* Sebastian Hammer, Adam Dickmeiss
*
* $Log: odr_mem.c,v $
- * Revision 1.1 1995-03-14 10:27:40 quinn
+ * Revision 1.2 1995-03-17 10:17:52 quinn
+ * Added memory management.
+ *
+ * Revision 1.1 1995/03/14 10:27:40 quinn
* Modified makefile to use common lib
* Beginning to add memory management to odr
*
- *
*/
#include <stdlib.h>
-
#include <odr.h>
-char *odr_malloc(ODR o, int size)
+#define ODR_MEM_CHUNK (10*1024)
+
+typedef struct odr_memblock
+{
+ char *buf;
+ int size;
+ int top;
+ struct odr_memblock *next;
+} odr_memblock;
+
+static odr_memblock *freelist = 0;
+
+static void free_block(odr_memblock *p)
+{
+ p->next = freelist;
+ freelist = p;
+}
+
+static odr_memblock *get_block(int size)
{
- return malloc(size); /* REPLACE WITH NIBBLE MALLOC!! */
+ odr_memblock *r, *l;
+
+ for (r = freelist, l = 0; r; l = r, r = r->next)
+ if (r->size >= size)
+ break;
+ if (r)
+ if (l)
+ l->next = r->next;
+ else
+ freelist = r->next;
+ else
+ {
+ int get = ODR_MEM_CHUNK;
+
+ if (get < size)
+ get = size;
+ if (!(r = malloc(sizeof(*r))))
+ return 0;
+ if (!(r->buf = malloc(r->size = get)))
+ return 0;
+ }
+ r->top = 0;
+ return r;
+}
+
+void odr_release_mem(odr_memblock *p)
+{
+ odr_memblock *t;
+
+ while (p)
+ {
+ t = p;
+ p = p->next;
+ free_block(t);
+ }
+}
+
+void *odr_malloc(ODR o, int size)
+{
+ struct odr_memblock *p = o->mem;
+ char *r;
+
+ if (!p || p->size - p->top < size)
+ if (!(p = get_block(size)))
+ {
+ o->error = OMEMORY;
+ return 0;
+ }
+ else
+ {
+ p->next = o->mem;
+ o->mem = p;
+ }
+ r = p->buf + p->top;
+ p->top += (size + (sizeof(long) - 1)) & ~(sizeof(long) - 1);
+ return r;
}