bool al_ustr_assign_substr(ALLEGRO_USTR *us1, const ALLEGRO_USTR *us2,
   int start_pos, int end_pos)
Introduced in 5.0.0

Overwrite the string us1 with the contents of us2 in the byte interval [start_pos, end_pos). The end points will be clamed to the bounds of us2.

Usually you will first have to use al_ustr_offset to find the byte offsets.

Returns true on success, false on error.

See also: al_ustr_assign, al_ustr_assign_cstr

Examples: ex_utf8