| /* Test of ftello() function. |
| Copyright (C) 2007-2020 Free Software Foundation, Inc. |
| |
| This program is free software: you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 3 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program. If not, see <https://www.gnu.org/licenses/>. */ |
| |
| #include <config.h> |
| |
| /* None of the files accessed by this test are large, so disable the |
| fseek link warning if we are not using the gnulib fseek module. */ |
| #define _GL_NO_LARGE_FILES |
| #include <stdio.h> |
| |
| #include <string.h> |
| |
| #include "macros.h" |
| |
| #define TESTFILE "t-ftello3.tmp" |
| |
| int |
| main (void) |
| { |
| FILE *fp; |
| |
| /* Create a file with some contents. */ |
| fp = fopen (TESTFILE, "w"); |
| if (fp == NULL) |
| goto skip; |
| if (fwrite ("foogarsh", 1, 8, fp) < 8) |
| goto skip; |
| if (fclose (fp)) |
| goto skip; |
| |
| /* The file's contents is now "foogarsh". */ |
| |
| /* Try writing after reading to EOF. */ |
| fp = fopen (TESTFILE, "r+"); |
| if (fp == NULL) |
| goto skip; |
| if (fseek (fp, -1, SEEK_END)) |
| goto skip; |
| ASSERT (getc (fp) == 'h'); |
| ASSERT (getc (fp) == EOF); |
| ASSERT (ftello (fp) == 8); |
| ASSERT (ftello (fp) == 8); |
| ASSERT (putc ('!', fp) == '!'); |
| ASSERT (ftello (fp) == 9); |
| ASSERT (fclose (fp) == 0); |
| fp = fopen (TESTFILE, "r"); |
| if (fp == NULL) |
| goto skip; |
| { |
| char buf[10]; |
| ASSERT (fread (buf, 1, 10, fp) == 9); |
| ASSERT (memcmp (buf, "foogarsh!", 9) == 0); |
| } |
| ASSERT (fclose (fp) == 0); |
| |
| /* The file's contents is now "foogarsh!". */ |
| |
| remove (TESTFILE); |
| return 0; |
| |
| skip: |
| fprintf (stderr, "Skipping test: prerequisite file operations failed.\n"); |
| remove (TESTFILE); |
| return 77; |
| } |