xduplic-copier: Print error message, rather than segfaulting, if XOpenDisplay fails.

[chiark-utils.git] / cprogs / xduplic-copier.c

diff --git a/cprogs/xduplic-copier.c b/cprogs/xduplic-copier.c
index 80374f96fc5a8d57c7b1f5fbfdd3baae235688d4..7118d951a9d8444f121979b55b9b8d1e8bbda211 100644 (file)
--- a/cprogs/xduplic-copier.c
+++ b/cprogs/xduplic-copier.c
@@ -234,6 +234,7 @@ int main(int argc, const char **argv) {
   Font font;
 
   display= XOpenDisplay(0);
+  if (!display) { fputs("XOpenDisplay failed\n",stderr); exit(-1); }
   screen= DefaultScreen(display);
   cmap= DefaultColormap(display,screen);
   root= DefaultRootWindow(display);