liblx provides various convenience routines.  This file describes those
which aren't documented elsewhere.

lx_lookup_color, lx_lookup_color_rgb
---------------  -------------------

LX_OP *lx_lookup_color(
	LX_CONN *conn, LX_XID cmap,
	const char *name, int len,
	unsigned int *rp, unsigned int *gp, unsigned int *bp,
	int *succp)
LX_OP *lx_lookup_color_rgb(
	LX_CONN *conn, LX_XID cmap,
	const char *name, int len,
	LX_RGB *rgp, int *succp)

lx_lookup_color() is just like lx_LookupColor, and
lx_lookup_color_rgb() is just like lx_LookupColor_rgb, except that (a)
they handle the #rgb, #rrggbb, #rrrgggbbb, and #rrrrggggbbbb syntaxes
internally rather than querying the server, (b) they don't take
arguments returning visual values (because a server roundtrip may not
happen), (c) they take an additional pointer-to-int which receives a
success boolean (true for success, false for failure), and (d) they
trap Name errors (reflected to the API as failure) from any LookupColor
request they do.