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/* Test for some *_unlocked stdio interfaces.
Copyright (C) 2004-2025 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 <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <libc-diag.h>
int fd;
static void do_prepare (void);
static int do_test (void);
#define PREPARE(argc, argv) do_prepare ()
#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"
static int
do_test (void)
{
const char blah[] = "BLAH";
DIAG_PUSH_NEEDS_COMMENT_CLANG;
DIAG_IGNORE_NEEDS_COMMENT_CLANG (3.4, "-Wgnu-folding-constant");
char buf[strlen (blah) + 1];
DIAG_POP_NEEDS_COMMENT_CLANG;
FILE *fp, *f;
const char *cp;
char *wp;
if ((fp = fdopen (fd, "w+")) == NULL)
exit (1);
flockfile (fp);
f = fp;
cp = blah;
/* These tests deliberately use fwrite_unlocked with the size
argument specified as 0, which results in "division by zero"
warnings from the expansion of that macro (in code that is not
evaluated for a size of 0). This applies to the tests of
fread_unlocked below as well. */
DIAG_PUSH_NEEDS_COMMENT;
DIAG_IGNORE_NEEDS_COMMENT (4.9, "-Wdiv-by-zero");
/* clang warns about the implicit conversion from double to size_t,
which is required by this tests. */
DIAG_IGNORE_NEEDS_COMMENT_CLANG (13, "-Wliteral-conversion");
if (ftello (fp) != 0
|| fwrite_unlocked (blah, blah - blah, strlen (blah), f++) != 0
|| f != fp + 1
|| fwrite_unlocked ("", 5.0, 0, --f) != 0
|| f != fp
|| fwrite_unlocked (cp++, 16, 0.25, fp) != 0
|| cp != blah + 1
|| fwrite_unlocked (--cp, 0.25, 16, fp) != 0
|| cp != blah
|| fwrite_unlocked (blah, 0, -0.0, fp) != 0
|| ftello (fp) != 0)
{
puts ("One of fwrite_unlocked tests failed");
exit (1);
}
DIAG_POP_NEEDS_COMMENT;
if (fwrite_unlocked (blah, 1, strlen (blah) - 2, fp) != strlen (blah) - 2)
{
puts ("Could not write string into file");
exit (1);
}
if (putc_unlocked ('A' + 0x1000000, fp) != 'A')
{
puts ("putc_unlocked failed");
exit (1);
}
f = fp;
cp = blah + strlen (blah) - 1;
if (putc_unlocked (*cp++, f++) != 'H'
|| f != fp + 1
|| cp != strchr (blah, '\0'))
{
puts ("fputc_unlocked failed");
exit (1);
}
if (ftello (fp) != (off_t) strlen (blah))
{
printf ("Failed to write %zd bytes to temporary file", strlen (blah));
exit (1);
}
rewind (fp);
f = fp;
wp = buf;
memset (buf, ' ', sizeof (buf));
/* See explanation above. */
DIAG_PUSH_NEEDS_COMMENT;
DIAG_IGNORE_NEEDS_COMMENT (4.9, "-Wdiv-by-zero");
DIAG_IGNORE_NEEDS_COMMENT_CLANG (13, "-Wliteral-conversion");
if (ftello (fp) != 0
|| fread_unlocked (buf, buf - buf, strlen (blah), f++) != 0
|| f != fp + 1
|| fread_unlocked (buf, 5.0, 0, --f) != 0
|| f != fp
|| fread_unlocked (wp++, 16, 0.25, fp) != 0
|| wp != buf + 1
|| fread_unlocked (--wp, 0.25, 16, fp) != 0
|| wp != buf
|| fread_unlocked (buf, 0, -0.0, fp) != 0
|| ftello (fp) != 0
|| memcmp (buf, " ", sizeof (buf)) != 0)
{
puts ("One of fread_unlocked tests failed");
exit (1);
}
DIAG_POP_NEEDS_COMMENT;
if (fread_unlocked (buf, 1, strlen (blah) - 2, fp) != strlen (blah) - 2)
{
puts ("Could not read string from file");
exit (1);
}
if (getc_unlocked (fp) != 'A')
{
puts ("getc_unlocked failed");
exit (1);
}
f = fp;
if (fgetc_unlocked (f++) != 'H'
|| f != fp + 1
|| fgetc_unlocked (--f) != EOF
|| f != fp)
{
puts ("fgetc_unlocked failed");
exit (1);
}
if (ftello (fp) != (off_t) strlen (blah))
{
printf ("Failed to read %zd bytes from temporary file", strlen (blah));
exit (1);
}
funlockfile (fp);
fclose (fp);
return 0;
}
static void
do_prepare (void)
{
fd = create_temp_file ("tst-unlockedio.", NULL);
if (fd == -1)
{
printf ("cannot create temporary file: %m\n");
exit (1);
}
}
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