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/* truncate emulations for native Windows.
Copyright (C) 2017-2019 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, see <https://www.gnu.org/licenses/>. */
#include <config.h>
/* Specification. */
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
int
truncate (const char *filename, off_t length)
{
int fd;
if (length == 0)
{
fd = open (filename, O_WRONLY | O_TRUNC);
if (fd < 0)
return -1;
}
else
{
fd = open (filename, O_WRONLY);
if (fd < 0)
return -1;
if (ftruncate (fd, length) < 0)
{
int saved_errno = errno;
close (fd);
errno = saved_errno;
return -1;
}
}
close (fd);
return 0;
}
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