3 files changed, 55 insertions, 17 deletions
diff --git a/src/kat.c b/src/kat.c
index 7a279d0..9c50aed 100644
--- a/src/kat.c
+++ b/src/kat.c
@@ -6,6 +6,8 @@
 #include <sys/stat.h>
 #include <unistd.h>
 
+#include "util/map.h"
+
 int entry_kat(int argc, char **argv) {
   if (argc == 2 && strcmp(argv[1], "-h") == 0) {
     fprintf(stderr, "Gebruik: kat [BESTAND]...\n"
@@ -16,26 +18,13 @@ int entry_kat(int argc, char **argv) {
 
   for (int i = 1; i < argc; i++) {
     const char *fname = argv[i];
-    int fd = open(fname, O_RDONLY);
-
-    struct stat sb;
-    if (fstat(fd, &sb) == -1) {
-      fprintf(stderr, "Kon bestand niet lezen\n");
-      return 0;
-    }
-
-    char *addr = mmap(NULL, sb.st_size, PROT_READ, MAP_SHARED, fd, 0);
-    if (addr == MAP_FAILED) {
-      fprintf(stderr, "Kon bestand niet kaarten\n");
-      return 0;
-    }
+    struct map *map = open_map(fname);
 
-    for (size_t i = 0; i < sb.st_size; i++) {
-      putchar(addr[i]);
+    for (size_t i = 0; i < map->sb.st_size; i++) {
+      putchar(map->addr[i]);
     }
 
-    munmap(addr, sb.st_size);
-    close(fd);
+    close_map(map);
   }
 
   return 0;
diff --git a/src/util/map.c b/src/util/map.c
new file mode 100644
index 0000000..db691d3
--- /dev/null
+++ b/src/util/map.c
@@ -0,0 +1,39 @@
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#include "map.h"
+
+struct map *open_map(const char *fname) {
+  int fd = open(fname, O_RDONLY);
+
+  struct stat sb;
+  if (fstat(fd, &sb) == -1) {
+    fprintf(stderr, "Kon bestand niet lezen\n");
+    return NULL;
+  }
+
+  char *addr = mmap(NULL, sb.st_size, PROT_READ, MAP_SHARED, fd, 0);
+  if (addr == MAP_FAILED) {
+    fprintf(stderr, "Kon bestand niet kaarten\n");
+    return NULL;
+  }
+
+  struct map *res = calloc(1, sizeof(struct map));
+
+  res->addr = addr;
+  res->sb = sb;
+  res->fd = fd;
+  return res;
+}
+
+void close_map(struct map *m) {
+  munmap(m->addr, m->sb.st_size);
+  close(m->fd);
+  free(m);
+}
diff --git a/src/util/map.h b/src/util/map.h
new file mode 100644
index 0000000..232720f
--- /dev/null
+++ b/src/util/map.h
@@ -0,0 +1,10 @@
+#include <sys/stat.h>
+
+struct map {
+  char *addr;
+  struct stat sb;
+  int fd;
+};
+
+struct map *open_map(const char *fname);
+void close_map(struct map *m);