The requested number of characters extended beyond
the internal buffer. The function copied
characters between _s_t_a_r_t and the end of the
widget's buffer and terminated the string with a
NULL terminator; fewer than _n_u_m__c_h_a_r_s characters
were copied.
RRRREEEELLLLAAAATTTTEEEEDDDD
XXXXmmmmTTTTeeeexxxxttttFFFFiiiieeeelllldddd(3) and XXXXmmmmTTTTeeeexxxxttttFFFFiiiieeeellllddddGGGGeeeettttSSSSuuuubbbbssssttttrrrriiiinnnnggggWWWWccccssss(3).