Google Git
Sign in
chromium / external / github.com / git / git / refs/tags/v0.99.9c / . / tag.c
blob: e574c4b7a496d3a1d113801214197a04d5c74d42 [file] [log] [blame]
Daniel Barkalow2636f612005-04-28 14:46:33[diff] [blame]1#include "tag.h"
2#include "cache.h"
3
4const char *tag_type = "tag";
5
Junio C Hamano9534f402005-11-02 23:19:13[diff] [blame]6struct object *deref_tag(struct object *o, const char *warn, int warnlen)
Junio C Hamano37fde872005-08-05 07:47:56[diff] [blame]7{
8 while (o && o->type == tag_type)
9 o = parse_object(((struct tag *)o)->tagged->sha1);
Junio C Hamano9534f402005-11-02 23:19:13[diff] [blame]10 if (!o && warn) {
11 if (!warnlen)
12 warnlen = strlen(warn);
13 error("missing object referenced by '%.*s'", warnlen, warn);
14 }
Junio C Hamano37fde872005-08-05 07:47:56[diff] [blame]15 return o;
16}
17
Jason McMullan5d6ccf52005-06-03 15:05:39[diff] [blame]18struct tag *lookup_tag(const unsigned char *sha1)
Daniel Barkalow2636f612005-04-28 14:46:33[diff] [blame]19{
20 struct object *obj = lookup_object(sha1);
21 if (!obj) {
22 struct tag *ret = xmalloc(sizeof(struct tag));
23 memset(ret, 0, sizeof(struct tag));
24 created_object(sha1, &ret->object);
25 ret->object.type = tag_type;
26 return ret;
27 }
Nicolas Pitred1af0022005-05-20 20:59:17[diff] [blame]28 if (!obj->type)
29 obj->type = tag_type;
Daniel Barkalow2636f612005-04-28 14:46:33[diff] [blame]30 if (obj->type != tag_type) {
31 error("Object %s is a %s, not a tree",
32 sha1_to_hex(sha1), obj->type);
33 return NULL;
34 }
35 return (struct tag *) obj;
36}
37
Nicolas Pitrebd2c39f2005-05-06 17:48:34[diff] [blame]38int parse_tag_buffer(struct tag *item, void *data, unsigned long size)
Daniel Barkalow2636f612005-04-28 14:46:33[diff] [blame]39{
Edgar Toernigae200ee2005-04-30 16:51:03[diff] [blame]40 int typelen, taglen;
41 unsigned char object[20];
42 const char *type_line, *tag_line, *sig_line;
Daniel Barkalow89e42022005-06-22 00:35:10[diff] [blame]43 char type[20];
Edgar Toernigae200ee2005-04-30 16:51:03[diff] [blame]44
Daniel Barkalow2636f612005-04-28 14:46:33[diff] [blame]45 if (item->object.parsed)
46 return 0;
47 item->object.parsed = 1;
Daniel Barkalow2636f612005-04-28 14:46:33[diff] [blame]48
Daniel Barkalow2636f612005-04-28 14:46:33[diff] [blame]49 if (size < 64)
Nicolas Pitrebd2c39f2005-05-06 17:48:34[diff] [blame]50 return -1;
Daniel Barkalow2636f612005-04-28 14:46:33[diff] [blame]51 if (memcmp("object ", data, 7) || get_sha1_hex(data + 7, object))
Nicolas Pitrebd2c39f2005-05-06 17:48:34[diff] [blame]52 return -1;
Daniel Barkalow2636f612005-04-28 14:46:33[diff] [blame]53
Daniel Barkalow2636f612005-04-28 14:46:33[diff] [blame]54 type_line = data + 48;
55 if (memcmp("\ntype ", type_line-1, 6))
Nicolas Pitrebd2c39f2005-05-06 17:48:34[diff] [blame]56 return -1;
Daniel Barkalow2636f612005-04-28 14:46:33[diff] [blame]57
58 tag_line = strchr(type_line, '\n');
59 if (!tag_line || memcmp("tag ", ++tag_line, 4))
Nicolas Pitrebd2c39f2005-05-06 17:48:34[diff] [blame]60 return -1;
Daniel Barkalow2636f612005-04-28 14:46:33[diff] [blame]61
62 sig_line = strchr(tag_line, '\n');
63 if (!sig_line)
Nicolas Pitrebd2c39f2005-05-06 17:48:34[diff] [blame]64 return -1;
Daniel Barkalow2636f612005-04-28 14:46:33[diff] [blame]65 sig_line++;
66
67 typelen = tag_line - type_line - strlen("type \n");
68 if (typelen >= 20)
Nicolas Pitrebd2c39f2005-05-06 17:48:34[diff] [blame]69 return -1;
Daniel Barkalow89e42022005-06-22 00:35:10[diff] [blame]70 memcpy(type, type_line + 5, typelen);
71 type[typelen] = '\0';
Daniel Barkalow2636f612005-04-28 14:46:33[diff] [blame]72 taglen = sig_line - tag_line - strlen("tag \n");
73 item->tag = xmalloc(taglen + 1);
74 memcpy(item->tag, tag_line + 4, taglen);
75 item->tag[taglen] = '\0';
76
Daniel Barkalow89e42022005-06-22 00:35:10[diff] [blame]77 item->tagged = lookup_object_type(object, type);
78 if (item->tagged)
79 add_ref(&item->object, item->tagged);
80
Daniel Barkalow2636f612005-04-28 14:46:33[diff] [blame]81 return 0;
Nicolas Pitrebd2c39f2005-05-06 17:48:34[diff] [blame]82}
Sergey Vlasov13019d42005-05-04 17:44:15[diff] [blame]83
Nicolas Pitrebd2c39f2005-05-06 17:48:34[diff] [blame]84int parse_tag(struct tag *item)
85{
86 char type[20];
87 void *data;
88 unsigned long size;
89 int ret;
90
91 if (item->object.parsed)
92 return 0;
93 data = read_sha1_file(item->object.sha1, type, &size);
94 if (!data)
95 return error("Could not read %s",
96 sha1_to_hex(item->object.sha1));
97 if (strcmp(type, tag_type)) {
98 free(data);
99 return error("Object %s not a tag",
100 sha1_to_hex(item->object.sha1));
101 }
102 ret = parse_tag_buffer(item, data, size);
Sergey Vlasov13019d42005-05-04 17:44:15[diff] [blame]103 free(data);
Nicolas Pitrebd2c39f2005-05-06 17:48:34[diff] [blame]104 return ret;
Daniel Barkalow2636f612005-04-28 14:46:33[diff] [blame]105}