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

MFC: 325765 (imp) Add notes about overlapping copies.

2019-01-22T21:52:07Z

Add notes to each of these that specifically state that results are undefined if the strings overlap. In the case of memcpy, we document the overlapping behavior on FreeBSD (pre-existing). For str*, it is left unspecified, however, since the default (and x86) implementations do not handle overlapping strings properly. PR: 223653 Approved by: phk (mentor)

MFC r338051:

2018-08-22T13:45:15Z

Provide set_constraint_handler_s(3) man page.

MFC r338049:

2018-08-22T13:44:24Z

Clarify that memset_s(3) requires __STDC_WANT_LIB_EXT1__ for visibility. Fix typos and other nits.

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 r329361:

2018-02-24T18:16:28Z

Document memset_s(3). memset_s(3) is defined in C11 standard (ISO/IEC 9899:2011) K.3.7.4.1 The memset_s function (p: 621-622) Fix memset(3) portion of the man page by replacing the first argument (destination) "b" with "dest", which is more descriptive than "b". This also makes it consistent with the term used in the memset_s() portion of the man page. See also http://en.cppreference.com/w/c/string/byte/memset. Reviewed by: kib Differential Revision: https://reviews.freebsd.org/D13682

MFC r322427:

2017-08-19T09:38:43Z

Improve standard compliance for memset_s() and abort_handler_s().

MFC r322426:

2017-08-15T09:40:57Z

Fix indent.

MFC r304106:

2017-05-31T06:47:56Z

Add timingsafe_bcmp and timingsafe_memcmp. Obtained from: OpenBSD Reviewed by: trasz

MFC r317034:

2017-05-01T12:42:06Z

Fix strcoll_l disagreeing with strxfrm by reworking the forward order case in wcscoll_l(). Illumos fixed this while grabbing back our patches: https://www.illumos.org/rb/r/402/ This does not 100% fix what postgresql folks reported as there is still a remaining issue: https://www.illumos.org/issues/7962, it improves the situation The initial issue was reported in postgresql mailing lists: https://www.postgresql.org/message-id/flat/111D0E27-A8F3-4A84-A4E0-B0FB703863DF@s24.com#111D0E27-A8F3-4A84-A4E0-B0FB703863DF@s24.com Submitted by: Yuri Pankov Obtained from: Illumos