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From: x_larsen_b%use.uio.uninett@TOR.NTA.NO.UUCP
Newsgroups: comp.os.vms
Subject: Problem with fixed format files in VAX C.
Message-ID: <295:x_larsen_b@use.uio.uninett>
Date: Sat, 6-Jun-87 02:46:18 EDT
Article-I.D.: use.295:x_larsen_b
Posted: Sat Jun  6 02:46:18 1987
Date-Received: Sun, 7-Jun-87 03:17:59 EDT
Sender: daemon@ucbvax.BERKELEY.EDU
Distribution: world
Organization: The ARPA Internet
Lines: 49

I'm a bit confused at the moment.

I am trying to read/write 512 byte fixed format files
using VAX-11 C, and have the following problem:

If I execute the program below with '#define FIXED 0', I
get a file X.X containing the sequence "!**********".

That looks fine.

If I try with '#define FIXED 1', I get the output "*********!".

If somebody could give me a clue to what is going on, I would
appreciate it.

Btw: Yes, I AM aware of the fact that fseek should only be used with
values returned by ftell. But I don't think that is relevant in this
particular case.

+++++++++++++++++++++++++++++++++++++++

#define FIXED 1

#include stdio
main() {
FILE *f;
int idx;

#if FIXED
  f = fopen ("x.x", "w+", "mrs=512", "rfm=fix");
#else
  f = fopen ("x.x", "w+");
#endif

  for (idx=0; idx<10; idx++) fputc ('*', f);

  fseek (f, 0L, 0);
  fputc ('a', f);

};

+++++++++++++++++++++++++++++++++++++++
(I am running VAX C 2.1-007 and VMS 4.5.)

-----
Bjorn Larsen                 x_larsen_b%use.uio.uninett@tor.uio.no
Computing Centre             x_larsen_b@inger.arpa
University of Oslo           blarsen@ifi.uio.no
Norway