From: "Pavlos" <trash24379 AT usa DOT net>
Newsgroups: comp.os.msdos.djgpp
Subject: Bug in ftruncate or not?
Date: Thu, 29 Jul 1999 06:18:21 +0300
Organization: An OTEnet S.A. customer
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To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Reply-To: djgpp AT delorie DOT com

Hello,
I know that most of 'bug' reports are actually a fault of the user... Do I
do something wrong here?

This simple program will truncate the file only if you comment out #define
BUGGY.
At least in my PC...
If you don't comment #define BUGGY, it won't truncate the file.
Here is the code.
When you run it, press '1' the first time to create the file. Then run it
again and press '2' to truncate it.
Thank you.

Pavlos

<--- cut here --->

#include <stdio.h>
#include <stdlib.h>

#define BUGGY

int main(int argc, char **argv)
{
   FILE *f;
   char buf[1000];

   printf("1: Create file (1000 bytes), 2:Truncate file (to 500)\n");
   printf("Your choice: ");

   switch(getch())
   {
      case  '1':
         f = fopen("TEST1234.$$$", "wb+");
         fwrite(buf, 1000, 1, f);
         return(0);

      case  '2':
         f = fopen("TEST1234.$$$", "rb+");
         fread(buf, 1000, 1, f);
         #ifdef BUGGY
         fseek(f, 500, SEEK_SET);
         fwrite(buf, 500, 1, f);
         #endif
         ftruncate(fileno(f), 500);
         return(0);

      default:
         return(0);
   }
}

<--- cut here --->