#ifndef RUBY_DL_H
#define RUBY_DL_H

#include <ruby.h>

#if !defined(FUNC_CDECL)
#  define FUNC_CDECL(x) x
#endif

#if defined(HAVE_DLFCN_H)
# include <dlfcn.h>
# /* some stranger systems may not define all of these */
#ifndef RTLD_LAZY
#define RTLD_LAZY 0
#endif
#ifndef RTLD_GLOBAL
#define RTLD_GLOBAL 0
#endif
#ifndef RTLD_NOW
#define RTLD_NOW 0
#endif
#else
# if defined(HAVE_WINDOWS_H)
#   include <windows.h>
#   define dlclose(ptr) FreeLibrary((HINSTANCE)ptr)
#   define dlopen(name,flag) ((void*)LoadLibrary(name))
#   define dlerror()    "unknown error"
#   define dlsym(handle,name) ((void*)GetProcAddress(handle,name))
#   define RTLD_LAZY -1
#   define RTLD_NOW  -1
#   define RTLD_GLOBAL -1
# endif
#endif

#define MAX_CALLBACK 5
#define DLSTACK_TYPE long
#define DLSTACK_SIZE (20)
#define DLSTACK_PROTO \
    DLSTACK_TYPE,DLSTACK_TYPE,DLSTACK_TYPE,DLSTACK_TYPE,DLSTACK_TYPE,\
    DLSTACK_TYPE,DLSTACK_TYPE,DLSTACK_TYPE,DLSTACK_TYPE,DLSTACK_TYPE,\
    DLSTACK_TYPE,DLSTACK_TYPE,DLSTACK_TYPE,DLSTACK_TYPE,DLSTACK_TYPE,\
    DLSTACK_TYPE,DLSTACK_TYPE,DLSTACK_TYPE,DLSTACK_TYPE,DLSTACK_TYPE
#define DLSTACK_ARGS(stack) \
    stack[0],stack[1],stack[2],stack[3],stack[4],\
    stack[5],stack[6],stack[7],stack[8],stack[9],\
    stack[10],stack[11],stack[12],stack[13],stack[14],\
    stack[15],stack[16],stack[17],stack[18],stack[19]

#define DLSTACK_PROTO0_ void
#define DLSTACK_PROTO1_ DLSTACK_TYPE
#define DLSTACK_PROTO2_ DLSTACK_PROTO1_, DLSTACK_TYPE
#define DLSTACK_PROTO3_ DLSTACK_PROTO2_, DLSTACK_TYPE
#define DLSTACK_PROTO4_ DLSTACK_PROTO3_, DLSTACK_TYPE
#define DLSTACK_PROTO4_ DLSTACK_PROTO3_, DLSTACK_TYPE
#define DLSTACK_PROTO5_ DLSTACK_PROTO4_, DLSTACK_TYPE
#define DLSTACK_PROTO6_ DLSTACK_PROTO5_, DLSTACK_TYPE
#define DLSTACK_PROTO7_ DLSTACK_PROTO6_, DLSTACK_TYPE
#define DLSTACK_PROTO8_ DLSTACK_PROTO7_, DLSTACK_TYPE
#define DLSTACK_PROTO9_ DLSTACK_PROTO8_, DLSTACK_TYPE
#define DLSTACK_PROTO10_ DLSTACK_PROTO9_, DLSTACK_TYPE
#define DLSTACK_PROTO11_ DLSTACK_PROTO10_, DLSTACK_TYPE
#define DLSTACK_PROTO12_ DLSTACK_PROTO11_, DLSTACK_TYPE
#define DLSTACK_PROTO13_ DLSTACK_PROTO12_, DLSTACK_TYPE
#define DLSTACK_PROTO14_ DLSTACK_PROTO13_, DLSTACK_TYPE
#define DLSTACK_PROTO14_ DLSTACK_PROTO13_, DLSTACK_TYPE
#define DLSTACK_PROTO15_ DLSTACK_PROTO14_, DLSTACK_TYPE
#define DLSTACK_PROTO16_ DLSTACK_PROTO15_, DLSTACK_TYPE
#define DLSTACK_PROTO17_ DLSTACK_PROTO16_, DLSTACK_TYPE
#define DLSTACK_PROTO18_ DLSTACK_PROTO17_, DLSTACK_TYPE
#define DLSTACK_PROTO19_ DLSTACK_PROTO18_, DLSTACK_TYPE
#define DLSTACK_PROTO20_ DLSTACK_PROTO19_, DLSTACK_TYPE

