187 lines
6.7 KiB
Diff
187 lines
6.7 KiB
Diff
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Index: lua-5.1.4/src/Makefile
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===================================================================
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--- lua-5.1.4.orig/src/Makefile 2008-09-25 13:08:31.000000000 +0200
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+++ lua-5.1.4/src/Makefile 2008-09-25 13:08:43.000000000 +0200
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@@ -29,7 +29,7 @@
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lobject.o lopcodes.o lparser.o lstate.o lstring.o ltable.o ltm.o \
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lundump.o lvm.o lzio.o lnum.o
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LIB_O= lauxlib.o lbaselib.o ldblib.o liolib.o lmathlib.o loslib.o ltablib.o \
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- lstrlib.o loadlib.o linit.o lposix.o
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+ lstrlib.o loadlib.o linit.o lposix.o lbitlib.o
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LUA_T= lua
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LUA_O= lua.o
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Index: lua-5.1.4/src/bit_limits.h
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===================================================================
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--- /dev/null 1970-01-01 00:00:00.000000000 +0000
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+++ lua-5.1.4/src/bit_limits.h 2008-09-25 13:09:16.000000000 +0200
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@@ -0,0 +1,4 @@
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+#define BITLIB_FLOAT_BITS 53
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+#define BITLIB_FLOAT_MAX 0xfffffffffffffL
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+#define BITLIB_FLOAT_MIN (-0x10000000000000L)
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+#define BITLIB_FLOAT_UMAX 0x1fffffffffffffUL
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Index: lua-5.1.4/src/lbitlib.c
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===================================================================
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--- /dev/null 1970-01-01 00:00:00.000000000 +0000
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+++ lua-5.1.4/src/lbitlib.c 2008-09-25 13:05:15.000000000 +0200
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@@ -0,0 +1,133 @@
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+/* Bitwise operations library */
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+/* (c) Reuben Thomas 2000-2008 */
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+/* See README for license */
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+
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+#include "lua.h"
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+#include "lauxlib.h"
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+#include "limits.h"
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+
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+#include "bit_limits.h"
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+
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+
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+/* FIXME: Assume lua_Integer is int */
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+#define LUA_INTEGER_MAX INT_MAX
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+#define LUA_INTEGER_MIN INT_MIN
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+
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+/* FIXME: Assume uint is an unsigned lua_Integer */
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+typedef unsigned int lua_UInteger;
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+#define LUA_UINTEGER_MAX UINT_MAX
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+
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+
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+/* Bit type size and limits */
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+
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+#define BIT_BITS \
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+ (CHAR_BIT * sizeof(lua_Integer) > BITLIB_FLOAT_BITS ? \
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+ BITLIB_FLOAT_BITS : (CHAR_BIT * sizeof(lua_Integer)))
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+
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+/* This code may give warnings if BITLIB_FLOAT_* are too big to fit in
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+ long, but that doesn't matter since in that case they won't be
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+ used. */
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+#define BIT_MAX \
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+ (CHAR_BIT * sizeof(lua_Integer) > BITLIB_FLOAT_BITS ? BITLIB_FLOAT_MAX : LUA_INTEGER_MAX)
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+
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+#define BIT_MIN \
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+ (CHAR_BIT * sizeof(lua_Integer) > BITLIB_FLOAT_BITS ? BITLIB_FLOAT_MIN : LUA_INTEGER_MIN)
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+
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+#define BIT_UMAX \
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+ (CHAR_BIT * sizeof(lua_Integer) > BITLIB_FLOAT_BITS ? BITLIB_FLOAT_UMAX : LUA_UINTEGER_MAX)
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+
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+
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+/* Define TOBIT to get a bit value */
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+#ifdef BUILTIN_CAST
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+#define
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+#define TOBIT(L, n, res) \
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+ ((void)(res), luaL_checkinteger((L), (n)))
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+#else
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+#include <stdint.h>
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+#include <math.h>
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+
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+/* FIXME: Assume lua_Number fits in a double (use of fmod). */
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+#define TOBIT(L, n, res) \
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+ ((lua_Integer)(((res) = fmod(luaL_checknumber(L, (n)), (double)BIT_UMAX + 1.0)), \
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+ (res) > BIT_MAX ? ((res) -= (double)BIT_UMAX, (res) -= 1) : \
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+ ((res) < BIT_MIN ? ((res) += (double)BIT_UMAX, (res) += 1) : (res))))
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+#endif
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+
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+
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+#define BIT_TRUNCATE(i) \
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+ ((i) & BIT_UMAX)
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+
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+
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+/* Operations
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+
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+ The macros MONADIC and VARIADIC only deal with bitwise operations.
