X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~mdw/git/disorder/blobdiff_plain/763d5e6ad88ef3ba1cd1d7742d060e4f1e54c6b8..04024c2cafab56ea76a9a2b35097584d6db98c06:/lib/selection.c

diff --git a/lib/selection.c b/lib/selection.c
index a7db75f..58ff5d1 100644
--- a/lib/selection.c
+++ b/lib/selection.c
@@ -1,6 +1,6 @@
 /*
  * This file is part of DisOrder
- * Copyright (C) 2006 Richard Kettlewell
+ * Copyright (C) 2006, 2007 Richard Kettlewell
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -17,6 +17,9 @@
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  * USA
  */
+/** @file lib/selection.c
+ * @brief Select management for Disobedience
+ */
 
 #include <config.h>
 #include "types.h"
@@ -25,25 +28,56 @@
 #include "hash.h"
 #include "selection.h"
 
+/** @brief Create a new selection manager
+ * @return Pointer to @ref hash used to manage the selection
+ */
 hash *selection_new(void) {
   return hash_new(sizeof (int));
 }
 
+/** @brief Add or remove a key in a selection
+ * @param h Hash representing selection
+ * @param key Key to insert
+ * @param selected non-0 if key is selected, 0 if it is not
+ *
+ * @p key is copied so the pointer need not remain valid.  Newly selected keys
+ * are not marked as live.
+ */
 void selection_set(hash *h, const char *key, int selected) {
-  if(selected)
-    hash_add(h, key, xmalloc_noptr(sizeof (int)), HASH_INSERT_OR_REPLACE);
-  else
+  if(selected) {
+    int *const liveness = xmalloc_noptr(sizeof (int));
+    *liveness = 0;
+    hash_add(h, key, liveness, HASH_INSERT_OR_REPLACE);
+  } else
     hash_remove(h, key);
 }
 
+/** @brief Test whether a key is set in a selection
+ * @param h Hash representing selection
+ * @param key Key to check
+ * @return non-0 if key is present, 0 if it is not
+ */
 int selection_selected(hash *h, const char *key) {
   return hash_find(h, key) != 0;
 }
 
+/** @brief Invert a key's selection status
+ * @param h Hash representing selection
+ * @param key Key to flip
+ *
+ * If the key is selected as a result it is not marked as live.
+ */
 void selection_flip(hash *h, const char *key) {
   selection_set(h, key, !selection_selected(h, key));
 }
 
+/** @brief Mark a selection key as live
+ * @param h Hash representing selection
+ * @param key Key to mark as live
+ *
+ * Live keys will survive a call to selection_cleanup().  @p need not be in the
+ * selection (if it is not then the call will be ignored).
+ */
 void selection_live(hash *h, const char *key) {
   int *ptr = hash_find(h, key);
 
@@ -61,6 +95,11 @@ static int selection_cleanup_callback(const char *key,
   return 0;
 }
 
+/** @brief Delete all non-live keys from a selection
+ * @param h Hash representing selection
+ *
+ * After cleanup, no keys are marked as live.
+ */
 void selection_cleanup(hash *h) {
   hash_foreach(h, selection_cleanup_callback, h);
 }
@@ -72,6 +111,9 @@ static int selection_empty_callback(const char *key,
   return 0;
 }
 
+/** @brief Remove all keys from a selection
+ * @param h Hash representing selection
+ */
 void selection_empty(hash *h) {
   hash_foreach(h, selection_empty_callback, h);
 }