56 | ASSERT (putc ('!', fp) == '!');
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| 57 | ASSERT (ftell (fp) == 9);
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| 58 | ASSERT (fclose (fp) == 0);
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| 59 | fp = fopen (TESTFILE, "r");
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| 60 | if (fp == NULL)
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| 61 | goto skip;
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| 62 | {
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| 63 | char buf[10];
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| 64 | ASSERT (fread (buf, 1, 10, fp) == 9);
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| 65 | ASSERT (memcmp (buf, "foogarsh!", 9) == 0);
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| 66 | }
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| 67 | ASSERT (fclose (fp) == 0);
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| 68 |
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| 69 | /* The file's contents is now "foogarsh!". */
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| 70 |
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| 71 | remove (TESTFILE);
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| 72 | return 0;
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| 73 |
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| 74 | skip:
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| 75 | fprintf (stderr, "Skipping test: prerequisite file operations failed.\n");
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| 76 | remove (TESTFILE);
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| 77 | return 77;
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| 78 | }
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