/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright (c) 1999-2001 by Sun Microsystems, Inc.
 * All rights reserved.
 */

#ifndef _MDB_IO_IMPL_H
#define _MDB_IO_IMPL_H

#include <mdb/mdb_io.h>

#ifdef  __cplusplus
extern "C" {
#endif

#ifdef _MDB

typedef struct mdb_io_ops {
        ssize_t (*io_read)(mdb_io_t *, void *, size_t);
        ssize_t (*io_write)(mdb_io_t *, const void *, size_t);
        off64_t (*io_seek)(mdb_io_t *, off64_t, int);
        int (*io_ctl)(mdb_io_t *, int, void *);
        void (*io_close)(mdb_io_t *);
        const char *(*io_name)(mdb_io_t *);
        void (*io_link)(mdb_io_t *, mdb_iob_t *);
        void (*io_unlink)(mdb_io_t *, mdb_iob_t *);
        int (*io_setattr)(mdb_io_t *, int, uint_t);
        void (*io_suspend)(mdb_io_t *);
        void (*io_resume)(mdb_io_t *);
} mdb_io_ops_t;

#define IOP_READ(io, buf, len) ((io)->io_ops->io_read((io), (buf), (len)))
#define IOP_WRITE(io, buf, len) ((io)->io_ops->io_write((io), (buf), (len)))
#define IOP_SEEK(io, off, whence) ((io)->io_ops->io_seek((io), (off), (whence)))
#define IOP_CTL(io, req, arg) ((io)->io_ops->io_ctl((io), (req), (arg)))
#define IOP_CLOSE(io) ((io)->io_ops->io_close((io)))
#define IOP_NAME(io) ((io)->io_ops->io_name((io)))
#define IOP_LINK(io, iob) ((io)->io_ops->io_link((io), (iob)))
#define IOP_UNLINK(io, iob) ((io)->io_ops->io_unlink((io), (iob)))
#define IOP_SETATTR(io, r, a) ((io)->io_ops->io_setattr((io), (r), (a)))
#define IOP_SUSPEND(io) ((io)->io_ops->io_suspend((io)))
#define IOP_RESUME(io) ((io)->io_ops->io_resume((io)))

#define IOPF_READ(io)   \
        ((ssize_t (*)(mdb_io_t *, void *, size_t))(io)->io_ops->io_read)

#define IOPF_WRITE(io)  \
        ((ssize_t (*)(mdb_io_t *, void *, size_t))(io)->io_ops->io_write)

#define ATT_STANDOUT    0x01            /* Standout mode */
#define ATT_UNDERLINE   0x02            /* Underline mode */
#define ATT_REVERSE     0x04            /* Reverse video mode */
#define ATT_BOLD        0x08            /* Bold text mode */
#define ATT_DIM         0x10            /* Dim text mode */
#define ATT_ALTCHARSET  0x20            /* Alternate character set mode */

#define ATT_ALL         0x3f            /* Mask of all valid attributes */

#define ATT_OFF         0               /* Turn attributes off */
#define ATT_ON          1               /* Turn attributes on */

struct mdb_io {
        const mdb_io_ops_t *io_ops;     /* I/O type-specific operations */
        void *io_data;                  /* I/O type-specific data pointer */
        mdb_io_t *io_next;              /* Link to next i/o object on stack */
        size_t io_refcnt;               /* Reference count */
};

struct mdb_iob {
        char *iob_buf;                  /* Input/output buffer */
        size_t iob_bufsiz;              /* Size of iob_buf in bytes */
        char *iob_bufp;                 /* Current buffer location */
        size_t iob_nbytes;              /* Number of bytes in io_buf */
        size_t iob_nlines;              /* Lines output on current page */
        size_t iob_lineno;              /* Storage for saved yylineno */
        size_t iob_rows;                /* Terminal height */
        size_t iob_cols;                /* Terminal width */
        size_t iob_tabstop;             /* Tab stop width */
        size_t iob_margin;              /* Margin width */
        uint_t iob_flags;               /* Flags (see <mdb/mdb_io.h>) */
        mdb_io_t *iob_iop;              /* I/o implementation pointer */
        mdb_io_t *iob_pgp;              /* Pager i/o implementation pointer */
        mdb_iob_t *iob_next;            /* Stack next pointer */
};

/*
 * Stub functions for i/o backend implementors: these stubs either act as
 * pass-through no-ops or return ENOTSUP as appropriate.
 */
extern ssize_t no_io_read(mdb_io_t *, void *, size_t);
extern ssize_t no_io_write(mdb_io_t *, const void *, size_t);
extern off64_t no_io_seek(mdb_io_t *, off64_t, int);
extern int no_io_ctl(mdb_io_t *, int, void *);
extern void no_io_close(mdb_io_t *);
extern const char *no_io_name(mdb_io_t *);
extern void no_io_link(mdb_io_t *, mdb_iob_t *);
extern void no_io_unlink(mdb_io_t *, mdb_iob_t *);
extern int no_io_setattr(mdb_io_t *, int, uint_t);
extern void no_io_suspend(mdb_io_t *);
extern void no_io_resume(mdb_io_t *);

#endif  /* _MDB */

#ifdef  __cplusplus
}
#endif

#endif  /* _MDB_IO_IMPL_H */