@itemize
@item
This function is missing on some platforms:
-AIX 4.3.2, HP-UX 11, IRIX 6.5, Solaris 9, mingw, BeOS.
+AIX 4.3.2, HP-UX 11.23, IRIX 6.5, Solaris 9, mingw, BeOS.
@item
On some platforms, this function does not fail with @samp{EINVAL} when
passed an empty string or a string containing @samp{=}: