| /* |
| ** $Id: lbuffer.c,v 1.3 1998/06/02 20:37:04 roberto Exp roberto $ |
| ** Auxiliary functions for building Lua libraries |
| ** See Copyright Notice in lua.h |
| */ |
| |
| |
| #include <stdio.h> |
| |
| #include "lauxlib.h" |
| #include "lmem.h" |
| #include "lstate.h" |
| |
| |
| /*------------------------------------------------------- |
| ** Auxiliary buffer |
| -------------------------------------------------------*/ |
| |
| #define BUFF_STEP 32 |
| |
| #define openspace(size) if (L->Mbuffnext+(size) > L->Mbuffsize) Openspace(size) |
| |
| static void Openspace (int size) |
| { |
| lua_State *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_getsize (void) |
| { |
| return L->Mbuffnext-(L->Mbuffbase-L->Mbuffer); |
| } |
| |
| 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; |
| } |
| |