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/*
*
* Embedded Linux library
*
* Copyright (C) 2017 Intel Corporation. All rights reserved.
*
* This 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.
*
* This 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 this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#define _GNU_SOURCE
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include "file.h"
#include "private.h"
/**
* l_file_get_contents:
* @filename: File to load
* @out_len: Set to the length of the loaded file
*
* Attempts to load the contents of a file via sequential read system calls.
* This can be useful for files that are not mmapable, e.g. sysfs entries.
*
* Returns: A newly allocated memory region with the file contents
**/
LIB_EXPORT void *l_file_get_contents(const char *filename, size_t *out_len)
{
int fd;
struct stat st;
uint8_t *contents;
size_t bytes_read = 0;
ssize_t nread;
fd = open(filename, O_RDONLY);
if (fd < 0)
return NULL;
if (fstat(fd, &st) < 0) {
close(fd);
return NULL;
}
contents = l_malloc(st.st_size);
do {
nread = read(fd, contents + bytes_read, 4096);
if (nread < 0) {
if (errno == EINTR)
continue;
goto error;
}
bytes_read += nread;
} while (nread != 0);
if (out_len)
*out_len = bytes_read;
close(fd);
return contents;
error:
l_free(contents);
close(fd);
return NULL;
}
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