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diff --git a/types.h b/types.h
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+/*
+ * types.h
+ * Copyright 2019 Bruce Hill
+ * Released under the MIT license
+ *
+ * This file contains definitions of different types.
+ */
+#ifndef FILE_TYPES__H
+#define FILE_TYPES__H
+
+#include <limits.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#include "terminal.h"
+
+#define MAX_COLS 12
+#define MAX_SORT (2*MAX_COLS)
+#define HASH_SIZE 1024
+#define HASH_MASK (HASH_SIZE - 1)
+
+/* Datastructure for file/directory entries.
+ * entry_t uses intrusive linked lists.  This means entries can only belong to
+ * one list at a time, in this case the list of selected entries. 'atme' is an
+ * indirect pointer to either the 'next' field of the previous list member, or
+ * the variable that points to the first list member. In other words,
+ * item->next->atme == &item->next and firstitem->atme == &firstitem.
+ */
+typedef struct entry_s {
+    struct {
+        struct entry_s *next, **atme;
+    } selected, hash;
+    char *name, *linkname;
+    struct stat info;
+    mode_t linkedmode;
+    int no_esc : 1;
+    int link_no_esc : 1;
+    int shufflepos;
+    int index;
+    char fullname[1];
+    // ------- fullname must be last! --------------
+    // When entries are allocated, extra space on the end is reserved to fill
+    // in fullname.
+} entry_t;
+
+// For keeping track of child processes:
+typedef struct proc_s {
+    pid_t pid;
+    struct {
+        struct proc_s *next, **atme;
+    } running;
+} proc_t;
+
+// Structure for bb program state:
+typedef struct bb_s {
+    entry_t *hash[HASH_SIZE];
+    entry_t **files;
+    entry_t *selected;
+    char path[PATH_MAX];
+    char prev_path[PATH_MAX];
+    int nfiles, nselected;
+    int scroll, cursor;
+
+    char *globpats;
+    char sort[MAX_SORT+1];
+    char columns[MAX_COLS+1];
+    unsigned int interleave_dirs : 1;
+    unsigned int should_quit : 1;
+    unsigned int dirty : 1;
+    proc_t *running_procs;
+} bb_t;
+
+// Key bindings:
+typedef struct {
+    int key;
+    char *script;
+    char *description;
+} binding_t;
+
+#endif
+// vim: ts=4 sw=0 et cino=L2,l1,(0,W4,m1