Add a string equality check function to string pool API

- As a special case, two strings (ids) from the same pool can be tested for
  equality in constant time (integer comparison). If the pools differ,
  a regular string comparison is needed.

1 files changed, 9 insertions, 0 deletions

diff --git a/rpmio/rpmstrpool.c b/rpmio/rpmstrpool.c
index 55fc0e0bd..799136b01 100644
--- a/rpmio/rpmstrpool.c
+++ b/rpmio/rpmstrpool.c
@@ -173,3 +173,12 @@ size_t rpmstrPoolStrlen(rpmstrPool pool, rpmsid sid)
     }
     return slen;
 }
+
+int rpmstrPoolStreq(rpmstrPool poolA, rpmsid sidA,
+		    rpmstrPool poolB, rpmsid sidB)
+{
+    if (poolA == poolB)
+	return (sidA == sidB);
+    else
+	return rstreq(rpmstrPoolStr(poolA, sidA), rpmstrPoolStr(poolB, sidB));
+}