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authorEric Sunshine <sunshine@sunshineco.com>2013-09-17 07:06:14 (GMT)
committerJunio C Hamano <gitster@pobox.com>2013-09-17 17:07:13 (GMT)
commitdb5360f3f4966c4586d072bd1440880773185b81 (patch)
tree2df90653f56aecf73f7c644e543888e872eb5da8 /name-hash.c
parentb3e7d24ca19d841eb2c5c7fce7919ebb5d370a6f (diff)
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name-hash: refactor polymorphic index_name_exists()
Depending upon the absence or presence of a trailing '/' on the incoming pathname, index_name_exists() checks either if a file is present in the index or if a directory is represented within the index. Each caller explicitly chooses the mode of operation by adding or removing a trailing '/' before invoking index_name_exists(). Since these two modes of operations are disjoint and have no code in common (one searches index_state.name_hash; the other dir_hash), they can be represented more naturally as distinct functions: one to search for a file, and one for a directory. Splitting index searching into two functions relieves callers of the artificial burden of having to add or remove a slash to select the mode of operation; instead they just call the desired function. A subsequent patch will take advantage of this benefit in order to eliminate the requirement that the incoming pathname for a directory search must have a trailing slash. (In order to avoid disturbing in-flight topics, index_name_exists() is retained as a thin wrapper dispatching either to index_dir_exists() or index_file_exists().) Signed-off-by: Eric Sunshine <sunshine@sunshineco.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'name-hash.c')
-rw-r--r--name-hash.c54
1 files changed, 30 insertions, 24 deletions
diff --git a/name-hash.c b/name-hash.c
index 617c86c..f06b049 100644
--- a/name-hash.c
+++ b/name-hash.c
@@ -222,7 +222,29 @@ static int same_name(const struct cache_entry *ce, const char *name, int namelen
return slow_same_name(name, namelen, ce->name, len);
}
-struct cache_entry *index_name_exists(struct index_state *istate, const char *name, int namelen, int icase)
+struct cache_entry *index_dir_exists(struct index_state *istate, const char *name, int namelen)
+{
+ struct cache_entry *ce;
+ struct dir_entry *dir;
+
+ lazy_init_name_hash(istate);
+ dir = find_dir_entry(istate, name, namelen);
+ if (dir && dir->nr)
+ return dir->ce;
+
+ /*
+ * It might be a submodule. Unlike plain directories, which are stored
+ * in the dir-hash, submodules are stored in the name-hash, so check
+ * there, as well.
+ */
+ ce = index_file_exists(istate, name, namelen - 1, 1);
+ if (ce && S_ISGITLINK(ce->ce_mode))
+ return ce;
+
+ return NULL;
+}
+
+struct cache_entry *index_file_exists(struct index_state *istate, const char *name, int namelen, int icase)
{
unsigned int hash = hash_name(name, namelen);
struct cache_entry *ce;
@@ -237,32 +259,16 @@ struct cache_entry *index_name_exists(struct index_state *istate, const char *na
}
ce = ce->next;
}
-
- /*
- * When looking for a directory (trailing '/'), it might be a
- * submodule or a directory. Despite submodules being directories,
- * they are stored in the name hash without a closing slash.
- * When ignore_case is 1, directories are stored in a separate hash
- * table *with* their closing slash.
- *
- * The side effect of this storage technique is we have need to
- * lookup the directory in a separate hash table, and if not found
- * remove the slash from name and perform the lookup again without
- * the slash. If a match is made, S_ISGITLINK(ce->mode) will be
- * true.
- */
- if (icase && name[namelen - 1] == '/') {
- struct dir_entry *dir = find_dir_entry(istate, name, namelen);
- if (dir && dir->nr)
- return dir->ce;
-
- ce = index_name_exists(istate, name, namelen - 1, icase);
- if (ce && S_ISGITLINK(ce->ce_mode))
- return ce;
- }
return NULL;
}
+struct cache_entry *index_name_exists(struct index_state *istate, const char *name, int namelen, int icase)
+{
+ if (namelen > 0 && name[namelen - 1] == '/')
+ return index_dir_exists(istate, name, namelen);
+ return index_file_exists(istate, name, namelen, icase);
+}
+
static int free_dir_entry(void *entry, void *unused)
{
struct dir_entry *dir = entry;