Revise qsort(3 reflect POSIX.1-2024 update.

Reviewed by: emaste, trasz
MFC after: 3 days
Differential Revision: https://reviews.freebsd.org/D47262

lib: Remove ancient SCCS tags.

Remove ancient SCCS tags from the tree, automated scripting, with two
minor fixup to keep things compiling. All the common forms in the tree
were removed with a perl s

lib: Remove ancient SCCS tags.

Remove ancient SCCS tags from the tree, automated scripting, with two
minor fixup to keep things compiling. All the common forms in the tree
were removed with a perl script.

Sponsored by: Netflix

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Remove $FreeBSD$: one-line nroff pattern

Remove /^\.\\"\s*\$FreeBSD\$$\n/

libc: Add missing object size check to qsort_s(3)

When sorting, both the C11 standard (ISO/IEC 9899:2011, K.3.6.3.2) and
the ISO/IEC JTC1 SC22 WG14 N1172 standard, does not define objects of
zero si

libc: Add missing object size check to qsort_s(3)

When sorting, both the C11 standard (ISO/IEC 9899:2011, K.3.6.3.2) and
the ISO/IEC JTC1 SC22 WG14 N1172 standard, does not define objects of
zero size as undefined behaviour. However Microsoft's cpp-docs does.

Add proper checks for this. Found while working on bsort(3).

Reviewed by: kib@ and emaste@
MFC after: 1 week
Sponsored by: NVIDIA Networking
Differential Revision: https://reviews.freebsd.org/D39687

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Alter the prototype of qsort_r(3) to match POSIX, which adopted the
glibc-based interface.

Unfortunately, the glibc maintainers, despite knowing the existence
of the FreeBSD qsort_r(3) interface in

Alter the prototype of qsort_r(3) to match POSIX, which adopted the
glibc-based interface.

Unfortunately, the glibc maintainers, despite knowing the existence
of the FreeBSD qsort_r(3) interface in 2004 and refused to add the
same interface to glibc based on grounds of the lack of standardization
and portability concerns, has decided it was a good idea to introduce
their own qsort_r(3) interface in 2007 as a GNU extension with a
slightly different and incompatible interface.

With the adoption of their interface as POSIX standard, let's switch
to the same prototype, there is no need to remain incompatible.

C++ and C applications written for the historical FreeBSD interface
get source level compatibility when building in C++ mode, or when
building with a C compiler with C11 generics support, provided that
the caller passes a fifth parameter of qsort_r() that exactly matches
the historical FreeBSD comparator function pointer type and does not
redefine the historical qsort_r(3) prototype in their source code.

Symbol versioning is used to keep old binaries working.

MFC: never
Relnotes: yes
Reviewed by: cem, imp, hps, pauamma
Differential revision: https://reviews.freebsd.org/D17083

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Merge ^/head r356920 through r356930.

qsort.3: Bump Dd and note that Annex K is optional

Merge ^/head r356848 through r356919.

Add qsort_s(3). Apart from the constraints, it also makes it easier
to port software written for Linux variant of qsort_r(3).

Reviewed by: kib, arichardson
MFC after: 2 weeks
Relnotes: yes
Sponsore

Add qsort_s(3). Apart from the constraints, it also makes it easier
to port software written for Linux variant of qsort_r(3).

Reviewed by: kib, arichardson
MFC after: 2 weeks
Relnotes: yes
Sponsored by: DARPA
Differential Revision: https://reviews.freebsd.org/D23174

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Don't put multiple names on a single .Nm line. This fixes apropos(1)
output, from this:

strnlen, strlen, strlen,(3) - find length of string

Don't put multiple names on a single .Nm line. This fixes apropos(1)
output, from this:

strnlen, strlen, strlen,(3) - find length of string │·······

... to this:

strlen, strnlen(3) - find length of string

PR: 223525
MFC after: 2 weeks

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Fixed indentation, minor style.

MFC @ r266724

An SVM update will follow this.

Merge head

IFC @264767

Add support for some block functions that come from OS X. These are
intended to build with any C compiler.

Reviewed by: pfg
MFC after: 3 weeks

Merge from head

IFC @ r254014

IFC @253398

Merge fresh head.

Renumber clauses to reduce diffs to other versions

NetBSD, OpenBSD, and Android's Bionic number the clauses 1 through 3,
so follow suit to make comparison easier.

sync from head

IFC @247348.

Sort sections.

Various improvements to the qsort(3) usage example:

- Remove unused #include.
- Do not cast away const.
- Use the canonical idiom to compare two numbers.
- Use proper type for sizes, i.e. size_t ins

Various improvements to the qsort(3) usage example:

- Remove unused #include.
- Do not cast away const.
- Use the canonical idiom to compare two numbers.
- Use proper type for sizes, i.e. size_t instead of int.
- Correct indentation.
- Simplify printf("\n") to puts("").
- Use return instead of exit() in main().

Submitted by: Christoph Mallon, christoph.mallon at gmx.de
Approved by: gjb (mentor)
Reviewed by: stefanf
MFC after: 1 week

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Add a sample program that shows how a custom comparison function and
qsort(3) can work together to sort an array of integers.

PR: docs/176197
Submitted by: Fernando, fapesteguia at ope

Add a sample program that shows how a custom comparison function and
qsort(3) can work together to sort an array of integers.

PR: docs/176197
Submitted by: Fernando, fapesteguia at opensistemas.com
Approved by: gjb (mentor)
MFC after: 1 week

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