Add Win32 support for tags and multiple monitors

[wmpus] / util.c

diff --git a/util.c b/util.c
index 2099953ddce60d2832e9fe7f6c814e82e4ebfed9..18f98dc4f17859e5c5724a8d25ed39271ba89e70 100644 (file)
--- a/util.c
+++ b/util.c
@@ -1,5 +1,6 @@
 #include <stdio.h>
 #include <stdlib.h>
+#include <stdarg.h>
 
 #include "util.h"
 
@@ -10,14 +11,26 @@ list_t *list_insert(list_t *next, void *data)
        node->next = next;
        node->prev = next ? next->prev : NULL;
        if (node->next) node->next->prev = node;
-       if (node->prev) node->next->next = node;
+       if (node->prev) node->prev->next = node;
        return node;
 }
 
+void list_insert_after(list_t *prev, void *data)
+{
+       // prev must be valid,
+       // as we cannot return the original list head
+       list_t *node = new0(list_t);
+       node->data = data;
+       node->prev = prev;
+       node->next = prev->next;
+       prev->next = node;
+       if (node->next) node->next->prev = node;
+}
+
 list_t *list_append(list_t *head, void *data)
 {
        list_t *last = head;
-       while (last->next)
+       while (last && last->next)
                last = last->next;
        list_t *node = new0(list_t);
        node->data = data;
@@ -44,6 +57,30 @@ int list_length(list_t *node)
        return len;
 }
 
-void list_move(list_t *node, int offset)
+list_t *list_last(list_t *list)
+{
+       while (list && list->next)
+               list = list->next;
+       return list;
+}
+
+list_t *list_find(list_t *list, void *data)
+{
+       for (list_t *cur = list; cur; cur = cur->next)
+               if (cur->data == data)
+                       return cur;
+       return NULL;
+}
+
+/* Misc */
+int error(char *fmt, ...)
 {
+       va_list ap;
+       va_start(ap, fmt);
+       fprintf(stderr, "Error: ");
+       vfprintf(stderr, fmt, ap);
+       fprintf(stderr, "\n");
+       va_end(ap);
+       exit(1);
+       return 0;
 }