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/* fmemopen tests for append and read mode.
Copyright (C) 2015-2016 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
<http://www.gnu.org/licenses/>. */
#include <assert.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
static void
print_buffer (const char *s, size_t n)
{
size_t i;
for (i=0; i<n; ++i)
printf ("0x%02X (%c), ", s[i], s[i]);
}
/* This test check append mode initial position (a/a+) based on POSIX defition
(BZ#6544 and BZ#13151). */
static int
do_test_write_append (const char *mode)
{
char buf[32] = "testing buffer";
char exp[32] = "testing bufferXX";
FILE *fp = fmemopen (buf, sizeof (buf), mode);
fflush (fp);
fprintf (fp, "X");
fseek (fp, 0, SEEK_SET);
fprintf (fp, "X");
fclose (fp);
if (strcmp (buf, exp) != 0)
{
printf ("%s: check failed: %s != %s\n", __FUNCTION__, buf, exp);
return 1;
}
return 0;
}
/* This test check append mode initial position (a/a+) based on POSIX defition
(BZ#6544 and BZ#13151) for buffer without null byte end. */
static int
do_test_write_append_without_null (const char *mode)
{
char buf[] = { 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55 };
char exp[] = { 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55 };
/* If '\0' is not found in buffer, POSIX states that SEEK_SET should be
the size argument. */
FILE *fp = fmemopen (buf, sizeof (buf) - 2, "a");
fflush (fp);
fputc (0x70, fp);
fseek (fp, 0, SEEK_SET);
fputc (0x70, fp);
fputc (0x70, fp);
fclose (fp);
/* POSIX also states that a write operation on the stream shall not advance
the current buffer size beyond the size given in fmemopen, so the string
should be same. */
if (memcmp (buf, exp, sizeof (buf)) != 0)
{
printf ("%s: check failed: ", __FUNCTION__);
print_buffer (buf, sizeof (buf));
printf ("!= ");
print_buffer (exp, sizeof (exp));
printf ("\n");
return 1;
}
return 0;
}
/* This test check for initial position and feek value for fmemopen objects
opened with append mode. */
static int
do_test_read_append (void)
{
char buf[32] = "testing buffer";
size_t buflen = strlen (buf);
long fpos;
/* POSIX defines for 'a+' the initial position is the first null byte. */
FILE *fp = fmemopen (buf, sizeof (buf), "a+");
fpos = ftell (fp);
if (fpos != buflen)
{
printf ("%s: ftell|SEEK_SET (fp) %li != strlen (%s) %zu\n",
__FUNCTION__, fpos, buf, buflen);
fclose (fp);
return 1;
}
fseek (fp, 0, SEEK_END);
if (fpos != buflen)
{
printf ("%s: ftell|SEEK_END (fp) %li != strlen (%s) %zu\n",
__FUNCTION__, fpos, buf, buflen);
fclose (fp);
return 1;
}
fclose (fp);
/* Check if attempting to read past the current size, defined as strlen (buf)
yield an EOF. */
fp = fmemopen (buf, sizeof (buf), "a+");
if (getc(fp) != EOF)
{
printf ("%s: getc(fp) != EOF\n", __FUNCTION__);
fclose (fp);
return -1;
}
fclose (fp);
return 0;
}
/* This test check for fseek (SEEK_END) using negative offsets (BZ#14292). The
starting position of descriptor is different base on the opening mode. */
static int
do_test_read_seek_neg (const char *mode, const char *expected)
{
char buf[] = "abcdefghijklmnopqrstuvxz0123456789";
char tmp[10];
size_t tmps = sizeof (tmps);
long offset = -11;
FILE *fp = fmemopen (buf, sizeof (buf), mode);
fseek (fp, offset, SEEK_END);
fread (tmp, tmps, 1, fp);
if (memcmp (tmp, expected, tmps) != 0)
{
printf ("%s: fmemopen(%s) - fseek (fp, %li, SEEK_END):\n",
__FUNCTION__, mode, offset);
printf (" returned: ");
print_buffer (tmp, tmps);
printf ("\n");
printf (" expected: ");
print_buffer (expected, tmps);
printf ("\n");
return 1;
}
fclose (fp);
return 0;
}
static int
do_test_read_seek_negative (void)
{
int ret = 0;
/* 'r' and 'w' modes defines the initial position at the buffer start and
seek with SEEK_END shall seek relative to its size give in fmemopen
call. The expected tmp result is 0 to 9 *without* the ending null */
ret += do_test_read_seek_neg ("r", "0123456789");
/* 'a+' mode sets the initial position at the first null byte in buffer and
SEEK_END shall seek relative to its size as well. The expected result is
z012345678, since SEEK_END plus a+ start at '\0', not size. */
ret += do_test_read_seek_neg ("a+", "z012345678");
return ret;
}
static int
do_test (void)
{
int ret = 0;
ret += do_test_write_append ("a");
ret += do_test_write_append_without_null ("a");
ret += do_test_write_append ("a+");
ret += do_test_write_append_without_null ("a+");
ret += do_test_read_append ();
ret += do_test_read_seek_negative ();
return ret;
}
#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"
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