1 files changed, 16 insertions, 0 deletions
diff --git a/src/nvim/eval/typval.c b/src/nvim/eval/typval.c
index 0a30cdb62e..476faafb77 100644
--- a/src/nvim/eval/typval.c
+++ b/src/nvim/eval/typval.c
@@ -2710,6 +2710,22 @@ bool tv_blob_equal(const blob_T *const b1, const blob_T *const b2)
   return true;
 }
 
+/// Set bytes "n1" to "n2" (inclusive) in "dest" to the value of "src".
+/// Caller must make sure "src" is a blob.
+/// Returns FAIL if the number of bytes does not match.
+int tv_blob_set_range(blob_T *dest, long n1, long n2, typval_T *src)
+{
+  if (n2 - n1 + 1 != tv_blob_len(src->vval.v_blob)) {
+    emsg(_("E972: Blob value does not have the right number of bytes"));
+    return FAIL;
+  }
+
+  for (int il = (int)n1, ir = 0; il <= (int)n2; il++) {
+    tv_blob_set(dest, il, tv_blob_get(src->vval.v_blob, ir++));
+  }
+  return OK;
+}
+
 /// "remove({blob})" function
 void tv_blob_remove(typval_T *argvars, typval_T *rettv, const char *arg_errmsg)
 {