DOKK / manpages / debian 10 / allegro5-doc / al_utf8_width.3alleg5.en
al_utf8_width(3alleg5) al_utf8_width(3alleg5)

al_utf8_width - Allegro 5 API

#include <allegro5/allegro.h>
size_t al_utf8_width(int c)
    

Returns the number of bytes that would be occupied by the specified code point when encoded in UTF-8. This is between 1 and 4 bytes for legal code point values. Otherwise returns 0.

al_utf8_encode(3alleg5), al_utf16_width(3alleg5)

Allegro reference manual