Attachment 920248 Details for Bug 1122595 – Source code for short program to demonstrate the problem

Source code for short program to demonstrate the problem

read_test.cpp (text/plain), 1.45 KB, created by Ross Miller on 2014-07-23 14:53:23 UTC

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Creator: Ross Miller

Created: 2014-07-23 14:53:23 UTC

Size: 1.45 KB

patch

obsolete

>// This is a quick test to try to narrow down a possible bug in
>// ifstream::readsome()
>
>#include <unistd.h> // for usleep()
>#include <fstream>
>#include <iostream>
>
>using namespace std;
>
>int main( int argc, char **argv)
>{   
>    if (argc != 2)
>    {
>        cerr << "Usage: " << argv[0] << " <test_file>" << endl;
>        return 1;
>    }
>    
>    ifstream infile( argv[1], ios_base::binary | ios_base::ate);
>    if (! infile.good())
>    {
>        cerr << "Failed to open " << argv[1] << endl;
>        return 2;
>    }
>    
>    const unsigned long fileSize = infile.tellg();
>    infile.seekg( 0, ios_base::beg);
>    
>    const unsigned bufLen = 1024 * 1024;  // 1MB reads
>    char *buf = new char[bufLen];
>
>    // readsome() doesn't set the eof bit, so manually calculate the eof 
>    unsigned long bytesRemaining = fileSize - infile.tellg();
>    while ( bytesRemaining)
>    {      
>        cout << "Bytes remaining: " << bytesRemaining << endl;
>        streamsize bytesRead = infile.readsome( buf, bufLen);
>        if (bytesRead == 0)
>        {
>            cerr << "Read 0 bytes from infile.  Position: " 
>                 << infile.tellg() << endl;
>            usleep(100 * 1000);  // Maybe it's a temporary fs glitch?
>        }
>        else
>        {
>            cout << "Read " << bytesRead << " bytes" << endl;
>        }
>        
>        bytesRemaining = fileSize - infile.tellg();
>    }
>    
>    cout << "Successfully read the file." << endl;  
>    delete[] buf;
>    return 0;
>}

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Attachments on bug 1122595: 920248