t4201: make use of abbreviation in the test more robust

diff --git a/builtin/ls-files.c b/builtin/ls-files.c
index 1592290815c8b93701fa9d175d76f7a7ed85f7d2..1c0f057d02c55c8449bc9da1f1f01d509bbca8ba 100644 (file)
--- a/builtin/ls-files.c
+++ b/builtin/ls-files.c
@@ -369,28 +369,30 @@ static void show_files(struct dir_struct *dir)
 /*
  * Prune the index to only contain stuff starting with "prefix"
  */
-static void prune_cache(const char *prefix)
+static void prune_cache(const char *prefix, size_t prefixlen)
 {
-       int pos = cache_name_pos(prefix, max_prefix_len);
+       int pos;
        unsigned int first, last;
 
+       if (!prefix)
+               return;
+       pos = cache_name_pos(prefix, prefixlen);
        if (pos < 0)
                pos = -pos-1;
-       memmove(active_cache, active_cache + pos,
-               (active_nr - pos) * sizeof(struct cache_entry *));
-       active_nr -= pos;
-       first = 0;
+       first = pos;
        last = active_nr;
        while (last > first) {
                int next = (last + first) >> 1;
                const struct cache_entry *ce = active_cache[next];
-               if (!strncmp(ce->name, prefix, max_prefix_len)) {
+               if (!strncmp(ce->name, prefix, prefixlen)) {
                        first = next+1;
                        continue;
                }
                last = next;
        }
-       active_nr = last;
+       memmove(active_cache, active_cache + pos,
+               (last - pos) * sizeof(struct cache_entry *));
+       active_nr = last - pos;
 }
 
 /*
@@ -641,8 +643,7 @@ int cmd_ls_files(int argc, const char **argv, const char *cmd_prefix)
              show_killed || show_modified || show_resolve_undo))
                show_cached = 1;
 
-       if (max_prefix)
-               prune_cache(max_prefix);
+       prune_cache(max_prefix, max_prefix_len);
        if (with_tree) {
                /*
                 * Basic sanity check; show-stages and show-unmerged