infocmp -1 for the 256 color xterm terminfo file shows the following format
string
u8=\E[?%[;0123456789]c,
...but what is the %[ operator? Is this a "harmless" mistake or an
undocumented operator?? :)
The only thing I see in man 5 terminfo is the following entry which does
not seem to correspond with the above...
%[[:]flags][width[.precision]][doxXs]
as in printf(3), flags are [-+#] and space. Use a “:” to
allow the next character to be a
“-” flag, avoiding interpreting “%-” as an operator.
--
“When something can be read without effort,
great effort has gone into its writing.”
― Enrique Jardiel Poncela ―
