mktime.c fixes (part 5 of 6): fix boundary-condition overflows

[Ulrich Drepper]

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Paul Eggert wrote:
> This patch is the heart of the fixes to mktime.c.  I went through the
> code and carefully looked for all overflow problems, and fixed them.

There is no chance I'll apply this without you showing what the problems
are, that the old code has problems, and that the new code fixes it.

Provide a test suite which shows the problems.  If you cannot do this
there is no need for the patch.

- -- 
➧ Ulrich Drepper ➧ Red Hat, Inc. ➧ 444 Castro St ➧ Mountain View, CA ❖
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