explicitly cast NULL to appropriate pointer type when used as sentinel

4 files changed, 4 insertions, 4 deletions

diff --git a/src/graph/viewAlone/spoon2D.c b/src/graph/viewAlone/spoon2D.c
index 2765ce56..00f46e31 100644
--- a/src/graph/viewAlone/spoon2D.c
+++ b/src/graph/viewAlone/spoon2D.c
@@ -86,7 +86,7 @@ spoonView2D(void)
     sprintf(errorStr,"%s","(viewAlone) execution of the TwoDimensionalViewport process");
     sprintf(envAXIOM,"%s",oa_getenv("AXIOM"));
     sprintf(runView,"%s%s",envAXIOM,"/lib/view2D");
-    check(execl(runView,runView,NULL));
+    check(execl(runView,runView, (char*)NULL));
     fprintf(stderr,"Could not execute view2D! Check that view2D is on your path variable.\n");
     exit(-1);
 
diff --git a/src/graph/viewAlone/spoonComp.c b/src/graph/viewAlone/spoonComp.c
index b708eed3..5714d04f 100644
--- a/src/graph/viewAlone/spoonComp.c
+++ b/src/graph/viewAlone/spoonComp.c
@@ -88,7 +88,7 @@ spoonView3D(int type)
             "(viewAlone) execution of the ThreeDimensionalViewport process");
     sprintf(envAXIOM,"%s",oa_getenv("AXIOM"));
     sprintf(runView,"%s%s",envAXIOM,"/lib/view3D");
-    check(execl(runView,runView,NULL));
+    check(execl(runView,runView, (char*) NULL));
     fprintf(stderr,"Could not execute view3D!\n");
     exit(-1);
   default:
diff --git a/src/graph/viewman/fun2D.c b/src/graph/viewman/fun2D.c
index 02810ffe..d3948b6b 100644
--- a/src/graph/viewman/fun2D.c
+++ b/src/graph/viewman/fun2D.c
@@ -224,7 +224,7 @@ forkView2D(void)
 #endif
     sprintf(envAXIOM,"%s",oa_getenv("AXIOM"));
     sprintf(runView,"%s%s",envAXIOM,"/lib/view2D");
-    check(execl(runView,runView,NULL));
+    check(execl(runView,runView, (char*) NULL));
     fprintf(stderr,"The viewport manager could not execute view2D.\nCheck that view2D is on your PATH.\n");
     exit(-1);
 
diff --git a/src/graph/viewman/fun3D.c b/src/graph/viewman/fun3D.c
index a0ced1b6..177aece1 100644
--- a/src/graph/viewman/fun3D.c
+++ b/src/graph/viewman/fun3D.c
@@ -276,7 +276,7 @@ forkView3D(int typeOfViewport)
 #endif
     sprintf(envAXIOM,"%s",oa_getenv("AXIOM"));
     sprintf(runView,"%s%s",envAXIOM,"/lib/view3D");
-    check(execl(runView,runView,NULL));
+    check(execl(runView,runView, (char*) NULL));
     fprintf(stderr,"The viewport manager could not execute view3D.\nCheck that view3D is on your PATH.\n");
     exit(-1);