Add floating layer

[wmpus] / util.h

diff --git a/util.h b/util.h
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..2468ebec9a1096ddf648eef5644f875519d4e91d 100644 (file)
--- a/util.h
+++ b/util.h
@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2011 Andy Spencer <andy753421@gmail.com>
+ * 
+ * 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
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* Various utility functions */
+
+/* Misc macros */
+#define MAX(a,b) ((a) > (b) ? (a) : (b))
+#define MIN(a,b) ((a) < (b) ? (a) : (b))
+
+#define new0(type) (calloc(1, sizeof(type)))
+
+#define countof(x) (sizeof(x)/sizeof((x)[0]))
+
+/* Constant length map functions */
+#define map_getg(map, test) ({ \
+       int i; \
+       for (i = 0; i < countof(map) && !(test); i++); \
+       i < countof(map) ? &map[i] : NULL ; \
+})
+
+#define map_get(m,k)    map_getg(m,k==*((typeof(k)*)&m[i]))
+#define map_getr(m,k)   map_getg(m,k==*(((typeof(k)*)&m[i+1])-1))
+#define map_getk(m,k,a) map_getg(m,k==m[i].a)
+
+/* Linked lists */
+typedef struct list {
+       struct list *prev;
+       struct list *next;
+       void   *data;
+} list_t;
+
+list_t *list_insert(list_t *after, void *data);
+
+void list_insert_after(list_t *after, void *data);
+
+list_t *list_append(list_t *before, void *data);
+
+list_t *list_remove(list_t *head, list_t *item);
+
+int list_length(list_t *item);
+
+list_t *list_last(list_t *list);
+
+list_t *list_find(list_t *list, void *data);
+
+/* Misc */
+int error(char *fmt, ...);