builtin-clone: rewrite guess_dir_name()

The function has to do three small and independent tasks, but all of them
were crammed into a single loop. This rewrites the function entirely by
unrolling these tasks.

We also now use is_dir_sep(c) instead of c == '/' to increase portability.

Signed-off-by: Johannes Sixt <johannes.sixt@telecom.at>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin-clone.c b/builtin-clone.c
index 8112716c108e5d4d21fa9d3cf3300bfdb06afd20..352224591f3be1eaff858b1fe10dac8f852f32c2 100644 (file)
--- a/builtin-clone.c
+++ b/builtin-clone.c
@@ -95,35 +95,38 @@ static char *get_repo_path(const char *repo, int *is_bundle)
 
 static char *guess_dir_name(const char *repo, int is_bundle)
 {
-       const char *p, *start, *end, *limit;
-       int after_slash_or_colon;
-
-       /* Guess dir name from repository: strip trailing '/',
-        * strip trailing '[:/]*.{git,bundle}', strip leading '.*[/:]'. */
-
-       after_slash_or_colon = 1;
-       limit = repo + strlen(repo);
-       start = repo;
-       end = limit;
-       for (p = repo; p < limit; p++) {
-               const char *prefix = is_bundle ? ".bundle" : ".git";
-               if (!prefixcmp(p, prefix)) {
-                       if (!after_slash_or_colon)
-                               end = p;
-                       p += strlen(prefix) - 1;
-               } else if (!prefixcmp(p, ".bundle")) {
-                       if (!after_slash_or_colon)
-                               end = p;
-                       p += 7;
-               } else if (*p == '/' || *p == ':') {
-                       if (end == limit)
-                               end = p;
-                       after_slash_or_colon = 1;
-               } else if (after_slash_or_colon) {
-                       start = p;
-                       end = limit;
-                       after_slash_or_colon = 0;
-               }
+       const char *end = repo + strlen(repo), *start;
+
+       /*
+        * Strip trailing slashes and /.git
+        */
+       while (repo < end && is_dir_sep(end[-1]))
+               end--;
+       if (end - repo > 5 && is_dir_sep(end[-5]) &&
+           !strncmp(end - 4, ".git", 4)) {
+               end -= 5;
+               while (repo < end && is_dir_sep(end[-1]))
+                       end--;
+       }
+
+       /*
+        * Find last component, but be prepared that repo could have
+        * the form  "remote.example.com:foo.git", i.e. no slash
+        * in the directory part.
+        */
+       start = end;
+       while (repo < start && !is_dir_sep(start[-1]) && start[-1] != ':')
+               start--;
+
+       /*
+        * Strip .{bundle,git}.
+        */
+       if (is_bundle) {
+               if (end - start > 7 && !strncmp(end - 7, ".bundle", 7))
+                       end -= 7;
+       } else {
+               if (end - start > 4 && !strncmp(end - 4, ".git", 4))
+                       end -= 4;
        }
 
        return xstrndup(start, end - start);