Mercurial > gnulib
view tests/test-fwritable.c @ 40163:b89f4c441767
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author | Bruno Haible <bruno@clisp.org> |
---|---|
date | Mon, 28 Jan 2019 01:20:11 +0100 |
parents | b06060465f09 |
children |
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/* Test of fwritable() function. Copyright (C) 2007-2019 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/>. */ /* 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 "fwritable.h" #include <stdio.h> #include "macros.h" #define TESTFILE "t-fwritable.tmp" int main () { FILE *fp; /* Create a file with some contents. */ fp = fopen (TESTFILE, "w"); if (fp == NULL) goto skip; ASSERT (fwritable (fp)); if (fwrite ("foobarsh", 1, 8, fp) < 8) goto skip; ASSERT (fwritable (fp)); if (fclose (fp)) goto skip; /* Open it in read-only mode. */ fp = fopen (TESTFILE, "r"); if (fp == NULL) goto skip; ASSERT (!fwritable (fp)); if (fgetc (fp) != 'f') goto skip; ASSERT (!fwritable (fp)); if (fseek (fp, 2, SEEK_CUR)) goto skip; ASSERT (!fwritable (fp)); if (fgetc (fp) != 'b') goto skip; ASSERT (!fwritable (fp)); fflush (fp); ASSERT (!fwritable (fp)); if (fgetc (fp) != 'a') goto skip; ASSERT (!fwritable (fp)); if (fseek (fp, 0, SEEK_END)) goto skip; ASSERT (!fwritable (fp)); if (fclose (fp)) goto skip; /* Open it in read-write mode. */ fp = fopen (TESTFILE, "r+"); if (fp == NULL) goto skip; ASSERT (fwritable (fp)); if (fgetc (fp) != 'f') goto skip; ASSERT (fwritable (fp)); if (fseek (fp, 2, SEEK_CUR)) goto skip; ASSERT (fwritable (fp)); if (fgetc (fp) != 'b') goto skip; ASSERT (fwritable (fp)); fflush (fp); ASSERT (fwritable (fp)); if (fgetc (fp) != 'a') goto skip; ASSERT (fwritable (fp)); if (fputc ('z', fp) != 'z') goto skip; ASSERT (fwritable (fp)); if (fseek (fp, 0, SEEK_END)) goto skip; ASSERT (fwritable (fp)); if (fclose (fp)) goto skip; /* Open it in append mode. */ fp = fopen (TESTFILE, "a"); if (fp == NULL) goto skip; ASSERT (fwritable (fp)); if (fwrite ("bla", 1, 3, fp) < 3) goto skip; ASSERT (fwritable (fp)); if (fclose (fp)) goto skip; return 0; skip: fprintf (stderr, "Skipping test: file operations failed.\n"); return 77; }