[PATCH] delta check
[git/git.git] / commit.c
CommitLineData
961784ee 1#include "tag.h"
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2#include "commit.h"
3#include "cache.h"
4#include <string.h>
b2c00718 5#include <limits.h>
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6
7const char *commit_type = "commit";
8
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LT
9static struct commit *check_commit(struct object *obj, unsigned char *sha1)
10{
11 if (obj->type != commit_type) {
12 error("Object %s is a %s, not a commit",
13 sha1_to_hex(sha1), obj->type);
14 return NULL;
15 }
16 return (struct commit *) obj;
17}
18
19struct commit *lookup_commit_reference(unsigned char *sha1)
20{
21 struct object *obj = parse_object(sha1);
22
23 if (!obj)
24 return NULL;
25 if (obj->type == tag_type)
26 obj = ((struct tag *)obj)->tagged;
27 return check_commit(obj, sha1);
28}
29
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30struct commit *lookup_commit(unsigned char *sha1)
31{
32 struct object *obj = lookup_object(sha1);
33 if (!obj) {
812666c8 34 struct commit *ret = xmalloc(sizeof(struct commit));
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35 memset(ret, 0, sizeof(struct commit));
36 created_object(sha1, &ret->object);
d32987be 37 ret->object.type = commit_type;
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38 return ret;
39 }
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40 if (!obj->type)
41 obj->type = commit_type;
961784ee 42 return check_commit(obj, sha1);
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43}
44
45static unsigned long parse_commit_date(const char *buf)
46{
47 unsigned long date;
48
49 if (memcmp(buf, "author", 6))
50 return 0;
51 while (*buf++ != '\n')
52 /* nada */;
53 if (memcmp(buf, "committer", 9))
54 return 0;
55 while (*buf++ != '>')
56 /* nada */;
57 date = strtoul(buf, NULL, 10);
58 if (date == ULONG_MAX)
59 date = 0;
60 return date;
61}
62
bd2c39f5 63int parse_commit_buffer(struct commit *item, void *buffer, unsigned long size)
175785e5 64{
bd2c39f5 65 void *bufptr = buffer;
175785e5 66 unsigned char parent[20];
bd2c39f5 67
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68 if (item->object.parsed)
69 return 0;
70 item->object.parsed = 1;
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71 get_sha1_hex(bufptr + 5, parent);
72 item->tree = lookup_tree(parent);
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73 if (item->tree)
74 add_ref(&item->object, &item->tree->object);
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75 bufptr += 46; /* "tree " + "hex sha1" + "\n" */
76 while (!memcmp(bufptr, "parent ", 7) &&
77 !get_sha1_hex(bufptr + 7, parent)) {
dd97f850 78 struct commit *new_parent = lookup_commit(parent);
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79 if (new_parent) {
80 commit_list_insert(new_parent, &item->parents);
81 add_ref(&item->object, &new_parent->object);
82 }
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83 bufptr += 48;
84 }
85 item->date = parse_commit_date(bufptr);
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86 return 0;
87}
88
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89int parse_commit(struct commit *item)
90{
91 char type[20];
92 void *buffer;
93 unsigned long size;
94 int ret;
95
96 if (item->object.parsed)
97 return 0;
98 buffer = read_sha1_file(item->object.sha1, type, &size);
99 if (!buffer)
100 return error("Could not read %s",
101 sha1_to_hex(item->object.sha1));
102 if (strcmp(type, commit_type)) {
103 free(buffer);
104 return error("Object %s not a commit",
105 sha1_to_hex(item->object.sha1));
106 }
107 ret = parse_commit_buffer(item, buffer, size);
108 free(buffer);
109 return ret;
110}
111
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112void commit_list_insert(struct commit *item, struct commit_list **list_p)
113{
812666c8 114 struct commit_list *new_list = xmalloc(sizeof(struct commit_list));
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115 new_list->item = item;
116 new_list->next = *list_p;
117 *list_p = new_list;
118}
119
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120void free_commit_list(struct commit_list *list)
121{
122 while (list) {
123 struct commit_list *temp = list;
124 list = temp->next;
125 free(temp);
126 }
127}
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128
129static void insert_by_date(struct commit_list **list, struct commit *item)
130{
131 struct commit_list **pp = list;
132 struct commit_list *p;
133 while ((p = *pp) != NULL) {
134 if (p->item->date < item->date) {
135 break;
136 }
137 pp = &p->next;
138 }
139 commit_list_insert(item, pp);
140}
141
142
143void sort_by_date(struct commit_list **list)
144{
145 struct commit_list *ret = NULL;
146 while (*list) {
147 insert_by_date(&ret, (*list)->item);
148 *list = (*list)->next;
149 }
150 *list = ret;
151}
152
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153struct commit *pop_most_recent_commit(struct commit_list **list,
154 unsigned int mark)
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155{
156 struct commit *ret = (*list)->item;
157 struct commit_list *parents = ret->parents;
158 struct commit_list *old = *list;
159
160 *list = (*list)->next;
161 free(old);
162
163 while (parents) {
4056c091 164 struct commit *commit = parents->item;
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165 parse_commit(commit);
166 if (!(commit->object.flags & mark)) {
167 commit->object.flags |= mark;
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168 insert_by_date(list, commit);
169 }
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170 parents = parents->next;
171 }
172 return ret;
173}