/* PSPP - a program for statistical analysis.
- Copyright (C) 2007 Free Software Foundation, Inc.
+ Copyright (C) 2007, 2009 Free Software Foundation, Inc.
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
return true;
}
+/* Scans RS for and deletes the first contiguous run of REQUEST
+ 1-bits. If successful, sets *START to the position of the
+ first 1-bit deleted and returns true If RS does not contain a
+ run of REQUEST or more contiguous 1-bits, returns false and
+ does not modify RS. */
+bool
+range_set_allocate_fully (struct range_set *rs, unsigned long int request,
+ unsigned long int *start)
+{
+ struct range_set_node *node;
+
+ assert (request > 0);
+
+ for (node = first_node (rs); node != NULL; node = next_node (rs, node))
+ {
+ unsigned long int node_width = node->end - node->start;
+ if (node_width >= request)
+ {
+ *start = node->start;
+ if (node_width > request)
+ node->start += request;
+ else
+ delete_node (rs, node);
+ rs->cache_end = 0;
+ return true;
+ }
+ }
+ return false;
+}
+
/* Returns true if there is a 1-bit at the given POSITION in RS,
false otherwise. */
bool