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/* ----------------------------------------------------------------------- *
*
* Copyright 2003-2008 H. Peter Anvin - All Rights Reserved
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom
* the Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall
* be included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* ----------------------------------------------------------------------- */
/*
* file.h
*
* Internal implementation of file I/O for COM32
*/
#ifndef _COM32_SYS_FILE_H
#define _COM32_SYS_FILE_H
#include <inttypes.h>
#include <stdlib.h>
#include <sys/types.h>
#include <dev.h>
#include <fcntl.h>
/* Device structure; contains the relevant operations */
struct file_info;
#define __DEV_MAGIC 0xf4e7
#define __DEV_TTY 0x0001 /* TTY - must be bit 0 */
#define __DEV_FILE 0x0002 /* Ordinary file */
#define __DEV_OUTPUT 0x0004 /* This is an output device */
#define __DEV_INPUT 0 /* Dummy */
#define __DEV_ERROR 0x0008 /* This is the error device */
#define __DEV_NULL 0x0010 /* This is the null device */
struct input_dev {
uint16_t dev_magic; /* Magic number */
uint16_t flags; /* Flags */
int fileflags; /* Permitted file flags */
ssize_t (*read)(struct file_info *, void *, size_t);
int (*close)(struct file_info *);
int (*open)(struct file_info *);
};
struct output_dev {
uint16_t dev_magic; /* Magic number */
uint16_t flags; /* Flags */
int fileflags;
ssize_t (*write)(struct file_info *, const void *, size_t);
int (*close)(struct file_info *);
int (*open)(struct file_info *);
const struct output_dev *fallback; /* Fallback option for certain consoles */
};
/* File structure */
#define NFILES 32 /* Number of files to support */
#define MAXBLOCK 16384 /* Defined by ABI */
struct file_info {
const struct input_dev *iop; /* Input operations */
const struct output_dev *oop; /* Output operations */
/* Output file data */
struct {
int rows, cols; /* Rows and columns */
} o;
/* Structure used for input blocking */
struct {
int blocklg2; /* Blocksize log 2 */
size_t offset; /* Current file offset */
size_t length; /* Total file length */
uint16_t filedes; /* File descriptor */
uint16_t _filler; /* Unused */
size_t nbytes; /* Number of bytes available in buffer */
char *datap; /* Current data pointer */
void *pvt; /* Private pointer for driver */
char buf[MAXBLOCK];
} i;
};
extern struct file_info __file_info[NFILES];
/* Line input discipline */
ssize_t __line_input(struct file_info *fp, char *buf, size_t bufsize,
ssize_t (*get_char)(struct file_info *, void *, size_t));
#endif /* _COM32_SYS_FILE_H */
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