mes/scaffold/tests/97-fopen.c

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/* -*-comment-start: "//";comment-end:""-*-
* Mes --- Maxwell Equations of Software
* Copyright © 2018 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
*
* This file is part of Mes.
*
* Mes 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.
*
* Mes 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 Mes. If not, see <http://www.gnu.org/licenses/>.
*/
#include <libmes.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
int
dump (char const *name, char const* contents)
{
unlink (name);
FILE *f = fopen (name, "w");
fwrite (contents, strlen (contents), 1, f);
fclose (f);
}
int
main ()
{
char *line = "The first line.\n";
char *contents = "The first line.\nThe second line.\nThe last line.\n";
char* end = "That's all folks!\n";
char *tmp = "foo";
dump (tmp, contents);
FILE *t = fopen (tmp, "r+");
char buf[80];
memset (buf, 0, sizeof (buf));
fread (buf, strlen (line), 1, t);
eputs ("buf="); eputs (buf); eputs ("\n");
if (strcmp (buf, line))
return 1;
fwrite (end, strlen (end), 1, t);
fseek (t, 0, SEEK_SET);
memset (buf, 0, sizeof (buf));
fread (buf, strlen (line), 1, t);
eputs ("buf="); eputs (buf); eputs ("\n");
if (strcmp (buf, line))
return 2;
tmp = "bar";
dump (tmp, contents);
t = fopen (tmp, "w+");
fwrite (end, strlen (end), 1, t);
fseek (t, 0, SEEK_SET);
memset (buf, 0, sizeof (buf));
fread (buf, strlen (end), 1, t);
eputs ("buf="); eputs (buf); eputs ("\n");
if (strcmp (buf, end))
return 3;
fwrite (end, strlen (end), 1, t);
fseek (t, 0, SEEK_SET);
memset (buf, 0, sizeof (buf));
fread (buf, strlen (end), 1, t);
if (strcmp (buf, end))
return 4;
tmp = "baz";
dump (tmp, contents);
t = fopen (tmp, "a+");
fwrite (end, strlen (end), 1, t);
fseek (t, 0, SEEK_SET);
memset (buf, 0, sizeof (buf));
fread (buf, strlen (line), 1, t);
eputs ("buf="); eputs (buf); eputs ("\n");
if (strcmp (buf, line))
return 5;
fwrite (end, strlen (end), 1, t);
fseek (t, 0, SEEK_SET);
fread (buf, strlen (line), 1, t);
eputs ("buf="); eputs (buf); eputs ("\n");
if (strcmp (buf, line))
return 6;
return 0;
}