Don't add references to objects we couldn't find.
[git/git.git] / commit.c
1 #include "commit.h"
2 #include "cache.h"
3 #include <string.h>
4 #include <limits.h>
5
6 const char *commit_type = "commit";
7
8 struct commit *lookup_commit(unsigned char *sha1)
9 {
10 struct object *obj = lookup_object(sha1);
11 if (!obj) {
12 struct commit *ret = malloc(sizeof(struct commit));
13 memset(ret, 0, sizeof(struct commit));
14 created_object(sha1, &ret->object);
15 ret->object.type = commit_type;
16 return ret;
17 }
18 if (obj->type != commit_type) {
19 error("Object %s is a %s, not a commit",
20 sha1_to_hex(sha1), obj->type);
21 return NULL;
22 }
23 return (struct commit *) obj;
24 }
25
26 static unsigned long parse_commit_date(const char *buf)
27 {
28 unsigned long date;
29
30 if (memcmp(buf, "author", 6))
31 return 0;
32 while (*buf++ != '\n')
33 /* nada */;
34 if (memcmp(buf, "committer", 9))
35 return 0;
36 while (*buf++ != '>')
37 /* nada */;
38 date = strtoul(buf, NULL, 10);
39 if (date == ULONG_MAX)
40 date = 0;
41 return date;
42 }
43
44 int parse_commit(struct commit *item)
45 {
46 char type[20];
47 void * buffer, *bufptr;
48 unsigned long size;
49 unsigned char parent[20];
50 if (item->object.parsed)
51 return 0;
52 item->object.parsed = 1;
53 buffer = bufptr = read_sha1_file(item->object.sha1, type, &size);
54 if (!buffer)
55 return error("Could not read %s",
56 sha1_to_hex(item->object.sha1));
57 if (strcmp(type, commit_type))
58 return error("Object %s not a commit",
59 sha1_to_hex(item->object.sha1));
60 get_sha1_hex(bufptr + 5, parent);
61 item->tree = lookup_tree(parent);
62 if (item->tree)
63 add_ref(&item->object, &item->tree->object);
64 bufptr += 46; /* "tree " + "hex sha1" + "\n" */
65 while (!memcmp(bufptr, "parent ", 7) &&
66 !get_sha1_hex(bufptr + 7, parent)) {
67 struct commit *new_parent = lookup_commit(parent);
68 if (new_parent) {
69 commit_list_insert(new_parent, &item->parents);
70 add_ref(&item->object, &new_parent->object);
71 }
72 bufptr += 48;
73 }
74 item->date = parse_commit_date(bufptr);
75 free(buffer);
76 return 0;
77 }
78
79 void commit_list_insert(struct commit *item, struct commit_list **list_p)
80 {
81 struct commit_list *new_list = malloc(sizeof(struct commit_list));
82 new_list->item = item;
83 new_list->next = *list_p;
84 *list_p = new_list;
85 }
86
87 void free_commit_list(struct commit_list *list)
88 {
89 while (list) {
90 struct commit_list *temp = list;
91 list = temp->next;
92 free(temp);
93 }
94 }
95
96 static void insert_by_date(struct commit_list **list, struct commit *item)
97 {
98 struct commit_list **pp = list;
99 struct commit_list *p;
100 while ((p = *pp) != NULL) {
101 if (p->item->date < item->date) {
102 break;
103 }
104 pp = &p->next;
105 }
106 commit_list_insert(item, pp);
107 }
108
109
110 void sort_by_date(struct commit_list **list)
111 {
112 struct commit_list *ret = NULL;
113 while (*list) {
114 insert_by_date(&ret, (*list)->item);
115 *list = (*list)->next;
116 }
117 *list = ret;
118 }
119
120 struct commit *pop_most_recent_commit(struct commit_list **list,
121 unsigned int mark)
122 {
123 struct commit *ret = (*list)->item;
124 struct commit_list *parents = ret->parents;
125 struct commit_list *old = *list;
126
127 *list = (*list)->next;
128 free(old);
129
130 while (parents) {
131 struct commit *commit = parents->item;
132 parse_commit(commit);
133 if (!(commit->object.flags & mark)) {
134 commit->object.flags |= mark;
135 insert_by_date(list, commit);
136 }
137 parents = parents->next;
138 }
139 return ret;
140 }