From: "Pavlos" <trash24379 AT usa DOT net>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Bug in ftruncate or not?
Date: Sat, 31 Jul 1999 12:07:39 +0300
Organization: An OTEnet S.A. customer
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To: djgpp AT delorie DOT com
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Thank you for your answers, both of them fix the problem.
Pavlos


Davin McCall wrote in message
<37a15d60 DOT 24986840 AT newsserver DOT cc DOT monash DOT edu DOT au>...
>Inserting "fflush(f)" immediately after the "fwrite" line solves the
>problem. <SNIP>
>Davin.
>
fred smith wrote in message ...
>If you add:
>fseek (f, 0L, SEEK_CUR);
>immediately before the ftruncate it works fine.
>Fred


>On Thu, 29 Jul 1999 06:18:21 +0300, "Pavlos" <trash24379 AT usa DOT net>
>wrote:
>
>>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 --->
>>