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79 lines
1.5 KiB
79 lines
1.5 KiB
/*
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** $Id: lbuffer.c,v 1.11 1999/11/22 13:12:07 roberto Exp roberto $
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** Auxiliary functions for building Lua libraries
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** See Copyright Notice in lua.h
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*/
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#include <stdio.h>
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#define LUA_REENTRANT
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#include "lauxlib.h"
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#include "lmem.h"
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#include "lstate.h"
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/*-------------------------------------------------------
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** Auxiliary buffer
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-------------------------------------------------------*/
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/*
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** amount of extra space (pre)allocated when buffer is reallocated
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*/
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#define EXTRABUFF 32
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#define openspace(L, size) if (L->Mbuffnext+(size) > L->Mbuffsize) \
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Openspace(L, size)
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static void Openspace (lua_State *L, int size) {
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L->Mbuffsize = (L->Mbuffnext+size+EXTRABUFF)*2;
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luaM_reallocvector(L, L->Mbuffer, L->Mbuffsize, char);
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}
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char *luaL_openspace (lua_State *L, int size) {
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openspace(L, size);
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return L->Mbuffer+L->Mbuffnext;
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}
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void luaL_addchar (lua_State *L, int c) {
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openspace(L, 1);
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L->Mbuffer[L->Mbuffnext++] = (char)c;
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}
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void luaL_resetbuffer (lua_State *L) {
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L->Mbuffnext = L->Mbuffbase;
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}
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void luaL_addsize (lua_State *L, int n) {
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L->Mbuffnext += n;
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}
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int luaL_getsize (lua_State *L) {
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return L->Mbuffnext-L->Mbuffbase;
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}
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int luaL_newbuffer (lua_State *L, int size) {
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int old = L->Mbuffbase;
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openspace(L, size);
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L->Mbuffbase = L->Mbuffnext;
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return old;
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}
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void luaL_oldbuffer (lua_State *L, int old) {
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L->Mbuffnext = L->Mbuffbase;
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L->Mbuffbase = old;
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}
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char *luaL_buffer (lua_State *L) {
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return L->Mbuffer+L->Mbuffbase;
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}
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