该文档描述了Tilen Majerle在其项目和库中使用的C代码样式。
让我们从GNOME开发人员网站的报价开始。
编写代码时，最重要的规则是：检查周围的代码并尝试模仿它。
作为维护者，很沮丧地收到与周围代码不同的编码方式的补丁程序。这是无礼的，就像有人穿着一尘不染的房子里穿着泥泞的鞋子一样。
因此，无论该文档建议什么，如果已经有书面代码，并且您正在修补它，那么即使不是您喜欢的样式，也要保持其当前样式一致。
VSCODE带有预装的clang-format工具（LLVM软件包的一部分），该工具已设计为在代码开发过程中为开发人员提供自动格式工具。
因此，它允许用户在文件更改（并保存）上格式化代码。保存文件后，VSCODE将尝试调用Clang-Format并格式化代码。使用的规则在.clang-format文件中。如果Clang-Format无法在当前文件的路径中找到规则，则它将一直延伸到根，直到找到一个。如果仍然没有可用，则使用默认规则。
该存储库包含始终最新的.clang-format文件，其中包含匹配解释的规则。您可以将文件夹放在根或项目中，甚至将文件夹放在软件开发项目的根部 - >使用一个文件！
应启用一些配置： 
关键字必须，不得，不得，不得，不得，不建议，不建议，不建议，可以在本文档中进行可选，应如BCP 14 [RFC2119]中所述进行解释[RFC2119] [RFC8174]
这是列出的最明显和重要的一般规则。在继续使用其他章节之前，请仔细检查它们。
clang-format应与此存储库附加的格式文件一起使用（版本15.x是最低）C11标准4空间1空间 /* OK */
if ( condition )
while ( condition )
for ( init ; condition ; step )
do {} while ( condition )
/* Wrong */
if ( condition )
while ( condition )
for ( init ; condition ; step )
do {} while ( condition ) int32_t a = sum ( 4 , 3 ); /* OK */
int32_t a = sum ( 4 , 3 ); /* Wrong */__或_前缀进行变量/函数/宏/类型。这是为C语言本身保留的prv_名称前缀，用于严格模块私有化（静态）功能libname_int_或libnamei_前缀用于库内部功能，在用户应用程序必须在不同的库内部模块上使用时，不应使用它们使用它们_ charfor ， while do switch ， if ...） size_t i ;
for ( i = 0 ; i < 5 ; ++ i ) { /* OK */
}
for ( i = 0 ; i < 5 ; ++ i ){ /* Wrong */
}
for ( i = 0 ; i < 5 ; ++ i ) /* Wrong */
{
} int32_t a ;
a = 3 + 4 ; /* OK */
for ( a = 0 ; a < 5 ; ++ a ) /* OK */
a = 3 + 4 ; /* Wrong */
a = 3 + 4 ; /* Wrong */
for ( a = 0 ; a < 5 ; ++ a ) /* Wrong */ func_name ( 5 , 4 ); /* OK */
func_name ( 4 , 3 ); /* Wrong */global变量初始化为任何默认值（或NULL ），而请在专用的init函数（如果需要）中实现。 static int32_t a ; /* Wrong */
static int32_t b = 4 ; /* Wrong */
static int32_t a = 0 ; /* Wrong */在嵌入式系统中，很常见的是，RAM记忆散布在系统中的不同存储位置。处理所有情况很快就变得很棘手，尤其是当用户声明自定义RAM部分时。启动脚本负责设置默认值（.DATA和.BSS），而其他自定义部分可能不会填充默认值，这导致带有INIT值的变量不会产生任何效果。
要独立于此问题，请为每个模块创建INIT函数，并使用它为所有变量设置默认值，例如：
static int32_t a ; /* OK */
static int32_t b = 4 ; /* Wrong - this value may not be set at zero
if linker script&startup files are not properly handled */
void
my_module_init ( void ) {
a = 0 ;
b = 4 ;
} void
my_func ( void ) {
/* 1 */
char a ; /* OK */
/* 2 */
char a , b ; /* OK */
/* 3 */
char a ;
char b ; /* Wrong, variable with char type already exists */
} int
my_func ( void ) {
/* 1 */
my_struct_t my ; /* First custom structures */
my_struct_ptr_t * p ; /* Pointers too */
/* 2 */
uint32_t a ;
int32_t b ;
uint16_t c ;
int16_t g ;
char h ;
/* ... */
/* 3 */
double d ;
float f ;
} typedef struct {
int a , b ;
} str_t ;
str_t s = {
. a = 1 ,
. b = 2 , /* Comma here */
}
/* Examples of "complex" structure, with or with missing several trailing commas, after clang-format runs the formatting */
static const my_struct_t my_var_1 = {
. type = TYPE1 ,
. type_data =
{
. type1 =
{
. par1 = 0 ,
. par2 = 1 , /* Trailing comma here */
}, /* Trailing comma here */
}, /* Trailing comma here */
};
static const my_struct_t my_var_2 = {. type = TYPE2 ,
. type_data = {
. type2 =
{
. par1 = 0 ,
. par2 = 1 ,
},
}}; /* Missing comma here */
static const my_struct_t my_var_3 = {. type = TYPE3 ,
. type_data = {. type3 = {
. par1 = 0 ,
. par2 = 1 ,
}}}; /* Missing 2 commas here */
/* No trailing commas - good only for small and simple structures */
static const my_struct_t my_var_4 = {. type = TYPE4 , . type_data = {. type4 = {. par1 = 0 , . par2 = 1 }}};for循环 /* OK */
for ( size_t i = 0 ; i < 10 ; ++ i )
