Check number of arguments (between 1 and 255) Allocate an %rv_str% Process constant arguments typedef struct { char *str; /* argument conversion buffer */ int size; /* size of data in str */ char **argv; /* array of arguments */ unsigned int *nc_args; /* array of non-constant args */ unsigned int nc_arg_count; /* number of non-constant args */ unsigned int arg_count; /* number of arguments */ } rv_str;