Automatic Filename Extensions

[David Camp]

     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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