+void
+setmfact(const char *arg) {
+ double delta;
+
+ if(!arg || lt->isfloating)
+ return;
+ delta = strtod(arg, NULL);
+ if(arg[0] == '-' || arg[0] == '+') {
+ if(mfact + delta < 0.1 || mfact + delta > 0.9)
+ return;
+ mfact += delta;
+ }
+ else {
+ if(delta < 0.1 || delta > 0.9)
+ return;
+ mfact = delta;
+ }
+ setgeom(geom->symbol);
+}
+