Merge branch 'upstream-KWSys' into update-kwsys

# By KWSys Upstream
* upstream-KWSys:
  KWSys 2021-10-08 (b8c734ba)

1 files changed, 26 insertions, 0 deletions

diff --git a/Source/kwsys/SystemTools.cxx b/Source/kwsys/SystemTools.cxx
index 930d84c..bd900fe 100644
--- a/Source/kwsys/SystemTools.cxx
+++ b/Source/kwsys/SystemTools.cxx
@@ -3767,6 +3767,32 @@ bool SystemTools::Split(const std::string& str,
   return true;
 }
 
+std::string SystemTools::Join(const std::vector<std::string>& list,
+                              const std::string& separator)
+{
+  std::string result;
+  if (list.empty()) {
+    return result;
+  }
+
+  size_t total_size = separator.size() * (list.size() - 1);
+  for (const std::string& string : list) {
+    total_size += string.size();
+  }
+
+  result.reserve(total_size);
+  bool needs_separator = false;
+  for (const std::string& string : list) {
+    if (needs_separator) {
+      result += separator;
+    }
+    result += string;
+    needs_separator = true;
+  }
+
+  return result;
+}
+
 /**
  * Return path of a full filename (no trailing slashes).
  * Warning: returned path is converted to Unix slashes format.