NetNews Usenet Archive 1992 #16/NN_1992_16.iso/spool/comp/lang/c/11508

Internet Message Format | 1992-07-22 | 1.8 KB

Path: sparky!uunet!mcsun!news.funet.fi!hydra!klaava!wirzeniu
From: [e-mail] (Lars Wirzenius)
Newsgroups: comp.lang.c
Subject: Re: Turbo C Overlays and getchar problems.
Message-ID: <[e-mail]>
Date: 23 Jul 92 08:40:38 GMT
References: <[e-mail]>
Organization: University of Helsinki
Lines: 30

[e-mail] (Larrie Simon Carr) writes:
>First problem was using getchar, getc, etc to read an ASCII 13.
>Why does this character get ignored?  I can transfer the file
>and the code to a Unix box and everything works fine.

You are probably reading a file in "text mode" instead of "binary mode".
Text mode means that the I/O library may convert the incoming bytes in
more or less any way it wishes so that what the program sees will be
as near as possible to the Unix model in which text files are ended with
a single '\n', i.e. not '\r' then '\n', as in MS-DOS.  In binary mode no
such translation occurs.  (This should be clearly explained in any
decent C book.)

>I am writing an application that I would like to have unload most
>of its self (all but main() and the overlay handler) before
>spawning to another application.

For this you don't need overlays, you need something that swaps your
whole application out while the other program runs.  Try using archie to
find spawno*.*, a library of routines by Ralph Brown (I think) that do
exactly that.  Some version can be found the comp.binaries.ibm.pc
archives.  Further discussion of spawning and swapping programs to disk
should be taken to comp.os.msdos.programmer, since they are not relevant
to comp.lang.c (so _edit_ your Newsgroups line!).

(Of course, a better solution is to switch operating systems, but if
you're stuck with DOS...)

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