traverse_trees(): clarify return value of the callback

The variable name "ret" sounds like the variable to be returned, but
since e6c111b4 we return error, and it is misleading.

As this variable tells us which trees in t[] array were used in the
callback function, so that this caller can know the entries in which
of the trees need advancing, "trees_used" is a better name.

Also the assignment to 0 was removed at the start of the function as
well after the "if (interesting)" block.  Those are unneeded as that
variable is set to the callback return value any time we enter the
"if (interesting)" block, so we'd overwrite old values anyway.

Signed-off-by: Stefan Beller <stefanbeller@googlemail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/tree-walk.c b/tree-walk.c
index 6e30ef9d048c62c11a92aa5b0ee6df2d227776e6..c626135234f2fbf2d8711e32a020d2e228a307b2 100644 (file)
--- a/tree-walk.c
+++ b/tree-walk.c
@@ -323,7 +323,6 @@ static inline int prune_traversal(struct name_entry *e,
 
 int traverse_trees(int n, struct tree_desc *t, struct traverse_info *info)
 {
-       int ret = 0;
        int error = 0;
        struct name_entry *entry = xmalloc(n*sizeof(*entry));
        int i;
@@ -341,6 +340,7 @@ int traverse_trees(int n, struct tree_desc *t, struct traverse_info *info)
                strbuf_setlen(&base, info->pathlen);
        }
        for (;;) {
+               int trees_used;
                unsigned long mask, dirmask;
                const char *first = NULL;
                int first_len = 0;
@@ -404,15 +404,14 @@ int traverse_trees(int n, struct tree_desc *t, struct traverse_info *info)
                if (interesting < 0)
                        break;
                if (interesting) {
-                       ret = info->fn(n, mask, dirmask, entry, info);
-                       if (ret < 0) {
-                               error = ret;
+                       trees_used = info->fn(n, mask, dirmask, entry, info);
+                       if (trees_used < 0) {
+                               error = trees_used;
                                if (!info->show_all_errors)
                                        break;
                        }
-                       mask &= ret;
+                       mask &= trees_used;
                }
-               ret = 0;
                for (i = 0; i < n; i++)
                        if (mask & (1ul << i))
                                update_extended_entry(tx + i, entry + i);