From 58f046ba26d67c6e1ceda2a20977e316f1a942ad Mon Sep 17 00:00:00 2001
From: KWSys Upstream <kwrobot@kitware.com>
Date: Fri, 8 Oct 2021 07:54:12 -0400
Subject: KWSys 2021-10-08 (b8c734ba)

Code extracted from:

    https://gitlab.kitware.com/utils/kwsys.git

at commit b8c734bac4380fae3758cd34dbcc8425532e4ecf (master).

Upstream Shortlog
-----------------

Laurent Malka (1):
      6ccbfc12 SystemTools: Add a Join function

Sean McBride (2):
      f9e45083 CTestConfig: Always set CTEST_DROP_METHOD to https
      15effd64 MD5: Fix Clang 13 Wnull-pointer-subtraction warning
---
 CTestConfig.cmake   |  4 +---
 MD5.c               |  3 ++-
 SystemTools.cxx     | 26 ++++++++++++++++++++++++++
 SystemTools.hxx.in  |  7 +++++++
 testSystemTools.cxx | 10 ++++++++++
 5 files changed, 46 insertions(+), 4 deletions(-)

diff --git a/CTestConfig.cmake b/CTestConfig.cmake
index 12347b6..6484cc2 100644
--- a/CTestConfig.cmake
+++ b/CTestConfig.cmake
@@ -3,9 +3,7 @@
 
 set(CTEST_PROJECT_NAME "KWSys")
 set(CTEST_NIGHTLY_START_TIME "21:00:00 EDT")
-if (NOT CTEST_DROP_METHOD STREQUAL "https")
-  set(CTEST_DROP_METHOD "http")
-endif ()
+set(CTEST_DROP_METHOD "https")
 set(CTEST_DROP_SITE "open.cdash.org")
 set(CTEST_DROP_LOCATION "/submit.php?project=PublicDashboard")
 set(CTEST_DROP_SITE_CDASH TRUE)
diff --git a/MD5.c b/MD5.c
index fb18a5b..76995e2 100644
--- a/MD5.c
+++ b/MD5.c
@@ -10,6 +10,7 @@
 #endif
 
 #include <stddef.h> /* size_t */
+#include <stdint.h> /* uintptr_t */
 #include <stdlib.h> /* malloc, free */
 #include <string.h> /* memcpy, strlen */
 
@@ -202,7 +203,7 @@ static void md5_process(md5_state_t* pms, const md5_byte_t* data /*[64]*/)
        * On little-endian machines, we can process properly aligned
        * data without copying it.
        */
-      if (!((data - (const md5_byte_t*)0) & 3)) {
+      if (!((uintptr_t)data & 3)) {
         /* data are properly aligned */
         X = (const md5_word_t*)data;
       } else {
diff --git a/SystemTools.cxx b/SystemTools.cxx
index 930d84c..bd900fe 100644
--- a/SystemTools.cxx
+++ b/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.
diff --git a/SystemTools.hxx.in b/SystemTools.hxx.in
index e5d115e..dd0cb3b 100644
--- a/SystemTools.hxx.in
+++ b/SystemTools.hxx.in
@@ -214,6 +214,13 @@ public:
                     char separator);
 
   /**
+   * Joins a vector of strings into a single string, with separator in between
+   * each string.
+   */
+  static std::string Join(const std::vector<std::string>& list,
+                          const std::string& separator);
+
+  /**
    * Return string with space added between capitalized words
    * (i.e. EatMyShorts becomes Eat My Shorts )
    * (note that IEatShorts becomes IEat Shorts)
diff --git a/testSystemTools.cxx b/testSystemTools.cxx
index 6ccc7a7..f96bd71 100644
--- a/testSystemTools.cxx
+++ b/testSystemTools.cxx
@@ -626,6 +626,16 @@ static bool CheckStringOperations()
     res = false;
   }
 
+  std::vector<std::string> linesToJoin = { "Mary", "Had", "A", "Little",
+                                           "Lamb." };
+  std::string joinResult = kwsys::SystemTools::Join(linesToJoin, " ");
+  if (joinResult != "Mary Had A Little Lamb.") {
+    std::cerr << "Problem with Join "
+                 "\"Mary Had A Little Lamb.\""
+              << std::endl;
+    res = false;
+  }
+
   if (kwsys::SystemTools::ConvertToWindowsOutputPath(
         "L://Local Mojo/Hex Power Pack/Iffy Voodoo") !=
       "\"L:\\Local Mojo\\Hex Power Pack\\Iffy Voodoo\"") {
-- 
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