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Sample code to use TIOCGWINSZ in python

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Kovid Goyal
2018-02-20 16:47:06 +05:30
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graphics-protocol.asciidoc
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@@ -35,14 +35,23 @@ toc::[]
In order to know what size of images to display and how to position them, the client must be able to get the In order to know what size of images to display and how to position them, the client must be able to get the
window size in pixels and the number of cells per row and column. This can be done by using the `TIOCGWINSZ` ioctl. window size in pixels and the number of cells per row and column. This can be done by using the `TIOCGWINSZ` ioctl.
Some C code to demonstrate its use Some code to demonstrate its use
In C:
```C ```C
struct ttysize ts; struct ttysize ts;
ioctl(0, TIOCGWINSZ, &ts); ioctl(0, TIOCGWINSZ, &ts);
printf("number of columns: %i, number of rows: %i, screen width: %i, screen height: %i\n", sz.ws_col, sz.ws_row, sz.ws_xpixel, sz.ws_ypixel); printf("number of columns: %i, number of rows: %i, screen width: %i, screen height: %i\n", sz.ws_col, sz.ws_row, sz.ws_xpixel, sz.ws_ypixel);
``` ```
In Python:
```py
import struct, fcntl, termios
s = struct.pack('HHHH', 0, 0, 0, 0)
x = struct.unpack('HHHH', fcntl.ioctl(1, termios.TIOCGWINSZ, s))
print(f'number of columns: {x[0]}, number of rows: {x[1]}, screen width: {x[2]}, screen height: {x[3]}')
```
Note that some terminals return `0` for the width and height values. Such terminals should be modified to return the correct values. Note that some terminals return `0` for the width and height values. Such terminals should be modified to return the correct values.
Examples of terminals that return correct values: `kitty, xterm` Examples of terminals that return correct values: `kitty, xterm`