get_tree_entry(): do not call find_tree_entry() on an empty tree

[thirdparty/git.git] / tree-walk.c

diff --git a/tree-walk.c b/tree-walk.c
index 418107ec83728473093b43dfe74ab709f312e8a8..cc2f14a0d6fd3a115ab453b4f28823400550cf60 100644 (file)
--- a/tree-walk.c
+++ b/tree-walk.c
@@ -116,7 +116,7 @@ void setup_traverse_info(struct traverse_info *info, const char *base)
 
 char *make_traverse_path(char *path, const struct traverse_info *info, const struct name_entry *n)
 {
-       int len = tree_entry_len(n->path, n->sha1);
+       int len = tree_entry_len(n);
        int pathlen = info->pathlen;
 
        path[pathlen + len] = 0;
@@ -126,7 +126,7 @@ char *make_traverse_path(char *path, const struct traverse_info *info, const str
                        break;
                path[--pathlen] = '/';
                n = &info->name;
-               len = tree_entry_len(n->path, n->sha1);
+               len = tree_entry_len(n);
                info = info->prev;
                pathlen -= len;
        }
@@ -253,7 +253,7 @@ static void extended_entry_extract(struct tree_desc_x *t,
         * The caller wants "first" from this tree, or nothing.
         */
        path = a->path;
-       len = tree_entry_len(a->path, a->sha1);
+       len = tree_entry_len(a);
        switch (check_entry_match(first, first_len, path, len)) {
        case -1:
                entry_clear(a);
@@ -271,7 +271,7 @@ static void extended_entry_extract(struct tree_desc_x *t,
        while (probe.size) {
                entry_extract(&probe, a);
                path = a->path;
-               len = tree_entry_len(a->path, a->sha1);
+               len = tree_entry_len(a);
                switch (check_entry_match(first, first_len, path, len)) {
                case -1:
                        entry_clear(a);
@@ -362,7 +362,7 @@ int traverse_trees(int n, struct tree_desc *t, struct traverse_info *info)
                        e = entry + i;
                        if (!e->path)
                                continue;
-                       len = tree_entry_len(e->path, e->sha1);
+                       len = tree_entry_len(e);
                        if (!first) {
                                first = e->path;
                                first_len = len;
@@ -381,7 +381,7 @@ int traverse_trees(int n, struct tree_desc *t, struct traverse_info *info)
                                /* Cull the ones that are not the earliest */
                                if (!e->path)
                                        continue;
-                               len = tree_entry_len(e->path, e->sha1);
+                               len = tree_entry_len(e);
                                if (name_compare(e->path, len, first, first_len))
                                        entry_clear(e);
                        }
@@ -434,8 +434,8 @@ static int find_tree_entry(struct tree_desc *t, const char *name, unsigned char
                int entrylen, cmp;
 
                sha1 = tree_entry_extract(t, &entry, mode);
+               entrylen = tree_entry_len(&t->entry);
                update_tree_entry(t);
-               entrylen = tree_entry_len(entry, sha1);
                if (entrylen > namelen)
                        continue;
                cmp = memcmp(name, entry, entrylen);
@@ -465,7 +465,6 @@ int get_tree_entry(const unsigned char *tree_sha1, const char *name, unsigned ch
        int retval;
        void *tree;
        unsigned long size;
-       struct tree_desc t;
        unsigned char root[20];
 
        tree = read_object_with_reference(tree_sha1, tree_type, &size, root);
@@ -478,8 +477,13 @@ int get_tree_entry(const unsigned char *tree_sha1, const char *name, unsigned ch
                return 0;
        }
 
-       init_tree_desc(&t, tree, size);
-       retval = find_tree_entry(&t, name, sha1, mode);
+       if (!size) {
+               retval = -1;
+       } else {
+               struct tree_desc t;
+               init_tree_desc(&t, tree, size);
+               retval = find_tree_entry(&t, name, sha1, mode);
+       }
        free(tree);
        return retval;
 }
@@ -596,7 +600,7 @@ int tree_entry_interesting(const struct name_entry *entry,
                                      ps->max_depth);
        }
 
-       pathlen = tree_entry_len(entry->path, entry->sha1);
+       pathlen = tree_entry_len(entry);
 
        for (i = ps->nr - 1; i >= 0; i--) {
                const struct pathspec_item *item = ps->items+i;