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ibcm-parse.cpp.html
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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
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<pre><tt><i><font color="#9A1900">/* A program that will quickly check if the file names passed in via</font></i>
<i><font color="#9A1900"> * command line arguments look like IBCM files. In particular, it</font></i>
<i><font color="#9A1900"> * checks if the first four digits on each line are all hexadecimal</font></i>
<i><font color="#9A1900"> * digits. It does not program validity checking beyond this. It is</font></i>
<i><font color="#9A1900"> * useful to tell the students if, on submission, their programs will</font></i>
<i><font color="#9A1900"> * parse correctly in an IBCM simulator.</font></i>
<i><font color="#9A1900"> */</font></i>
<b><font color="#000080">#include</font></b> <font color="#FF0000"><iostream></font>
<b><font color="#000080">#include</font></b> <font color="#FF0000"><fstream></font>
<b><font color="#000080">#include</font></b> <font color="#FF0000"><stdlib.h></font>
<b><font color="#000080">#include</font></b> <font color="#FF0000"><ctype.h></font>
<b><font color="#000080">#include</font></b> <font color="#FF0000"><string.h></font>
<b><font color="#0000FF">using</font></b> <b><font color="#0000FF">namespace</font></b> std<font color="#990000">;</font>
<font color="#009900">int</font> <b><font color="#000000">main</font></b> <font color="#990000">(</font><font color="#009900">int</font> argc<font color="#990000">,</font> <font color="#009900">char</font> <font color="#990000">*</font>argv<font color="#990000">[])</font> <font color="#FF0000">{</font>
<font color="#008080">string</font> line<font color="#990000">;</font>
<font color="#009900">int</font> linenum <font color="#990000">=</font> <font color="#993399">0</font><font color="#990000">;</font>
<font color="#009900">bool</font> allowComments <font color="#990000">=</font> <b><font color="#0000FF">false</font></b><font color="#990000">;</font>
<i><font color="#9A1900">// make sure they gave some command-line parameters</font></i>
<b><font color="#0000FF">if</font></b> <font color="#990000">(</font> argc <font color="#990000">==</font> <font color="#993399">1</font> <font color="#990000">)</font> <font color="#FF0000">{</font>
cout <font color="#990000"><<</font> argv<font color="#990000">[</font><font color="#993399">0</font><font color="#990000">]</font> <font color="#990000"><<</font> <font color="#FF0000">": no input files"</font> <font color="#990000"><<</font> endl<font color="#990000">;</font>
<b><font color="#000000">exit</font></b><font color="#990000">(</font><font color="#993399">1</font><font color="#990000">);</font>
<font color="#FF0000">}</font>
<b><font color="#0000FF">for</font></b> <font color="#990000">(</font> <font color="#009900">int</font> i <font color="#990000">=</font> <font color="#993399">1</font><font color="#990000">;</font> i <font color="#990000"><</font> argc<font color="#990000">;</font> i<font color="#990000">++</font> <font color="#990000">)</font> <font color="#FF0000">{</font>
<i><font color="#9A1900">// a comment has a '//' as the first two characters on a line</font></i>
<b><font color="#0000FF">if</font></b> <font color="#990000">(</font> <font color="#990000">!</font><b><font color="#000000">strcmp</font></b><font color="#990000">(</font>argv<font color="#990000">[</font>i<font color="#990000">],</font><font color="#FF0000">"-allowcomments"</font><font color="#990000">)</font> <font color="#990000">)</font> <font color="#FF0000">{</font>
allowComments <font color="#990000">=</font> <b><font color="#0000FF">true</font></b><font color="#990000">;</font>
<b><font color="#0000FF">continue</font></b><font color="#990000">;</font>
<font color="#FF0000">}</font>
<i><font color="#9A1900">// open the file</font></i>
<font color="#008080">ifstream</font> <b><font color="#000000">file</font></b><font color="#990000">(</font>argv<font color="#990000">[</font>i<font color="#990000">]);</font>
<b><font color="#0000FF">if</font></b> <font color="#990000">(</font> <font color="#990000">!</font>file<font color="#990000">.</font><b><font color="#000000">is_open</font></b><font color="#990000">()</font> <font color="#990000">)</font> <font color="#FF0000">{</font>
cout <font color="#990000"><<</font> argv<font color="#990000">[</font><font color="#993399">0</font><font color="#990000">]</font> <font color="#990000"><<</font> <font color="#FF0000">": "</font> <font color="#990000"><<</font> argv<font color="#990000">[</font>i<font color="#990000">]</font> <font color="#990000"><<</font> <font color="#FF0000">": no such file"</font> <font color="#990000"><<</font> endl<font color="#990000">;</font>
<b><font color="#000000">exit</font></b><font color="#990000">(</font><font color="#993399">2</font><font color="#990000">);</font>
<font color="#FF0000">}</font>
<i><font color="#9A1900">// read in the entire file...</font></i>
<b><font color="#0000FF">while</font></b> <font color="#990000">(</font> file<font color="#990000">.</font><b><font color="#000000">good</font></b><font color="#990000">()</font> <font color="#990000">)</font> <font color="#FF0000">{</font>
