[m-rev.] Check for overflow in string.base_string_to_int for base 10

[Julien Fischer]

On Mon, 2 Feb 2009, Ralph Becket wrote:

> Estimated hours taken: 0.5
> Branches: main
>
> Only check for overflow when converting strings to ints when the base is 10.
> Other number bases are assumed to denote bit patterns and no overflow test
> is employed.
>
> NEWS:
> 	Mention the change.
>
> library/string.m:
> 	Amend accumulate_int to perform an overflow check on base 10 numbers.
>
> tests/general/Mmakefile:
> tests/general/test_string_to_int_overflow.m:
> tests/general/test_string_to_int_overflow.exp:
> 	Add a test case.
>

That's fine (although I suggest that you boostrap it on a 32-bit machine
-- jupiter or eris**) before committing.

Julien.

** don't use swordfish as it doesn't have a recent Mercury compiler
installed.
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