99 lines
3.1 KiB
C
99 lines
3.1 KiB
C
#ifndef SOCKS_TTY_H_
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#define SOCKS_TTY_H_
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#include <socks/status.h>
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#include <socks/queue.h>
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#include <socks/object.h>
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#include <stdint.h>
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/* The TTY system.
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TTYs are an enhanced version of the console object. Rather than a simple output
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device for log messages, TTYs are intended to support fully-featured interactive
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user sessions, including advanced display manipulation (if applicable) and
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buffered user input.
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A TTY object is split into 2 parts:
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- struct tty: This represents the terminal session, and tracks things like the cursor
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position, input buffer, flags, etc.
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- struct tty_driver: This is a set of function callbacks that the TTY can use to
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manipulate the output device. This could represent a char-based framebuffer
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device, a serial port, etc.
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*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* opaque context pointer for use by the tty driver */
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typedef void *tty_driver_ctx_t;
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enum tty_driver_type {
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/* For TTYs operating on simple IO devices like serial ports.
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Allows writing characters, receiving characters, and not much else. */
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TTY_DRIVER_SIMPLE,
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/* For TTYs operating on more capable display interfaces.
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Allows putting characters at arbitrary locations, scrolling, etc */
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TTY_DRIVER_FULL,
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};
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/* TTY cursor status. The extra cursor styles are just for completeness,
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the important one to support (if possible), is TTY_CURSOR_NONE.
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The others can be interpreted as "just turn on a cursor of any style". */
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enum tty_cursor {
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TTY_CURSOR_ULINE,
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TTY_CURSOR_BLOCK,
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TTY_CURSOR_NONE,
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};
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/* direction to use for scrolling. The important one to support is
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TTY_SCROLL_DOWN for when output overflows the display */
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enum tty_scroll_dir {
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TTY_SCROLL_DOWN,
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TTY_SCROLL_UP,
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};
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/* character attribute. this could be as simple as VGA's 16-colour palette
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plus an extra bit for bright, or a full 24-bit RGB value with bold and underline
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support, depending on what the driver supports. */
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typedef uint64_t tty_attrib_t;
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struct tty_driver {
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struct object tty_base;
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char tty_name[16];
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enum tty_driver_type tty_type;
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struct queue_entry tty_list;
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void (*tty_init)(tty_driver_ctx_t *ctx);
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void (*tty_deinit)(tty_driver_ctx_t ctx);
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void (*tty_clear)(tty_driver_ctx_t ctx, int x, int y, int width, int height);
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void (*tty_putc)(tty_driver_ctx_t ctx, int c, int xpos, int ypos, tty_attrib_t attrib);
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void (*tty_set_cursor)(tty_driver_ctx_t ctx, enum tty_cursor cur);
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void (*tty_move_cursor)(tty_driver_ctx_t ctx, int x, int y);
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void (*tty_scroll)(tty_driver_ctx_t ctx, enum tty_scroll_dir dir, int lines);
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};
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struct tty {
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int tty_xcur, tty_ycur;
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unsigned int tty_iflag, tty_oflag, tty_lflag;
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tty_driver_ctx_t tty_dctx;
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const struct tty_driver *tty_driver;
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};
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extern kern_status_t tty_driver_register(struct tty_driver *drv);
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extern kern_status_t tty_driver_unregister(struct tty_driver *drv);
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extern struct tty *tty_create(void);
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extern void tty_destroy(struct tty *tty);
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extern int tty_read(struct tty *tty, char *s, unsigned long len);
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extern int tty_write(struct tty *tty, const char *s, unsigned long len);
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#ifdef __cplusplus
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}
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#endif
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#endif
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