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+
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+ LOGICAL_SHIFT truncates its left-hand operand before shifting so
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+ that any extra bits at the most-significant end are not shifted
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+ into the result.
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+
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+ ARITHMETIC_SHIFT does not truncate its left-hand operand, so that
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+ the sign bits are not removed and right shift work properly.
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+ */
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+
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+#define MONADIC(name, op) \
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+ static int bit_ ## name(lua_State *L) { \
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+ lua_Number f; \
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+ lua_pushinteger(L, BIT_TRUNCATE(op TOBIT(L, 1, f))); \
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+ return 1; \
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+ }
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+
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+#define VARIADIC(name, op) \
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+ static int bit_ ## name(lua_State *L) { \
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+ lua_Number f; \
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+ int n = lua_gettop(L), i; \
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+ lua_Integer w = TOBIT(L, 1, f); \
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+ for (i = 2; i <= n; i++) \
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+ w op TOBIT(L, i, f); \
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+ lua_pushinteger(L, BIT_TRUNCATE(w)); \
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+ return 1; \
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+ }
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+
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+#define LOGICAL_SHIFT(name, op) \
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+ static int bit_ ## name(lua_State *L) { \
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+ lua_Number f; \
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+ lua_pushinteger(L, BIT_TRUNCATE(BIT_TRUNCATE((lua_UInteger)TOBIT(L, 1, f)) op \
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+ (unsigned)luaL_checknumber(L, 2))); \
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+ return 1; \
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+ }
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+
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+#define ARITHMETIC_SHIFT(name, op) \
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+ static int bit_ ## name(lua_State *L) { \
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+ lua_Number f; \
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+ lua_pushinteger(L, BIT_TRUNCATE((lua_Integer)TOBIT(L, 1, f) op \
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+ (unsigned)luaL_checknumber(L, 2))); \
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+ return 1; \
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+ }
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+
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+MONADIC(cast, +)
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+MONADIC(bnot, ~)
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+VARIADIC(band, &=)
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+VARIADIC(bor, |=)
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+VARIADIC(bxor, ^=)
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+ARITHMETIC_SHIFT(lshift, <<)
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+LOGICAL_SHIFT(rshift, >>)
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+ARITHMETIC_SHIFT(arshift, >>)
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+
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+static const struct luaL_reg bitlib[] = {
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+ {"cast", bit_cast},
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+ {"bnot", bit_bnot},
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+ {"band", bit_band},
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+ {"bor", bit_bor},
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+ {"bxor", bit_bxor},
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+ {"lshift", bit_lshift},
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+ {"rshift", bit_rshift},
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+ {"arshift", bit_arshift},
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+ {NULL, NULL}
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+};
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+
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+LUALIB_API int luaopen_bit (lua_State *L) {
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+ luaL_register(L, "bit", bitlib);
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+ lua_pushnumber(L, BIT_BITS);
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+ lua_setfield(L, -2, "bits");
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+ return 1;
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+}
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Index: lua-5.1.4/src/linit.c
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===================================================================
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--- lua-5.1.4.orig/src/linit.c 2008-09-25 13:08:11.000000000 +0200
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+++ lua-5.1.4/src/linit.c 2008-09-25 13:08:27.000000000 +0200
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@@ -24,6 +24,7 @@
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{LUA_MATHLIBNAME, luaopen_math},
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{LUA_DBLIBNAME, luaopen_debug},
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{LUA_POSIXLIBNAME, luaopen_posix},
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+ {LUA_BITLIBNAME, luaopen_bit},
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{NULL, NULL}
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};
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Index: lua-5.1.4/src/lualib.h
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===================================================================
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--- lua-5.1.4.orig/src/lualib.h 2008-09-25 13:07:29.000000000 +0200
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+++ lua-5.1.4/src/lualib.h 2008-09-25 13:08:06.000000000 +0200
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@@ -42,6 +42,9 @@
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#define LUA_POSIXLIBNAME "posix"
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LUALIB_API int (luaopen_posix) (lua_State *L);
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+#define LUA_BITLIBNAME "bit"
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+LUALIB_API int (luaopen_bit) (lua_State *L);
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+
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/* open all previous libraries */
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LUALIB_API void (luaL_openlibs) (lua_State *L);
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