HelenOS sources

vt100_putuchar    187 uspace/lib/vt/include/vt/vt100.h extern void vt100_putuchar(vt100_t *, char32_t);
vt100_putuchar     74 uspace/srv/hid/output/ctl/serial.c 	vt100_putuchar(state, field->ch);
vt100_putuchar    532 uspace/srv/hid/remcons/remcons.c 			vt100_putuchar(remcons->vt, ch->ch);
HelenOS homepage, sources at GitHub