Path: utzoo!mnetor!uunet!husc6!cmcl2!brl-adm!adm!C04661DC%WUVMD.BITNET@CUNYVM.CUNY.EDU
From: C04661DC%WUVMD.BITNET@CUNYVM.CUNY.EDU (David Camp)
Newsgroups: comp.lang.c
Subject: Automatic Filename Extensions
Message-ID: <12901@brl-adm.ARPA>
Date: 10 Apr 88 20:10:02 GMT
Sender: news@brl-adm.ARPA
Lines: 29


     A programming technique I have frequently used is:

if (strchr (filename, '.') == NULL)
    strcat (filename, ".EXT");

in order to implement default filename extensions.  If the user
wanted to specify a filename with no extension, he simply ends
it with a '.' character.

     I recently realized that this fails for the odd filename
with '.' in the path, such as ".filename" or "..filename".
To fix it, I shall use:

if (filename [strlen (filename) - 1] != '.')
    strcat (filename, ".EXT");

I hope this is helpful to others struggling to get it right.
-David-

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