diff options
Diffstat (limited to 'src/lbuffer.c')
-rw-r--r-- | src/lbuffer.c | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/src/lbuffer.c b/src/lbuffer.c new file mode 100644 index 00000000..d298b13a --- /dev/null +++ b/src/lbuffer.c @@ -0,0 +1,85 @@ +/* +** $Id: lbuffer.c,v 1.4 1998/06/19 16:14:09 roberto Exp $ +** 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; +} + |