/* OK, if you need counter variable later */
size_t i ;
for ( i = 0 ; i < 10 ; ++ i ) {
if (...) {
break ;
}
}
if ( i == 10 ) {
}
/* Wrong */
size_t i ;
for ( i = 0 ; i < 10 ; ++ i ) ... void
a ( void ) {
/* Avoid function calls when declaring variable */
int32_t a , b = sum ( 1 , 2 );
/* Use this */
int32_t a , b ;
b = sum ( 1 , 2 );
/* This is ok */
uint8_t a = 3 , b = 4 ;
}char ， float或double ，始终使用stdint.h库中声明的类型，例如。 uint8_t用于unsigned 8-bit ，等等。stdbool.h库。分别使用1或0进行true或false /* OK */
uint8_t status ;
status = 0 ;
/* Wrong */
#include <stdbool.h>
bool status = true;true相比，例如。 if (check_func() == 1) ，请使用if (check_func()) { ... }NULL价值进行比较 void * ptr ;
/* ... */
/* OK, compare against NULL */
if ( ptr == NULL || ptr != NULL ) {
}
/* Wrong */
if ( ptr || ! ptr ) {
} int32_t a = 0 ;
...
a ++ ; /* Wrong */
++ a ; /* OK */
for ( size_t j = 0 ; j < 10 ; ++ j ) {} /* OK */size_t用于长度或尺寸变量pointer内存，请始终将const用于指针const用于函数参数或变量，如果不应该修改 /* When d could be modified, data pointed to by d could not be modified */
void
my_func ( const void * d ) {
}
/* When d and data pointed to by d both could not be modified */
void
my_func ( const void * const d ) {
}
/* Not REQUIRED, it is advised */
void
my_func ( const size_t len ) {
}
/* When d should not be modified inside function, only data pointed to by d could be modified */
void
my_func ( void * const d ) {
}void * ，请勿使用uint8_t * /*
* To send data, function should not modify memory pointed to by `data` variable
* thus `const` keyword is important
*
* To send generic data (or to write them to file)
* any type may be passed for data,
* thus use `void *`
*/
/* OK example */
void
send_data ( const void * data , size_t len ) { /* OK */
/* Do not cast `void *` or `const void *` */
const uint8_t * d = data ; /* Function handles proper type for internal usage */
}
void
send_data ( const void * data , int len ) { /* Wrong, not not use int */
}sizeof操作员使用malloc和free功能，或者图书馆/项目提供自定义内存分配，请使用其实现 /* OK */
#include <stdlib.h>
void
my_func ( size_t size ) {
int32_t * arr ;
arr = malloc ( sizeof ( * arr ) * n ); /* OK, Allocate memory */
arr = malloc ( sizeof * arr * n ); /* Wrong, brackets for sizeof operator are missing */
if ( arr == NULL ) {
/* FAIL, no memory */
}
free ( arr ); /* Free memory after usage */
}
/* Wrong */
void
my_func ( size_t size ) {
int32_t arr [ size ]; /* Wrong, do not use VLA */
}boolean类型boolean-treated变量与零或一个比较。不使用（ ! ） size_t length = 5 ; /* Counter variable */
uint8_t is_ok = 0 ; /* Boolean-treated variable */
if ( length ) /* Wrong, length is not treated as boolean */
if ( length > 0 ) /* OK, length is treated as counter variable containing multi values, not only 0 or 1 */
if ( length == 0 ) /* OK, length is treated as counter variable containing multi values, not only 0 or 1 */
if ( is_ok ) /* OK, variable is treated as boolean */
if (! is_ok ) /* OK, -||- */
if ( is_ok == 1 ) /* Wrong, never compare boolean variable against 1! */
if ( is_ok == 0 ) /* Wrong, use ! for negative check *//* comment */进行评论，即使用于单行评论extern关键字的C++的检查staticforce_redraw 。不要使用forceRedrawvoid * ，例如。 uint8_t* ptr = (uint8_t *)func_returning_void_ptr();由于void *安全地晋升为任何其他指针类型uint8_t* ptr = func_returning_void_ptr();反而<和>用于C标准库包括文件，例如。 #include <stdlib.h>""用于自定义库，例如。 #include "my_library.h"uint8_t* t = (uint8_t*)var_width_diff_type//开头的评论不允许。始终使用/* comment */ ，即使用于单行评论 //This is comment (wrong)
