108 lines
3.5 KiB
C
108 lines
3.5 KiB
C
/* ----------------------------------------------------------------------- *
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*
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* Copyright 2003-2008 H. Peter Anvin - All Rights Reserved
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use,
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* copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom
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* the Software is furnished to do so, subject to the following
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* conditions:
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*
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* The above copyright notice and this permission notice shall
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* be included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* ----------------------------------------------------------------------- */
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/*
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* file.h
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*
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* Internal implementation of file I/O for COM32
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*/
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#ifndef _COM32_SYS_FILE_H
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#define _COM32_SYS_FILE_H
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#include <inttypes.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <dev.h>
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#include <fcntl.h>
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#include <syslinux/pmapi.h>
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/* Device structure; contains the relevant operations */
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struct file_info;
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#define __DEV_MAGIC 0xf4e7
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#define __DEV_TTY 0x0001 /* TTY - must be bit 0 */
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#define __DEV_FILE 0x0002 /* Ordinary file */
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#define __DEV_OUTPUT 0x0004 /* This is an output device */
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#define __DEV_INPUT 0 /* Dummy */
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#define __DEV_ERROR 0x0008 /* This is the error device */
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#define __DEV_NULL 0x0010 /* This is the null device */
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struct input_dev {
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uint16_t dev_magic; /* Magic number */
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uint16_t flags; /* Flags */
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int fileflags; /* Permitted file flags */
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ssize_t (*read)(struct file_info *, void *, size_t);
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int (*close)(struct file_info *);
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int (*open)(struct file_info *);
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};
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struct output_dev {
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uint16_t dev_magic; /* Magic number */
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uint16_t flags; /* Flags */
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int fileflags;
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ssize_t (*write)(struct file_info *, const void *, size_t);
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int (*close)(struct file_info *);
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int (*open)(struct file_info *);
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const struct output_dev *fallback; /* Fallback option for certain consoles */
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};
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/* File structure */
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#define NFILES 128 /* Number of files to support */
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#define MAXBLOCK 16384 /* Defined by ABI */
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struct file_info {
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const struct input_dev *iop; /* Input operations */
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const struct output_dev *oop; /* Output operations */
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/* Output file data */
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struct {
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int rows, cols; /* Rows and columns */
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} o;
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/* Structure used for input blocking */
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struct {
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struct com32_filedata fd;
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size_t offset; /* Current file offset */
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size_t nbytes; /* Number of bytes available in buffer */
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char *datap; /* Current data pointer */
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void *pvt; /* Private pointer for driver */
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char buf[MAXBLOCK];
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} i;
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};
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extern struct file_info __file_info[NFILES];
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extern const struct input_dev __file_dev;
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/* Line input discipline */
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ssize_t __line_input(struct file_info *fp, char *buf, size_t bufsize,
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ssize_t(*get_char) (struct file_info *, void *, size_t));
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#endif /* _COM32_SYS_FILE_H */
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