Introduce trivial new pager.c helper infrastructure

diff --git a/diffcore-pathspec.c b/diffcore-pathspec.c
index 68fe009132d1e900138a9d61bb7c658e23d9b76d..139fe882f9f85575af297a2131cfac2888ae3c73 100644 (file)
--- a/diffcore-pathspec.c
+++ b/diffcore-pathspec.c
@@ -48,6 +48,9 @@ void diffcore_pathspec(const char **pathspec)
        for (i = 0; pathspec[i]; i++)
                ;
        speccnt = i;
+       if (!speccnt)
+               return;
+
        spec = xmalloc(sizeof(*spec) * speccnt);
        for (i = 0; pathspec[i]; i++) {
                spec[i].spec = pathspec[i];