/* This is comment (ok) */space+asterisk /*
* This is multi-line comments,
* written in 2 lines (ok)
*/
/**
* Wrong, use double-asterisk only for doxygen documentation
*/
/*
* Single line comment without space before asterisk (wrong)
*/
/*
* Single line comment in multi-line configuration (wrong)
*/
/* Single line comment (ok) */12凹痕（ 12 * 4空格）偏移。如果语句大于12凹痕，请评论4-spaces （以下示例）与下一个可用缩进 void
my_func ( void ) {
char a , b ;
a = call_func_returning_char_a ( a ); /* This is comment with 12*4 spaces indent from beginning of line */
b = call_func_returning_char_a_but_func_name_is_very_long ( a ); /* This is comment, aligned to 4-spaces indent */
}_角色分开 /* OK */
void my_func ( void );
void myfunc ( void );
/* Wrong */
void MYFunc ( void );
void myFunc (); /* OK */
const char * my_func ( void );
my_struct_t * my_func ( int32_t a , int32_t b );
/* Wrong */
const char * my_func ( void );
my_struct_t * my_func ( void ); /* OK, function names aligned */
void set ( int32_t a );
my_type_t get ( void );
my_ptr_t * get_ptr ( void );
/* Wrong */
void set ( int32_t a );
const char * get ( void ); /* OK */
int32_t
foo ( void ) {
return 0 ;
}
/* OK */
static const char *
get_string ( void ) {
return "Hello world!rn" ;
}
/* Wrong */
int32_t foo ( void ) {
return 0 ;
}_字符制作可变名称。 /* OK */
int32_t a ;
int32_t my_var ;
int32_t myvar ;
/* Wrong */
int32_t A ;
int32_t myVar ;
int32_t MYVar ;type组合本地变量 void
foo ( void ) {
int32_t a , b ; /* OK */
char a ;
char b ; /* Wrong, char type already exists */
} void
foo ( void ) {
int32_t a ;
a = bar ();
int32_t b ; /* Wrong, there is already executable statement */
} int32_t a , b ;
a = foo ();
if ( a ) {
int32_t c , d ; /* OK, c and d are in if-statement scope */
c = foo ();
int32_t e ; /* Wrong, there was already executable statement inside block */
} /* OK */
char * a ;
/* Wrong */
char * a ;
char * a ; /* OK */
char * p , * n ;_字符之间的字符typedef关键字声明结构时，它可能会使用3不同选项之一：
_t后缀。 struct struct_name {
char * a ;
char b ;
};_t后缀。 typedef struct {
char * a ;
char b ;
} struct_name_t ;_t ，并且必须在其typedef零件的名称后包含_t后缀。 typedef struct struct_name { /* No _t */
char * a ;
char b ;
char c ;
} struct_name_t ; /* _t */不良声明及其建议更正的例子
/* a and b MUST be separated to 2 lines */
/* Name of structure with typedef MUST include _t suffix */
typedef struct {
int32_t a , b ;
} a ;
/* Corrected version */
typedef struct {
int32_t a ;
int32_t b ;
} a_t ;
/* Wrong name, it MUST not include _t suffix */
struct name_t {
int32_t a ;
int32_t b ;
};
/* Wrong parameters, MUST be all uppercase */
typedef enum {
MY_ENUM_TESTA ,
my_enum_testb ,
} my_enum_t ;C99初始化样式 /* OK */
a_t a = {
. a = 4 ,
. b = 5 ,
};
/* Wrong */
a_t a = { 1 , 2 };_fn后缀 /* Function accepts 2 parameters and returns uint8_t */
/* Name of typedef has `_fn` suffix */
typedef uint8_t ( * my_func_typedef_fn )( uint8_t p1 , const char * p2 );1嵌套语句1凹痕大小 /* OK */
if ( c ) {
do_a ();
} else {
do_b ();
}
/* Wrong */
if ( c )
do_a ();
else
do_b ();
/* Wrong */
if ( c ) do_a ();
else do_b ();if或if-else-if语句， else必须与关闭第一语句的括号相同 /* OK */
if ( a ) {
} else if ( b ) {
} else {
}
/* Wrong */
if ( a ) {
}
else {
}
/* Wrong */
if ( a ) {
}
else
{
}do-while语句， while部分必须与do部分的括号相同 /* OK */
do {
int32_t a ;
a = do_a ();
do_b ( a );
} while ( check ());
/* Wrong */
do
{
/* ... */