/*
 * Add ",..." as the last argument.
 * This is required for variable argument functions such
 * as fprintf() on x86_64-linux.
 *
 * http://refspecs.linuxfoundation.org/elf/x86_64-abi-0.95.pdf
 * page 19:
 *
 *   For calls that may call functions that use varargs or stdargs
 *   (prototype-less calls or calls to functions containing ellipsis
 *   (...) in the declaration) %al is used as hidden argument to
 *   specify the number of SSE registers used.
 */
#define DLSTACK_PROTO0 void
#define DLSTACK_PROTO1 DLSTACK_PROTO1_, ...
#define DLSTACK_PROTO2 DLSTACK_PROTO2_, ...
#define DLSTACK_PROTO3 DLSTACK_PROTO3_, ...
#define DLSTACK_PROTO4 DLSTACK_PROTO4_, ...
#define DLSTACK_PROTO4 DLSTACK_PROTO4_, ...
#define DLSTACK_PROTO5 DLSTACK_PROTO5_, ...
#define DLSTACK_PROTO6 DLSTACK_PROTO6_, ...
#define DLSTACK_PROTO7 DLSTACK_PROTO7_, ...
#define DLSTACK_PROTO8 DLSTACK_PROTO8_, ...
#define DLSTACK_PROTO9 DLSTACK_PROTO9_, ...
#define DLSTACK_PROTO10 DLSTACK_PROTO10_, ...
#define DLSTACK_PROTO11 DLSTACK_PROTO11_, ...
#define DLSTACK_PROTO12 DLSTACK_PROTO12_, ...
#define DLSTACK_PROTO13 DLSTACK_PROTO13_, ...
#define DLSTACK_PROTO14 DLSTACK_PROTO14_, ...
#define DLSTACK_PROTO14 DLSTACK_PROTO14_, ...
#define DLSTACK_PROTO15 DLSTACK_PROTO15_, ...
#define DLSTACK_PROTO16 DLSTACK_PROTO16_, ...
#define DLSTACK_PROTO17 DLSTACK_PROTO17_, ...
#define DLSTACK_PROTO18 DLSTACK_PROTO18_, ...
#define DLSTACK_PROTO19 DLSTACK_PROTO19_, ...
#define DLSTACK_PROTO20 DLSTACK_PROTO20_, ...

#define DLSTACK_ARGS0(stack)
#define DLSTACK_ARGS1(stack) stack[0]
#define DLSTACK_ARGS2(stack) DLSTACK_ARGS1(stack), stack[1]
#define DLSTACK_ARGS3(stack) DLSTACK_ARGS2(stack), stack[2]
#define DLSTACK_ARGS4(stack) DLSTACK_ARGS3(stack), stack[3]
#define DLSTACK_ARGS5(stack) DLSTACK_ARGS4(stack), stack[4]
#define DLSTACK_ARGS6(stack) DLSTACK_ARGS5(stack), stack[5]
#define DLSTACK_ARGS7(stack) DLSTACK_ARGS6(stack), stack[6]
#define DLSTACK_ARGS8(stack) DLSTACK_ARGS7(stack), stack[7]
#define DLSTACK_ARGS9(stack) DLSTACK_ARGS8(stack), stack[8]
#define DLSTACK_ARGS10(stack) DLSTACK_ARGS9(stack), stack[9]
#define DLSTACK_ARGS11(stack) DLSTACK_ARGS10(stack), stack[10]
#define DLSTACK_ARGS12(stack) DLSTACK_ARGS11(stack), stack[11]
#define DLSTACK_ARGS13(stack) DLSTACK_ARGS12(stack), stack[12]
#define DLSTACK_ARGS14(stack) DLSTACK_ARGS13(stack), stack[13]
#define DLSTACK_ARGS15(stack) DLSTACK_ARGS14(stack), stack[14]
#define DLSTACK_ARGS16(stack) DLSTACK_ARGS15(stack), stack[15]
#define DLSTACK_ARGS17(stack) DLSTACK_ARGS16(stack), stack[16]
#define DLSTACK_ARGS18(stack) DLSTACK_ARGS17(stack), stack[17]
#define DLSTACK_ARGS19(stack) DLSTACK_ARGS18(stack), stack[18]
#define DLSTACK_ARGS20(stack) DLSTACK_ARGS19(stack), stack[19]

