src/include/string.h, branch upstream/11.2.0

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 r304106:

2017-05-31T06:47:56Z

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

MFC r316213:

2017-04-23T20:32:46Z

Implement the memset_s(3) function as specified by the C11 ISO/IEC 9899:2011 Appendix K 3.7.4.1. MFC r316258: Only activate __EXT1_VISIBLE block when using sys/errno.h in userspace.

include: Remove checks for __BSD_VISIBLE where redundant with __XSI_VISIBLE

2014-05-11T13:48:21Z

or __POSIX_VISIBLE. Whenever sets __BSD_VISIBLE to non-zero, it also sets __POSIX_VISIBLE and __XSI_VISIBLE to the newest version supported. No functional change is intended.

FreeBSD uses #if __BSD_VISIBLE to hide non-standard functions, fix this.

2013-02-14T19:26:58Z

Noticed by: kib Approved by: kib

Add strchrnul(), a GNU function similar to strchr(), except that it returns

2013-02-13T15:46:33Z

a pointer to the end of the string, rather than NULL, if the character was not found. Approved by: theraven

Correctly expose xlocale functions if people include the headers in the wrong

2012-03-28T12:11:54Z

order (as some ports apparently do). Approved by: dim (mentor)

Reapply 227753 (xlocale cleanup), plus some fixes so that it passes build

2012-03-04T15:31:13Z

universe with gcc. Approved by: dim (mentor)

Revert r231673 and r231682 for now, until we can run a full make

2012-02-14T21:48:46Z

universe with them. Sorry for the breakage. Pointy hat to: me and brooks