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/*
* Copyright (C) 2026 Daniel Golle <daniel@makrotopia.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 2.1
* as published by the Free Software Foundation
*
* 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.
*/
#ifndef __STATE_FILE_H
#define __STATE_FILE_H
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
static inline int fd_write_all(int fd, const char *buf, size_t len)
{
ssize_t ret;
while (len) {
ret = write(fd, buf, len);
if (ret < 0)
return errno;
buf += ret;
len -= ret;
}
return 0;
}
static inline int file_write_atomic(const char *path, const char *buf, size_t len, mode_t mode)
{
char tmp[PATH_MAX];
int fd, err;
if (snprintf(tmp, sizeof(tmp), "%s.XXXXXX", path) >= (int)sizeof(tmp))
return -ENAMETOOLONG;
fd = mkstemp(tmp);
if (fd < 0)
return -errno;
err = 0;
if (fchmod(fd, mode))
err = errno;
if (!err)
err = fd_write_all(fd, buf, len);
if (close(fd) && !err)
err = errno;
if (!err && rename(tmp, path))
err = errno;
if (!err)
return 0;
unlink(tmp);
return -err;
}
#endif
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