mirror of
https://github.com/holub/mame
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b5475eb38b
Compile Lua as C++. When Lua is compiled as C, it uses setjmp/longjmp for error handling, resulting in failure to unwind intermediate stack frames. Trying to ensure no objects with non-trivial destructors are in scope when raising a Lua error is error-prone. In particular, converting an exception to a Lua error becomes convoluted, and raising a Lua error from a constructor is effectively impossible. Updated Lua to 5.4.4 - this includes a brand-new garbage collector implementation with better performance. The main thing removed is the deprecated bitlib. Updated sol2 to version 3.3.0 - this adds support for Lua 5.4 and fixes a number of issues, including not correctly handling errors when Lua is built as C++. Updated LuaFileSystem to version 1.8.0 - this adds support for symbolic links on Windows, as well as Lua 5.4 compatibility. Updated LuaSQLite3 to version 0.9.5 - this fixes issues in multi-threaded environments, as well as Lua 5.4 compatibility. Fixed double-free after attempting to construct a debugger expression from Lua with an invalid string, and exposed expression error to Lua in a better way. Added warning level print function to Lua. Fixed saving cheats with shift operators in expressions, although this code isn't actually used as there's no cheat editor.
287 lines
13 KiB
HTML
287 lines
13 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
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<head>
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<title>LuaFileSystem</title>
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<link rel="stylesheet" href="doc.css" type="text/css"/>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
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<body>
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<div id="container">
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<div id="product">
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<div id="product_logo">
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<a href="http://keplerproject.github.io/luafilesystem">
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<img alt="LuaFileSystem" src="luafilesystem.png"/>
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</a>
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</div>
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<div id="product_name"><big><strong>LuaFileSystem</strong></big></div>
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<div id="product_description">File System Library for the Lua Programming Language</div>
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</div> <!-- id="product" -->
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<div id="main">
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<div id="navigation">
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<h1>LuaFileSystem</h1>
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<ul>
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<li><a href="index.html">Home</a>
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<ul>
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<li><a href="index.html#overview">Overview</a></li>
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<li><a href="index.html#status">Status</a></li>
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<li><a href="index.html#download">Download</a></li>
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<li><a href="index.html#history">History</a></li>
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<li><a href="index.html#credits">Credits</a></li>
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</ul>
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</li>
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<li><strong>Manual</strong>
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<ul>
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<li><a href="manual.html#introduction">Introduction</a></li>
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<li><a href="manual.html#building">Building</a></li>
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<li><a href="manual.html#installation">Installation</a></li>
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<li><a href="manual.html#reference">Reference</a></li>
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</ul>
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</li>
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<li><a href="examples.html">Examples</a></li>
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<li><a href="https://github.com/keplerproject/luafilesystem">Project</a>
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<ul>
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<li><a href="https://github.com/keplerproject/luafilesystem/issues">Bug Tracker</a></li>
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<li><a href="https://github.com/keplerproject/luafilesystem">Git</a></li>
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</ul>
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</li>
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<li><a href="license.html">License</a></li>
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</ul>
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</div> <!-- id="navigation" -->
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<div id="content">
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<h2><a name="introduction"></a>Introduction</h2>
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<p>LuaFileSystem is a <a href="http://www.lua.org">Lua</a> library
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developed to complement the set of functions related to file
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systems offered by the standard Lua distribution.</p>
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<p>LuaFileSystem offers a portable way to access
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the underlying directory structure and file attributes.</p>
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<h2><a name="building"></a>Building</h2>
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<p>
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LuaFileSystem should be built with Lua 5.1 so the language library
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and header files for the target version must be installed properly.
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</p>
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<p>
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LuaFileSystem offers a Makefile and a separate configuration file,
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<code>config</code>,
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which should be edited to suit your installation before running
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<code>make</code>.
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The file has some definitions like paths to the external libraries,
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compiler options and the like.
