cache-tree: implement cache_tree_find_path()

Given a 'struct cache_tree', it may be beneficial to navigate directly
to a node within that corresponds to a given path name. Create
cache_tree_find_path() for this function. It returns NULL when no such
path exists.

The implementation is adapted from do_invalidate_path() which does a
similar search but also modifies the nodes it finds along the way. The
method could be implemented simply using tail-recursion, but this while
loop does the same thing.

This new method is not currently used, but will be in an upcoming
change.

Helped-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Derrick Stolee <derrickstolee@github.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
pull/1274/head
Derrick Stolee 4 months ago committed by Junio C Hamano
parent 9fadb373dd
commit 080ab56a46
  1. 27
      cache-tree.c
  2. 2
      cache-tree.h

@ -100,6 +100,33 @@ struct cache_tree_sub *cache_tree_sub(struct cache_tree *it, const char *path)
return find_subtree(it, path, pathlen, 1);
}
struct cache_tree *cache_tree_find_path(struct cache_tree *it, const char *path)
{
const char *slash;
int namelen;
struct cache_tree_sub it_sub = {
.cache_tree = it,
};
struct cache_tree_sub *down = &it_sub;
while (down) {
slash = strchrnul(path, '/');
namelen = slash - path;
down->cache_tree->entry_count = -1;
if (!*slash) {
int pos;
pos = cache_tree_subtree_pos(down->cache_tree, path, namelen);
if (0 <= pos)
return down->cache_tree->down[pos]->cache_tree;
return NULL;
}
down = find_subtree(it, path, namelen, 0);
path = slash + 1;
}
return NULL;
}
static int do_invalidate_path(struct cache_tree *it, const char *path)
{
/* a/b/c

@ -29,6 +29,8 @@ struct cache_tree_sub *cache_tree_sub(struct cache_tree *, const char *);
int cache_tree_subtree_pos(struct cache_tree *it, const char *path, int pathlen);
struct cache_tree *cache_tree_find_path(struct cache_tree *it, const char *path);
void cache_tree_write(struct strbuf *, struct cache_tree *root);
struct cache_tree *cache_tree_read(const char *buffer, unsigned long size);

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