| /* Test of fseeko() function. |
| Copyright (C) 2007-2016 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 <http://www.gnu.org/licenses/>. */ |
| |
| /* Written by Bruno Haible <bruno@clisp.org>, 2007. */ |
| |
| #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 "signature.h" |
| SIGNATURE_CHECK (fseeko, int, (FILE *, off_t, int)); |
| |
| |
| #include "macros.h" |
| |
| #ifndef FUNC_UNGETC_BROKEN |
| # define FUNC_UNGETC_BROKEN 0 |
| #endif |
| |
| int |
| main (int argc, char **argv _GL_UNUSED) |
| { |
| /* Assume stdin is non-empty, seekable, and starts with '#!/bin/sh' |
| iff argc > 1. */ |
| int expected = argc > 1 ? 0 : -1; |
| /* Exit with success only if fseek/fseeko agree. */ |
| int r1 = fseeko (stdin, 0, SEEK_CUR); |
| int r2 = fseek (stdin, 0, SEEK_CUR); |
| ASSERT (r1 == r2 && r1 == expected); |
| if (argc > 1) |
| { |
| /* Test that fseek discards previously read ungetc data. */ |
| int ch = fgetc (stdin); |
| ASSERT (ch == '#'); |
| ASSERT (ungetc (ch, stdin) == ch); |
| ASSERT (fseeko (stdin, 2, SEEK_SET) == 0); |
| ch = fgetc (stdin); |
| ASSERT (ch == '/'); |
| if (2 < argc) |
| { |
| if (FUNC_UNGETC_BROKEN) |
| { |
| fputs ("Skipping test: ungetc cannot handle arbitrary bytes\n", |
| stderr); |
| return 77; |
| } |
| /* Test that fseek discards random ungetc data. */ |
| ASSERT (ungetc (ch ^ 0xff, stdin) == (ch ^ 0xff)); |
| } |
| ASSERT (fseeko (stdin, 0, SEEK_END) == 0); |
| ASSERT (fgetc (stdin) == EOF); |
| /* Test that fseek resets end-of-file marker. */ |
| ASSERT (feof (stdin)); |
| ASSERT (fseeko (stdin, 0, SEEK_END) == 0); |
| ASSERT (!feof (stdin)); |
| } |
| return 0; |
| } |