From 7a1ea510a9fc43ccbc257601b149a90920332e13 Mon Sep 17 00:00:00 2001 From: Alex Auvolat Date: Fri, 15 Jul 2016 22:39:04 +0200 Subject: Add Lua source, not compiled yet as libc/libm functions remain unimplemented --- src/lib/lua/lzio.c | 68 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 68 insertions(+) create mode 100644 src/lib/lua/lzio.c (limited to 'src/lib/lua/lzio.c') diff --git a/src/lib/lua/lzio.c b/src/lib/lua/lzio.c new file mode 100644 index 0000000..c9e1f49 --- /dev/null +++ b/src/lib/lua/lzio.c @@ -0,0 +1,68 @@ +/* +** $Id: lzio.c,v 1.37 2015/09/08 15:41:05 roberto Exp $ +** Buffered streams +** See Copyright Notice in lua.h +*/ + +#define lzio_c +#define LUA_CORE + +#include "lprefix.h" + + +#include + +#include "lua.h" + +#include "llimits.h" +#include "lmem.h" +#include "lstate.h" +#include "lzio.h" + + +int luaZ_fill (ZIO *z) { + size_t size; + lua_State *L = z->L; + const char *buff; + lua_unlock(L); + buff = z->reader(L, z->data, &size); + lua_lock(L); + if (buff == NULL || size == 0) + return EOZ; + z->n = size - 1; /* discount char being returned */ + z->p = buff; + return cast_uchar(*(z->p++)); +} + + +void luaZ_init (lua_State *L, ZIO *z, lua_Reader reader, void *data) { + z->L = L; + z->reader = reader; + z->data = data; + z->n = 0; + z->p = NULL; +} + + +/* --------------------------------------------------------------- read --- */ +size_t luaZ_read (ZIO *z, void *b, size_t n) { + while (n) { + size_t m; + if (z->n == 0) { /* no bytes in buffer? */ + if (luaZ_fill(z) == EOZ) /* try to read more */ + return n; /* no more input; return number of missing bytes */ + else { + z->n++; /* luaZ_fill consumed first byte; put it back */ + z->p--; + } + } + m = (n <= z->n) ? n : z->n; /* min. between n and z->n */ + memcpy(b, z->p, m); + z->n -= m; + z->p += m; + b = (char *)b + m; + n -= m; + } + return 0; +} + -- cgit v1.2.3