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SystemIO
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SUMMARY: NESTED | <A HREF="#field_summary">FIELD</A> | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD>
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mars.util</FONT>
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Class SystemIO</H2>
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<PRE>
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<A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</A>
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<IMG SRC="../../resources/inherit.gif" ALT="extended by "><B>mars.util.SystemIO</B>
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<DL>
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<DT><PRE>public class <B>SystemIO</B><DT>extends <A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A></DL>
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</PRE>
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<P>
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Provides standard i/o services needed to simulate the MIPS syscall
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routines. These methods will detect whether the simulator is being
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run from the command line or through the GUI, then do I/O to
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System.in and System.out in the former situation, and interact with
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the GUI in the latter.
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<P>
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<P>
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<DL>
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<DT><B>Author:</B></DT>
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<DD>Pete Sanderson and Ken Vollmar</DD>
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</DL>
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<HR>
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<P>
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<!-- =========== FIELD SUMMARY =========== -->
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<B>Field Summary</B></FONT></TH>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE>static <A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A></CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../mars/util/SystemIO.html#fileErrorString">fileErrorString</A></B></CODE>
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<BR>
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String used for description of file error</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE>static int</CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../mars/util/SystemIO.html#SYSCALL_BUFSIZE">SYSCALL_BUFSIZE</A></B></CODE>
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<BR>
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Buffer size for syscalls for file I/O</TD>
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</TR>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE>static int</CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../mars/util/SystemIO.html#SYSCALL_MAXFILES">SYSCALL_MAXFILES</A></B></CODE>
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<BR>
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Maximum number of files that can be open</TD>
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<!-- ======== CONSTRUCTOR SUMMARY ======== -->
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<B>Constructor Summary</B></FONT></TH>
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</TR>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<TD><CODE><B><A HREF="../../mars/util/SystemIO.html#SystemIO()">SystemIO</A></B>()</CODE>
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<BR>
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<!-- ========== METHOD SUMMARY =========== -->
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE>static void</CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../mars/util/SystemIO.html#closeFile(int)">closeFile</A></B>(int fd)</CODE>
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<BR>
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Close the file with specified file descriptor</TD>
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</TR>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE>static <A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A></CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../mars/util/SystemIO.html#getFileErrorMessage()">getFileErrorMessage</A></B>()</CODE>
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<BR>
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Retrieve file operation or error message</TD>
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</TR>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE>static int</CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../mars/util/SystemIO.html#openFile(java.lang.String, int)">openFile</A></B>(<A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A> filename,
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int flags)</CODE>
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<BR>
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Open a file for either reading or writing.</TD>
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</TR>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE>static void</CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../mars/util/SystemIO.html#printString(java.lang.String)">printString</A></B>(<A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A> string)</CODE>
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<BR>
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Implements syscall having 4 in $v0, to print a string.</TD>
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</TR>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE>static int</CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../mars/util/SystemIO.html#readChar(int)">readChar</A></B>(int serviceNumber)</CODE>
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<BR>
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Implements syscall having 12 in $v0, to read a char value.</TD>
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</TR>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE>static double</CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../mars/util/SystemIO.html#readDouble(int)">readDouble</A></B>(int serviceNumber)</CODE>
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<BR>
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Implements syscall to read a double value.</TD>
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</TR>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE>static float</CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../mars/util/SystemIO.html#readFloat(int)">readFloat</A></B>(int serviceNumber)</CODE>
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<BR>
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Implements syscall to read a float value.</TD>
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</TR>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE>static int</CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../mars/util/SystemIO.html#readFromFile(int, byte[], int)">readFromFile</A></B>(int fd,
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byte[] myBuffer,
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int lengthRequested)</CODE>
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<BR>
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Read bytes from file.</TD>
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</TR>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE>static int</CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../mars/util/SystemIO.html#readInteger(int)">readInteger</A></B>(int serviceNumber)</CODE>
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<BR>
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Implements syscall to read an integer value.</TD>
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</TR>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE>static <A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A></CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../mars/util/SystemIO.html#readString(int, int)">readString</A></B>(int serviceNumber,
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int maxLength)</CODE>
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<BR>
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Implements syscall to read a string.</TD>
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</TR>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE>static void</CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../mars/util/SystemIO.html#resetFiles()">resetFiles</A></B>()</CODE>
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<BR>
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Reset all files -- clears out the file descriptor table.</TD>
