+#include "tag.h"
#include "commit.h"
#include "cache.h"
-#include <string.h>
-#include <limits.h>
const char *commit_type = "commit";
+static struct commit *check_commit(struct object *obj, unsigned char *sha1)
+{
+ if (obj->type != commit_type) {
+ error("Object %s is a %s, not a commit",
+ sha1_to_hex(sha1), obj->type);
+ return NULL;
+ }
+ return (struct commit *) obj;
+}
+
+struct commit *lookup_commit_reference(unsigned char *sha1)
+{
+ struct object *obj = parse_object(sha1);
+
+ if (!obj)
+ return NULL;
+ if (obj->type == tag_type)
+ obj = ((struct tag *)obj)->tagged;
+ return check_commit(obj, sha1);
+}
+
struct commit *lookup_commit(unsigned char *sha1)
{
struct object *obj = lookup_object(sha1);
if (!obj) {
- struct commit *ret = malloc(sizeof(struct commit));
+ struct commit *ret = xmalloc(sizeof(struct commit));
memset(ret, 0, sizeof(struct commit));
created_object(sha1, &ret->object);
+ ret->object.type = commit_type;
return ret;
}
- if (obj->parsed && obj->type != commit_type) {
- error("Object %s is a %s, not a commit",
- sha1_to_hex(sha1), obj->type);
- return NULL;
- }
- return (struct commit *) obj;
+ if (!obj->type)
+ obj->type = commit_type;
+ return check_commit(obj, sha1);
}
static unsigned long parse_commit_date(const char *buf)
return date;
}
-int parse_commit(struct commit *item)
+int parse_commit_buffer(struct commit *item, void *buffer, unsigned long size)
{
- char type[20];
- void * buffer, *bufptr;
- unsigned long size;
+ void *bufptr = buffer;
unsigned char parent[20];
+
if (item->object.parsed)
return 0;
item->object.parsed = 1;
- buffer = bufptr = read_sha1_file(item->object.sha1, type, &size);
- if (!buffer)
- return error("Could not read %s",
- sha1_to_hex(item->object.sha1));
- if (strcmp(type, commit_type))
- return error("Object %s not a commit",
- sha1_to_hex(item->object.sha1));
- item->object.type = commit_type;
get_sha1_hex(bufptr + 5, parent);
item->tree = lookup_tree(parent);
- add_ref(&item->object, &item->tree->object);
+ if (item->tree)
+ add_ref(&item->object, &item->tree->object);
bufptr += 46; /* "tree " + "hex sha1" + "\n" */
while (!memcmp(bufptr, "parent ", 7) &&
!get_sha1_hex(bufptr + 7, parent)) {
- struct commit_list *new_parent =
- malloc(sizeof(struct commit_list));
- new_parent->next = item->parents;
- new_parent->item = lookup_commit(parent);
- add_ref(&item->object, &new_parent->item->object);
- item->parents = new_parent;
+ struct commit *new_parent = lookup_commit(parent);
+ if (new_parent) {
+ commit_list_insert(new_parent, &item->parents);
+ add_ref(&item->object, &new_parent->object);
+ }
bufptr += 48;
}
item->date = parse_commit_date(bufptr);
- free(buffer);
return 0;
}
+int parse_commit(struct commit *item)
+{
+ char type[20];
+ void *buffer;
+ unsigned long size;
+ int ret;
+
+ if (item->object.parsed)
+ return 0;
+ buffer = read_sha1_file(item->object.sha1, type, &size);
+ if (!buffer)
+ return error("Could not read %s",
+ sha1_to_hex(item->object.sha1));
+ if (strcmp(type, commit_type)) {
+ free(buffer);
+ return error("Object %s not a commit",
+ sha1_to_hex(item->object.sha1));
+ }
+ ret = parse_commit_buffer(item, buffer, size);
+ if (!ret) {
+ item->buffer = buffer;
+ return 0;
+ }
+ free(buffer);
+ return ret;
+}
+
+void commit_list_insert(struct commit *item, struct commit_list **list_p)
+{
+ struct commit_list *new_list = xmalloc(sizeof(struct commit_list));
+ new_list->item = item;
+ new_list->next = *list_p;
+ *list_p = new_list;
+}
+
void free_commit_list(struct commit_list *list)
{
while (list) {
free(temp);
}
}
+
+static void insert_by_date(struct commit_list **list, struct commit *item)
+{
+ struct commit_list **pp = list;
+ struct commit_list *p;
+ while ((p = *pp) != NULL) {
+ if (p->item->date < item->date) {
+ break;
+ }
+ pp = &p->next;
+ }
+ commit_list_insert(item, pp);
+}
+
+
+void sort_by_date(struct commit_list **list)
+{
+ struct commit_list *ret = NULL;
+ while (*list) {
+ insert_by_date(&ret, (*list)->item);
+ *list = (*list)->next;
+ }
+ *list = ret;
+}
+
+struct commit *pop_most_recent_commit(struct commit_list **list,
+ unsigned int mark)
+{
+ struct commit *ret = (*list)->item;
+ struct commit_list *parents = ret->parents;
+ struct commit_list *old = *list;
+
+ *list = (*list)->next;
+ free(old);
+
+ while (parents) {
+ struct commit *commit = parents->item;
+ parse_commit(commit);
+ if (!(commit->object.flags & mark)) {
+ commit->object.flags |= mark;
+ insert_by_date(list, commit);
+ }
+ parents = parents->next;
+ }
+ return ret;
+}