49 lines
2.2 KiB
Markdown
49 lines
2.2 KiB
Markdown
---
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title: "tty.h"
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summary: "A virtual text output device"
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---
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The TTY is a virtual device, that acts as a text IO layer.
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It prints keyboard input and process output to the screen.
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The keyboard input can be directed to a processes stdin and the processes stdout can be printed to the screen.
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Schematic:
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```
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+-------------------+
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| Graphics Renderer |
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+-------------------+
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^ ^
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| | +----------+ +-----------------+
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| | | TTY | | Process (shell) |
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| | | | | |
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| |--|-[Input]--|-<----|-[stdout] |
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| | | | |
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-[Keyboard]----->-|-[Output]-|->----| [stdin] |
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+----------+ +-----------------+
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```
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# `tty_T` - struct
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| Name | Type | Description |
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|-----------------|--------------------|---------------------------------------------------------------------------------------------------|
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| graphics_buffer | graphics_buffer_T* | The graphics buffer where all output will be rendered to. |
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| output | pipe_T* | Points to the linked processes stdin pipe. |
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| input | pipe_T | This pipes content will be rendered to the screen. The linked processes stdout should point here. |
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| cursor | position_T | The cursors position. |
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| color | color_argb_T | The current drawing color. |
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# `tty_init()` - function (void)
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Initializes `g_tty`.
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# `tty_update()` - function (void)
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Renders the text from the ttys _input pipe_ onto the screen.
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This will be automatically called when writing into the ttys _input pipe_.
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# `tty_write(string)` - function (uint32_t)
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Renders the text from **_string_** onto the screen.
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This also writes **_string_** into the ttys _output pipe_.
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# `g_tty` - global variable
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This is the systems TTY.
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Currently, there is no support planned for multiple ttys.
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