#define PETSC_DLL
/*
   Low-level routines for managing dynamic link libraries (DLLs).
*/

#include "../src/sys/dll/dlimpl.h"

/* XXX Should be done better !!!*/
#if !defined(PETSC_HAVE_DYNAMIC_LIBRARIES)
#undef PETSC_HAVE_WINDOWS_H
#undef PETSC_HAVE_DLFCN_H
#endif

#if defined(PETSC_HAVE_WINDOWS_H)
#include <windows.h>
#elif defined(PETSC_HAVE_DLFCN_H)
#include <dlfcn.h>
#endif

#if defined(PETSC_HAVE_WINDOWS_H)
typedef HMODULE dlhandle_t;
typedef FARPROC dlsymbol_t;
#elif defined(PETSC_HAVE_DLFCN_H)
typedef void* dlhandle_t;
typedef void* dlsymbol_t;
#else
typedef void* dlhandle_t;
typedef void* dlsymbol_t;
#endif

#undef __FUNCT__  
#define __FUNCT__ "PetscDLOpen"
/*@C
   PetscDLOpen - 
@*/
PetscErrorCode PETSC_DLLEXPORT PetscDLOpen(const char name[],int flags,PetscDLHandle *handle)
{
  int        dlflags1,dlflags2;
  dlhandle_t dlhandle;

  PetscFunctionBegin;
  PetscValidCharPointer(name,1);
  PetscValidPointer(handle,3);

  dlflags1 = 0;
  dlflags2 = 0;
  dlhandle = (dlhandle_t) 0;
  *handle  = (PetscDLHandle) 0;

  /* 
     --- LoadLibrary ---
  */  
#if defined(PETSC_HAVE_WINDOWS_H) && defined(PETSC_HAVE_LOADLIBRARY)
  dlhandle = LoadLibrary(name);
  if (!dlhandle) {
#if defined(PETSC_HAVE_GETLASTERROR)
    PetscErrorCode ierr;
    DWORD erc;
    char  *buff = NULL;
    erc = GetLastError();
    FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_IGNORE_INSERTS,
		  NULL,erc,MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),(LPSTR)&buff,0,NULL);
    ierr = PetscError(__LINE__,__FUNCT__,__FILE__,__SDIR__,PETSC_ERR_FILE_OPEN,1,
		      "Unable to open dynamic library:\n  %s\n  Error message from LoadLibrary() %s\n",name,buff);
    LocalFree(buff);
    PetscFunctionReturn(ierr);
#else
    SETERRQ2(PETSC_ERR_FILE_OPEN,"Unable to open dynamic library:\n  %s\n  Error message from LoadLibrary() %s\n",name,"unavailable");
#endif
  }

  /* 
     --- dlopen ---
  */  
#elif defined(PETSC_HAVE_DLFCN_H) && defined(PETSC_HAVE_DLOPEN)
  /*
      Mode indicates symbols required by symbol loaded with dlsym() 
     are only loaded when required (not all together) also indicates
     symbols required can be contained in other libraries also opened
     with dlopen()
  */
#if defined(PETSC_HAVE_RTLD_LAZY)
  dlflags1 = RTLD_LAZY;
#endif
#if defined(PETSC_HAVE_RTLD_NOW)
  if (flags & PETSC_DL_NOW)
    dlflags1 = RTLD_NOW;
#endif
#if defined(PETSC_HAVE_RTLD_GLOBAL)
  dlflags2 = RTLD_GLOBAL;
#endif
#if defined(PETSC_HAVE_RTLD_LOCAL)
  if (flags & PETSC_DL_LOCAL)
    dlflags2 = RTLD_LOCAL;
#endif
#if defined(PETSC_HAVE_DLERROR)
  dlerror(); /* clear any previous error */
#endif
  dlhandle = dlopen(name,dlflags1|dlflags2);
  if (!dlhandle) {
#if defined(PETSC_HAVE_DLERROR)
    const char *errmsg = dlerror();
#else
    const char *errmsg = "unavailable";
#endif
    SETERRQ2(PETSC_ERR_FILE_OPEN,"Unable to open dynamic library:\n  %s\n  Error message from dlopen() %s\n",name,errmsg)
  }

  /* 
     --- unimplemented ---
  */  
#else
  SETERRQ(PETSC_ERR_SUP_SYS, "Cannot use dynamic libraries on this platform");
#endif

  *handle = (PetscDLHandle) dlhandle;

