Databases
StackOverflow2013
Postsdbo
POsegmentation fault at end of the program
Body
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POsegmentation fault at end of the program
    text
    copied!<p>I've got a bit problem. My program throws segmentation fault when returning zero in main.</p> <p>The main function looks like this:</p> <pre><code>int main(int argc, char* argv[]){ ifstream fs("test.dat", ios::binary); cSendStream sendstr(&amp;fs,20); char *zomg=sendstr.data(); //zomg[20]=0; sendstr.read(20); cout&lt;&lt;"Buffer: "&lt;&lt;sendstr.data()&lt;&lt;endl; cout&lt;&lt;"Remaining: "&lt;&lt;sendstr.dataAvailable()&lt;&lt;endl; sendstr.read(2); cout&lt;&lt;"Buffer: "&lt;&lt;zomg&lt;&lt;endl; cout&lt;&lt;"Remaining: "&lt;&lt;sendstr.dataAvailable()&lt;&lt;endl; sendstr.read(10); cout&lt;&lt;"Buffer: "&lt;&lt;zomg&lt;&lt;endl; cout&lt;&lt;"Remaining: "&lt;&lt;sendstr.dataAvailable()&lt;&lt;endl; cout&lt;&lt;"end..."&lt;&lt;endl; return 0; } </code></pre> <p>The commented <code>zomg</code> part is the point which makes the program crash. <code>zomg</code> is pointing on <code>char[20]</code>. My point on that line is to set the end of the array because somehow if I don't do that the stream reads more data than 20 bytes, but it prints just one unnecessary symbol though.</p> <p>Funny thing is that even if I write there some additional code between this and return 0 it throws fault first when returning.</p> <p>Just for the case you wanted to see the cSendStream class:</p> <p>cSendStream.h:</p> <pre><code>class cSendStream{ public: cSendStream(std::istream*, int streamsize); int read(int); int dataAvailable(); char* data(); private: void shift(int); std::istream *source; int streamsize; char* buffer; }; </code></pre> <p>and the cSendStream.cpp:</p> <pre><code>#include "cSendStream.h" cSendStream::cSendStream(std::istream *src, int size){ source=src; streamsize=size; buffer=new char[streamsize]; memset(buffer,0,streamsize); } int cSendStream::read(int i){ if(dataAvailable()&lt;1 || i&lt;=0){ return 0; } if(i&gt;dataAvailable()){ i=dataAvailable()-1; } if(i&gt;streamsize){ i=streamsize; } shift(i); source-&gt;read(&amp;(buffer[streamsize-i]),i); return i; } int cSendStream::dataAvailable(){ int current=source-&gt;tellg(); source-&gt;seekg (0, std::ios::end); int available = (int)(source-&gt;tellg())-current; source-&gt;seekg (current); return available; } char* cSendStream::data(){ return buffer; } void cSendStream::shift(int i){ char tmp[2048]; memcpy(tmp,buffer,streamsize); memcpy(&amp;(buffer[0]),&amp;(tmp[i]),streamsize-i); } </code></pre>
 

Querying!

 
Guidance
An individual column

Larger individual text columns get their own page to allow for proper reading.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload