mirror of https://github.com/lua/lua
75 lines
1.3 KiB
C
75 lines
1.3 KiB
C
/*
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** $Id: lbuffer.c,v 1.9 1999/02/26 15:48:55 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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#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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#define EXTRABUFF 32
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#define openspace(size) if (L->Mbuffnext+(size) > L->Mbuffsize) Openspace(size)
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static void Openspace (int size) {
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lua_State *l = L; /* to optimize */
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l->Mbuffsize = (l->Mbuffnext+size+EXTRABUFF)*2;
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luaM_reallocvector(l->Mbuffer, l->Mbuffsize, char);
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}
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char *luaL_openspace (int size) {
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openspace(size);
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return L->Mbuffer+L->Mbuffnext;
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}
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void luaL_addchar (int c) {
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openspace(1);
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L->Mbuffer[L->Mbuffnext++] = (char)c;
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}
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void luaL_resetbuffer (void) {
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L->Mbuffnext = L->Mbuffbase;
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}
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void luaL_addsize (int n) {
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L->Mbuffnext += n;
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}
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int luaL_getsize (void) {
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return L->Mbuffnext-L->Mbuffbase;
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}
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int luaL_newbuffer (int size) {
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int old = L->Mbuffbase;
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openspace(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 (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 (void) {
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return L->Mbuffer+L->Mbuffbase;
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}
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