docs: Provide translation for c.rst

docs/en/api-guides/c.rst

@@ -3,9 +3,7 @@ C Support
 
 :link_to_translation:`zh_CN:[中文]`
 
-.. highlight:: cpp
-
-ESP-IDF is primarily written in C and provides C APIs. `Newlib <https://sourceware.org/newlib/>`_ is used as standard C library (the Newlib version can be found in :component_file:`newlib/sbom.yml`). In general, all C features supported by the compiler, currently GCC, should be available in ESP-IDF, unless specified in :ref:`unsupported_c_features` below.
+ESP-IDF is primarily written in C and provides C APIs. ESP-IDF uses `Newlib <https://sourceware.org/newlib/>`_ as its C Standard Library implementation (the Newlib version is specified in :component_file:`newlib/sbom.yml`). In general, all C features that are supported by the compiler (currently GCC) can be used in ESP-IDF, unless specified in :ref:`unsupported_c_features` below.
 
 .. _c_version:
 
@@ -33,4 +31,4 @@ The following features are not supported in ESP-IDF.
 Nested Function Pointers
 ^^^^^^^^^^^^^^^^^^^^^^^^
 
-The **GNU dialect of ISO C17** supports `nested functions <https://gcc.gnu.org/onlinedocs/gcc/Nested-Functions.html>`_. However, they do not work in ESP-IDF when referenced as function pointer because the compiler generates a trampoline on the stack, while the stack is not executable in ESP-IDF. Hence, do not use function pointers to nested functions.
+The **GNU dialect of ISO C17** supports `nested functions <https://gcc.gnu.org/onlinedocs/gcc/Nested-Functions.html>`_. However, ESP-IDF does not support referencing nested functions as pointers. This is due to the fact that the GCC compiler generates a `trampoline <https://gcc.gnu.org/onlinedocs/gccint/Trampolines.html>`_ (i.e., small piece of executable code) on the stack when a pointer to a nested function is referenced. ESP-IDF does not permit executing code from a stack, thus use of pointers to nested functions is not supported.

docs/zh_CN/api-guides/c.rst

@@ -1 +1,34 @@
-.. include:: ../../en/api-guides/c.rst
+C 支持
+======
+
+:link_to_translation:`en:[English]`
+
+ESP-IDF 主要使用 C 语言编写，并提供 C 语言 API。ESP-IDF 使用 `Newlib <https://sourceware.org/newlib/>`_ 作为 C 标准函数库对实现（Newlib 版本可以在 :component_file:`newlib/sbom.yml` 指定）。一般来说，除非在下面的 :ref:`unsupported_c_features` 中特别说明，当前使用的编译器（目前是 GCC）支持的所有 C 语言功能在 ESP-IDF 中均可使用。
+
+.. _c_version:
+
+C 版本
+------
+
+**ISO C17 的 GNU 方言** (``--std=gnu17``) 是 ESP-IDF 中当前默认的 C 语言版本。
+
+使用不同的语言标准编译某个组件的源代码，请在组件的 ``CMakeLists.txt`` 文件中设置所需的编译器标志：
+
+.. code-block:: cmake
+
+    idf_component_register( ... )
+    target_compile_options(${COMPONENT_LIB} PRIVATE -std=gnu11)
+
+如果组件的公共头文件也需要使用相同的语言标准编译，请将标志 ``PRIVATE`` 替换为 ``PUBLIC``。
+
+.. _unsupported_c_features:
+
+不支持的 C 功能
+---------------
+
+ESP-IDF 不支持以下功能。
+
+嵌套函数的指针
+^^^^^^^^^^^^^^
+
+**ISO C17 的 GNU 方言** 支持 `嵌套函数 <https://gcc.gnu.org/onlinedocs/gcc/Nested-Functions.html>`_，但 ESP-IDF 不支持将嵌套函数引用为指针。这是因为 GCC 编译器在引用嵌套函数的指针时，会在栈上生成一个 `跳板 <https://gcc.gnu.org/onlinedocs/gccint/Trampolines.html>`_ （即，一小段可执行代码），ESP-IDF 不允许从栈执行代码，因此不支持使用指向嵌套函数的指针。