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/* fmemopen tests.
Copyright (C) 2015-2025 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 <assert.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <stdint.h>
#include <errno.h>
/* Check fmemopen with user provided buffer open for write. */
static int
do_test_with_buffer (void)
{
int result = 0;
char buf[100];
const size_t nbuf = sizeof (buf);
FILE *fp = fmemopen (buf, nbuf, "w");
if (fp == NULL)
{
printf ("FAIL: fmemopen failed (%s)\n", __FUNCTION__);
return 1;
}
/* Default write operation, check if file position is correct after it. */
static const char str[] = "hello world";
const size_t nstr = sizeof (str) - 1;
fputs (str, fp);
off_t o = ftello (fp);
if (o != nstr)
{
printf ("FAIL: first ftello returned %jd, expected %zu\n",
(intmax_t)o, nstr);
result = 1;
}
/* Rewind stream and seek tests, the position size should be equal to
buffer size provided in open function. */
rewind (fp);
o = ftello (fp);
if (o != 0)
{
printf ("FAIL: second ftello returned %jd, expected 0\n",
(intmax_t)o);
result = 1;
}
if (fseeko (fp, 0, SEEK_END) != 0)
{
printf ("FAIL: fseeko failed\n");
result = 1;
}
o = ftello (fp);
if (o != nstr)
{
printf ("FAIL: third ftello returned %jd, expected %zu\n",
(intmax_t)o, nstr);
result = 1;
}
/* Rewind the stream and recheck by using a shorter string. */
rewind (fp);
static const char str2[] = "just hello";
const size_t nstr2 = sizeof (str2) - 1;
assert (nstr2 < nstr);
fputs (str2, fp);
o = ftello (fp);
if (o != nstr2)
{
printf ("FAIL: fourth ftello returned %jd, expected %zu\n",
(intmax_t)o, nstr2);
result = 1;
}
fclose (fp);
/* Again, but now with a larger string. */
static const char str3[] = "just hellod";
if (strcmp (buf, str3) != 0)
{
printf ("FAIL: final string is \"%s\", expected \"%s\"\n",
buf, str3);
result = 1;
}
return result;
}
/* Check fmemopen without user provided buffer open for write. */
static int
do_test_without_buffer (void)
{
int result = 0;
const size_t nbuf = 100;
FILE *fp = fmemopen (NULL, nbuf, "w");
if (fp == NULL)
{
printf ("FAIL: fmemopen failed (%s)\n", __FUNCTION__);
return 1;
}
static const char str[] = "hello world";
const size_t nstr = sizeof (str) - 1;
/* Default write operation, check if file position is correct after it. */
fputs (str, fp);
off_t o = ftello (fp);
if (o != nstr)
{
printf ("FAIL: first ftello returned %jd, expected %zu\n",
(intmax_t) o, nstr);
result = 1;
}
if (fseeko (fp, 0, SEEK_END) != 0)
{
printf ("FAIL: fseeko failed\n");
result = 1;
}
o = ftello (fp);
if (o != nstr)
{
printf ("FAIL: second ftello returned %jd, expected %zu\n",
(intmax_t) o, nbuf);
result = 1;
}
/* Rewind the stream and recheck by using a shorter string. */
rewind (fp);
static const char str2[] = "just hello";
const size_t nstr2 = sizeof (str2) - 1;
assert (nstr2 < nstr);
fputs (str2, fp);
o = ftello (fp);
if (o != nstr2)
{
printf ("FAIL: third ftello returned %jd, expected %zu\n",
(intmax_t) o, nstr2);
result = 1;
}
fclose (fp);
return result;
}
/* Check fmemopen with a buffer length of zero. */
static int
do_test_length_zero (void)
{
int result = 0;
FILE *fp;
#define BUFCONTENTS "testing buffer"
char buf[100] = BUFCONTENTS;
const size_t nbuf = 0;
int r;
fp = fmemopen (buf, nbuf, "r");
if (fp == NULL)
{
printf ("FAIL: fmemopen failed (%s)\n", __FUNCTION__);
return 1;
}
/* Reading any data on a zero-length buffer should return EOF. */
if ((r = fgetc (fp)) != EOF)
{
printf ("FAIL: fgetc on a zero-length returned: %d\n", r);
result = 1;
}
off_t o = ftello (fp);
if (o != 0)
{
printf ("FAIL: first ftello returned %jd, expected 0\n",
(intmax_t) o);
result = 1;
}
fclose (fp);
/* Writing any data shall start at current position and shall not pass
current buffer size beyond the size in fmemopen call. */
fp = fmemopen (buf, nbuf, "w");
if (fp == NULL)
{
printf ("FAIL: second fmemopen failed (%s)\n", __FUNCTION__);
return 1;
}
static const char str[] = "hello world";
/* Because of buffering, the fputs call itself will not fail. However the
final buffer should be not changed because length 0 was passed to the
fmemopen call. */
fputs (str, fp);
r = 0;
errno = 0;
if (fflush (fp) != EOF)
{
printf ("FAIL: fflush did not return EOF\n");
fclose (fp);
return 1;
}
if (errno != ENOSPC)
{
printf ("FAIL: errno is %i (expected ENOSPC)\n", errno);
fclose (fp);
return 1;
}
fclose (fp);
if (strcmp (buf, BUFCONTENTS) != 0)
{
printf ("FAIL: strcmp (%s, %s) failed\n", buf, BUFCONTENTS);
return 1;
}
/* Different than 'w' mode, 'w+' truncates the buffer. */
fp = fmemopen (buf, nbuf, "w+");
if (fp == NULL)
{
printf ("FAIL: third fmemopen failed (%s)\n", __FUNCTION__);
return 1;
}
fclose (fp);
if (strcmp (buf, "") != 0)
{
printf ("FAIL: strcmp (%s, \"\") failed\n", buf);
return 1;
}
return result;
}
static int
do_test (void)
{
int ret = 0;
ret += do_test_with_buffer ();
ret += do_test_without_buffer ();
ret += do_test_length_zero ();
return ret;
}
#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"
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