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/*
** $Id: lauxlib.c,v 1.5 1997/12/09 13:35:19 roberto Exp roberto $
** Auxiliar functions for building Lua libraries
** See Copyright Notice in lua.h
*/
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include "lauxlib.h"
#include "lmem.h"
#include "lstate.h"
#include "lua.h"
#include "luadebug.h"
void luaL_arg_check (int cond, int numarg, char *extramsg)
{
if (!cond) {
char *funcname;
lua_getobjname(lua_stackedfunction(0), &funcname);
if (funcname == NULL)
funcname = "???";
if (extramsg == NULL)
luaL_verror("bad argument #%d to function `%.50s'", numarg, funcname);
else
luaL_verror("bad argument #%d to function `%.50s' (%.100s)",
numarg, funcname, extramsg);
}
}
char *luaL_check_string (int numArg)
{
lua_Object o = lua_getparam(numArg);
luaL_arg_check(lua_isstring(o), numArg, "string expected");
return lua_getstring(o);
}
char *luaL_opt_string (int numArg, char *def)
{
return (lua_getparam(numArg) == LUA_NOOBJECT) ? def :
luaL_check_string(numArg);
}
double luaL_check_number (int numArg)
{
lua_Object o = lua_getparam(numArg);
luaL_arg_check(lua_isnumber(o), numArg, "number expected");
return lua_getnumber(o);
}
double luaL_opt_number (int numArg, double def)
{
return (lua_getparam(numArg) == LUA_NOOBJECT) ? def :
luaL_check_number(numArg);
}
lua_Object luaL_tablearg (int arg)
{
lua_Object o = lua_getparam(arg);
luaL_arg_check(lua_istable(o), arg, "table expected");
return o;
}
lua_Object luaL_functionarg (int arg)
{
lua_Object o = lua_getparam(arg);
luaL_arg_check(lua_isfunction(o), arg, "function expected");
return o;
}
lua_Object luaL_nonnullarg (int numArg)
{
lua_Object o = lua_getparam(numArg);
luaL_arg_check(o != LUA_NOOBJECT, numArg, "value expected");
return o;
}
void luaL_openlib (struct luaL_reg *l, int n)
{
int i;
lua_open(); /* make sure lua is already open */
for (i=0; i<n; i++)
lua_register(l[i].name, l[i].func);
}
void luaL_verror (char *fmt, ...)
{
char buff[500];
va_list argp;
va_start(argp, fmt);
vsprintf(buff, fmt, argp);
va_end(argp);
lua_error(buff);
}
/*-------------------------------------------------------
** Auxiliar buffer
-------------------------------------------------------*/
#define BUFF_STEP 32
#define openspace(size) if (L->Mbuffnext+(size) > L->Mbuffsize) Openspace(size)
static void Openspace (int size)
{
LState *l = L; /* to optimize */
int base = l->Mbuffbase-l->Mbuffer;
l->Mbuffsize *= 2;
if (l->Mbuffnext+size > l->Mbuffsize) /* still not big enough? */
l->Mbuffsize = l->Mbuffnext+size;
l->Mbuffer = luaM_realloc(l->Mbuffer, l->Mbuffsize);
l->Mbuffbase = l->Mbuffer+base;
}
char *luaL_openspace (int size)
{
openspace(size);
return L->Mbuffer+L->Mbuffnext;
}
void luaL_addchar (int c)
{
openspace(BUFF_STEP);
L->Mbuffer[L->Mbuffnext++] = c;
}
void luaL_resetbuffer (void)
{
L->Mbuffnext = L->Mbuffbase-L->Mbuffer;
}
void luaL_addsize (int n)
{
L->Mbuffnext += n;
}
int luaL_newbuffer (int size)
{
int old = L->Mbuffbase-L->Mbuffer;
openspace(size);
L->Mbuffbase = L->Mbuffer+L->Mbuffnext;
return old;
}
void luaL_oldbuffer (int old)
{
L->Mbuffnext = L->Mbuffbase-L->Mbuffer;
L->Mbuffbase = L->Mbuffer+old;
}
char *luaL_buffer (void)
{
return L->Mbuffbase;
}
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