extern VALUE rb_mDL;
extern VALUE rb_cDLHandle;
extern VALUE rb_cDLSymbol;
extern VALUE rb_eDLError;
extern VALUE rb_eDLTypeError;

typedef struct { char c; void *x; } s_voidp;
typedef struct { char c; short x; } s_short;
typedef struct { char c; int x; } s_int;
typedef struct { char c; long x; } s_long;
typedef struct { char c; float x; } s_float;
typedef struct { char c; double x; } s_double;
#if HAVE_LONG_LONG
typedef struct { char c; LONG_LONG x; } s_long_long;
#endif

#define ALIGN_VOIDP  (sizeof(s_voidp) - sizeof(void *))
#define ALIGN_SHORT  (sizeof(s_short) - sizeof(short))
#define ALIGN_CHAR   (1)
#define ALIGN_INT    (sizeof(s_int) - sizeof(int))
#define ALIGN_LONG   (sizeof(s_long) - sizeof(long))
#if HAVE_LONG_LONG
#define ALIGN_LONG_LONG (sizeof(s_long_long) - sizeof(LONG_LONG))
#endif
#define ALIGN_FLOAT  (sizeof(s_float) - sizeof(float))
#define ALIGN_DOUBLE (sizeof(s_double) - sizeof(double))

#define DLALIGN(ptr,offset,align) {\
  while( (((unsigned long)((char *)ptr + offset)) % align) != 0 ) offset++;\
}


#define DLTYPE_VOID  0
#define DLTYPE_VOIDP 1
#define DLTYPE_CHAR  2
#define DLTYPE_SHORT 3
#define DLTYPE_INT   4
#define DLTYPE_LONG  5
#if HAVE_LONG_LONG
#define DLTYPE_LONG_LONG 6
#endif
#define DLTYPE_FLOAT 7
#define DLTYPE_DOUBLE 8
#define MAX_DLTYPE 9

#if SIZEOF_VOIDP == SIZEOF_LONG
# define PTR2NUM(x)   (ULONG2NUM((unsigned long)(x)))
# define NUM2PTR(x)   ((void*)(NUM2ULONG(x)))
#else
/* # error --->> Ruby/DL2 requires sizeof(void*) == sizeof(long) to be compiled. <<--- */
# define PTR2NUM(x)   (ULL2NUM((unsigned long long)(x)))
# define NUM2PTR(x)   ((void*)(NUM2ULL(x)))
#endif

#define BOOL2INT(x)  ((x == Qtrue)?1:0)
#define INT2BOOL(x)  (x?Qtrue:Qfalse)

typedef void (*freefunc_t)(void*);

struct dl_handle {
    void *ptr;
    int  open;
    int  enable_close;
};


struct cfunc_data {
    void *ptr;
    char *name;
    int  type;
    ID   calltype;
};
extern ID rbdl_id_cdecl;
extern ID rbdl_id_stdcall;
#define CFUNC_CDECL   (rbdl_id_cdecl)
#define CFUNC_STDCALL (rbdl_id_stdcall)

struct ptr_data {
    void *ptr;
    long size;
    freefunc_t free;
};

#define RDL_HANDLE(obj) ((struct dl_handle *)(DATA_PTR(obj)))
#define RCFUNC_DATA(obj) ((struct cfunc_data *)(DATA_PTR(obj)))
#define RPTR_DATA(obj) ((struct ptr_data *)(DATA_PTR(obj)))

VALUE rb_dlcfunc_new(void (*func)(), int dltype, const char * name, ID calltype);
int rb_dlcfunc_kind_p(VALUE func);
VALUE rb_dlptr_new(void *ptr, long size, freefunc_t func);
VALUE rb_dlptr_new2(VALUE klass, void *ptr, long size, freefunc_t func);
VALUE rb_dlptr_malloc(long size, freefunc_t func);

#endif
