mirror of https://github.com/lua/lua
86 lines
1.5 KiB
C
86 lines
1.5 KiB
C
/*
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** $Id: lbuffer.c,v 1.4 1998/06/19 16:14:09 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 BUFF_STEP 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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{
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lua_State *l = L; /* to optimize */
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int base = l->Mbuffbase-l->Mbuffer;
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l->Mbuffsize *= 2;
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if (l->Mbuffnext+size > l->Mbuffsize) /* still not big enough? */
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l->Mbuffsize = l->Mbuffnext+size;
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l->Mbuffer = luaM_realloc(l->Mbuffer, l->Mbuffsize);
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l->Mbuffbase = l->Mbuffer+base;
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}
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char *luaL_openspace (int size)
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{
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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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{
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openspace(BUFF_STEP);
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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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{
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L->Mbuffnext = L->Mbuffbase-L->Mbuffer;
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}
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void luaL_addsize (int n)
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{
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L->Mbuffnext += n;
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}
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int luaL_getsize (void)
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{
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return L->Mbuffnext-(L->Mbuffbase-L->Mbuffer);
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}
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int luaL_newbuffer (int size)
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{
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int old = L->Mbuffbase-L->Mbuffer;
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openspace(size);
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L->Mbuffbase = L->Mbuffer+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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{
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L->Mbuffnext = L->Mbuffbase-L->Mbuffer;
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L->Mbuffbase = L->Mbuffer+old;
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}
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char *luaL_buffer (void)
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{
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return L->Mbuffbase;
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}
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