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[bug-diffutils] bug#17075: bug#17075: diff - - exits immediately

From: Paul Eggert
Subject: [bug-diffutils] bug#17075: bug#17075: diff - - exits immediately
Date: Sun, 23 Mar 2014 14:47:13 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.4.0

Karl Berry wrote:
It seems like it should either read stdin twice (probably too much
trouble), or read stdin once and then abort when it can't be read again,
or just abort immediately.  Or something, just not success.

I don't see why 'diff' should be prohibited from optimizing the case 'diff A A'. 'diff' should be allowed to read 'A' just once (or even not at all, which is what 'diff' actually does). '-' is just a special case of this.

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