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/* Test program for ungetc/fseekpos interaction.
Copyright (C) 2004-2023 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 <stdio.h>
#include <support/xunistd.h>
static void do_prepare (void);
#define PREPARE(argc, argv) do_prepare ()
static int do_test (void);
#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"
static const char pattern[] = "abcdefghijklmnopqrstuvwxyz";
static char *temp_file;
static void
do_prepare (void)
{
int fd = create_temp_file ("bug-ungetc.", &temp_file);
if (fd == -1)
{
printf ("cannot create temporary file: %m\n");
exit (1);
}
xwrite (fd, pattern, sizeof (pattern) - 1);
close (fd);
}
#define TEST_POS 5
static int
do_one_test (int mode)
{
FILE *f = fopen (temp_file, "r");
if (f == NULL)
{
printf ("%d: could not open temporary file: %m\n", mode);
return 1;
}
int i;
for (i = 0; i < TEST_POS; ++i)
getc (f);
fpos_t p;
if (fgetpos (f, &p) != 0)
{
printf ("%d: fgetpos failed: %m\n", mode);
return 1;
}
if (mode)
{
if (fseek (f, 0, SEEK_SET) != 0)
{
printf ("%d: fseek failed: %m\n", mode);
return 1;
}
for (i = 0; i < TEST_POS - (mode >= 2); ++i)
getc (f);
}
if (mode != 2 && ungetc ('X', f) != 'X')
{
printf ("%d: ungetc failed\n", mode);
return 1;
}
if (mode == 3 && getc (f) != 'X')
{
printf ("%d: getc after ungetc did not return X\n", mode);
return 1;
}
if (fsetpos (f, &p) != 0)
{
printf ("%d: fsetpos failed: %m\n", mode);
return 1;
}
if (getc (f) != pattern[TEST_POS])
{
printf ("%d: getc did not return %c\n", mode, pattern[TEST_POS]);
return 1;
}
fclose (f);
return 0;
}
static int
do_test (void)
{
int mode, ret = 0;
for (mode = 0; mode <= 4; mode++)
ret |= do_one_test (mode);
return ret;
}
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