s_tolower
extern wchar_t s_toupper[], s_tolower[], s_asort[];
s_tolower, FUNC, f_tolower,
wchar_t s_tolower[] = M_MB_L("tolower"); /* Name of "tolower" function */
awkerr(nargerr, upper ? s_toupper : s_tolower);
extern void s_tolower(string *);
extern void s_tolower();