[PATCH] Fix broken diff-cache output on added files
[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                 return ret;
16         }
17         if (obj->parsed && obj->type != commit_type) {
18                 error("Object %s is a %s, not a commit", 
19                       sha1_to_hex(sha1), obj->type);
20                 return NULL;
21         }
22         return (struct commit *) obj;
23 }
24
25 static unsigned long parse_commit_date(const char *buf)
26 {
27         unsigned long date;
28
29         if (memcmp(buf, "author", 6))
30                 return 0;
31         while (*buf++ != '\n')
32                 /* nada */;
33         if (memcmp(buf, "committer", 9))
34                 return 0;
35         while (*buf++ != '>')
36                 /* nada */;
37         date = strtoul(buf, NULL, 10);
38         if (date == ULONG_MAX)
39                 date = 0;
40         return date;
41 }
42
43 int parse_commit(struct commit *item)
44 {
45         char type[20];
46         void * buffer, *bufptr;
47         unsigned long size;
48         unsigned char parent[20];
49         if (item->object.parsed)
50                 return 0;
51         item->object.parsed = 1;
52         buffer = bufptr = read_sha1_file(item->object.sha1, type, &size);
53         if (!buffer)
54                 return error("Could not read %s",
55                              sha1_to_hex(item->object.sha1));
56         if (strcmp(type, commit_type))
57                 return error("Object %s not a commit",
58                              sha1_to_hex(item->object.sha1));
59         item->object.type = commit_type;
60         get_sha1_hex(bufptr + 5, parent);
61         item->tree = lookup_tree(parent);
62         add_ref(&item->object, &item->tree->object);
63         bufptr += 46; /* "tree " + "hex sha1" + "\n" */
64         while (!memcmp(bufptr, "parent ", 7) &&
65                !get_sha1_hex(bufptr + 7, parent)) {
66                 struct commit_list *new_parent = 
67                         malloc(sizeof(struct commit_list));
68                 new_parent->next = item->parents;
69                 new_parent->item = lookup_commit(parent);
70                 add_ref(&item->object, &new_parent->item->object);
71                 item->parents = new_parent;
72                 bufptr += 48;
73         }
74         item->date = parse_commit_date(bufptr);
75         free(buffer);
76         return 0;
77 }
78
79 void free_commit_list(struct commit_list *list)
80 {
81         while (list) {
82                 struct commit_list *temp = list;
83                 list = temp->next;
84                 free(temp);
85         }
86 }