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   1                                 bitlib
   2                                 ------
   3
   4                    by Reuben Thomas <rrt@sc3d.org>
   5                  http://luaforge.net/projects/bitlib
   6
   7
   8 bitlib is a C library for Lua 5.1 that provides bitwise operations. It
   9 is copyright Reuben Thomas 2000-2009, and is released under the MIT
  10 license, like Lua (see http://www.lua.org/copyright.html; it's
  11 basically the same as the BSD license). There is no warranty.
  12
  13 Please report bugs and make suggestions to the email address above, or
  14 use the LuaForge trackers.
  15
  16 Thanks to John Passaniti for his bitwise operations library, some of
  17 whose ideas I used, to Shmuel Zeigerman for the test suite, to
  18 Thatcher Ulrich for portability fixes, and to Enrico Tassi, John
  19 Stiles and Eduardo Ochs for bug reports.
  20
  21
  22 Installation
  23 ------------
  24
  25 As normal:
  26
  27     ./configure && make [&& make check] [&& make install]
  28
  29 If you get warnings about integer constants being too large, don't
  30 worry. They won't be used.
  31
  32 The following options may be of interest if you have Lua installed on
  33 non-default paths (as you are likely to on any system supporting more
  34 than one version of Lua):
  35
  36   --libdir=DIR            Install shared library in this directory
  37   --with-lua-prefix=DIR   Lua files are in DIR
  38   --with-lua-includes=DIR Lua include files are in DIR
  39   --with-lua-libraries=DIR
  40                           Lua library files are in DIR, or "no" if not used
  41   --with-lua-suffix=ARG   Lua binary and library files are suffixed with ARG
  42
  43 For example, on Debian or Ubuntu:
  44
  45   ./configure --libdir=/usr/local/lib/lua/5.1 --with-lua-includes=/usr/include/lua5.1 --with-lua-suffix=5.1 --with-lua-libraries=no
  46
  47
  48 Use
  49 ---
  50
  51 Make sure the library is installed on your LUA_CPATH, and require it.
  52
  53 The library provides the constant bit.bits that gives the number of
  54 bits that can be used in bitwise operations, and the following
  55 functions:
  56
  57 bit.cast(a)        cast a to the internally-used integer type
  58 bit.bnot(a)        returns the one's complement of a
  59 bit.band(w1, ...)  returns the bitwise and of the w's
  60 bit.bor(w1, ...)   returns the bitwise or of the w's
  61 bit.bxor(w1, ...)  returns the bitwise exclusive or of the w's
  62 bit.lshift(a, b)   returns a shifted left b places
  63 bit.rshift(a, b)   returns a shifted logically right b places
  64 bit.arshift(a, b)  returns a shifted arithmetically right b places
  65
  66 All function arguments should be integers that fit into the C type
  67 lua_Integer.
  68
  69 The logical operations start with "b" for "bit" to avoid clashing with
  70 reserved words; although "xor" isn't a reserved word, it seemed better
  71 to use "bxor" for consistency.