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9eced53a8d
The method would not return an error message, now it does, typically if a conversion is not supported.
146 lines
4.8 KiB
Markdown
146 lines
4.8 KiB
Markdown
# Lua-iconv
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Perform character set conversions in Lua
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(c) 2005-11 Alexandre Erwin Ittner <alexandre@ittner.com.br>
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## Introduction
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Lua-iconv provides POSIX 'iconv' bindings for the Lua Programming Language.
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The iconv library converts a sequence of characters from one codeset into a sequence of corresponding characters in another codeset.
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The codesets are those specified in the `iconv.new()` call that returned the conversion descriptor, `cd`.
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Lua-iconv 7 *requires* Lua 5.1 or Lua 5.2. For Lua 5.0, use the first release (lua-iconv-r1).
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Details on iconv may be obtained in the [Open Group's interface definition](http://www.opengroup.org/onlinepubs/007908799/xsh/iconv.h.html).
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## Download and installation
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Lua-iconv can be obtained from [its GitHub project page](https://github.com/lunarmodules/lua-iconv), from a LuaRocks server, or from some Linux distributions which already provide it (eg. Debian).
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Unless you downloaded a compiled package, you must build the library for your system.
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If you have LuaRocks installed, all the process is automatic; just fire up your favourite shell and type, as root:
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```console
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luarocks install lua-iconv
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```
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and the package will be downloaded from a rock server, installed and configured.
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Otherwise, you must compile and install the package.
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In a system with pkg-config (as many Linux distributions and Unix flavors) open a shell, untar the distribution package and, within the program directory, type:
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```console
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make install
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```
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as root.
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The library will be compiled and installed on the in the correct path (which is defined in lua5.x.pc).
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Compiling on systems without pkg-config requires manual changes in the Makefile (this includes Windows).
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## Loading and initialization
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Lua-iconv is a shared library that must be loaded in the Lua interpreter before use.
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You can simply do a
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```lua
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local iconv = require("iconv")
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```
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call to load up the library (that, of course, must be installed in a directory from `package.cpath`).
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## API documentation
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```lua
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cd, err = iconv.new(to, from)
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cd, err = iconv.open(to, from)
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```
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Opens a new conversion descriptor, from the 'from' charset to the 'to' charset.
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Concatenating "//TRANSLIT" to the first argument will enable character transliteration and concatenating "//IGNORE" to the first argument will cause iconv to ignore any invalid characters found in the input string.
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The error code, may have any of the following values:
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* `nil`
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No error. Creation was successful.
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* `iconv.ERROR_INVALID`
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The conversion from `from` to `to` is not supported by the implementation.
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* `iconv.ERROR_UNKNOWN`
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There was an unknown error.
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This function returns a new converter or nil+err on error.
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```lua
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nstr, err = cd:iconv(str)
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```
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Converts the 'str' string to the desired charset.
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This method always returns two arguments: the converted string and an error code, which may have any of the following values:
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* `nil`
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No error. Conversion was successful.
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* `iconv.ERROR_NO_MEMORY`
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Failed to allocate enough memory in the conversion process.
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* `iconv.ERROR_INVALID`
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An invalid character was found in the input sequence.
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* `iconv.ERROR_INCOMPLETE`
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An incomplete character was found in the input sequence.
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* `iconv.ERROR_FINALIZED`
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Trying to use an already-finalized converter. This usually means
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that the user was tweaking the garbage collector private methods.
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* `iconv.ERROR_UNKNOWN`
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There was an unknown error.
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## License
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Lua-iconv is copyrighted free software: it can be used for both academic
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and commercial purposes at absolutely no cost. There are no royalties
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or GNU-like "copyleft" restrictions. The legal details are below:
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Lua-iconv is (c) 2005-11 Alexandre Erwin Ittner
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of this software and associated documentation files (the
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"Software"), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so, subject
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to the following conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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IN NO EVENT SHALL THE AUTHOR OR COPYRIGHT HOLDER BE LIABLE FOR ANY
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CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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If you use this package in a product, an acknowledgment in the product
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documentation would be greatly appreciated (but it is not required).
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