git-diff-tree: clean up output
[git/git.git] / tag.c
CommitLineData
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1#include "tag.h"
2#include "cache.h"
3
4const char *tag_type = "tag";
5
6struct tag *lookup_tag(unsigned char *sha1)
7{
8 struct object *obj = lookup_object(sha1);
9 if (!obj) {
10 struct tag *ret = xmalloc(sizeof(struct tag));
11 memset(ret, 0, sizeof(struct tag));
12 created_object(sha1, &ret->object);
13 ret->object.type = tag_type;
14 return ret;
15 }
16 if (obj->type != tag_type) {
17 error("Object %s is a %s, not a tree",
18 sha1_to_hex(sha1), obj->type);
19 return NULL;
20 }
21 return (struct tag *) obj;
22}
23
24int parse_tag(struct tag *item)
25{
26 char type[20];
27 void *data, *bufptr;
28 unsigned long size;
ae200ee5
ET
29 int typelen, taglen;
30 unsigned char object[20];
31 const char *type_line, *tag_line, *sig_line;
32
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DB
33 if (item->object.parsed)
34 return 0;
35 item->object.parsed = 1;
36 data = bufptr = read_sha1_file(item->object.sha1, type, &size);
37 if (!data)
38 return error("Could not read %s",
39 sha1_to_hex(item->object.sha1));
13019d41
SV
40 if (strcmp(type, tag_type)) {
41 free(data);
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DB
42 return error("Object %s not a tag",
43 sha1_to_hex(item->object.sha1));
13019d41 44 }
2636f614 45
2636f614 46 if (size < 64)
13019d41 47 goto err;
2636f614 48 if (memcmp("object ", data, 7) || get_sha1_hex(data + 7, object))
13019d41 49 goto err;
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50
51 item->tagged = parse_object(object);
770896e5
LT
52 if (item->tagged)
53 add_ref(&item->object, item->tagged);
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54
55 type_line = data + 48;
56 if (memcmp("\ntype ", type_line-1, 6))
13019d41 57 goto err;
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58
59 tag_line = strchr(type_line, '\n');
60 if (!tag_line || memcmp("tag ", ++tag_line, 4))
13019d41 61 goto err;
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62
63 sig_line = strchr(tag_line, '\n');
64 if (!sig_line)
13019d41 65 goto err;
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66 sig_line++;
67
68 typelen = tag_line - type_line - strlen("type \n");
69 if (typelen >= 20)
13019d41 70 goto err;
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DB
71 taglen = sig_line - tag_line - strlen("tag \n");
72 item->tag = xmalloc(taglen + 1);
73 memcpy(item->tag, tag_line + 4, taglen);
74 item->tag[taglen] = '\0';
75
13019d41 76 free(data);
2636f614 77 return 0;
13019d41
SV
78
79err:
80 free(data);
81 return -1;
2636f614 82}