From 46f933875e7b1c4b38437b758ac9a3f4007b8db1 Mon Sep 17 00:00:00 2001
From: gcxfd <i@rmw.link>
Date: Sat, 11 Dec 2021 20:31:08 +0800
Subject: [PATCH 1/2] add MDBX_SET_UPPERBOUND

---
 mdbx.h     |  7 ++++++-
 src/core.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 50 insertions(+), 1 deletion(-)

diff --git a/mdbx.h b/mdbx.h
index 4ec12c1ce..f30121bb6 100644
--- a/mdbx.h
+++ b/mdbx.h
@@ -1583,7 +1583,12 @@ enum MDBX_cursor_op {
    * i.e. for a pairs/tuples of a key and an each data value of duplicates.
    * Returns \ref MDBX_SUCCESS if key-value pair found exactly and
    * \ref MDBX_RESULT_TRUE if the next pair was returned. */
-  MDBX_SET_LOWERBOUND
+  MDBX_SET_LOWERBOUND,
+
+  /** Position at first key-value pair lesser than or equal to specified, 
+   * return same as MDBX_SET_LOWERBOUND 
+  */
+  MDBX_SET_UPPERBOUND
 };
 #ifndef __cplusplus
 /** \ingroup c_cursors */
diff --git a/src/core.c b/src/core.c
index d5bcff153..0de538a21 100644
--- a/src/core.c
+++ b/src/core.c
@@ -14542,6 +14542,50 @@ int mdbx_cursor_get(MDBX_cursor *mc, MDBX_val *key, MDBX_val *data,
       rc = MDBX_RESULT_TRUE;
     break;
   }
+  case MDBX_SET_UPPERBOUND: {
+    if (unlikely(key == NULL || data == NULL))
+      return MDBX_EINVAL;
+    MDBX_val save_data = *data;
+    struct cursor_set_result csr =
+        mdbx_cursor_set(mc, key, data, MDBX_SET_RANGE);
+    rc = csr.err;
+    if (rc == MDBX_NOTFOUND) {
+      rc = mdbx_cursor_last(mc, key, data);
+      if (rc == MDBX_SUCCESS) {
+        rc = MDBX_RESULT_TRUE;
+      }
+    } else if ( rc == MDBX_SUCCESS ){
+      if (csr.exact) {
+        if (mc->mc_xcursor) {
+          mc->mc_flags &= ~C_DEL;
+          csr.exact = false;
+          if (!save_data.iov_base && (mc->mc_db->md_flags & MDBX_DUPFIXED)) {
+            mfunc = mdbx_cursor_last;
+            goto mmove;
+          } else if (mc->mc_xcursor->mx_cursor.mc_flags & C_INITIALIZED) {
+            *data = save_data;
+            csr = mdbx_cursor_set(&mc->mc_xcursor->mx_cursor, data, NULL,
+                                  MDBX_SET_RANGE);
+            rc = csr.err;
+            if (rc == MDBX_NOTFOUND) {
+              mdbx_cassert(mc, !csr.exact);
+              rc = mdbx_cursor_prev(mc, key, data, MDBX_PREV_NODUP);
+            }
+          } else {
+            int cmp = mc->mc_dbx->md_dcmp(&save_data, data);
+            csr.exact = (cmp == 0);
+            if (cmp > 0)
+              rc = mdbx_cursor_prev(mc, key, data, MDBX_PREV_NODUP);
+          }
+      }
+    } else {
+      rc = mdbx_cursor_prev(mc, key, data, MDBX_PREV);
+    }
+    if (rc == MDBX_SUCCESS && !csr.exact)
+      rc = MDBX_RESULT_TRUE;
+  }
+   break;
+ }
   default:
     mdbx_debug("unhandled/unimplemented cursor operation %u", op);
     return MDBX_EINVAL;

From 74b62ceee5677a61fcad0be33ae105b5fd4495a3 Mon Sep 17 00:00:00 2001
From: gcxfd <i@rmw.link>
Date: Sat, 11 Dec 2021 20:32:18 +0800
Subject: [PATCH 2/2] .gitignore add *.err *.log

---
 .gitignore | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/.gitignore b/.gitignore
index 671b049c3..2c9daa332 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,6 @@
 *.[ao]
+*.err
+*.log
 *.bak
 *.exe
 *.gcda