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</TR>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE>static int</CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../mars/util/SystemIO.html#writeToFile(int, byte[], int)">writeToFile</A></B>(int fd,
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byte[] myBuffer,
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int lengthRequested)</CODE>
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<BR>
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Write bytes to file.</TD>
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</TR>
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</TABLE>
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<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
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<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
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<TH ALIGN="left"><B>Methods inherited from class java.lang.<A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A></B></TH>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<TD><CODE><A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#clone()" title="class or interface in java.lang">clone</A>, <A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang">equals</A>, <A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang">finalize</A>, <A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang">getClass</A>, <A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang">hashCode</A>, <A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang">notify</A>, <A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang">notifyAll</A>, <A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#toString()" title="class or interface in java.lang">toString</A>, <A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang">wait</A>, <A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang">wait</A>, <A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#wait(long, int)" title="class or interface in java.lang">wait</A></CODE></TD>
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<!-- ============ FIELD DETAIL =========== -->
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</TABLE>
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<A NAME="SYSCALL_BUFSIZE"><!-- --></A><H3>
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SYSCALL_BUFSIZE</H3>
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<PRE>
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public static final int <B>SYSCALL_BUFSIZE</B></PRE>
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<DL>
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<DD>Buffer size for syscalls for file I/O
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<P>
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<DL>
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<DT><B>See Also:</B><DD><A HREF="../../constant-values.html#mars.util.SystemIO.SYSCALL_BUFSIZE">Constant Field Values</A></DL>
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</DL>
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<HR>
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<A NAME="SYSCALL_MAXFILES"><!-- --></A><H3>
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SYSCALL_MAXFILES</H3>
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<PRE>
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public static final int <B>SYSCALL_MAXFILES</B></PRE>
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<DL>
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<DD>Maximum number of files that can be open
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<P>
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<DL>
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<DT><B>See Also:</B><DD><A HREF="../../constant-values.html#mars.util.SystemIO.SYSCALL_MAXFILES">Constant Field Values</A></DL>
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</DL>
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<HR>
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<A NAME="fileErrorString"><!-- --></A><H3>
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fileErrorString</H3>
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<PRE>
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public static <A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A> <B>fileErrorString</B></PRE>
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<DL>
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<DD>String used for description of file error
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<P>
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<DL>
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</DL>
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</DL>
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<!-- ========= CONSTRUCTOR DETAIL ======== -->
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<A NAME="constructor_detail"><!-- --></A>
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<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
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<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
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<B>Constructor Detail</B></FONT></TH>
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</TR>
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</TABLE>
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<A NAME="SystemIO()"><!-- --></A><H3>
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SystemIO</H3>
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<PRE>
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public <B>SystemIO</B>()</PRE>
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<DL>
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</DL>
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<!-- ============ METHOD DETAIL ========== -->
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<A NAME="method_detail"><!-- --></A>
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<B>Method Detail</B></FONT></TH>
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<A NAME="readInteger(int)"><!-- --></A><H3>
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readInteger</H3>
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<PRE>
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public static int <B>readInteger</B>(int serviceNumber)</PRE>
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<DL>
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<DD>Implements syscall to read an integer value.
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Client is responsible for catching NumberFormatException.
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<P>
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<DD><DL>
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<DT><B>Parameters:</B><DD><CODE>serviceNumber</CODE> - the number assigned to Read Int syscall (default 5)
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<DT><B>Returns:</B><DD>int value corresponding to user input</DL>
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</DD>
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</DL>
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<HR>
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<A NAME="readFloat(int)"><!-- --></A><H3>
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|
readFloat</H3>
|
|
<PRE>
|
|
public static float <B>readFloat</B>(int serviceNumber)</PRE>
|
|
<DL>
|
|
<DD>Implements syscall to read a float value.
|
|
Client is responsible for catching NumberFormatException.
|
|
<P>
|
|
<DD><DL>
|
|
<DT><B>Parameters:</B><DD><CODE>serviceNumber</CODE> - the number assigned to Read Float syscall (default 6)
|
|
<DT><B>Returns:</B><DD>float value corresponding to user input
|
|
Feb 14 2005 Ken Vollmar</DL>
|
|
</DD>
|
|
</DL>
|
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<HR>
|
|
|
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<A NAME="readDouble(int)"><!-- --></A><H3>
|
|
readDouble</H3>
|
|
<PRE>
|
|
public static double <B>readDouble</B>(int serviceNumber)</PRE>
|
|
<DL>
|
|
<DD>Implements syscall to read a double value.
|
|
Client is responsible for catching NumberFormatException.
|
|
<P>
|
|
<DD><DL>
|
|
<DT><B>Parameters:</B><DD><CODE>serviceNumber</CODE> - the number assigned to Read Double syscall (default 7)
|
|
<DT><B>Returns:</B><DD>double value corresponding to user input
|
|
1 Aug 2005 DPS, based on Ken Vollmar's readFloat</DL>
|
|
</DD>
|
|
</DL>
|
|
<HR>
|
|
|
|
<A NAME="printString(java.lang.String)"><!-- --></A><H3>
|
|
printString</H3>
|
|
<PRE>
|
|
public static void <B>printString</B>(<A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A> string)</PRE>
|
|
<DL>
|
|
<DD>Implements syscall having 4 in $v0, to print a string.
|
|
<P>
|
|
<DD><DL>
|
|
</DL>
|
|
</DD>
|
|
</DL>
|
|
<HR>
|
|
|
|
<A NAME="readString(int, int)"><!-- --></A><H3>
|
|
readString</H3>
|
|
<PRE>
|
|
public static <A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A> <B>readString</B>(int serviceNumber,
|
|
int maxLength)</PRE>
|
|
<DL>
|
|
<DD>Implements syscall to read a string.
