On Tue, 2005-03-29 at 13:07 +0200, Erik Mouw wrote:
> On Tue, Mar 29, 2005 at 04:26:31PM +0530, Mandeep Sandhu wrote:
> > On Tue, 2005-03-29 at 12:31 +0200, Erik Mouw wrote:
> > > On Tue, Mar 29, 2005 at 03:54:13PM +0530, Mandeep Sandhu wrote:
> > > Literial \0 after the string, so string is too long.
> > the '\0' got appended at the end when i created the string....
> > I'm don't get what you mean by string being too long.
>
> You shouldn't copy it to userland. \0 happens to be the string
> terminator used in C, but it is by no means a general string
> terminator.
>
> > > > count = sizeof(msg);
> > >
> > > Here's your error, that should be count = strlen(msg);
> > >
> > strlen(msg) is 5. (i.e the length of the string)
> > sizeof(msg) is 6. (length + the null terminating char)
> >
> > so while copying data into the userspace buffer...I should
> > omit copying this null term ('\0') char???? won't the user
> > prog be expecting this at the end of the string? or it'll (cat)
> > handle it on it's own?
>
> No, userland doesn't expect it, and it will confuse your terminal.
> printf() used in userland programs also doesn't print a \0 after every
> line, and with reason: \0 is *only* the string terminator used
> internally in C, *not* a way to signal end-of-file to userland.
>
ok folks! i tried strlen too......but to no avail! :(
still only putting `\n' does the trick! what say Erik?
>
> Erik
>
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