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libc: further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using mis-identified many licenses so this was mostly a manual - error
p

libc: further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using mis-identified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

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MFC @ r266724

An SVM update will follow this.

Merge head

IFC @264767

- In the libiconv module for ISO 2022 restore the original order of the
fields of a private struct such that variables of this type are
initialised correctly. Fixes conversion from ISO 2022.
A

- In the libiconv module for ISO 2022 restore the original order of the
fields of a private struct such that variables of this type are
initialised correctly. Fixes conversion from ISO 2022.
Also do this in the BIG5 module to prevent similar errors in the future.
- In the libiconv module for EUC-TW replace 2^cs with 1<<cs. Fixes
conversion from EUC-TW.
- Synchronise iconv code with NetBSD. In most cases this only updates
the RCS id because the changes are already there or are NetBSD specific.
+ libc/iconv/citrus_csmapper.c: Add a comment.
+ libc/iconv/citrus_db_factory.c: Remove put16().
+ libc/iconv/citrus_iconv.c: Return EINVAL on error.
+ libc/iconv/citrus_mapper.c: Return EINVAL on error.
+ libc/iconv/citrus_memstream.c: Fix type of a variable.
+ libc/iconv/citrus_prop.h: Sync definition of _CITRUS_PROP_HINT_END.
+ libc/iconv/citrus_stdenc.c: Return EINVAL on error.
+ libiconv_modules/mapper_std/citrus_mapper_std.c: Plug memory leak.

Obtained from: NetBSD
MFC after: 2 weeks

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Merge head up to r263906.

Merge from head up to r262472.

Consistently pass around context information using a simple pointer. This
fixes some dereferencing bugs in Chinese character set conversions.

PR: 185964
MFC after: 5 days

Add the BSD-licensed Citrus iconv to the base system with default off
setting. It can be built by setting the WITH_ICONV knob. While this
knob is unset, the library part, the binaries, the header fil

Add the BSD-licensed Citrus iconv to the base system with default off
setting. It can be built by setting the WITH_ICONV knob. While this
knob is unset, the library part, the binaries, the header file and
the metadata files will not be built or installed so it makes no impact
on the system if left turned off.

This work is based on the iconv implementation in NetBSD but a great
number of improvements and feature additions have been included:

- Some utilities have been added. There is a conversion table generator,
which can compare conversion tables to reference data generated by
GNU libiconv. This helps ensuring conversion compatibility.
- UTF-16 surrogate support and some endianness issues have been fixed.
- The rather chaotic Makefiles to build metadata have been refactored
and cleaned up, now it is easy to read and it is also easier to add
support for new encodings.
- A bunch of new encodings and encoding aliases have been added.
- Support for 1->2, 1->3 and 1->4 mappings, which is needed for
transliterating with flying accents as GNU does, like "u.
- Lots of warnings have been fixed, the major part of the code is
now WARNS=6 clean.
- New section 1 and section 5 manual pages have been added.
- Some GNU-specific calls have been implemented:
iconvlist(), iconvctl(), iconv_canonicalize(), iconv_open_into()
- Support for GNU's //IGNORE suffix has been added.
- The "-" argument for stdin is now recognized in iconv(1) as per POSIX.
- The Big5 conversion module has been fixed.
- The iconv.h header files is supposed to be compatible with the
GNU version, i.e. sources should build with base iconv.h and
GNU libiconv. It also includes a macro magic to deal with the
char ** and const char ** incompatibility.
- GNU compatibility: "" or "char" means the current local
encoding in use
- Various cleanups and style(9) fixes.

Approved by: delphij (mentor)
Obtained from: The NetBSD Project
Sponsored by: Google Summer of Code 2009

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