-.BI "void *x_alloc(size_t " sz );
-.BI "char *x_strdup(const char *" s );
-.BI "void *x_realloc(void *" p ", size_t " sz );
-.BI "void x_free(void *" p );
+.BI "void *x_alloc(arena *" a ", size_t " sz );
+.BI "char *x_strdup(arena *" a ", const char *" s );
+.BI "void *x_realloc(arena *" a ", void *" p ", size_t " sz ", size_t " osz );
+.BI "void x_free(arena *" a ", void *" p );