  PetscFunctionReturn(0);
}


#undef __FUNCT__  
#define __FUNCT__ "PetscDLClose"
/*@C
   PetscDLClose - 
@*/
PetscErrorCode PETSC_DLLEXPORT PetscDLClose(PetscDLHandle *handle)
{
  dlhandle_t dlhandle;

  PetscFunctionBegin;
  PetscValidPointer(handle,1);

  dlhandle = (dlhandle_t) *handle;

  /* 
     --- FreeLibrary ---
  */  
#if defined(PETSC_HAVE_WINDOWS_H)
#if defined(PETSC_HAVE_FREELIBRARY)
  if (FreeLibrary(dlhandle) == 0) {
#if defined(PETSC_HAVE_GETLASTERROR)
    char  *buff = NULL;
    DWORD erc   = GetLastError();
    FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_IGNORE_INSERTS,
		  NULL,erc,MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),(LPSTR)&buff,0,NULL);
    PetscErrorPrintf("Error closing dynamic library:\n  Error message from FreeLibrary() %s\n",buff);
    LocalFree(buff);
#else
    PetscErrorPrintf("Error closing dynamic library:\n  Error message from FreeLibrary() %s\n","unavailable");
#endif
  }
#endif /* !PETSC_HAVE_FREELIBRARY */

  /* 
     --- dclose --- 
  */  
#elif defined(PETSC_HAVE_DLFCN_H)
#if defined(PETSC_HAVE_DLCLOSE)
#if defined(PETSC_HAVE_DLERROR)
  dlerror(); /* clear any previous error */
#endif
  if (dlclose(dlhandle) < 0) {
#if defined(PETSC_HAVE_DLERROR)
    const char *errmsg = dlerror();
#else
    const char *errmsg = "unavailable";
#endif
    PetscErrorPrintf("Error closing dynamic library:\n  Error message from dlclose() %s\n", errmsg);
  }
#endif /* !PETSC_HAVE_DLCLOSE */

  /* 
     --- unimplemented --- 
  */  
#else
  SETERRQ(PETSC_ERR_SUP_SYS, "Cannot use dynamic libraries on this platform");
#endif

  *handle = PETSC_NULL;

  PetscFunctionReturn(0);
}


#undef __FUNCT__  
#define __FUNCT__ "PetscDLSym"
/*@C
   PetscDLSym - 
@*/
PetscErrorCode PETSC_DLLEXPORT PetscDLSym(PetscDLHandle handle,const char symbol[],void **value)
{
  dlhandle_t dlhandle;
  dlsymbol_t dlsymbol;

  PetscFunctionBegin;
  PetscValidCharPointer(symbol,2);
  PetscValidPointer(value,3);

  dlhandle = (dlhandle_t) 0;
  dlsymbol = (dlsymbol_t) 0;

  *value   = (void *) 0;

  /* 
     --- GetProcAddress ---
  */  
#if defined(PETSC_HAVE_WINDOWS_H) 
#if defined(PETSC_HAVE_GETPROCADDRESS)
  if (handle != PETSC_NULL)
    dlhandle = (dlhandle_t) handle;
  else
    dlhandle = (dlhandle_t) GetCurrentProcess();
  dlsymbol = (dlsymbol_t) GetProcAddress(dlhandle,symbol);
#if defined(PETSC_HAVE_SETLASTERROR)
  SetLastError((DWORD)0); /* clear any previous error */
#endif
#endif /* !PETSC_HAVE_GETPROCADDRESS */

  /* 
     --- dlsym ---
  */  
#elif defined(PETSC_HAVE_DLFCN_H)
#if defined(PETSC_HAVE_DLSYM)
  if (handle != PETSC_NULL)
    dlhandle = (dlhandle_t) handle;
  else
    dlhandle = (dlhandle_t) 0;
#if defined(PETSC_HAVE_DLERROR)
  dlerror(); /* clear any previous error */
#endif
  dlsymbol = (dlsymbol_t) dlsym(dlhandle,symbol);
#if defined(PETSC_HAVE_DLERROR)
  dlerror(); /* clear any previous error */
#endif
#endif /* !PETSC_HAVE_DLSYM */

  /* 
     --- unimplemented --- 
  */  
#else
  SETERRQ(PETSC_ERR_SUP_SYS, "Cannot use dynamic libraries on this platform");
#endif

  *value = *((void**)&dlsymbol);

  PetscFunctionReturn(0);
}