VS2005 project call free() compiled with static libcurl library reported heap error

curl There are many places to use strdup, but windows The next has been abandoned “strdup”, And ask for “_strdup” replace （

https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/strdup-wcsdup?view=vs-2019）.

That's what makes libcurl Static library call free() The cause of the abnormality in the process .

    Actually libcurl The differences of memory allocation and release functions under different platforms have been considered , Library implementation malloc,calloc,strdup,free Such as function , What's actually called is easy.c As defined in Curl_cmalloc,Curl_ccalloc,Curl_cstrdup,Curl_cfree A function pointer , Initialization function global_init() Will define these function pointers .

/**
 * curl_global_init() globally initializes curl given a bitwise set of the
 * different features of what to initialize.
 */
static CURLcode global_init(long flags, bool memoryfuncs)
{
  if(initialized++)
    return CURLE_OK;

  if(memoryfuncs) {
    /* Setup the default memory functions here (again) */
    Curl_cmalloc = (curl_malloc_callback)malloc;
    Curl_cfree = (curl_free_callback)free;
    Curl_crealloc = (curl_realloc_callback)realloc;
    Curl_cstrdup = (curl_strdup_callback)system_strdup;
    Curl_ccalloc = (curl_calloc_callback)calloc;
#if defined(WIN32) && defined(UNICODE)
    Curl_cwcsdup = (curl_wcsdup_callback)_wcsdup;
#endif
  }

  if(!Curl_ssl_init()) {
    DEBUGF(fprintf(stderr, "Error: Curl_ssl_init failed\n"));
    goto fail;
  }

#ifdef WIN32
  if(Curl_win32_init(flags)) {
    DEBUGF(fprintf(stderr, "Error: win32_init failed\n"));
    goto fail;
  }
#endif

    among , Only Curl_cstrdup The default value of is special , It points to system_strdup . It can be seen that , Only in _WIN32_WCE Under defined conditions strdup Point to _strdup, Otherwise, call curlx_strdup or strdup , And because the config-win32.h In the definition of #define HAVE_STRDUP 1, So use VS Compilation will not use curlx_strdup, That's all strdup 了 .

  #if defined(_WIN32_WCE)
  #define system_strdup _strdup
  #elif !defined(HAVE_STRDUP)
  #define system_strdup curlx_strdup
  #else
  #define system_strdup strdup
  #endif

     We add here WIN32 Judge the condition , In this way visual studio Call down strdup Will point to the desired security function _strdup.

- #if defined(_WIN32_WCE)
+ #if defined(_WIN32_WCE) || defined(_WIN32) ||defined(WIN32)
  #define system_strdup _strdup
  #elif !defined(HAVE_STRDUP)
  #define system_strdup curlx_strdup
  #else
  #define system_strdup strdup
  #endif