freebsd-skq/lib/libc/iconv/iconvlist.3
gabor c91ab1769b 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
2011-02-25 00:04:39 +00:00

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.\" Copyright (c) 2009 Gabor Kovesdan <gabor@FreeBSD.org>
.\" All rights reserved.
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.\" Specifications Issue 6, Copyright (C) 2001-2004 by the Institute of
.\" Electrical and Electronics Engineers, Inc and The Open Group. In the
.\" event of any discrepancy between this version and the original IEEE and
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.\" $FreeBSD$
.\"
.Dd October 20, 2009
.Dt ICONVLIST 3
.Os
.Sh NAME
.Nm iconvlist
.Nd retrieving a list of character encodings supported by
.Xr iconv 3
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In iconv.h
.Ft void
.Fo iconvlist "char ***names" "size_t count" "bool paired"
.Fa "int \*[lp]*do_one\*[rp]\*[lp]unsigned int *count, const char * const *names, void *arg\*[rp]"
.Fa "void *arg"
.Fc
.Sh DESCRIPTION
The
.Fn iconvlist
function obtains a list of character encodings that are supported by the
.Xr iconv 3
call.
The
.Fn do_one
callback function will be called, where the
.Fa count
argument will be set to the number of the encoding names found, the
.Fa names
argument will be the list of the supported encoding names and the
.Fa arg
argument will be the \"outer\"
.Fa arg
argument of the
.Fn iconvlist
function.
This argument can be used to interchange custom data between the caller of
.Fn iconvlist
and the callback function.
.Pp
If an error occurs,
.Fa names
will be NULL when calling
.Fn do_one .
.Sh SEE ALSO
.Xr iconv 3 ,
.Xr __iconv_get_list 3 ,
.Xr __iconv_free_list 3
.Sh STANDARDS
The
.Nm
function is a non-standard extension, which appeared in
the GNU implementation and was adopted in
.Fx 9
for compatibility's sake.
.Sh AUTHORS
This manual page was written by
.An Gabor Kovesdan Aq gabor@FreeBSD.org .