Fix problem in strdup replacement when dealing with absolutely huge strings.

                                  Changelog

Yang Tse (6 Feb 2008)

- Fix an issue in strdup replacement function when dealing with absolutely

  huge strings. Only systems without a standard strdup would be affected.

Daniel S (3 Feb 2008)

- Dmitry Kurochkin cleaned up the pipelining code and removed the need for and

  use of the "is_in_pipeline" struct field.

This release includes the following bugfixes:

 o improved pipelining

 o improved strdup replacement

This release includes the following known bugs:

 *                            | (__| |_| |  _ <| |___

 *                             \___|\___/|_| \_\_____|

 *

 * Copyright (C) 1998 - 2007, Daniel Stenberg, <daniel@haxx.se>, et al.

 * Copyright (C) 1998 - 2008, Daniel Stenberg, <daniel@haxx.se>, et al.

 *

 * This software is licensed as described in the file COPYING, which

 * you should have received as part of this distribution. The terms

#ifndef HAVE_STRDUP

char *curlx_strdup(const char *str)

{

  int len;

  size_t len;

  char *newstr;

  if(!str)

    return (char *)NULL;

  len = strlen(str);

  if(len >= ((size_t)-1) / sizeof(char))

    return (char *)NULL;

  newstr = (char *) malloc((len+1)*sizeof(char));

  if(!newstr)

    return (char *)NULL;