| /* |
| ** $Id: lbuffer.c,v 1.11 1999/11/22 13:12:07 roberto Exp roberto $ |
| ** Auxiliary functions for building Lua libraries |
| ** See Copyright Notice in lua.h |
| */ |
| |
| |
| #include <stdio.h> |
| |
| #define LUA_REENTRANT |
| |
| #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 (L->Mbuffnext+(size) > L->Mbuffsize) \ |
| Openspace(L, size) |
| |
| static void Openspace (lua_State *L, int size) { |
| L->Mbuffsize = (L->Mbuffnext+size+EXTRABUFF)*2; |
| luaM_reallocvector(L, L->Mbuffer, L->Mbuffsize, char); |
| } |
| |
| |
| char *luaL_openspace (lua_State *L, int 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, int n) { |
| L->Mbuffnext += n; |
| } |
| |
| int luaL_getsize (lua_State *L) { |
| return L->Mbuffnext-L->Mbuffbase; |
| } |
| |
| int luaL_newbuffer (lua_State *L, int size) { |
| int old = L->Mbuffbase; |
| openspace(L, size); |
| L->Mbuffbase = L->Mbuffnext; |
| return old; |
| } |
| |
| |
| void luaL_oldbuffer (lua_State *L, int old) { |
| L->Mbuffnext = L->Mbuffbase; |
| L->Mbuffbase = old; |
| } |
| |
| |
| char *luaL_buffer (lua_State *L) { |
| return L->Mbuffer+L->Mbuffbase; |
| } |
| |