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</p>
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<p>On Windows, the C runtime used to compile LuaFileSystem must be the same
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runtime that Lua uses, or some LuaFileSystem functions will not work.</p>
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<h2><a name="installation"></a>Installation</h2>
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<p>The easiest way to install LuaFileSystem is to use LuaRocks:</p>
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<pre class="example">
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luarocks install luafilesystem
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</pre>
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<p>If you prefer to install LuaFileSystem manually, the compiled binary should be copied to a directory in your
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<a href="http://www.lua.org/manual/5.1/manual.html#pdf-package.cpath">C path</a>.</p>
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<h2><a name="reference"></a>Reference</h2>
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<p>
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LuaFileSystem offers the following functions:
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</p>
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<dl class="reference">
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<dt><a name="attributes"></a><strong><code>lfs.attributes (filepath [, request_name | result_table])</code></strong></dt>
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<dd>Returns a table with the file attributes corresponding to
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<code>filepath</code> (or <code>nil</code> followed by an error message and a system-dependent error code
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in case of error).
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If the second optional argument is given and is a string, then only the value of the
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named attribute is returned (this use is equivalent to
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<code>lfs.attributes(filepath)[request_name]</code>, but the table is not created
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and only one attribute is retrieved from the O.S.).
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if a table is passed as the second argument, it (<code>result_table</code>) is filled with attributes and returned instead of a new table.
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The attributes are described as follows;
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attribute <code>mode</code> is a string, all the others are numbers,
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and the time related attributes use the same time reference of
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<a href="http://www.lua.org/manual/5.1/manual.html#pdf-os.time"><code>os.time</code></a>:
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<dl>
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<dt><strong><code>dev</code></strong></dt>
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<dd>on Unix systems, this represents the device that the inode resides on. On Windows systems,
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represents the drive number of the disk containing the file</dd>
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<dt><strong><code>ino</code></strong></dt>
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<dd>on Unix systems, this represents the inode number. On Windows systems this has no meaning</dd>
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<dt><strong><code>mode</code></strong></dt>
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<dd>string representing the associated protection mode (the values could be
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<code>file</code>, <code>directory</code>, <code>link</code>, <code>socket</code>,
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<code>named pipe</code>, <code>char device</code>, <code>block device</code> or
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<code>other</code>)</dd>
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<dt><strong><code>nlink</code></strong></dt>
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<dd>number of hard links to the file</dd>
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<dt><strong><code>uid</code></strong></dt>
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<dd>user-id of owner (Unix only, always 0 on Windows)</dd>
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<dt><strong><code>gid</code></strong></dt>
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<dd>group-id of owner (Unix only, always 0 on Windows)</dd>
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<dt><strong><code>rdev</code></strong></dt>
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<dd>on Unix systems, represents the device type, for special file inodes.
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On Windows systems represents the same as <code>dev</code></dd>
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<dt><strong><code>access</code></strong></dt>
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<dd>time of last access</dd>
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<dt><strong><code>modification</code></strong></dt>
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<dd>time of last data modification</dd>
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<dt><strong><code>change</code></strong></dt>
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<dd>time of last file status change</dd>
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<dt><strong><code>size</code></strong></dt>
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<dd>file size, in bytes</dd>
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<dt><strong><code>permissions</code></strong></dt>
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<dd>file permissions string</dd>
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<dt><strong><code>blocks</code></strong></dt>
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<dd>block allocated for file; (Unix only)</dd>
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<dt><strong><code>blksize</code></strong></dt>
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<dd>optimal file system I/O blocksize; (Unix only)</dd>
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</dl>
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This function uses <code>stat</code> internally thus if the given
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<code>filepath</code> is a symbolic link, it is followed (if it points to
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another link the chain is followed recursively) and the information
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is about the file it refers to.
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To obtain information about the link itself, see function
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<a href="#symlinkattributes">lfs.symlinkattributes</a>.
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</dd>
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<dt><a name="chdir"></a><strong><code>lfs.chdir (path)</code></strong></dt>
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<dd>Changes the current working directory to the given
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<code>path</code>.<br />
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Returns <code>true</code> in case of success or <code>nil</code> plus an
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error string.</dd>
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<dt><a name="lock_dir"></a><strong><code>lfs.lock_dir(path, [seconds_stale])</code></strong></dt>
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<dd>Creates a lockfile (called lockfile.lfs) in <code>path</code> if it does not
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exist and returns the lock. If the lock already exists checks if
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it's stale, using the second parameter (default for the second
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parameter is <code>INT_MAX</code>, which in practice means the lock will never
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be stale. To free the the lock call <code>lock:free()</code>. <br/>
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In case of any errors it returns nil and the error message. In
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particular, if the lock exists and is not stale it returns the
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"File exists" message.</dd>
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<dt><a name="currentdir"></a><strong><code>lfs.currentdir ()</code></strong></dt>
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<dd>Returns a string with the current working directory or <code>nil</code>
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plus an error string.</dd>
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<dt><a name="dir"></a><strong><code>iter, dir_obj = lfs.dir (path)</code></strong></dt>
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<dd>
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Lua iterator over the entries of a given directory.
