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/*

** $Id: lauxlib.h $

** 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 "luaconf.h"

#include "lua.h"

/* global table */

#define LUA_GNAME       "_G"

typedef struct luaL_Buffer luaL_Buffer;

/* extra error code for 'luaL_loadfilex' */

#define LUA_ERRFILE     (LUA_ERRERR+1)

/* key, in the registry, for table of loaded modules */

#define LUA_LOADED_TABLE        "_LOADED"

/* key, in the registry, for table of preloaded loaders */

#define LUA_PRELOAD_TABLE       "_PRELOAD"

typedef struct luaL_Reg {

  const char *name;

  lua_CFunction func;

} luaL_Reg;

#define LUAL_NUMSIZES   (sizeof(lua_Integer)*16 + sizeof(lua_Number))

LUALIB_API void (luaL_checkversion_) (lua_State *L, lua_Number ver, size_t sz);

#define luaL_checkversion(L)  \

          luaL_checkversion_(L, LUA_VERSION_NUM, LUAL_NUMSIZES)

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 arg, const char *extramsg);

LUALIB_API int (luaL_typeerror) (lua_State *L, int arg, const char *tname);

LUALIB_API const char *(luaL_checklstring) (lua_State *L, int arg,

                                                          size_t *l);

LUALIB_API const char *(luaL_optlstring) (lua_State *L, int arg,

                                          const char *def, size_t *l);

LUALIB_API lua_Number (luaL_checknumber) (lua_State *L, int arg);

LUALIB_API lua_Number (luaL_optnumber) (lua_State *L, int arg, lua_Number def);

LUALIB_API lua_Integer (luaL_checkinteger) (lua_State *L, int arg);

LUALIB_API lua_Integer (luaL_optinteger) (lua_State *L, int arg,

                                          lua_Integer def);

LUALIB_API void (luaL_checkstack) (lua_State *L, int sz, const char *msg);

LUALIB_API void (luaL_checktype) (lua_State *L, int arg, int t);

LUALIB_API void (luaL_checkany) (lua_State *L, int arg);

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 arg, 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);

/* predefined 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 lua_Integer (luaL_len) (lua_State *L, int idx);

LUALIB_API void (luaL_addgsub) (luaL_Buffer *b, const char *s,

                                     const char *p, const char *r);

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_checkversion(L), luaL_newlibtable(L,l), luaL_setfuncs(L,l,0))

#define luaL_argcheck(L, cond,arg,extramsg)     \

        ((void)(luai_likely(cond) || luaL_argerror(L, (arg), (extramsg))))

#define luaL_argexpected(L,cond,arg,tname)      \

        ((void)(luai_likely(cond) || luaL_typeerror(L, (arg), (tname))))

#define luaL_checkstring(L,n)   (luaL_checklstring(L, (n), NULL))

#define luaL_optstring(L,n,d)   (luaL_optlstring(L, (n), (d), NULL))

#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)

/*

** Perform arithmetic operations on lua_Integer values with wrap-around

** semantics, as the Lua core does.

*/

#define luaL_intop(op,v1,v2)  \

        ((lua_Integer)((lua_Unsigned)(v1) op (lua_Unsigned)(v2)))

/* push the value used to represent failure/error */

#define luaL_pushfail(L)        lua_pushnil(L)

/*

** Internal assertions for in-house debugging

*/

#if !defined(lua_assert)

#if defined LUAI_ASSERT

  #include <assert.h>

  #define lua_assert(c)         assert(c)

#else

  #define lua_assert(c)         ((void)0)

#endif

#endif

/*

** {======================================================

** Generic Buffer manipulation

** =======================================================

*/

struct luaL_Buffer {

  char *b;  /* buffer address */

  size_t size;  /* buffer size */

  size_t n;  /* number of characters in buffer */

  lua_State *L;

  union {

    LUAI_MAXALIGN;  /* ensure maximum alignment for buffer */

    char b[LUAL_BUFFERSIZE];  /* initial buffer */

  } init;

};

#define luaL_bufflen(bf)        ((bf)->n)

#define luaL_buffaddr(bf)       ((bf)->b)

#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))

#define luaL_buffsub(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;

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

/*

** {==================================================================

** "Abstraction Layer" for basic report of messages and errors

** ===================================================================

*/

/* print a string */

#if !defined(lua_writestring)

#define lua_writestring(s,l)   fwrite((s), sizeof(char), (l), stdout)

#endif

/* print a newline and flush the output */

#if !defined(lua_writeline)

#define lua_writeline()        (lua_writestring("\n", 1), fflush(stdout))

#endif

/* print an error message */

#if !defined(lua_writestringerror)

#define lua_writestringerror(s,p) \

        (fprintf(stderr, (s), (p)), fflush(stderr))

#endif

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

/*

** {============================================================

** Compatibility with deprecated conversions

** =============================================================

*/

#if defined(LUA_COMPAT_APIINTCASTS)

#define luaL_checkunsigned(L,a) ((lua_Unsigned)luaL_checkinteger(L,a))

#define luaL_optunsigned(L,a,d) \

        ((lua_Unsigned)luaL_optinteger(L,a,(lua_Integer)(d)))

#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)))

#endif

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

#endif