Sender: salvador AT delorie DOT com
Message-ID: <3BB47CE0.106BF5AF@inti.gov.ar>
Date: Fri, 28 Sep 2001 10:36:32 -0300
From: salvador <salvador AT inti DOT gov DOT ar>
Organization: INTI
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To: djgpp-workers AT delorie DOT com
Subject: GCC 3.01 Streams problem
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Reply-To: djgpp-workers AT delorie DOT com

Hi All!

  GCC 3.0 changed too much things in the C++ classes to follow the new
standard (is that ISO C++ 1998?).
  I was "fighting" to support it in the TV library. Thanks to Andris and
other
people I got the library compiled. But while testing the examples I found
a really strange behavior.
  I don't know if that is a bug and in this case if that's djgpp specific.
So I need help from somebody with:

a) Access to another systems with gcc 3.x (not djgpp)
b) Knowledge about the new streams.

  It looks like a bug and as it is for lines that only contains EOL (\r\n)
could
be related to djgpp's \r\n to \n traslation. The following code compiled
with
gcc 2.95.x can read a complete file name meassuring the length of each
line. The same code compiled with 3.0.1 will stop reading in the first empty

line and from this point will enter in an endless loop. Note that EOF is not

reached nor indicated with gcc 3.

Here is the stripped code (the original loads the text in memory):

#include <fstream.h>

const int maxLineLength=200;

int main(void)
{
 ifstream fileToView("test.txt");
 char line[maxLineLength+1];
 int len=0;
 while(!fileToView.eof())
   {
    fileToView.get(line, sizeof line);
    char c;
    fileToView.get(c);      // grab trailing newline
    printf("%d (%d)\n",strlen(line),c);
    // Sanity stop
    if (++len==20) return 1;
   }
 printf("EOF: %d\n",fileToView.eof());
 return 0;
}

Here is what you can use for `test.txt' to feed the example:

<--------
First Line
Another Line

The above is empty

<---------

Output from gcc 2.95.x compiled code:

10 (10)
12 (10)
0 (10)
18 (10)
0 (10)
EOF: 1

Output from gcc 3.0.1 compiled code:

10 (10)
12 (10)
0 (10)
0 (10)
....

SET

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Salvador Eduardo Tropea (SET). (Electronics Engineer)
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