<i><font color="#9A1900">// read in a line from the file</font></i>
<b><font color="#000000">getline</font></b> <font color="#990000">(</font>file<font color="#990000">,</font> line<font color="#990000">);</font>
linenum<font color="#990000">++;</font>
<i><font color="#9A1900">// is it the last line of the file?</font></i>
<b><font color="#0000FF">if</font></b> <font color="#990000">(</font> <font color="#990000">(</font>line<font color="#990000">.</font><b><font color="#000000">size</font></b><font color="#990000">()</font> <font color="#990000">==</font> <font color="#993399">0</font><font color="#990000">)</font> <font color="#990000">&&</font> <font color="#990000">(!</font>file<font color="#990000">.</font><b><font color="#000000">good</font></b><font color="#990000">())</font> <font color="#990000">)</font>
<b><font color="#0000FF">break</font></b><font color="#990000">;</font>
<i><font color="#9A1900">// is it a comment?</font></i>
<b><font color="#0000FF">if</font></b> <font color="#990000">(</font> allowComments <font color="#990000">&&</font> <font color="#990000">(</font>line<font color="#990000">.</font><b><font color="#000000">size</font></b><font color="#990000">()</font> <font color="#990000">>=</font> <font color="#993399">2</font><font color="#990000">)</font> <font color="#990000">&&</font>
<font color="#990000">(</font>line<font color="#990000">[</font><font color="#993399">0</font><font color="#990000">]</font> <font color="#990000">==</font> <font color="#FF0000">'/'</font><font color="#990000">)</font> <font color="#990000">&&</font> <font color="#990000">(</font>line<font color="#990000">[</font><font color="#993399">1</font><font color="#990000">]</font> <font color="#990000">==</font> <font color="#FF0000">'/'</font><font color="#990000">)</font> <font color="#990000">)</font>
<b><font color="#0000FF">continue</font></b><font color="#990000">;</font>
<i><font color="#9A1900">// is the line too short?</font></i>
<b><font color="#0000FF">if</font></b> <font color="#990000">(</font> line<font color="#990000">.</font><b><font color="#000000">size</font></b><font color="#990000">()</font> <font color="#990000"><</font> <font color="#993399">4</font> <font color="#990000">)</font> <font color="#FF0000">{</font>
cout <font color="#990000"><<</font> argv<font color="#990000">[</font><font color="#993399">0</font><font color="#990000">]</font> <font color="#990000"><<</font> <font color="#FF0000">": "</font> <font color="#990000"><<</font> argv<font color="#990000">[</font>i<font color="#990000">]</font> <font color="#990000"><<</font> <font color="#FF0000">" has too short a line on line number "</font> <font color="#990000"><<</font> linenum <font color="#990000"><<</font> <font color="#FF0000">"("</font> <font color="#990000"><<</font> line<font color="#990000">.</font><b><font color="#000000">size</font></b><font color="#990000">()</font> <font color="#990000"><<</font> <font color="#FF0000">")"</font> <font color="#990000"><<</font> endl<font color="#990000">;</font>
<b><font color="#000000">exit</font></b><font color="#990000">(</font><font color="#993399">3</font><font color="#990000">);</font>
<font color="#FF0000">}</font>
<i><font color="#9A1900">// are the first four digits hex characters?</font></i>
<b><font color="#0000FF">for</font></b> <font color="#990000">(</font> <font color="#009900">int</font> j <font color="#990000">=</font> <font color="#993399">0</font><font color="#990000">;</font> j <font color="#990000"><</font> <font color="#993399">4</font><font color="#990000">;</font> j<font color="#990000">++</font> <font color="#990000">)</font>
<b><font color="#0000FF">if</font></b> <font color="#990000">(</font> <font color="#990000">!</font><b><font color="#000000">isxdigit</font></b><font color="#990000">(</font>line<font color="#990000">[</font>j<font color="#990000">])</font> <font color="#990000">)</font> <font color="#FF0000">{</font>
cout <font color="#990000"><<</font> argv<font color="#990000">[</font><font color="#993399">0</font><font color="#990000">]</font> <font color="#990000"><<</font> <font color="#FF0000">": "</font> <font color="#990000"><<</font> argv<font color="#990000">[</font>i<font color="#990000">]</font> <font color="#990000"><<</font> <font color="#FF0000">" invalid hexadecimal digit on line "</font> <font color="#990000"><<</font> linenum <font color="#990000"><<</font> <font color="#FF0000">" character "</font> <font color="#990000"><<</font> <font color="#990000">(</font>j<font color="#990000">+</font><font color="#993399">1</font><font color="#990000">)</font> <font color="#990000"><<</font> endl<font color="#990000">;</font>
<b><font color="#000000">exit</font></b><font color="#990000">(</font><font color="#993399">3</font><font color="#990000">);</font>
<font color="#FF0000">}</font>
<font color="#FF0000">}</font>
<i><font color="#9A1900">// all done with this file!</font></i>
file<font color="#990000">.</font><b><font color="#000000">close</font></b><font color="#990000">();</font>
<font color="#FF0000">}</font>
<b><font color="#0000FF">return</font></b> <font color="#993399">0</font><font color="#990000">;</font>
<font color="#FF0000">}</font>
</tt></pre>
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