[PATCH] Implementations of parsing functions

This implements the parsing functions.

Signed-Off-By: Daniel Barkalow <barkalow@iabervon.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

object.c

@@ -0,0 +1,96 @@
+#include "object.h"
+#include "cache.h"
+#include <stdlib.h>
+#include <string.h>
+
+struct object **objs;
+int nr_objs;
+static int obj_allocs;
+
+static int find_object(unsigned char *sha1)
+{
+	int first = 0, last = nr_objs;
+
+        while (first < last) {
+                int next = (first + last) / 2;
+                struct object *obj = objs[next];
+                int cmp;
+
+                cmp = memcmp(sha1, obj->sha1, 20);
+                if (!cmp)
+                        return next;
+                if (cmp < 0) {
+                        last = next;
+                        continue;
+                }
+                first = next+1;
+        }
+        return -first-1;
+}
+
+struct object *lookup_object(unsigned char *sha1)
+{
+	int pos = find_object(sha1);
+	if (pos >= 0)
+		return objs[pos];
+	return NULL;
+}
+
+void created_object(unsigned char *sha1, struct object *obj)
+{
+	int pos = find_object(sha1);
+
+	obj->parsed = 0;
+	memcpy(obj->sha1, sha1, 20);
+	obj->type = NULL;
+	obj->refs = NULL;
+	obj->used = 0;
+
+	if (pos >= 0)
+		die("Inserting %s twice\n", sha1_to_hex(sha1));
+	pos = -pos-1;
+
+	if (obj_allocs == nr_objs) {
+		obj_allocs = alloc_nr(obj_allocs);
+		objs = realloc(objs, obj_allocs * sizeof(struct object *));
+	}
+
+	/* Insert it into the right place */
+	memmove(objs + pos + 1, objs + pos, (nr_objs - pos) * 
+		sizeof(struct object *));
+
+	objs[pos] = obj;
+	nr_objs++;
+}
+
+void add_ref(struct object *refer, struct object *target)
+{
+	struct object_list **pp = &refer->refs;
+	struct object_list *p;
+	
+	while ((p = *pp) != NULL) {
+		if (p->item == target)
+			return;
+		pp = &p->next;
+	}
+
+	target->used = 1;
+	p = malloc(sizeof(*p));
+	p->item = target;
+	p->next = NULL;
+	*pp = p;
+}
+
+void mark_reachable(struct object *obj, unsigned int mask)
+{
+	struct object_list *p = obj->refs;
+
+	/* If we've been here already, don't bother */
+	if (obj->flags & mask)
+		return;
+	obj->flags |= mask;
+	while (p) {
+		mark_reachable(p->item, mask);
+		p = p->next;
+	}
+}