RE: [suse-programming-e] looping through **environ?

25 Mar 2003

      The ADDRESS environ is represented by four bytes on your architecture. So
sizeof(environ)==4, which explains your observation of only four iterations
of the loop.

To loop through the environ variables correctly, you should use something
like
	for (i=0; environ[i]!=NULL; ++i) {...}

-----Original Message-----
From: Steven T. Hatton [mailto:hattons@globalsymmetry.com]
Sent: 25. mars 2003 09:59
To: suse-programming-e@suse.com
Subject: [suse-programming-e] looping through **environ?

Someone provided me this sample code getting the **environ variable from the

system and displaying it.  It doesn't seem to work correctly.  the body of 
the for-loop executes four times.  I believe there is far more data
available 
than that.  Am I correct in that assumption?  If so, why is this code not 
getting it all.  It's been ages since I wrote any C/C++, and I was never 
fluent in these languages.  I recall that working with pointers can be 
tricky.  By the example on 58 of Ellis & Stroustrup I am lead to believe the

code below should work.  Any suggestions?

#include 
#include 
#include "text_display.h"

extern char **environ;

unsigned int i;
QObject *label;
QString environString = "This is the process environment.\n";

int main( int argc, char ** argv )
{
    QApplication a( argc, argv );
    textDisplayWidget *w = new textDisplayWidget;
    label = w->child("TextLabel");
    for(i=0; i<(sizeof(environ)); i++)
    {
        environString.append("(QString)environ[i]");
        environString.append("\n");
    }
		((QLabel*)label)->setText(environString);
    w->show();
    a.connect( &a, SIGNAL( lastWindowClosed() ), &a, SLOT( quit() ) );
    return a.exec();
}

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RE: [suse-programming-e] looping through **environ?

Hallingstad Håkon