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Each time the iterator is called with <code>dir_obj</code> it returns a directory entry's name as a string, or
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<code>nil</code> if there are no more entries. You can also iterate by calling <code>dir_obj:next()</code>, and
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explicitly close the directory before the iteration finished with <code>dir_obj:close()</code>.
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Raises an error if <code>path</code> is not a directory.
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</dd>
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<dt><a name="lock"></a><strong><code>lfs.lock (filehandle, mode[, start[, length]])</code></strong></dt>
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<dd>Locks a file or a part of it. This function works on <em>open files</em>; the
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file handle should be specified as the first argument.
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The string <code>mode</code> could be either
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<code>r</code> (for a read/shared lock) or <code>w</code> (for a
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write/exclusive lock). The optional arguments <code>start</code>
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and <code>length</code> can be used to specify a starting point and
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its length; both should be numbers.<br />
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Returns <code>true</code> if the operation was successful; in
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case of error, it returns <code>nil</code> plus an error string.
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</dd>
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<dt><a name="link"></a><strong><code>lfs.link (old, new[, symlink])</code></strong></dt>
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<dd>Creates a link. The first argument is the object to link to
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and the second is the name of the link. If the optional third
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argument is true, the link will by a symbolic link (by default, a
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hard link is created).
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</dd>
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<dt><a name="mkdir"></a><strong><code>lfs.mkdir (dirname)</code></strong></dt>
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<dd>Creates a new directory. The argument is the name of the new
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directory.<br />
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Returns <code>true</code> in case of success or <code>nil</code>, an error message and
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a system-dependent error code in case of error.
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</dd>
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<dt><a name="rmdir"></a><strong><code>lfs.rmdir (dirname)</code></strong></dt>
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<dd>Removes an existing directory. The argument is the name of the directory.<br />
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Returns <code>true</code> in case of success or <code>nil</code>, an error message and
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a system-dependent error code in case of error.
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<dt><a name="setmode"></a><strong><code>lfs.setmode (file, mode)</code></strong></dt>
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<dd>Sets the writing mode for a file. The mode string can be either <code>"binary"</code> or <code>"text"</code>.
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Returns <code>true</code> followed the previous mode string for the file, or
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<code>nil</code> followed by an error string in case of errors.
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On non-Windows platforms, where the two modes are identical,
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setting the mode has no effect, and the mode is always returned as <code>binary</code>.
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</dd>
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<dt><a name="symlinkattributes"></a><strong><code>lfs.symlinkattributes (filepath [, request_name])</code></strong></dt>
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<dd>Identical to <a href="#attributes">lfs.attributes</a> except that
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it obtains information about the link itself (not the file it refers to).
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It also adds a <strong><code>target</code></strong> field, containing
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the file name that the symlink points to.
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On Windows this function does not yet support links, and is identical to
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<code>lfs.attributes</code>.
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</dd>
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<dt><a name="touch"></a><strong><code>lfs.touch (filepath [, atime [, mtime]])</code></strong></dt>
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<dd>Set access and modification times of a file. This function is
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a bind to <code>utime</code> function. The first argument is the
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filename, the second argument (<code>atime</code>) is the access time,
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and the third argument (<code>mtime</code>) is the modification time.
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Both times are provided in seconds (which should be generated with
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Lua standard function <code>os.time</code>).
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If the modification time is omitted, the access time provided is used;
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if both times are omitted, the current time is used.<br />
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Returns <code>true</code> in case of success or <code>nil</code>, an error message and
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a system-dependent error code in case of error.
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</dd>
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<dt><a name="unlock"></a><strong><code>lfs.unlock (filehandle[, start[, length]])</code></strong></dt>
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<dd>Unlocks a file or a part of it. This function works on
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<em>open files</em>; the file handle should be specified as the first
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argument. The optional arguments <code>start</code> and
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<code>length</code> can be used to specify a starting point and its
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length; both should be numbers.<br />
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Returns <code>true</code> if the operation was successful;
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in case of error, it returns <code>nil</code> plus an error string.
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</dd>
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</dl>
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