} while ( check ());
/* Wrong */
do {
/* ... */
}
while ( check ()); if ( a ) {
do_a ();
} else {
do_b ();
if ( c ) {
do_c ();
}
} if ( a ) do_b ();
else do_c ();
if ( a ) do_a (); else do_b ();while ， do-while或for循环必须包括括号 /* OK */
while ( is_register_bit_set ()) {}
/* Wrong */
while ( is_register_bit_set ());
while ( is_register_bit_set ()) { }
while ( is_register_bit_set ()) {
}while （或do-while等） for空（在嵌入式编程中可能是这种情况），请使用空的单线支架 /* Wait for bit to be set in embedded hardware unit */
volatile uint32_t * addr = HW_PERIPH_REGISTER_ADDR ;
/* Wait bit 13 to be ready */
while ( * addr & ( 1 << 13 )) {} /* OK, empty loop contains no spaces inside curly brackets */
while ( * addr & ( 1 << 13 )) { } /* Wrong */
while ( * addr & ( 1 << 13 )) { /* Wrong */
}
while ( * addr & ( 1 << 13 )); /* Wrong, curly brackets are missing. Can lead to compiler warnings or unintentional bugs */for ， do-while ， while /* Not recommended */
int32_t a = 0 ;
while ( a < 10 ) {
.
..
...
++ a ;
}
/* Better */
for ( size_t a = 0 ; a < 10 ; ++ a ) {
}
/* Better, if inc may not happen in every cycle */
for ( size_t a = 0 ; a < 10 ; ) {
if (...) {
++ a ;
}
}if语句只能用于分配或功能调用操作 /* OK */
int a = condition ? if_yes : if_no ; /* Assignment */
func_call ( condition ? if_yes : if_no ); /* Function call */
switch ( condition ? if_yes : if_no ) {...} /* OK */
/* Wrong, this code is not well maintenable */
condition ? call_to_function_a () : call_to_function_b ();
/* Rework to have better program flow */
if ( condition ) {
call_to_function_a ();
} else {
call_to_function_b ();
}case语句添加单个缩进case或default语句中使用其他单个缩进来进行break语句 /* OK, every case has single indent */
/* OK, every break has additional indent */
switch ( check ()) {
case 0 :
do_a ();
break ;
case 1 :
do_b ();
break ;
default :
break ;
}
/* Wrong, case indent missing */
switch ( check ()) {
case 0 :
do_a ();
break ;
case 1 :
do_b ();
break ;
default :
break ;
}
/* Wrong */
switch ( check ()) {
case 0 :
do_a ();
break ; /* Wrong, break MUST have indent as it is under case */
case 1 :
do_b (); /* Wrong, indent under case is missing */
break ;
default :
break ;
}default语句 /* OK */
switch ( var ) {
case 0 :
do_job ();
break ;
default :
break ;
}
/* Wrong, default is missing */
switch ( var ) {
case 0 :
do_job ();
break ;
}break语句放入其中。case语句放在同一条线上 switch ( a ) {
/* OK */
case 0 : {
int32_t a , b ;
char c ;
a = 5 ;
/* ... */
break ;
}
/* Wrong */
case 1 :
{
int32_t a ;
break ;
}
/* Wrong, break shall be inside */
case 2 : {
int32_t a ;
}
break ;
}_角色，除非它们被明确标记为函数，这可能是将来用常规函数语法代替的功能 /* OK */
#define SQUARE ( x ) ((x) * (x))
/* Wrong */
#define square ( x ) ((x) * (x)) /* OK */
#define MIN ( x , y ) ((x) < (y) ? (x) : (y))
/* Wrong */
#define MIN ( x , y ) x < y ? x : y /* Wrong */
#define MIN ( x , y ) (x) < (y) ? (x) : (y)
#define SUM ( x , y ) (x) + (y)
/* Imagine result of this equation using wrong SUM implementation */
int32_t x = 5 * SUM ( 3 , 4 ); /* Expected result is 5 * 7 = 35 */
int32_t x = 5 * ( 3 ) + ( 4 ); /* It is evaluated to this, final result = 19 which is not what we expect */
/* Correct implementation */
#define MIN ( x , y ) ((x) < (y) ? (x) : (y))
#define SUM ( x , y ) ((x) + (y))do {} while (0)保护这些语句 typedef struct {
int32_t px , py ;
} point_t ;
point_t p ; /* Define new point */
/* Wrong implementation */
/* Define macro to set point */
