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diff --git a/CODING-STYLE.md b/CODING-STYLE.md new file mode 100644 index 0000000..e62b1df --- /dev/null +++ b/CODING-STYLE.md @@ -0,0 +1,184 @@ +# Coding Style + +This is a short document describing the preferred coding style for the UEFI Monitor Test. It is in many ways exactly the same as the EDKII coding style. + +### 1. Indentation + +Indentation are 2 spaces. Having 2-character indentations makes the code don't move too far to the right, and makes it easy to read on a 80-character terminal screen. + +Never use tab characters. Set editor to insert spaces rather than a tab character. + +Correct: + +``` +if (TRUE) { + Print (L"Hello, world!\n"); +} +``` + +Incorrect: + +``` +if (TRUE) { + Print (L"Hello, world!\n"); +} +``` + +### 2. Breaking long lines and strings + +The preferred limit on the length of a single line is 80 characters. If statements longer than 80 columns, then you should break it into sensible chunks + +These same rules are applied to function headers with a long argument list. + +### 3. Placing braces and spaces + +The preferred way is to put the opening brace last on the line, and put the closing brace first: + +``` +if (TRUE) { + Print (L"Hello, world!\n"); +} +``` + +This applies to all non-function statement blocks (if, switch, for, while, do). Always use braces, even when there is only one statement: + +``` +for (Index = 0; Index < MaxVal; Index++) { + FreePool (Buffer[Index]); +} +``` + +However, there is one special case, namely functions. The opening brace should always appear separately on the a new line: + +``` +VOID +SomeFunction ( + VOID + ) +{ + ... +} +``` + +### 4. Naming + +[CamelCase](https://en.wikipedia.org/wiki/Camel_case) used for variables, functions and file names: + +``` +#include "FooFileName.h" +... +VOID SuperFunction ( + ... + UINTN ALocalVariable; + UINTN UefiVersion; +``` + +UPPERCASE used for types and macros: + +``` +#define BOOT_MANAGER_FORMSET_GUID \ + { \ + 0x847bc3fe, 0xb974, 0x446d, {0x94, 0x49, 0x5a, 0xd5, 0x41, 0x2e, 0x99, 0x3b} \ + } + +#define BOOT_MANAGER_FORM_ID 0x1000 + +#define BOOT_MANAGER_CALLBACK_DATA_SIGNATURE SIGNATURE_32 ('B', 'M', 'C', 'B') +``` + +### 5. Use UEFI types + +Never use C types. UEFI has macros for common data types. They are in the file `MdePkg/Include/_Arch_/ProcessorBind.h`. + +Correct: + +``` +INTN ALocalVariable; +UINTN UefiVersion; +VOID *Ptr; +``` + +Incorrect: + +``` +int ALocalVariable; +unsigned int UefiVersion; +void *Ptr; +``` + + +## Examples + +### C file + +``` +/** + Brief and Detailed Descriptions. + + @param[in] Arg1 Description of Arg1. + @param[in] Arg2 Description of Arg2, which is optional. + @param[out] Arg3 Description of Arg3. + @param[in, out] Arg4 Description of Arg4. + + @retval EFI_SUCCESS Description of what EFI_SUCCESS means. + @retval !EFI_SUCCESS Failure. + +**/ +EFI_STATUS +EFIAPI +FooName ( + IN UINTN Arg1, + IN UINTN Arg2 OPTIONAL, + OUT UINTN *Arg3, + IN OUT UINTN *Arg4 + ) +{ + UINTN Local; + UINTN AnotherLocal; + + ... + + for (Local = 0; Local < 5; Local++) { + if (Local == 2) { + Print (L"Local: %d (yes! 2)\n", Local); + } else { + Print (L"Local: %d\n", Local); + } + } + + ... +} +``` + +### H file + +``` +#define FOO_MACRO(a, b) ((a) * (b)) + +#define FOO_CONSTANT 0xcafe + +/** + Brief and Detailed Descriptions. + + @param[in] Arg1 Description of Arg1. + @param[in] Arg2 Description of Arg2, which is optional. + @param[out] Arg3 Description of Arg3. + @param[in, out] Arg4 Description of Arg4. + + @retval EFI_SUCCESS Description of what EFI_SUCCESS means. + @retval !EFI_SUCCESS Failure. + +**/ +EFI_STATUS +EFIAPI +FooName ( + IN UINTN Arg1, + IN UINTN Arg2 OPTIONAL, + OUT UINTN *Arg3, + IN OUT UINTN *Arg4 + ); + +... + +#endif +``` |