al_ustr_ltrim_ws - Allegro 5 API

       Remove leading whitespace characters from a string, as defined by the C function isspace().

       Returns true on success, or false on error.

       al_ustr_ltrim_ws - Allegro 5 API

al_ustr_rtrim_ws(3alleg5), al_ustr_trim_ws(3alleg5)

Allegro reference manual                                                               al_ustr_ltrim_ws(3alleg5)

              #include <allegro5/allegro.h>

              bool al_ustr_ltrim_ws(ALLEGRO_USTR *us)