5 files changed, 29 insertions, 10 deletions
diff --git a/src/hoofd.c b/src/hoofd.c
index 64c2bfd..62d1151 100644
--- a/src/hoofd.c
+++ b/src/hoofd.c
@@ -58,8 +58,12 @@ int entry_hoofd(int argc, char **argv) {
   char **args = parse_options(argc, argv, &n, &c);
 
   while (*args != NULL) {
-    struct map *map = open_map(*args);
-    if (map == NULL) {
+    bool isdir;
+    struct map *map = open_map(*args, &isdir);
+    if (isdir) {
+      fprintf(stderr, "hoofd: %s: is een mapje\n", *args);
+      goto next;
+    } else if (map == NULL) {
       fprintf(stderr, "hoofd: fout bij lezen bestand");
       return 1;
     }
@@ -73,6 +77,7 @@ int entry_hoofd(int argc, char **argv) {
     }
     fwrite(map->addr, 1, i, stdout);
 
+next:
     args++;
   }
 
diff --git a/src/kat.c b/src/kat.c
index 8a0fe59..5549b24 100644
--- a/src/kat.c
+++ b/src/kat.c
@@ -39,8 +39,13 @@ static char** parse_options(int argc, char **argv) {
 }
 
 static void process(const char *fname) {
-  struct map *map = open_map(fname);
-  if (map == NULL) {
+  bool isdir;
+
+  struct map *map = open_map(fname, &isdir);
+  if (isdir) {
+    fprintf(stderr, "kat: %s: is een mapje\n", fname);
+    return;
+  } else if (map == NULL) {
     exit(1);
   }
 
diff --git a/src/toilet.c b/src/toilet.c
index 0f4d66f..ce42aca 100644
--- a/src/toilet.c
+++ b/src/toilet.c
@@ -116,10 +116,14 @@ int entry_toilet(int argc, char **argv) {
   }
 
   while (*args != NULL) {
-    struct map *map = open_map(*args);
-    if (map == NULL) {
-      fprintf(stderr, "toilet: fout bij lezen bestand");
+    bool isdir;
+    struct map *map = open_map(*args, &isdir);
+    if (map == NULL && !isdir) {
+      fprintf(stderr, "toilet: fout bij lezen bestand '%s'\n", *args);
       return 1;
+    } else if (isdir) {
+      fprintf(stderr, "toilet: %s: is een mapje\n", *args);
+      goto next;
     }
 
     for (enum MODE mode = 1; mode <= M_BYTES; mode <<= 1) {
@@ -128,10 +132,11 @@ int entry_toilet(int argc, char **argv) {
         printf("%li ", count);
       }
     }
-
     printf("%s\n", *args);
 
     close_map(map);
+
+next:
     args++;
   }
 
diff --git a/src/util/map.c b/src/util/map.c
index 27e1c04..6a1faf1 100644
--- a/src/util/map.c
+++ b/src/util/map.c
@@ -9,7 +9,9 @@
 
 #include "map.h"
 
-struct map *open_map(const char *fname) {
+struct map *open_map(const char *fname, bool *isdir) {
+  if (isdir != NULL) *isdir = false;
+
   int fd = open(fname, O_RDONLY);
 
   struct stat sb;
@@ -21,6 +23,7 @@ struct map *open_map(const char *fname) {
   char *addr = mmap(NULL, sb.st_size, PROT_READ, MAP_SHARED, fd, 0);
   if (addr == MAP_FAILED) {
     //fprintf(stderr, "Kon bestand niet projecteren in geheugen\n");
+    if (isdir != NULL) *isdir = S_ISDIR(sb.st_mode);
     return NULL;
   }
 
diff --git a/src/util/map.h b/src/util/map.h
index 67beb9c..14a48e1 100644
--- a/src/util/map.h
+++ b/src/util/map.h
@@ -1,3 +1,4 @@
+#include <stdbool.h>
 #include <sys/stat.h>
 
 struct map {
@@ -7,5 +8,5 @@ struct map {
   int fd;
 };
 
-struct map *open_map(const char *fname);
+struct map *open_map(const char *fname, bool *isdir);
 void close_map(struct map *m);