#include <pc.h> int ScreenCols(void);
This function returns the number of columns of the screen. It does so by looking at the byte at the absolute address 40:4Ah in the BIOS area. In text modes, the meaning of number of columns is obvious; in graphics modes, this value is the number of columns of text available when using the video BIOS functions to write text.
The number of columns.
not ANSI, not POSIX
int available_columns = ScreenCols();
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