Some changes to migrate towards C++ and a multithreaded model

path.h

@@ -25,36 +25,40 @@ wchar_t *path_get_config( void *context);
 
 /**
    Finds the full path of an executable in a newly allocated string.
-
+   
    \param cmd The name of the executable.
    \param context the halloc context to use for memory allocations
    \return 0 if the command can not be found, the path of the command otherwise.
 */
 wchar_t *path_get_path( void *context, const wchar_t *cmd );
 
+class env_vars;
+bool path_get_path_string(const wcstring &cmd, wcstring &output, const env_vars &vars);
+
 /**
    Returns the full path of the specified directory, using the CDPATH
    variable as a list of base directories for relative paths. The
    returned string is allocated using halloc and the specified
    context.
-
+   
    If no valid path is found, null is returned and errno is set to
    ENOTDIR if at least one such path was found, but it did not point
    to a directory, EROTTEN if a arotten symbolic link was found, or
    ENOENT if no file of the specified name was found. If both a rotten
    symlink and a file are found, it is undefined which error status
    will be returned.
-
+   
    \param in The name of the directory.
    \param context the halloc context to use for memory allocations
    \return 0 if the command can not be found, the path of the command otherwise.
 */
-wchar_t *path_get_cdpath( void *context, wchar_t *in );
+wchar_t *path_get_cdpath( void *context, const wchar_t *in );
+bool path_get_cdpath_string(const wcstring &in, wcstring &out, const env_vars &vars);
 
 /**
    Remove doulbe slashes and trailing slashes from a path,
    e.g. transform foo//bar/ into foo/bar.
-
+   
    The returned string is allocated using the specified halloc
    context.
  */