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 <sunsh...@sunshineco.com>
---
cache.h | 4 ++++
name-hash.c | 54 ++++++++++++++++++++++++++++++------------------------
2 files changed, 34 insertions(+), 24 deletions(-)
diff --git a/cache.h b/cache.h
index a47b9c0..038afe1 100644
--- a/cache.h
+++ b/cache.h
@@ -314,6 +314,8 @@ extern void free_name_hash(struct index_state *istate);
#define refresh_cache(flags) refresh_index(&the_index, (flags), NULL, NULL,
NULL)
#define ce_match_stat(ce, st, options) ie_match_stat(&the_index, (ce), (st),
(options))
#define ce_modified(ce, st, options) ie_modified(&the_index, (ce), (st),
(options))
+#define cache_dir_exists(name, namelen) index_dir_exists(&the_index, (name),
(namelen))
+#define cache_file_exists(name, namelen, igncase)
index_file_exists(&the_index, (name), (namelen), (igncase))
#define cache_name_exists(name, namelen, igncase)
index_name_exists(&the_index, (name), (namelen), (igncase))
#define cache_name_is_other(name, namelen) index_name_is_other(&the_index,
(name), (namelen))
#define resolve_undo_clear() resolve_undo_clear_index(&the_index)
@@ -463,6 +465,8 @@ extern int write_index(struct index_state *, int newfd);
extern int discard_index(struct index_state *);
extern int unmerged_index(const struct index_state *);
extern int verify_path(const char *path);
+extern struct cache_entry *index_dir_exists(struct index_state *istate, const
char *name, int namelen);
+extern struct cache_entry *index_file_exists(struct index_state *istate, const
char *name, int namelen, int igncase);
extern struct cache_entry *index_name_exists(struct index_state *istate, const
char *name, int namelen, int igncase);
extern int index_name_pos(const struct index_state *, const char *name, int
namelen);
#define ADD_CACHE_OK_TO_ADD 1 /* Ok to add */
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;
--
1.8.4.535.g7b94f8e
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