embox

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/**
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 * @file
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 *
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 * @date 06.08.09
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 * @author Anton Bondarev
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 */
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#include <stddef.h>
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#include <stdio.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include <fs/inode.h>
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#include <fs/file_desc.h>
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#include <fs/kfile.h>
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#include <fs/kfsop.h>
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ssize_t kwrite(struct file_desc *file, const void *buf, size_t size) {
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	ssize_t ret;
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	if (!file) {
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		ret = -EBADF;
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		goto end;
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	}
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	if (idesc_check_mode(&file->f_idesc, O_RDONLY)) {
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		ret = -EBADF;
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		goto end;
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	}
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	if (NULL == file->f_ops->write) {
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		ret = -EBADF;
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		goto end;
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	}
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	ret = file->f_ops->write(file, (void *)buf, size);
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	if (ret > 0) {
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		file_set_pos(file, file_get_pos(file) + ret);
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	}
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end:
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	return ret;
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}
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ssize_t kread(struct file_desc *desc, void *buf, size_t size) {
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	ssize_t ret;
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	if (NULL == desc) {
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		ret = -EBADF;
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		goto end;
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	}
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	if (idesc_check_mode(&desc->f_idesc, O_WRONLY)) {
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		ret = -EBADF;
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		goto end;
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	}
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	if (NULL == desc->f_ops->read) {
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		ret = -EBADF;
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		goto end;
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	}
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	/* Don't try to read past EOF */
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	if (size > desc->f_inode->i_size - file_get_pos(desc)) {
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		size = desc->f_inode->i_size - file_get_pos(desc);
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	}
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	ret = desc->f_ops->read(desc, buf, size);
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	if (ret > 0) {
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		file_set_pos(desc, file_get_pos(desc) + ret);
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	}
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end:
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	return ret;
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}
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void kclose(struct file_desc *desc) {
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	assert(desc);
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	assert(desc->f_ops);
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	if (desc->f_ops->close) {
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		desc->f_ops->close(desc);
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	}
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	file_desc_destroy(desc);
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}
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int kfstat(struct file_desc *desc, struct stat *stat_buff) {
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	if ((NULL == desc) || (stat_buff == NULL)) {
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		return -EBADF;
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	}
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	kfile_fill_stat(desc->f_inode, stat_buff);
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	return 0;
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}
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int kioctl(struct file_desc *desc, int request, void *data) {
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	int ret;
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	if (NULL == desc) {
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		return -EBADF;
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	}
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	if (NULL == desc->f_ops->ioctl) {
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		return -ENOSUPP;
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	}
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	ret = desc->f_ops->ioctl(desc, request, data);
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	if (ret < 0) {
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		return ret;
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	}
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	return 0;
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}
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