/*
** $Id: lauxlib.h,v 1.43 2002/03/20 12:54:08 roberto Exp roberto $
** Auxiliary functions for building Lua libraries
** See Copyright Notice in lua.h
*/


#ifndef lauxlib_h
#define lauxlib_h


#include <stddef.h>
#include <stdio.h>

#include "lua.h"


#ifndef LUALIB_API
#define LUALIB_API	extern
#endif



typedef struct luaL_reg {
  const char *name;
  lua_CFunction func;
} luaL_reg;


LUALIB_API void luaL_openlib (lua_State *L, const luaL_reg *l, int nup);
LUALIB_API void luaL_opennamedlib (lua_State *L, const char *libname,
                                   const luaL_reg *l, int nup);
LUALIB_API int luaL_callmeta (lua_State *L, int obj, const char *event);
LUALIB_API void luaL_typerror (lua_State *L, int narg, const char *tname);
LUALIB_API void luaL_argerror (lua_State *L, int numarg,
                               const char *extramsg);
LUALIB_API const char *luaL_check_lstr (lua_State *L, int numArg,
                                            size_t *len);
LUALIB_API const char *luaL_opt_lstr (lua_State *L, int numArg,
                                          const char *def, size_t *len);
LUALIB_API lua_Number luaL_check_number (lua_State *L, int numArg);
LUALIB_API lua_Number luaL_opt_number (lua_State *L, int nArg, lua_Number def);

LUALIB_API void luaL_check_stack (lua_State *L, int space, const char *msg);
LUALIB_API void luaL_check_type (lua_State *L, int narg, int t);
LUALIB_API void luaL_check_any (lua_State *L, int narg);

LUALIB_API void luaL_verror (lua_State *L, const char *fmt, ...);
LUALIB_API int luaL_findstring (const char *name, 
                                const char *const list[]);

LUALIB_API int luaL_ref (lua_State *L, int t);
LUALIB_API void luaL_unref (lua_State *L, int t, int ref);

/* error messages corresponding to error codes */
LUALIB_API const char *luaL_errstr (int errcode);


/*
** ===============================================================
** some useful macros
** ===============================================================
*/

#define luaL_arg_check(L, cond,numarg,extramsg) if (!(cond)) \
                                               luaL_argerror(L, numarg,extramsg)
#define luaL_check_string(L,n)	(luaL_check_lstr(L, (n), NULL))
#define luaL_opt_string(L,n,d)	(luaL_opt_lstr(L, (n), (d), NULL))
#define luaL_check_int(L,n)	((int)luaL_check_number(L, n))
#define luaL_check_long(L,n)	((long)luaL_check_number(L, n))
#define luaL_opt_int(L,n,d)	((int)luaL_opt_number(L, n,d))
#define luaL_opt_long(L,n,d)	((long)luaL_opt_number(L, n,d))


/*
** {======================================================
** Generic Buffer manipulation
** =======================================================
*/


#ifndef LUAL_BUFFERSIZE
#define LUAL_BUFFERSIZE	  BUFSIZ
#endif


typedef struct luaL_Buffer {
  char *p;			/* current position in buffer */
  int level;
  lua_State *L;
  char buffer[LUAL_BUFFERSIZE];
} luaL_Buffer;

#define luaL_putchar(B,c) \
  ((void)((B)->p < ((B)->buffer+LUAL_BUFFERSIZE) || luaL_prepbuffer(B)), \
   (*(B)->p++ = (char)(c)))

#define luaL_addsize(B,n)	((B)->p += (n))

LUALIB_API void luaL_buffinit (lua_State *L, luaL_Buffer *B);
LUALIB_API char *luaL_prepbuffer (luaL_Buffer *B);
LUALIB_API void luaL_addlstring (luaL_Buffer *B, const char *s, size_t l);
LUALIB_API void luaL_addstring (luaL_Buffer *B, const char *s);
LUALIB_API void luaL_addvalue (luaL_Buffer *B);
LUALIB_API void luaL_pushresult (luaL_Buffer *B);


/* }====================================================== */



/*
** Compatibility macros
*/

#define luaL_checktype  luaL_check_type
#define luaL_checkany   luaL_check_any


#endif