1 files changed, 4 insertions, 2 deletions

diff --git a/src/scanner.c b/src/scanner.c
index d20c714..ea35e3c 100644
--- a/src/scanner.c
+++ b/src/scanner.c
@@ -11,12 +11,14 @@
 #include <error.h>
 
 dlinkedlist * scandirlist(const char * const dir, int (*selector)(const struct dirent *), int (*cmp)(const struct dirent **, const struct dirent **)) {
+    if(!dir || selector == NULL || cmp == NULL) ERRRET(EINVAL, NULL);
+    
     struct dirent **namelist = NULL;
     dlinkedlist *list = NULL;
     int numentries = -1;
 
     if((numentries = scandir(dir, &namelist, selector, cmp)) < 0)
-        RETURNWERR(errno, NULL);
+        ERRRET(errno, NULL);
 
     list = dlinkedlist_init();
     for(int i = 0; i < numentries; i++)
@@ -26,7 +28,7 @@ dlinkedlist * scandirlist(const char * const dir, int (*selector)(const struct d
                 free(namelist[j]);
 
             free(namelist);
-            RETURNWERR(errno, NULL);
+            ERRRET(errno, NULL);
         }
     free(namelist);