[PATCH] Implementations of parsing functions
[git/git.git] / tree.c
1 #include "tree.h"
2 #include "blob.h"
3 #include "cache.h"
4 #include <stdlib.h>
5
6 const char *tree_type = "tree";
7
8 struct tree *lookup_tree(unsigned char *sha1)
9 {
10 struct object *obj = lookup_object(sha1);
11 if (!obj) {
12 struct tree *ret = malloc(sizeof(struct tree));
13 memset(ret, 0, sizeof(struct tree));
14 created_object(sha1, &ret->object);
15 return ret;
16 }
17 if (obj->parsed && obj->type != tree_type) {
18 error("Object %s is a %s, not a tree",
19 sha1_to_hex(sha1), obj->type);
20 return NULL;
21 }
22 return (struct tree *) obj;
23 }
24
25 int parse_tree(struct tree *item)
26 {
27 char type[20];
28 void *buffer, *bufptr;
29 unsigned long size;
30 if (item->object.parsed)
31 return 0;
32 item->object.parsed = 1;
33 item->object.type = tree_type;
34 buffer = bufptr = read_sha1_file(item->object.sha1, type, &size);
35 if (!buffer)
36 return error("Could not read %s",
37 sha1_to_hex(item->object.sha1));
38 if (strcmp(type, tree_type))
39 return error("Object %s not a tree",
40 sha1_to_hex(item->object.sha1));
41 while (size) {
42 struct object *obj;
43 int len = 1+strlen(bufptr);
44 unsigned char *file_sha1 = bufptr + len;
45 char *path = strchr(bufptr, ' ');
46 unsigned int mode;
47 if (size < len + 20 || !path ||
48 sscanf(bufptr, "%o", &mode) != 1)
49 return -1;
50
51 /* Warn about trees that don't do the recursive thing.. */
52 if (strchr(path, '/')) {
53 item->has_full_path = 1;
54 }
55
56 bufptr += len + 20;
57 size -= len + 20;
58
59 if (S_ISDIR(mode)) {
60 obj = &lookup_tree(file_sha1)->object;
61 } else {
62 obj = &lookup_blob(file_sha1)->object;
63 }
64 add_ref(&item->object, obj);
65 }
66 return 0;
67 }