src/lib/libc/db, branch releng/11.3

Revert r330897:

2018-03-29T02:50:57Z

This was intended to be a non-functional change. It wasn't. The commit message was thus wrong. In addition it broke arm, and merged crypto related code. Revert with prejudice. This revert skips files touched in r316370 since that commit was since MFCed. This revert also skips files that require $FreeBSD$ property changes. Thank you to those who helped me get out of this mess including but not limited to gonzo, kevans, rgrimes. Requested by: gjb (re)

Partial merge of the SPDX changes

2018-03-14T03:19:51Z

These changes are incomplete but are making it difficult to determine what other changes can/should be merged. No objections from: pfg

MFC r306349:

2017-02-10T06:31:31Z

r306349 (by pfg): hash(3): protect in-memory page when using cross-endianness. When writing out pages in the "other endian" format, make a copy instead of trashing the in-memory one. Obtained from: NetBSD (CVS rev. 1.29)

MFC r306332:

2016-10-19T16:33:43Z

btree(3): don't shortcut closing if the metadata is dirty. Obtained from: NetBSD (from krb5 tree)

Fix prototype of dbm_open().

2016-05-31T18:32:57Z

The last argument of dbm_open() should be a mode_t according to POSIX; not an int. Reviewed by: pfg, kib Differential Revision: https://reviews.freebsd.org/D6650

Let dbm's datum::dptr use the right type.

2016-05-30T16:52:23Z

According to POSIX, it should use void *, not char *. Unfortunately, the dsize field also has the wrong type. It should be size_t. I'm not going to change that, as that will break the ABI. Reviewed by: pfg Differential Revision: https://reviews.freebsd.org/D6647

libc: make more use of the howmany() macro when available.

2016-04-26T01:17:05Z

We have a howmany() macro in the header that is convenient to re-use as it makes things easier to read.

libc: use our roundup2/rounddown2() macros when param.h is available.

2016-04-20T01:21:39Z

rounddown2 tends to produce longer lines than the original code but still it makes the code more readable.

libc: do not include where was already included

2016-04-18T21:05:15Z

According to style(9): > normally, include OR , but not both. ( already includes when LOCORE is not defined).

libc: replace 0 with NULL for pointers.

2016-04-10T19:33:58Z

While here also cleanup some surrounding code; particularly drop some malloc() casts. Found with devel/coccinelle. Reviewed by: bde (previous version - all new bugs are mine)