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

abort_handler_s() currently simply calls abort(), though the standard
specifies more: "Writes an implementation-defined message to s

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

abort_handler_s() currently simply calls abort(), though the standard
specifies more: "Writes an implementation-defined message to stderr
which must include the string pointed to by msg and calls abort()."

memset_s() is missing error condition "n > smax", and does not invoke
the constraint handler after filling the buffer: "following errors are
detected at runtime and call the currently installed constraint
handler function after storing ch in every location of the destination
range [dest, dest+destsz) if dest and destsz are themselves valid",
one of the errors is "n > smax" itself.

Submitted by: Yuri Pankov <[email protected]>
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D11991

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Implement the memset_s(3) function as specified by the C11 ISO/IEC
9899:2011 Appendix K 3.7.4.1.

Other needed supporting types, defines and constraint_handler
infrastructure is added as specified in

Implement the memset_s(3) function as specified by the C11 ISO/IEC
9899:2011 Appendix K 3.7.4.1.

Other needed supporting types, defines and constraint_handler
infrastructure is added as specified in the C11 spec.

Submitted by: Tom Rix <[email protected]>
Sponsored by: Juniper Networks
Discussed with: ed
MFC after: 3 weeks
Differential revision: https://reviews.freebsd.org/D9903
Differential revision: https://reviews.freebsd.org/D10161

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