TildeExpansion: prefer snprintf to strcpy+strcat
TildeExpansion: prefer snprintf to strcpy+strcat

.. for the reasons given in the prior commit.  In this case I believe
the comment that overflow is impossible is right; but just in case it's
not, this avoids the overflow in strcat

araisrobo/machinekit,EqAfrica/machinekit,mhaberler/machinekit,strahlex/machinekit,mhaberler/machinekit,kinsamanka/machinekit,ArcEye/MK-Qt5,ikcalB/linuxcnc-mirror,ArcEye/machinekit-testing,araisrobo/machinekit,araisrobo/machinekit,araisrobo/machinekit,mhaberler/machinekit,ikcalB/linuxcnc-mirror,bmwiedemann/linuxcnc-mirror,cdsteinkuehler/MachineKit,ianmcmahon/linuxcnc-mirror,RunningLight/machinekit,araisrobo/linuxcnc,araisrobo/linuxcnc,cdsteinkuehler/linuxcnc,ikcalB/linuxcnc-mirror,Cid427/machinekit,EqAfrica/machinekit,RunningLight/machinekit,cdsteinkuehler/linuxcnc,araisrobo/linuxcnc,narogon/linuxcnc,bobvanderlinden/machinekit,unseenlaser/linuxcnc,unseenlaser/linuxcnc,bobvanderlinden/machinekit,RunningLight/machinekit,RunningLight/machinekit,bobvanderlinden/machinekit,kinsamanka/machinekit,mhaberler/machinekit,kinsamanka/machinekit,bmwiedemann/linuxcnc-mirror,EqAfrica/machinekit,araisrobo/machinekit,mhaberler/machinekit,ianmcmahon/linuxcnc-mirror,RunningLight/machinekit,cnc-club/linuxcnc,kinsamanka/machinekit,RunningLight/machinekit,ianmcmahon/linuxcnc-mirror,unseenlaser/linuxcnc,Cid427/machinekit,bobvanderlinden/machinekit,cdsteinkuehler/MachineKit,ArcEye/MK-Qt5,aschiffler/linuxcnc,cdsteinkuehler/MachineKit,ArcEye/MK-Qt5,bobvanderlinden/machinekit,cdsteinkuehler/linuxcnc,ianmcmahon/linuxcnc-mirror,bobvanderlinden/machinekit,bmwiedemann/linuxcnc-mirror,Cid427/machinekit,ArcEye/MK-Qt5,strahlex/machinekit,EqAfrica/machinekit,unseenlaser/machinekit,cdsteinkuehler/MachineKit,Cid427/machinekit,ArcEye/MK-Qt5,kinsamanka/machinekit,narogon/linuxcnc,ArcEye/MK-Qt5,strahlex/machinekit,unseenlaser/machinekit,ArcEye/MK-Qt5,ikcalB/linuxcnc-mirror,unseenlaser/machinekit,cnc-club/linuxcnc,bmwiedemann/linuxcnc-mirror,ArcEye/machinekit-testing,unseenlaser/linuxcnc,cdsteinkuehler/linuxcnc,unseenlaser/machinekit,mhaberler/machinekit,ianmcmahon/linuxcnc-mirror,Cid427/machinekit,strahlex/machinekit,ArcEye/machinekit-testing,bobvanderlinden/machinekit,Cid427/machinekit,kinsamanka/machinekit,cnc-club/linuxcnc,araisrobo/machinekit,unseenlaser/machinekit,araisrobo/machinekit,cdsteinkuehler/MachineKit,araisrobo/linuxcnc,EqAfrica/machinekit,bmwiedemann/linuxcnc-mirror,ArcEye/machinekit-testing,EqAfrica/machinekit,ikcalB/linuxcnc-mirror,mhaberler/machinekit,Cid427/machinekit,aschiffler/linuxcnc,strahlex/machinekit,strahlex/machinekit,bmwiedemann/linuxcnc-mirror,cdsteinkuehler/linuxcnc,aschiffler/linuxcnc,mhaberler/machinekit,RunningLight/machinekit,aschiffler/linuxcnc,ArcEye/machinekit-testing,narogon/linuxcnc,ianmcmahon/linuxcnc-mirror,cdsteinkuehler/MachineKit,cnc-club/linuxcnc,unseenlaser/machinekit,aschiffler/linuxcnc,ArcEye/machinekit-testing,cdsteinkuehler/linuxcnc,narogon/linuxcnc,kinsamanka/machinekit,kinsamanka/machinekit,ianmcmahon/linuxcnc-mirror,cnc-club/linuxcnc,araisrobo/machinekit,strahlex/machinekit,cnc-club/linuxcnc,Cid427/machinekit,unseenlaser/machinekit,RunningLight/machinekit,unseenlaser/machinekit,EqAfrica/machinekit,EqAfrica/machinekit,bmwiedemann/linuxcnc-mirror,unseenlaser/linuxcnc,ArcEye/machinekit-testing,ikcalB/linuxcnc-mirror,bobvanderlinden/machinekit,ikcalB/linuxcnc-mirror,ArcEye/machinekit-testing,cnc-club/linuxcnc,araisrobo/machinekit,araisrobo/linuxcnc,ArcEye/MK-Qt5,narogon/linuxcnc