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Fix size measurement in bytevector_large_set

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* libguile/bytevectors.c (bytevector_large_set): Fix computation of
  value size in words.
* test-suite/tests/bytevectors.test: Add test.

Thanks to Ben Rocer <fleabyte@mail.com> for the bug report and fix.
This commit is contained in:
Andy Wingo 2016-06-20 17:11:59 +02:00
parent 0a3ea0586d
commit b77642dff2
2 changed files with 9 additions and 4 deletions
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7
libguile/bytevectors.c
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@ -857,10 +857,11 @@ bytevector_large_set (char *c_bv, size_t c_size, int signed_p,
memset (c_bv, 0, c_size);
else
{
size_t word_count, value_size;
size_t word_count, value_words;
value_size = (mpz_sizeinbase (c_mpz, 2) + (8 * c_size)) / (8 * c_size);
if (SCM_UNLIKELY (value_size > c_size))
value_words = ((mpz_sizeinbase (c_mpz, 2) + (8 * c_size) - 1) /
(8 * c_size));
if (SCM_UNLIKELY (value_words > 1))
{
err = -2;
goto finish;

6
test-suite/tests/bytevectors.test
View file

@ -345,7 +345,11 @@
(let ((b (make-bytevector 8)))
(bytevector-s64-set! b 0 -1 (endianness big))
(bytevector-u64-set! b 0 0 (endianness big))
(= 0 (bytevector-u64-ref b 0 (endianness big))))))
(= 0 (bytevector-u64-ref b 0 (endianness big)))))
(pass-if-exception "bignum out of range"
exception:out-of-range
(bytevector-u64-set! (make-bytevector 8) 0 (expt 2 64) (endianness big))))
(with-test-prefix/c&e "2.8 Operations on IEEE-754 Representations"