Convert git_path_walk_up to regular function

This gets rid of the crazy macro version of git_path_walk_up
and makes it into a normal function that takes a callback
parameter.  This turned out not to be too messy.

1 files changed, 42 insertions, 0 deletions

diff --git a/src/path.c b/src/path.c
index f9663b7e5..4888123bf 100644
--- a/src/path.c
+++ b/src/path.c
@@ -305,3 +305,45 @@ int git_path_fromurl(git_buf *local_path_out, const char *file_url)
 
 	return error;
 }
+
+int git_path_walk_up(
+	git_buf *path,
+	const char *ceiling,
+	int (*cb)(void *data, git_buf *),
+	void *data)
+{
+	int error = GIT_SUCCESS;
+	git_buf iter;
+	ssize_t stop = 0, scan;
+	char oldc = '\0';
+
+	assert(path && cb);
+
+	if (ceiling != NULL) {
+		if (git__prefixcmp(path->ptr, ceiling) == GIT_SUCCESS)
+			stop = (ssize_t)strlen(ceiling);
+		else
+			stop = path->size;
+	}
+	scan = path->size;
+
+	iter.ptr = path->ptr;
+	iter.size = path->size;
+
+	while (scan >= stop) {
+		if ((error = cb(data, &iter)) < GIT_SUCCESS)
+			break;
+		iter.ptr[scan] = oldc;
+		scan = git_buf_rfind_next(&iter, '/');
+		if (scan >= 0) {
+			scan++;
+			oldc = iter.ptr[scan];
+			iter.size = scan;
+			iter.ptr[scan] = '\0';
+		}
+	}
+
+	iter.ptr[scan] = oldc;
+
+	return error;
+}