/*
** $Id: lauxlib.h,v 1.120 2011/11/29 15:55:08 roberto Exp $
** 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"



/* extra error code for `luaL_load' */
#define LUA_ERRFILE     (LUA_ERRERR+1)


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


LUALIB_API void (luaL_checkversion_)(lua_State *L, lua_Number ver);
#define luaL_checkversion(L) luaL_checkversion_(L, LUA_VERSION_NUM)

LUALIB_API int (luaL_getmetafield)(lua_State *L, int obj, const char *e);
LUALIB_API int (luaL_callmeta)(lua_State *L, int obj, const char *e);
LUALIB_API const char *(luaL_tolstring)(lua_State *L, int idx, size_t *len);
LUALIB_API int (luaL_argerror)(lua_State *L, int numarg, const char *extramsg);
LUALIB_API const char *(luaL_checklstring)(lua_State *L, int numArg,
                                           size_t *l);
LUALIB_API const char *(luaL_optlstring)(lua_State *L, int numArg,
                                         const char *def, size_t *l);
LUALIB_API lua_Number(luaL_checknumber)(lua_State *L, int numArg);
LUALIB_API lua_Number(luaL_optnumber)(lua_State *L, int nArg, lua_Number def);

LUALIB_API lua_Integer(luaL_checkinteger)(lua_State *L, int numArg);
LUALIB_API lua_Integer(luaL_optinteger)(lua_State *L, int nArg,
                                        lua_Integer def);
LUALIB_API lua_Unsigned(luaL_checkunsigned)(lua_State *L, int numArg);
LUALIB_API lua_Unsigned(luaL_optunsigned)(lua_State *L, int numArg,
                                          lua_Unsigned def);

LUALIB_API void (luaL_checkstack)(lua_State *L, int sz, const char *msg);
LUALIB_API void (luaL_checktype)(lua_State *L, int narg, int t);
LUALIB_API void (luaL_checkany)(lua_State *L, int narg);

LUALIB_API int (luaL_newmetatable)(lua_State *L, const char *tname);
LUALIB_API void (luaL_setmetatable)(lua_State *L, const char *tname);
LUALIB_API void *(luaL_testudata)(lua_State *L, int ud, const char *tname);
LUALIB_API void *(luaL_checkudata)(lua_State *L, int ud, const char *tname);

LUALIB_API void (luaL_where)(lua_State *L, int lvl);
LUALIB_API int (luaL_error)(lua_State *L, const char *fmt, ...);

LUALIB_API int (luaL_checkoption)(lua_State *L, int narg, const char *def,
                                  const char *const lst[]);

LUALIB_API int (luaL_fileresult)(lua_State *L, int stat, const char *fname);
LUALIB_API int (luaL_execresult)(lua_State *L, int stat);

/* pre-defined references */
#define LUA_NOREF       (-2)
#define LUA_REFNIL      (-1)

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

LUALIB_API int (luaL_loadfilex)(lua_State *L, const char *filename,
                                const char *mode);

#define luaL_loadfile(L,f) luaL_loadfilex(L,f,NULL)

LUALIB_API int (luaL_loadbufferx)(lua_State *L, const char *buff, size_t sz,
                                  const char *name, const char *mode);
LUALIB_API int (luaL_loadstring)(lua_State *L, const char *s);

LUALIB_API lua_State *(luaL_newstate)(void);

LUALIB_API int (luaL_len)(lua_State *L, int idx);

LUALIB_API const char *(luaL_gsub)(lua_State *L, const char *s, const char *p,
                                   const char *r);

LUALIB_API void (luaL_setfuncs)(lua_State *L, const luaL_Reg *l, int nup);

LUALIB_API int (luaL_getsubtable)(lua_State *L, int idx, const char *fname);

LUALIB_API void (luaL_traceback)(lua_State *L, lua_State *L1,
                                 const char *msg, int level);

LUALIB_API void (luaL_requiref)(lua_State *L, const char *modname,
                                lua_CFunction openf, int glb);

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


#define luaL_newlibtable(L,l) \
    lua_createtable(L, 0, sizeof(l)/sizeof((l)[0]) - 1)

#define luaL_newlib(L,l) (luaL_newlibtable(L,l), luaL_setfuncs(L,l,0))

#define luaL_argcheck(L, cond,numarg,extramsg) \
    ((void)((cond) || luaL_argerror(L, (numarg), (extramsg))))
#define luaL_checkstring(L,n) (luaL_checklstring(L, (n), NULL))
#define luaL_optstring(L,n,d) (luaL_optlstring(L, (n), (d), NULL))
#define luaL_checkint(L,n) ((int)luaL_checkinteger(L, (n)))
#define luaL_optint(L,n,d) ((int)luaL_optinteger(L, (n), (d)))
#define luaL_checklong(L,n) ((long)luaL_checkinteger(L, (n)))
#define luaL_optlong(L,n,d) ((long)luaL_optinteger(L, (n), (d)))

#define luaL_typename(L,i) lua_typename(L, lua_type(L,(i)))

#define luaL_dofile(L, fn) \
    (luaL_loadfile(L, fn) || lua_pcall(L, 0, LUA_MULTRET, 0))

#define luaL_dostring(L, s) \
    (luaL_loadstring(L, s) || lua_pcall(L, 0, LUA_MULTRET, 0))

#define luaL_getmetatable(L,n) (lua_getfield(L, LUA_REGISTRYINDEX, (n)))

#define luaL_opt(L,f,n,d) (lua_isnoneornil(L,(n)) ? (d) : f(L,(n)))

#define luaL_loadbuffer(L,s,sz,n) luaL_loadbufferx(L,s,sz,n,NULL)


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

typedef struct luaL_Buffer {
    char *b;  /* buffer address */
    size_t size;  /* buffer size */
    size_t n;  /* number of characters in buffer */
    lua_State *L;
    char initb[LUAL_BUFFERSIZE];  /* initial buffer */
} luaL_Buffer;


#define luaL_addchar(B,c) \
    ((void)((B)->n < (B)->size || luaL_prepbuffsize((B), 1)), \
     ((B)->b[(B)->n++] = (c)))

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

LUALIB_API void (luaL_buffinit)(lua_State *L, luaL_Buffer *B);
LUALIB_API char *(luaL_prepbuffsize)(luaL_Buffer *B, size_t sz);
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);
LUALIB_API void (luaL_pushresultsize)(luaL_Buffer *B, size_t sz);
LUALIB_API char *(luaL_buffinitsize)(lua_State *L, luaL_Buffer *B, size_t sz);

#define luaL_prepbuffer(B) luaL_prepbuffsize(B, LUAL_BUFFERSIZE)

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



/*
** {======================================================
** File handles for IO library
** =======================================================
*/

/*
** A file handle is a userdata with metatable 'LUA_FILEHANDLE' and
** initial structure 'luaL_Stream' (it may contain other fields
** after that initial structure).
*/

#define LUA_FILEHANDLE          "FILE*"


typedef struct luaL_Stream {
    FILE *f;  /* stream (NULL for incompletely created streams) */
    lua_CFunction closef;  /* to close stream (NULL for closed streams) */
} luaL_Stream;

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



/* compatibility with old module system */
#if defined(LUA_COMPAT_MODULE)

LUALIB_API void (luaL_pushmodule)(lua_State *L, const char *modname,
                                  int sizehint);
LUALIB_API void (luaL_openlib)(lua_State *L, const char *libname,
                               const luaL_Reg *l, int nup);

#define luaL_register(L,n,l) (luaL_openlib(L,(n),(l),0))

#endif


#endif


