ENH: add convenience function to convert Windows command line args into Unix argc/argv. Pulled and cleaned from PV/VV/VJ init code

Source/kwsys/SystemTools.cxx

@@ -3138,6 +3138,109 @@ void SystemTools::Delay(unsigned int msec)
 #endif
 }
 
+void SystemTools::ConvertWindowsCommandLineToUnixArguments(
+  const char *cmd_line, int *argc, char ***argv)
+{
+  if (!cmd_line || !argc || !argv)
+    {
+    return;
+    }
+
+  // A space delimites an argument except when it is inside a quote
+
+  (*argc) = 1;
+
+  size_t cmd_line_len = strlen(cmd_line);
+
+  size_t i;
+  for (i = 0; i < cmd_line_len; i++)
+    {
+    while (isspace(cmd_line[i]) && i < cmd_line_len)
+      {
+      i++;
+      }
+    if (i < cmd_line_len)
+      {
+      if (cmd_line[i] == '\"')
+        {
+        i++;
+        while (cmd_line[i] != '\"' && i < cmd_line_len)
+          {
+          i++;
+          }
+        (*argc)++;
+        }
+      else
+        {
+        while (!isspace(cmd_line[i]) && i < cmd_line_len)
+          {
+          i++;
+          }
+        (*argc)++;
+        }
+      }
+    }
+
+  (*argv) = new char* [(*argc) + 1];
+  (*argv)[(*argc)] = NULL;
+
+  // Set the first arg to be the exec name
+
+  (*argv)[0] = new char [1024];
+#ifdef _WIN32
+  ::GetModuleFileName(0, (*argv)[0], 1024);
+#else
+  (*argv)[0][0] = '\0';
+#endif
+
+  // Allocate the others
+
+  int j;
+  for (j = 1; j < (*argc); j++)
+    {
+    (*argv)[j] = new char [cmd_line_len + 10];
+    }
+
+  // Grab the args
+
+  size_t pos = 0;
+  int argc_idx = 1;
+
+  for (i = 0; i < cmd_line_len; i++)
+    {
+    while (isspace(cmd_line[i]) && i < cmd_line_len)
+      {
+      i++;
+      }
+    if (i < cmd_line_len)
+      {
+      if (cmd_line[i] == '\"')
+        {
+        i++;
+        pos = i;
+        while (cmd_line[i] != '\"' && i < cmd_line_len)
+          {
+          i++;
+          }
+        memcpy((*argv)[argc_idx], &cmd_line[pos], i - pos);
+        (*argv)[argc_idx][i - pos] = '\0';
+        argc_idx++;
+        }
+      else
+        {
+        pos = i;
+        while (!isspace(cmd_line[i]) && i < cmd_line_len)
+          {
+          i++;
+          }
+        memcpy((*argv)[argc_idx], &cmd_line[pos], i - pos);
+        (*argv)[argc_idx][i - pos] = '\0';
+        argc_idx++;
+        }
+      }
+    }
+ }
+
 kwsys_stl::string SystemTools::GetOperatingSystemNameAndVersion()
 {
   kwsys_stl::string res;

Source/kwsys/SystemTools.hxx.in

@@ -410,6 +410,12 @@ public:
    */
   static bool IsSubDirectory(const char* fileOrDir, const char* dir);
 
+  /**
+   * Convert the path to a string that can be used in a unix makefile.
+   * double slashes are removed, and spaces are escaped.
+   */
+  static kwsys_stl::string ConvertToUnixOutputPath(const char*);
+
   /** -----------------------------------------------------------------
    *               File Manipulation Routines
    *  -----------------------------------------------------------------
@@ -655,11 +661,14 @@ public:
   static kwsys_stl::string GetOperatingSystemNameAndVersion();
 
   /**
-   * Convert the path to a string that can be used in a unix makefile.
-   * double slashes are removed, and spaces are escaped.
+   * Convert windows-style arguments given as a command-line string
+   * into more traditional argc/argv arguments.
+   * Note that argv[0] will be assigned the executable name using
+   * the ::GetModuleFileName function.
    */
-  static kwsys_stl::string ConvertToUnixOutputPath(const char*);
-
+  static void ConvertWindowsCommandLineToUnixArguments(
+    const char *cmd_line, int *argc, char ***argv);
+  
 protected:
   // these two functions can be called from ConvertToOutputPath