clone: use computed length in guess_dir_name

Commit 7e837c64 (clone: simplify string handling in
guess_dir_name(), 2015-07-09) changed clone to use
strip_suffix instead of hand-rolled pointer manipulation.
However, strip_suffix will strip from the end of a
NUL-terminated string, and we may have already stripped some
characters (like directory separators, or "/.git"). This
leads to commands like:

  git clone host:foo.git/

failing to strip the ".git".

We must instead convert our pointer arithmetic into a
computed length and feed that to strip_suffix_mem, which will
then reduce the length further for us.

It would be nicer if we could drop the pointer manipulation
entirely, and just continually strip using strip_suffix. But
that doesn't quite work for two reasons:

  1. The early suffixes we're stripping are not constant; we
     need to look for is_dir_sep, which could be one of
     several characters.

  2. Mid-way through the stripping we compute the pointer
     "start", which shows us the beginning of the pathname.
     Which really give us two lengths to work with: the
     offset from the start of the string, and from the start
     of the path. By using pointers for the early part, we
     can just compute the length from "start" when we need
     it.
Signed-off-by: NJeff King <peff@peff.net>
Acked-by: NSebastian Schuberth <sschuberth@gmail.com>
Signed-off-by: NPatrick Steinhardt <ps@pks.im>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

builtin/clone.c

@@ -174,7 +174,8 @@ static char *guess_dir_name(const char *repo, int is_bundle, int is_bare)
 	/*
 	 * Strip .{bundle,git}.
 	 */
-	strip_suffix(start, is_bundle ? ".bundle" : ".git" , &len);
+	len = end - start;
+	strip_suffix_mem(start, &len, is_bundle ? ".bundle" : ".git");
 
 	if (is_bare)
 		dir = xstrfmt("%.*s.git", (int)len, start);

t/t5603-clone-dirname.sh

@@ -47,7 +47,7 @@ test_clone_dir host:foo foo.git bare
 test_clone_dir host:foo.git foo
 test_clone_dir host:foo.git foo.git bare
 test_clone_dir host:foo/.git foo
-test_clone_dir host:foo/.git foo.git bare fail
+test_clone_dir host:foo/.git foo.git bare
 
 # similar, but using ssh URL rather than host:path syntax
 test_clone_dir ssh://host/foo foo
@@ -55,22 +55,22 @@ test_clone_dir ssh://host/foo foo.git bare
 test_clone_dir ssh://host/foo.git foo
 test_clone_dir ssh://host/foo.git foo.git bare
 test_clone_dir ssh://host/foo/.git foo
-test_clone_dir ssh://host/foo/.git foo.git bare fail
+test_clone_dir ssh://host/foo/.git foo.git bare
 
 # we should remove trailing slashes and .git suffixes
 test_clone_dir ssh://host/foo/ foo
 test_clone_dir ssh://host/foo/// foo
 test_clone_dir ssh://host/foo/.git/ foo
-test_clone_dir ssh://host/foo.git/ foo fail
-test_clone_dir ssh://host/foo.git/// foo fail
+test_clone_dir ssh://host/foo.git/ foo
+test_clone_dir ssh://host/foo.git/// foo
 test_clone_dir ssh://host/foo///.git/ foo
 test_clone_dir ssh://host/foo/.git/// foo
 
 test_clone_dir host:foo/ foo
 test_clone_dir host:foo/// foo
-test_clone_dir host:foo.git/ foo fail
+test_clone_dir host:foo.git/ foo
 test_clone_dir host:foo/.git/ foo
-test_clone_dir host:foo.git/// foo fail
+test_clone_dir host:foo.git/// foo
 test_clone_dir host:foo///.git/ foo
 test_clone_dir host:foo/.git/// foo