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/*
** $Id: lbuffer.c,v 1.14 2000/06/12 13:52:05 roberto Exp roberto $
** Auxiliary functions for building Lua libraries
** See Copyright Notice in lua.h
*/
#include <stdio.h>
#include "lua.h"
#include "lauxlib.h"
#include "lmem.h"
#include "lstate.h"
/*-------------------------------------------------------
** Auxiliary buffer
-------------------------------------------------------*/
/*
** amount of extra space (pre)allocated when buffer is reallocated
*/
#define EXTRABUFF 32
#define openspace(L, size) if ((size_t)(size) > L->Mbuffsize-L->Mbuffnext) \
Openspace(L, size)
static void Openspace (lua_State *L, size_t size) {
lint32 newsize = ((lint32)L->Mbuffnext+size+EXTRABUFF)*2;
luaM_reallocvector(L, L->Mbuffer, newsize, char);
L->Mbuffsize = newsize;
}
char *luaL_openspace (lua_State *L, size_t size) {
openspace(L, size);
return L->Mbuffer+L->Mbuffnext;
}
void luaL_addchar (lua_State *L, int c) {
openspace(L, 1);
L->Mbuffer[L->Mbuffnext++] = (char)c;
}
void luaL_resetbuffer (lua_State *L) {
L->Mbuffnext = L->Mbuffbase;
}
void luaL_addsize (lua_State *L, size_t n) {
L->Mbuffnext += n;
}
size_t luaL_getsize (lua_State *L) {
return L->Mbuffnext-L->Mbuffbase;
}
size_t luaL_newbuffer (lua_State *L, size_t size) {
size_t old = L->Mbuffbase;
openspace(L, size);
L->Mbuffbase = L->Mbuffnext;
return old;
}
void luaL_oldbuffer (lua_State *L, size_t old) {
L->Mbuffnext = L->Mbuffbase;
L->Mbuffbase = old;
}
char *luaL_buffer (lua_State *L) {
return L->Mbuffer+L->Mbuffbase;
}
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