DevPath.exe fails to set registry key when using a lot of driverpacks (Page 1 of 2)

#include <Windows.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <tchar.h>
#include <strsafe.h>

#pragma comment(lib, "AdvAPI32.Lib")


//------------------------------------------------------------------------------------------------------------------
// Globals...
//------------------------------------------------------------------------------------------------------------------
WIN32_FIND_DATA *fd;

#define DEVPATH_REGISTRY_VALUE_BUFFER 100000
#define DEVPATH_REGISTRY_KEY   "SOFTWARE\\Microsoft\\Windows\\CurrentVersion"
#define DEVPATH_REGISTRY_VALUE "DevicePath"

//------------------------------------------------------------------------------------------------------------------
// Protos...
//------------------------------------------------------------------------------------------------------------------
int     navigatepath(const char *path, char *registryvalue, BOOL recursive);
int     fixpath(const char *inpath, char *outpath);

//------------------------------------------------------------------------------------------------------------------
// navigatepath()
//------------------------------------------------------------------------------------------------------------------
int navigatepath(const char *_path, char *registryvalue, BOOL recursive)
{
  HANDLE fh;
  int    filecnt=0;
  int    filenamelen;
  char	 path[MAX_PATH];
  char	 tmppath[MAX_PATH];

  fd = malloc(sizeof(WIN32_FIND_DATA));

  fixpath(_path,path);
  strcat_s(path,MAX_PATH,"*");

  fh = FindFirstFile((LPCSTR) path,fd);

  if (fh != INVALID_HANDLE_VALUE)
  {
    do
    {
      if (!(fd->dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY))
      {
        filenamelen = strlen( fd->cFileName );

        if (filenamelen >= 4)
        {
          if (fd->cFileName[filenamelen - 4] == '.' && (fd->cFileName[filenamelen - 3] == 'I' || fd->cFileName[filenamelen - 3] == 'i') && (fd->cFileName[filenamelen - 2] == 'N' || fd->cFileName[filenamelen - 2] == 'n') && (fd->cFileName[filenamelen - 1] == 'F' || fd->cFileName[filenamelen - 1] == 'f'))
          {
            filecnt++;
            break;
          }
        }
        
      }
    }
    while(FindNextFile(fh,fd));
  }

  if (filecnt)
  {
    strcat_s(registryvalue,DEVPATH_REGISTRY_VALUE_BUFFER,";");
    strcat_s(registryvalue,DEVPATH_REGISTRY_VALUE_BUFFER,_path);
  }

  fh = FindFirstFile((LPCSTR) path,fd);

  if (fh != INVALID_HANDLE_VALUE)
  {
    do
    {
      if (fd->dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
      {
        if((0 != strcmp(fd->cFileName,".")) && (0 != strcmp(fd->cFileName,"..")))
        {
          fixpath(_path,tmppath);
          strcat_s(tmppath,MAX_PATH,fd->cFileName);

          if(recursive)
            navigatepath(tmppath, registryvalue, recursive);
        }
      }
    }
    while(FindNextFile(fh,fd));
  }

  
  FindClose(fh);

  return 0;
}

//------------------------------------------------------------------------------------------------------------------
// fixpath() - Adds \ to the end of a path if not present.
//------------------------------------------------------------------------------------------------------------------
int fixpath(const char *inpath, char *outpath)
{
  int   n=0;

  strcpy_s(outpath,MAX_PATH,inpath);

  while(inpath[n]) n++;

  if(inpath[n-1] != '\\')
  {
    strcat_s(outpath,MAX_PATH,"\\");
    return 1;
  }

  return 0;
}

//------------------------------------------------------------------------------------------------------------------
// Entry point...
//------------------------------------------------------------------------------------------------------------------

int main(int argc, char *argv[])
{
  int   recursive=1;
  char  registryvalue[DEVPATH_REGISTRY_VALUE_BUFFER];
  DWORD dwCategoryNum = 1;
  HKEY  hk;
  DWORD dwDisp;

  registryvalue[0] = 0;
  strcpy_s(registryvalue, DEVPATH_REGISTRY_VALUE_BUFFER, "%SystemRoot%\\Inf");

  if (argc == 1)
  {
    printf("Devpath.exe [drive:][path]\n\n");
    printf("DevPath.exe will scan [drive:][path] and all subfolders for the existence\n");
    printf("of *.inf file(s). It will set the registry key to the list of subfolders\n");
    printf("that contain *.inf file(s).\n");
    printf("HKLM %s REG_EXPAND_SZ %s\n",DEVPATH_REGISTRY_KEY,DEVPATH_REGISTRY_VALUE);
  }
  
  if (argc == 2)
  {
    navigatepath(argv[1], registryvalue, recursive);
  
    //printf("%s\n",registryvalue);
    //printf("string lenght of registryvalue = %d\n",strlen(registryvalue) );

    if ( RegCreateKeyEx( HKEY_LOCAL_MACHINE, TEXT(DEVPATH_REGISTRY_KEY), 0, NULL, 0, KEY_ALL_ACCESS, NULL, &hk, &dwDisp))
    {
      printf("Could not create the registry key\n");
      return 0;
    }

    if ( RegSetValueEx( hk, TEXT(DEVPATH_REGISTRY_VALUE), 0, REG_EXPAND_SZ, (LPBYTE) registryvalue, (DWORD) (lstrlen(registryvalue)+1)*sizeof(TCHAR)))
    {
      printf("Could not set the registry value for \"DevicePath\"\n");
    }
  }
  
  return 0;
}