submodule: Use cat instead of echo to avoid DOS line-endings
[git/dscho.git] / tag.c
blob3aa186df628331e74e8a84d3cc2d313f4518a626
1 #include "cache.h"
2 #include "tag.h"
3 #include "commit.h"
4 #include "tree.h"
5 #include "blob.h"
7 #define PGP_SIGNATURE "-----BEGIN PGP SIGNATURE-----"
8 #define PGP_MESSAGE "-----BEGIN PGP MESSAGE-----"
10 const char *tag_type = "tag";
12 struct object *deref_tag(struct object *o, const char *warn, int warnlen)
14 while (o && o->type == OBJ_TAG)
15 if (((struct tag *)o)->tagged)
16 o = parse_object(((struct tag *)o)->tagged->sha1);
17 else
18 o = NULL;
19 if (!o && warn) {
20 if (!warnlen)
21 warnlen = strlen(warn);
22 error("missing object referenced by '%.*s'", warnlen, warn);
24 return o;
27 struct tag *lookup_tag(const unsigned char *sha1)
29 struct object *obj = lookup_object(sha1);
30 if (!obj)
31 return create_object(sha1, OBJ_TAG, alloc_tag_node());
32 if (!obj->type)
33 obj->type = OBJ_TAG;
34 if (obj->type != OBJ_TAG) {
35 error("Object %s is a %s, not a tag",
36 sha1_to_hex(sha1), typename(obj->type));
37 return NULL;
39 return (struct tag *) obj;
42 static unsigned long parse_tag_date(const char *buf, const char *tail)
44 const char *dateptr;
46 while (buf < tail && *buf++ != '>')
47 /* nada */;
48 if (buf >= tail)
49 return 0;
50 dateptr = buf;
51 while (buf < tail && *buf++ != '\n')
52 /* nada */;
53 if (buf >= tail)
54 return 0;
55 /* dateptr < buf && buf[-1] == '\n', so strtoul will stop at buf-1 */
56 return strtoul(dateptr, NULL, 10);
59 int parse_tag_buffer(struct tag *item, const void *data, unsigned long size)
61 unsigned char sha1[20];
62 char type[20];
63 const char *bufptr = data;
64 const char *tail = bufptr + size;
65 const char *nl;
67 if (item->object.parsed)
68 return 0;
69 item->object.parsed = 1;
71 if (size < 64)
72 return -1;
73 if (memcmp("object ", bufptr, 7) || get_sha1_hex(bufptr + 7, sha1) || bufptr[47] != '\n')
74 return -1;
75 bufptr += 48; /* "object " + sha1 + "\n" */
77 if (prefixcmp(bufptr, "type "))
78 return -1;
79 bufptr += 5;
80 nl = memchr(bufptr, '\n', tail - bufptr);
81 if (!nl || sizeof(type) <= (nl - bufptr))
82 return -1;
83 strncpy(type, bufptr, nl - bufptr);
84 type[nl - bufptr] = '\0';
85 bufptr = nl + 1;
87 if (!strcmp(type, blob_type)) {
88 item->tagged = &lookup_blob(sha1)->object;
89 } else if (!strcmp(type, tree_type)) {
90 item->tagged = &lookup_tree(sha1)->object;
91 } else if (!strcmp(type, commit_type)) {
92 item->tagged = &lookup_commit(sha1)->object;
93 } else if (!strcmp(type, tag_type)) {
94 item->tagged = &lookup_tag(sha1)->object;
95 } else {
96 error("Unknown type %s", type);
97 item->tagged = NULL;
100 if (bufptr + 4 < tail && !prefixcmp(bufptr, "tag "))
101 ; /* good */
102 else
103 return -1;
104 bufptr += 4;
105 nl = memchr(bufptr, '\n', tail - bufptr);
106 if (!nl)
107 return -1;
108 item->tag = xmemdupz(bufptr, nl - bufptr);
109 bufptr = nl + 1;
111 if (bufptr + 7 < tail && !prefixcmp(bufptr, "tagger "))
112 item->date = parse_tag_date(bufptr, tail);
113 else
114 item->date = 0;
116 return 0;
119 int parse_tag(struct tag *item)
121 enum object_type type;
122 void *data;
123 unsigned long size;
124 int ret;
126 if (item->object.parsed)
127 return 0;
128 data = read_sha1_file(item->object.sha1, &type, &size);
129 if (!data)
130 return error("Could not read %s",
131 sha1_to_hex(item->object.sha1));
132 if (type != OBJ_TAG) {
133 free(data);
134 return error("Object %s not a tag",
135 sha1_to_hex(item->object.sha1));
137 ret = parse_tag_buffer(item, data, size);
138 free(data);
139 return ret;
143 * Look at a signed tag object, and return the offset where
144 * the embedded detached signature begins, or the end of the
145 * data when there is no such signature.
147 size_t parse_signature(const char *buf, unsigned long size)
149 char *eol;
150 size_t len = 0;
151 while (len < size && prefixcmp(buf + len, PGP_SIGNATURE) &&
152 prefixcmp(buf + len, PGP_MESSAGE)) {
153 eol = memchr(buf + len, '\n', size - len);
154 len += eol ? eol - (buf + len) + 1 : size - len;
156 return len;