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/* truncate emulations for native Windows.
Copyright (C) 2017-2021 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/>. */
/* If the user's config.h happens to include <unistd.h>, let it include only
the system's <unistd.h> here, so that orig_faccessat doesn't recurse to
rpl_faccessat. */
#define _GL_INCLUDING_UNISTD_H
#include <config.h>
/* Specification. */
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include <sys/stat.h>
#undef _GL_INCLUDING_UNISTD_H
#if TRUNCATE_TRAILING_SLASH_BUG
static int
orig_truncate (const char *filename, off_t length)
{
return truncate (filename, length);
}
#endif
/* Write "unistd.h" here, not <unistd.h>, otherwise OSF/1 5.1 DTK cc
eliminates this include because of the preliminary #include <unistd.h>
above. */
#include "unistd.h"
int
truncate (const char *filename, off_t length)
{
#if TRUNCATE_TRAILING_SLASH_BUG
/* Use the original truncate(), but correct the trailing slash handling. */
size_t len = strlen (filename);
if (len && filename[len - 1] == '/')
{
struct stat st;
if (stat (filename, &st) == 0)
errno = (S_ISDIR (st.st_mode) ? EISDIR : ENOTDIR);
return -1;
}
return orig_truncate (filename, length);
#else
int fd;
if (length == 0)
{
fd = open (filename, O_WRONLY | O_TRUNC | O_CLOEXEC);
if (fd < 0)
return -1;
}
else
{
fd = open (filename, O_WRONLY | O_CLOEXEC);
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;
#endif
}
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