Storage of varying-length data

Store data in a varying-length structure
The mi_set_vardata() and mi_set_vardata_align() functions copy data into an existing data portion of a varying-length structure. These functions assume that the data portion is large enough to hold the data being copied.

Store a null-terminated string

Set the data pointer
The mi_set_varptr() function enables you to set the data pointer in a varying-length structure to memory that you allocate.