Jeff King wrote:
> On Tue, Apr 28, 2015 at 10:07:43PM +0200, erik elfström wrote:

>> Also if it turns out that we actually need to treat the "file too
>> large" error differently in clean (as discussed in thread on the file
>> size check) then we can no longer communicate that back using the
>> strbuf interface.
>
> Yeah, agreed. This system breaks down as soon as you need to
> programatically know which error happened.

On the contrary: it separates the information that is used
programatically and the information intended for the user.

The return value (or an int * parameter) distinguishes errors that
affect control flow.  A string can provide information for the user.

This way it is easy to tweak the information that the user sees in
one place, without changing control flow.
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