Re: [dwm] broken pipes

From: Manuel Badzong <>
Date: Sun, 26 Nov 2006 21:40:09 +0000

Hi Jukka

Jukka Salmi wrote:
> I'm not sure whether dwm really should try that hard to fix the input
> it is given...
Yeh, probably not necessary and wasted code.

> - '\0'-terminates the error message if read() failed (just in case
> strlen(strerror(errno)) >= sizeof stext - 1)
stext is declared as global and therefore aligned in the programs bss
segment, which will be zeroed at startup. As whether read nor strncpy
use its full length (strlen/sizeof - 1) the string will be 0 terminated
in any case. But I agree that it would be safer in case someone ever
moves it down into main (this time I'm not sure if necessary/wasted).

> - saves 1020 bytes from being zeroed unnecessarily (performance! ;-))
Ok, never thought about that. Yet I didn't read much about the
implementation of the ANSI stdio functions (I presumed to understand
them). Is strncpy really zeroing up to the specified n bytes? I thought
it just copies until '\0' or n, whatever comes first (leaving dest
unterminated in the latter case).

Regards, Manuel
Received on Sun Nov 26 2006 - 22:40:48 UTC

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