|
|
<P>
|
|
<DD><DL>
|
|
<DT><B>Parameters:</B><DD><CODE>serviceNumber</CODE> - the number assigned to Read String syscall (default 8)<DD><CODE>maxLength</CODE> - the maximum string length
|
|
<DT><B>Returns:</B><DD>the entered string, truncated to maximum length if necessary</DL>
|
|
</DD>
|
|
</DL>
|
|
<HR>
|
|
|
|
<A NAME="readChar(int)"><!-- --></A><H3>
|
|
readChar</H3>
|
|
<PRE>
|
|
public static int <B>readChar</B>(int serviceNumber)</PRE>
|
|
<DL>
|
|
<DD>Implements syscall having 12 in $v0, to read a char value.
|
|
<P>
|
|
<DD><DL>
|
|
<DT><B>Parameters:</B><DD><CODE>serviceNumber</CODE> - the number assigned to Read Char syscall (default 12)
|
|
<DT><B>Returns:</B><DD>int value with lowest byte corresponding to user input</DL>
|
|
</DD>
|
|
</DL>
|
|
<HR>
|
|
|
|
<A NAME="writeToFile(int, byte[], int)"><!-- --></A><H3>
|
|
writeToFile</H3>
|
|
<PRE>
|
|
public static int <B>writeToFile</B>(int fd,
|
|
byte[] myBuffer,
|
|
int lengthRequested)</PRE>
|
|
<DL>
|
|
<DD>Write bytes to file.
|
|
<P>
|
|
<DD><DL>
|
|
<DT><B>Parameters:</B><DD><CODE>fd</CODE> - file descriptor<DD><CODE>myBuffer</CODE> - byte array containing characters to write<DD><CODE>lengthRequested</CODE> - number of bytes to write
|
|
<DT><B>Returns:</B><DD>number of bytes written, or -1 on error</DL>
|
|
</DD>
|
|
</DL>
|
|
<HR>
|
|
|
|
<A NAME="readFromFile(int, byte[], int)"><!-- --></A><H3>
|
|
readFromFile</H3>
|
|
<PRE>
|
|
public static int <B>readFromFile</B>(int fd,
|
|
byte[] myBuffer,
|
|
int lengthRequested)</PRE>
|
|
<DL>
|
|
<DD>Read bytes from file.
|
|
<P>
|
|
<DD><DL>
|
|
<DT><B>Parameters:</B><DD><CODE>fd</CODE> - file descriptor<DD><CODE>myBuffer</CODE> - byte array to contain bytes read<DD><CODE>lengthRequested</CODE> - number of bytes to read
|
|
<DT><B>Returns:</B><DD>number of bytes read, 0 on EOF, or -1 on error</DL>
|
|
</DD>
|
|
</DL>
|
|
<HR>
|
|
|
|
<A NAME="openFile(java.lang.String, int)"><!-- --></A><H3>
|
|
openFile</H3>
|
|
<PRE>
|
|
public static int <B>openFile</B>(<A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A> filename,
|
|
int flags)</PRE>
|
|
<DL>
|
|
<DD>Open a file for either reading or writing. Note that read/write flag is NOT
|
|
IMPLEMENTED. Also note that file permission modes are also NOT IMPLEMENTED.
|
|
<P>
|
|
<DD><DL>
|
|
<DT><B>Parameters:</B><DD><CODE>filename</CODE> - string containing filename<DD><CODE>flag</CODE> - 0 for read, 1 for write
|
|
<DT><B>Returns:</B><DD>file descriptor in the range 0 to SYSCALL_MAXFILES-1, or -1 if error</DL>
|
|
</DD>
|
|
</DL>
|
|
<HR>
|
|
|
|
<A NAME="closeFile(int)"><!-- --></A><H3>
|
|
closeFile</H3>
|
|
<PRE>
|
|
public static void <B>closeFile</B>(int fd)</PRE>
|
|
<DL>
|
|
<DD>Close the file with specified file descriptor
|
|
<P>
|
|
<DD><DL>
|
|
<DT><B>Parameters:</B><DD><CODE>fd</CODE> - the file descriptor of an open file</DL>
|
|
</DD>
|
|
</DL>
|
|
<HR>
|
|
|
|
<A NAME="resetFiles()"><!-- --></A><H3>
|
|
resetFiles</H3>
|
|
<PRE>
|
|
public static void <B>resetFiles</B>()</PRE>
|
|
<DL>
|
|
<DD>Reset all files -- clears out the file descriptor table.
|
|
<P>
|
|
<DD><DL>
|
|
</DL>
|
|
</DD>
|
|
</DL>
|
|
<HR>
|
|
|
|
<A NAME="getFileErrorMessage()"><!-- --></A><H3>
|
|
getFileErrorMessage</H3>
|
|
<PRE>
|
|
public static <A HREF="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A> <B>getFileErrorMessage</B>()</PRE>
|
|
<DL>
|
|
<DD>Retrieve file operation or error message
|
|
<P>
|
|
<DD><DL>
|
|
|
|
<DT><B>Returns:</B><DD>string containing message</DL>
|
|
</DD>
|
|
</DL>
|
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