Add public rpmdsCurrent() function for creating a single ds from iteration

- Permits extracting single dependencies from a set with instance
  number inherited without exposing rpmdsSetInstance() kind of thing
- Also faster than calling rpmdsSingle(rpmdsTagN(ds), rpmdsN(ds)....)
  where each call re-re-re-re-validates the indexes

1 files changed, 10 insertions, 0 deletions

diff --git a/lib/rpmds.c b/lib/rpmds.c
index b3dd0f684..faf0ba585 100644
--- a/lib/rpmds.c
+++ b/lib/rpmds.c
@@ -252,6 +252,16 @@ rpmds rpmdsSingle(rpmTag tagN, const char * N, const char * EVR, rpmsenseFlags F
     return singleDS(tagN, N, EVR, Flags, 0);
 }
 
+rpmds rpmdsCurrent(rpmds ds)
+{
+    rpmds cds = NULL;
+    if (ds != NULL && ds->i >= 0 && ds->i < ds->Count) {
+	cds = singleDS(ds->tagN, ds->N[ds->i], ds->EVR[ds->i],
+		       ds->Flags[ds->i], ds->instance);
+    }
+    return cds;
+}
+
 int rpmdsCount(const rpmds ds)
 {
     return (ds != NULL ? ds->Count : 0);