#define SET_POINT ( p , x , y ) (p)->px = (x); (p)->py = (y) /* 2 statements. Last one should not implement semicolon */
SET_POINT ( & p , 3 , 4 ); /* Set point to position 3, 4. This evaluates to... */
( & p ) -> px = ( 3 ); ( & p ) -> py = ( 4 ); /* ... to this. In this example this is not a problem. */
/* Consider this ugly code, however it is valid by C standard (not recommended) */
if ( a ) /* If a is true */
if ( b ) /* If b is true */
SET_POINT ( & p , 3 , 4 ); /* Set point to x = 3, y = 4 */
else
SET_POINT ( & p , 5 , 6 ); /* Set point to x = 5, y = 6 */
/* Evaluates to code below. Do you see the problem? */
if ( a )
if ( b )
( & p ) -> px = ( 3 ); ( & p ) -> py = ( 4 );
else
( & p ) -> px = ( 5 ); ( & p ) -> py = ( 6 );
/* Or if we rewrite it a little */
if ( a )
if ( b )
( & p ) -> px = ( 3 );
( & p ) -> py = ( 4 );
else
( & p ) -> px = ( 5 );
( & p ) -> py = ( 6 );
/*
* Ask yourself a question: To which `if` statement does the `else` keyword belong?
*
* Based on first part of code, answer is straight-forward. To inner `if` statement when we check `b` condition
* Actual answer: Compilation error as `else` belongs nowhere
*/
/* Better and correct implementation of macro */
#define SET_POINT ( p , x , y ) do { (p)->px = (x); (p)->py = (y); } while (0) /* 2 statements. No semicolon after while loop */
/* Or even better */
#define SET_POINT ( p , x , y ) do { /* Backslash indicates statement continues in new line */
( p ) -> px = ( x );
( p ) -> py = ( y );
} while ( 0 ) /* 2 statements. No semicolon after while loop */
/* Now original code evaluates to */
if ( a )
if ( b )
do { ( & p ) -> px = ( 3 ); ( & p ) -> py = ( 4 ); } while ( 0 );
else
do { ( & p ) -> px = ( 5 ); ( & p ) -> py = ( 6 ); } while ( 0 );
/* Every part of `if` or `else` contains only `1` inner statement (do-while), hence this is valid evaluation */
/* To make code perfect, use brackets for every if-ifelse-else statements */
if ( a ) { /* If a is true */
if ( b ) { /* If b is true */
SET_POINT ( & p , 3 , 4 ); /* Set point to x = 3, y = 4 */
} else {
SET_POINT ( & p , 5 , 6 ); /* Set point to x = 5, y = 6 */
}
}#ifdef或#ifndef 。使用defined()或!defined() #ifdef XYZ
/* do something */
#endif /* XYZ */if/elif/else/endif语句 /* OK */
#if defined( XYZ )
/* Do if XYZ defined */
#else /* defined(XYZ) */
/* Do if XYZ not defined */
#endif /* !defined(XYZ) */
/* Wrong */
#if defined( XYZ )
/* Do if XYZ defined */
#else
/* Do if XYZ not defined */
#endif#if语句中的子语句 /* OK */
#if defined( XYZ )
#if defined( ABC )
/* do when ABC defined */
#endif /* defined(ABC) */
#else /* defined(XYZ) */
/* Do when XYZ not defined */
#endif /* !defined(XYZ) */
/* Wrong */
#if defined( XYZ )
#if defined( ABC )
/* do when ABC defined */
#endif /* defined(ABC) */
#else /* defined(XYZ) */
/* Do when XYZ not defined */
#endif /* !defined(XYZ) */ 记录的代码允许Doxygen解析并生成HTML/PDF/latex输出，因此在项目的早期阶段正确执行它非常重要。
variables ， functions和structures/enumerations@5x4空格（ 5选项卡）偏移量 /**
* brief Holds pointer to first entry in linked list
* Beginning of this text is 5 tabs (20 spaces) from beginning of line
*/
static
type_t * list ; /**
* brief This is point struct
* note This structure is used to calculate all point
* related stuff
*/
typedef struct {
int32_t x ; /*!< Point X coordinate */
int32_t y ; /*!< Point Y coordinate */
int32_t size ; /*!< Point size.
