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/*
* Copyright (c) 2006-2025 RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
*/
#ifndef __DFS_SEQ_FILE_H__
#define __DFS_SEQ_FILE_H__
#include <dfs.h>
#include <dfs_fs.h>
struct dfs_seq_ops;
/**
* Sequence file control structure
*/
struct dfs_seq_file
{
char *buf; /* Data buffer pointer */
size_t size; /* Total buffer size in bytes */
size_t from; /* Start offset of valid data in buffer */
size_t count; /* Length of valid data in buffer */
size_t pad_until; /* Padding target position for alignment */
off_t index; /* Current item index in sequence */
off_t read_pos; /* Current read position in file */
struct rt_mutex lock; /* Mutex for thread safety */
const struct dfs_seq_ops *ops; /* Operation function table */
const struct dfs_file *file; /* Associated file object */
void *data; /* Private data pointer */
};
/**
* Sequence file operations structure
*/
struct dfs_seq_ops
{
void *(*start)(struct dfs_seq_file *seq, off_t *index); /* Start sequence traversal */
void (*stop)(struct dfs_seq_file *seq, void *data); /* Stop sequence traversal */
void *(*next)(struct dfs_seq_file *seq, void *data, off_t *index); /* Get next item in sequence */
int (*show)(struct dfs_seq_file *seq, void *data); /* Show current item */
};
/**
* check if the buffer is full
*/
static inline rt_bool_t dfs_seq_is_full(struct dfs_seq_file *seq)
{
return seq->count == seq->size;
}
/**
* set padding width size
*/
static inline void dfs_seq_setwidth(struct dfs_seq_file *seq, size_t size)
{
seq->pad_until = seq->count + size;
}
int dfs_seq_open(struct dfs_file *file, const struct dfs_seq_ops *ops);
ssize_t dfs_seq_read(struct dfs_file *file, void *buf, size_t size, off_t *pos);
off_t dfs_seq_lseek(struct dfs_file *file, off_t offset, int whence);
int dfs_seq_release(struct dfs_file *file);
int dfs_seq_write(struct dfs_seq_file *seq, const void *data, size_t len);
void dfs_seq_vprintf(struct dfs_seq_file *seq, const char *fmt, va_list args);
void dfs_seq_printf(struct dfs_seq_file *seq, const char *fmt, ...);
void dfs_seq_putc(struct dfs_seq_file *seq, char c);
void dfs_seq_puts(struct dfs_seq_file *seq, const char *s);
void dfs_seq_pad(struct dfs_seq_file *seq, char c);
#endif
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