XkbLookupKeyBinding - Man Page

int XkbLookupKeyBinding (Display *dpy, KeySym sym, unsigned int state, char *buf, int nbytes, int *extra_rtrn);

dpy

connection to server

sym

connection to server

state

state for which string is to be looked up

buf

buffer into which returned string is written

nbytes

size of buffer in bytes

extra_rtrn

backfilled with number bytes overflow

XkbLookupKeyBinding is the equivalent of the core XLookupString function.

XRebindKeysym binds an ASCII string to a specified keysym, so that the string and keysym are  returned when the key is pressed and a specified list of modifiers are also  being held down. XkbLookupKeyBinding returns in buf the string associated with the keysym sym and modifier state state. buf is NULL terminated unless there's an overflow. If the string returned is larger  than nbytes, a count of bytes that does not fit into the buffer is returned in extra_rtrn. XkbTranslateKeySym returns the number of bytes that it placed into buf.

XkbTranslateKeySym(3), XLookupString(3), XRebindKeysym(3)