Since comment is very big,
you may go to next line */
} point_t ;
/**
* brief Point color enumeration
*/
typedef enum {
COLOR_RED , /*!< Red color */
COLOR_GREEN , /*!< Green color */
COLOR_BLUE , /*!< Blue color */
} point_color_t ;brief和所有参数文档in为输入和out ，都必须注意每个参数return参数，如果它返回某些内容。这不适用于void功能note或warning:在参数名称及其描述之间 /**
* brief Sum `2` numbers
* param[in] a: First number
* param[in] b: Second number
* return Sum of input values
*/
int32_t
sum ( int32_t a , int32_t b ) {
return a + b ;
}
/**
* brief Sum `2` numbers and write it to pointer
* note This function does not return value, it stores it to pointer instead
* param[in] a: First number
* param[in] b: Second number
* param[out] result: Output variable used to save result
*/
void
void_sum ( int32_t a , int32_t b , int32_t * result ) {
* result = a + b ;
}ref关键字指定哪个 /**
* brief My enumeration
*/
typedef enum {
MY_ERR , /*!< Error value */
MY_OK /*!< OK value */
} my_enum_t ;
/**
* brief Check some value
* return ref MY_OK on success, member of ref my_enum_t otherwise
*/
my_enum_t
check_value ( void ) {
return MY_OK ;
}NULL ）作为常量或数字 /**
* brief Get data from input array
* param[in] in: Input data
* return Pointer to output data on success, `NULL` otherwise
*/
const void *
get_data ( const void * in ) {
return in ;
}hideinitializer doxygen命令 /**
* brief Get minimal value between `x` and `y`
* param[in] x: First value
* param[in] y: Second value
* return Minimal value between `x` and `y`
* hideinitializer
*/
#define MIN ( x , y ) ((x) < (y) ? (x) : (y))file的doxygen注释和brief描述，然后是空行（使用doxygen时） /**
* file template.h
* brief Template include file
*/
/* Here is empty line */ /**
* file template.h
* brief Template include file
*/
/*
* Copyright (c) year FirstName LASTNAME
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without restriction,
* including without limitation the rights to use, copy, modify, merge,
* publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
* AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* This file is part of library_name.
*
* Author: FirstName LASTNAME <[email protected]>
*/#ifndefC++检查C++检查外包含外部标头文件extern用于标题文件中的全局模块变量，以后在源文件中定义它们 /* file.h ... */
#ifndef ...
extern int32_t my_variable; /* This is global variable declaration in header */
#endif
/* file.c ... */
int32_t my_variable; /* Actually defined in source */
切勿将.c文件包含在另一个.c文件中
.c文件应首先包括相应的.h文件，后来其他文件，除非另有明确的必要
请勿在标题文件中包含模块私人声明
标题文件示例（为了示例没有许可证）
/* License comes here */
#ifndef TEMPLATE_HDR_H
#define TEMPLATE_HDR_H
/* Include headers */
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
/* File content here */
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* TEMPLATE_HDR_H */ 存储库带有始终到日期的.clang-format文件，这是clang-format工具的输入配置。它可以与包括VSCODE在内的大多数最新技术IDE无缝集成。然后格式化在每个文件保存的位置上发生。
https://code.visualstudio.com/docs/cpp/cpp-ide#_code-formatting
ASTYLE是一个很棒的软件，可以根据输入配置有助于格式化代码。
该存储库包含astyle-code-format.cfg文件，可与AStyle软件一起使用。
astyle --options="astyle-code-format.cfg" "input_path/*.c,*.h" "input_path2/*.c,*.h"
艺术风格的配置已过时，不再更新
存储库包含eclipse-ext-kr-format.xml文件，可以与基于Eclipse的工具链一起使用以设置格式化选项。
它基于具有修改的K＆R格式化，以尊重上述规则。您可以在Eclipse设置， Preferences -> LANGUAGE -> Code Style -> Formatter选项卡中导入它。
