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72 lines
2.5 KiB
Text
72 lines
2.5 KiB
Text
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bitlib
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------
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by Reuben Thomas <rrt@sc3d.org>
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http://luaforge.net/projects/bitlib
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bitlib is a C library for Lua 5.1 that provides bitwise operations. It
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is copyright Reuben Thomas 2000-2009, and is released under the MIT
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license, like Lua (see http://www.lua.org/copyright.html; it's
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basically the same as the BSD license). There is no warranty.
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Please report bugs and make suggestions to the email address above, or
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use the LuaForge trackers.
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Thanks to John Passaniti for his bitwise operations library, some of
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whose ideas I used, to Shmuel Zeigerman for the test suite, to
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Thatcher Ulrich for portability fixes, and to Enrico Tassi, John
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Stiles and Eduardo Ochs for bug reports.
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Installation
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------------
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As normal:
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./configure && make [&& make check] [&& make install]
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If you get warnings about integer constants being too large, don't
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worry. They won't be used.
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The following options may be of interest if you have Lua installed on
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non-default paths (as you are likely to on any system supporting more
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than one version of Lua):
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--libdir=DIR Install shared library in this directory
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--with-lua-prefix=DIR Lua files are in DIR
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--with-lua-includes=DIR Lua include files are in DIR
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--with-lua-libraries=DIR
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Lua library files are in DIR, or "no" if not used
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--with-lua-suffix=ARG Lua binary and library files are suffixed with ARG
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For example, on Debian or Ubuntu:
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./configure --libdir=/usr/local/lib/lua/5.1 --with-lua-includes=/usr/include/lua5.1 --with-lua-suffix=5.1 --with-lua-libraries=no
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Use
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---
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Make sure the library is installed on your LUA_CPATH, and require it.
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The library provides the constant bit.bits that gives the number of
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bits that can be used in bitwise operations, and the following
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functions:
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bit.cast(a) cast a to the internally-used integer type
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bit.bnot(a) returns the one's complement of a
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bit.band(w1, ...) returns the bitwise and of the w's
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bit.bor(w1, ...) returns the bitwise or of the w's
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bit.bxor(w1, ...) returns the bitwise exclusive or of the w's
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bit.lshift(a, b) returns a shifted left b places
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bit.rshift(a, b) returns a shifted logically right b places
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bit.arshift(a, b) returns a shifted arithmetically right b places
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All function arguments should be integers that fit into the C type
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lua_Integer.
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The logical operations start with "b" for "bit" to avoid clashing with
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reserved words; although "xor" isn't a reserved word, it seemed better
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to use "bxor" for consistency.
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