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GRPC C STYLE GUIDE
=====================
Background
----------
Here we document style rules for C usage in the gRPC Core library.
General
-------
- Layout rules are defined by clang-format, and all code should be passed through
clang-format. A (docker-based) script to do so is included in
tools/distrib/clang_format_code.sh.
Header Files
------------
- Public header files (those in the include/grpc tree) should compile as pedantic C89
- Public header files should be includable from C++ programs. That is, they should
include the following:
```c
#ifdef __cplusplus
extern "C" {
# endif
/* ... body of file ... */
#ifdef __cplusplus
}
# endif
```
- Header files should be self-contained and end in .h.
- All header files should have a #define guard to prevent multiple inclusion.
To guarantee uniqueness they should be based on the file's path.
For public headers: include/grpc/grpc.h --> GRPC_GRPC_H
For private headers:
src/core/channel/channel_stack.h --> GRPC_INTERNAL_CORE_CHANNEL_CHANNEL_STACK_H
C99 Features
------------
- Variable sized arrays are not allowed
- Do not use the 'inline' keyword
- Flexible array members are allowed (https://en.wikipedia.org/wiki/Flexible_array_member)
Comments
--------
Within public header files, only `/* */` comments are allowed.
Within implementation files and private headers, either single line `//`
or multi line `/* */` comments are allowed. Only one comment style per file is
allowed however (i.e. if single line comments are used anywhere within a file,
ALL comments within that file must be single line comments).
Symbol Names
------------
- Non-static functions must be prefixed by grpc_
- static functions must not be prefixed by grpc_
- enumeration values and #define names are uppercased, all others are lowercased
- Multiple word identifiers use underscore as a delimiter (NEVER camel casing)
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