Fixes a bug introduced in cc1cd04f81
"Fix hashing of vectors to run in bounded time."
* libguile/hash.c (scm_hasher): Avoid division by zero.
* test-suite/tests/hash.test ("hash"): Add tests.
* test-suite/tests/00-socket.test:
* test-suite/tests/alist.test:
* test-suite/tests/elisp.test:
* test-suite/tests/encoding-iso88591.test:
* test-suite/tests/encoding-iso88597.test:
* test-suite/tests/encoding-utf8.test:
* test-suite/tests/hash.test:
* test-suite/tests/i18n.test:
* test-suite/tests/modules.test:
* test-suite/tests/ports.test:
* test-suite/tests/srfi-35.test: Make tests use eqv? instead of eq? when
comparing numbers, characters. Checked also for similar uses of
assq[-ref].
* test-suite/tests/vlist.test ("vhash-delete honors HASH"): Change test
to use eqv-ness, not eq-ness, which should not impact its purpose as
these two are equivalent for strings.
* libguile/hashtab.c (scm_hash_count): New function. Count the number
of elements in a hash table.
* doc/ref/api-compound.texi (Hash Tables): Update examples and
reference.
* test-suite/tests/hash.test (hash-count): New test.
* libguile/hashtab.c (scm_i_hashtable_print): Use `SCM_UNPACK', not
`SCM2PTR'.
* test-suite/tests/hash.test: Adjust tests that rely on the output of
the printer to just check for the suffix of the hash table's external
representation.
returns neither a pair nor #f, signal a wrong-type-arg error.
(Thanks to Gregory Marton for reporting this.)
* tests/hash.test: New "hashx" test supplied by Gregory Marton;
prior to today's fix in libguile/hashtab.c, this caused a
segmentation fault.
