注意：我已经在AskDivent上问了这个问题，并且作为关闭主题而被关闭。
我正在考虑编写C程序（或者是程序生成器），该程序需要处理Unicode文本。仅处理UTF-8就足够了，但是处理其他编码也很不错。为此，我需要知道宽字符的C库API如何工作。为了进行比较，这是GNU库的那些API的写作非常好的说明：
https://www.gnu.org/software/libc/manual/manual/html_node/ususe-wide-char-classes.html
and
和
和
特别是，GNU库选择在Unicode代码点和 WCHAR_TCHAR_T. 值，但这显然不是唯一可能的选择。我该如何确定达尔文图书馆在这些方面做什么？是否有与我引用的GNU手册相当范围的文件？
更一般而言，是否有GNU信息或HTML手册之类的东西，但是涵盖了Darwin Libc？我意识到，大多数正常用途都将被POSIX和相关标准所涵盖，但是当然，这些用途会留下很多开放的问题，例如上述问题。
Note: I have asked this on AskDifferent, and it was closed as off topic.
I am thinking of writing a C program (or rather, a program generator) which will need to process Unicode text. It will be sufficient to process just UTF-8, but it would be nice to handle other encodings as well. In order to do this I need to know how the C library API for wide characters works. For comparison, here is a very well written and detailed explanation of those APIs for the GNU library:
https://www.gnu.org/software/libc/manual/html_node/Using-Wide-Char-Classes.html
and
https://www.gnu.org/software/libc/manual/html_node/Extended-Char-Intro.html
and
https://www.gnu.org/software/libc/manual/html_node/Streams-and-I18N.html
In particular, the GNU library chooses to have a 1-1 mapping between Unicode code points and wchar_t values, but this is clearly not the only possible choice. How can I determine what the Darwin library does in these respects? Is there a document of comparable scope to the GNU manual I quoted?
More generally, is there anything like the GNU Info or HTML manuals for the glibc, but covering the Darwin libc? I realize that most normal use will be covered by POSIX and related standards, but of course those leave a lot of things open, such as the issues mentioned above.
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