1 files changed, 74 insertions, 0 deletions

diff --git a/src/lib_bit.c b/src/lib_bit.c
new file mode 100644
index 00000000..2f727e68
--- /dev/null
+++ b/src/lib_bit.c
@@ -0,0 +1,74 @@
+/*
+** Bit manipulation library.
+** Copyright (C) 2005-2009 Mike Pall. See Copyright Notice in luajit.h
+*/
+
+#define lib_bit_c
+#define LUA_LIB
+
+#include "lua.h"
+#include "lauxlib.h"
+#include "lualib.h"
+
+#include "lj_obj.h"
+#include "lj_err.h"
+#include "lj_str.h"
+#include "lj_lib.h"
+
+/* ------------------------------------------------------------------------ */
+
+#define LJLIB_MODULE_bit
+
+LJLIB_ASM(bit_tobit)            LJLIB_REC(bit_unary IR_TOBIT)
+{
+  lj_lib_checknum(L, 1);
+  return FFH_RETRY;
+}
+LJLIB_ASM_(bit_bnot)            LJLIB_REC(bit_unary IR_BNOT)
+LJLIB_ASM_(bit_bswap)           LJLIB_REC(bit_unary IR_BSWAP)
+
+LJLIB_ASM(bit_lshift)           LJLIB_REC(bit_shift IR_BSHL)
+{
+  lj_lib_checknum(L, 1);
+  lj_lib_checknum(L, 2);
+  return FFH_RETRY;
+}
+LJLIB_ASM_(bit_rshift)          LJLIB_REC(bit_shift IR_BSHR)
+LJLIB_ASM_(bit_arshift)         LJLIB_REC(bit_shift IR_BSAR)
+LJLIB_ASM_(bit_rol)             LJLIB_REC(bit_shift IR_BROL)
+LJLIB_ASM_(bit_ror)             LJLIB_REC(bit_shift IR_BROR)
+
+LJLIB_ASM(bit_band)             LJLIB_REC(bit_nary IR_BAND)
+{
+  int i = 0;
+  do { lj_lib_checknum(L, ++i); } while (L->base+i < L->top);
+  return FFH_RETRY;
+}
+LJLIB_ASM_(bit_bor)             LJLIB_REC(bit_nary IR_BOR)
+LJLIB_ASM_(bit_bxor)            LJLIB_REC(bit_nary IR_BXOR)
+
+/* ------------------------------------------------------------------------ */
+
+LJLIB_CF(bit_tohex)
+{
+  uint32_t b = (uint32_t)lj_num2bit(lj_lib_checknum(L, 1));
+  int32_t i, n = L->base+1 >= L->top ? 8 : lj_num2bit(lj_lib_checknum(L, 2));
+  const char *hexdigits = "0123456789abcdef";
+  char buf[8];
+  if (n < 0) { n = -n; hexdigits = "0123456789ABCDEF"; }
+  if (n > 8) n = 8;
+  for (i = n; --i >= 0; ) { buf[i] = hexdigits[b & 15]; b >>= 4; }
+  lua_pushlstring(L, buf, (size_t)n);
+  return 1;
+}
+
+/* ------------------------------------------------------------------------ */
+
+#include "lj_libdef.h"
+
+LUALIB_API int luaopen_bit(lua_State *L)
+{
+  LJ_LIB_REG(L, bit);
+  return 1;
+}
+