[PATCH] Avoid side effects in putc(), which may be implemented as a macro

[Dan Fandrich]

On Wed, Sep 08, 2010 at 02:24:02PM +0200, Denys Vlasenko wrote:
> Please, do not convert it to for(). I like while().

Ok.

> This definitely looks wrong. You need to add {}s.

Whoops--missed that.  Here's an amended patch.

>>> Dan
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