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/* Copyright (C) 1991-2025 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <libc-diag.h>
#include <support/xstdio.h>
int
main (int argc, char **argv)
{
static const char hello[] = "Hello, world.\n";
static const char replace[] = "Hewwo, world.\n";
static const size_t replace_from = 2, replace_to = 4;
char filename[FILENAME_MAX];
char *name = strrchr (*argv, '/');
char buf[BUFSIZ];
FILE *f;
int lose = 0;
if (name != NULL)
++name;
else
name = *argv;
(void) sprintf (filename, OBJPFX "%s.test", name);
f = fopen (filename, "w+");
if (f == NULL)
{
perror (filename);
exit (1);
}
(void) fputs (hello, f);
rewind (f);
xfgets (buf, sizeof (buf), f);
rewind (f);
(void) fputs (buf, f);
rewind (f);
/* clang do not handle %Z format. */
DIAG_PUSH_NEEDS_COMMENT_CLANG;
DIAG_IGNORE_NEEDS_COMMENT_CLANG (13, "-Wformat-invalid-specifier");
DIAG_IGNORE_NEEDS_COMMENT_CLANG (13, "-Wformat-extra-args");
{
size_t i;
for (i = 0; i < replace_from; ++i)
{
int c = getc (f);
if (c == EOF)
{
printf ("EOF at %Zu.\n", i);
lose = 1;
break;
}
else if (c != hello[i])
{
printf ("Got '%c' instead of '%c' at %Zu.\n",
(unsigned char) c, hello[i], i);
lose = 1;
break;
}
}
}
{
long int where = ftell (f);
if (where == (long int) replace_from)
{
size_t i;
for (i = replace_from; i < replace_to; ++i)
if (putc(replace[i], f) == EOF)
{
printf ("putc('%c') got %s at %Zu.\n",
replace[i], strerror (errno), i);
lose = 1;
break;
}
}
else if (where == -1L)
{
printf ("ftell got %s (should be at %Zu).\n",
strerror (errno), replace_from);
lose = 1;
}
else
{
printf ("ftell returns %lu; should be %Zu.\n", where, replace_from);
lose = 1;
}
}
DIAG_POP_NEEDS_COMMENT_CLANG;
if (!lose)
{
rewind (f);
xfgets (buf, sizeof (buf), f);
if (strcmp (buf, replace))
{
printf ("Read \"%s\" instead of \"%s\".\n", buf, replace);
lose = 1;
}
}
if (lose)
printf ("Test FAILED! Losing file is \"%s\".\n", filename);
else
{
(void) remove (filename);
puts ("Test succeeded.");
}
return lose ? EXIT_FAILURE : EXIT_SUCCESS;
}
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