Add clang format

.clang-format

@@ -0,0 +1,110 @@
+# .clang-format
+---
+AlignAfterOpenBracket: Align
+AlignConsecutiveAssignments: false
+AlignConsecutiveDeclarations: false
+AlignEscapedNewlines: Left
+AlignOperands: true
+AlignTrailingComments: false
+AllowAllParametersOfDeclarationOnNextLine: false
+AllowShortBlocksOnASingleLine: false
+AllowShortCaseLabelsOnASingleLine: false
+AllowShortFunctionsOnASingleLine: None
+AllowShortIfStatementsOnASingleLine: false
+AllowShortLoopsOnASingleLine: false
+AlwaysBreakAfterDefinitionReturnType: None
+AlwaysBreakAfterReturnType: None
+AlwaysBreakBeforeMultilineStrings: false
+AlwaysBreakTemplateDeclarations: false
+BinPackArguments: true
+BinPackParameters: true
+BraceWrapping:
+  AfterControlStatement: false
+  AfterEnum: false
+  AfterFunction: true
+  AfterStruct: false
+  AfterUnion: false
+  AfterExternBlock: false
+  BeforeElse: false
+  IndentBraces: false
+  SplitEmptyFunction: true
+  SplitEmptyRecord: true
+BreakBeforeBinaryOperators: None
+BreakBeforeBraces: Custom
+BreakBeforeInheritanceComma: false
+BreakBeforeTernaryOperators: false
+BreakStringLiterals: false
+ColumnLimit: 80
+CommentPragmas: '^ IWYU pragma:'
+ContinuationIndentWidth: 8
+DerivePointerAlignment: false
+DisableFormat: false
+ExperimentalAutoDetectBinPacking: false
+ForEachMacros:
+  - SLIST_FOREACH
+  - SLIST_FOREACH_FROM
+  - SLIST_FOREACH_FROM_SAFE
+  - SLIST_FOREACH_SAFE
+  - SLIST_FOREACH_PREVPTR
+  - SPLAY_FOREACH
+  - LIST_FOREACH
+  - LIST_FOREACH_FROM
+  - LIST_FOREACH_FROM_SAFE
+  - LIST_FOREACH_SAFE
+  - STAILQ_FOREACH
+  - STAILQ_FOREACH_FROM
+  - STAILQ_FOREACH_FROM_SAFE
+  - STAILQ_FOREACH_SAFE
+  - TAILQ_FOREACH
+  - TAILQ_FOREACH_FROM
+  - TAILQ_FOREACH_FROM_SAFE
+  - TAILQ_FOREACH_REVERSE
+  - TAILQ_FOREACH_REVERSE_FROM
+  - TAILQ_FOREACH_REVERSE_FROM_SAFE
+  - TAILQ_FOREACH_REVERSE_SAFE
+  - TAILQ_FOREACH_SAFE
+IncludeBlocks: Preserve
+IncludeCategories:
+  - Regex: '.*'
+    Priority: 1
+IncludeIsMainRegex: '(Test)?$'
+IndentCaseLabels: false
+IndentGotoLabels: false
+IndentPPDirectives: None
+IndentWidth: 8
+IndentWrappedFunctionNames: false
+KeepEmptyLinesAtTheStartOfBlocks: false
+MacroBlockBegin: ''
+MacroBlockEnd: ''
+MaxEmptyLinesToKeep: 1
+
+# Taken from git's rules
+PenaltyBreakAssignment: 10
+PenaltyBreakBeforeFirstCallParameter: 30
+PenaltyBreakComment: 10
+PenaltyBreakFirstLessLess: 0
+PenaltyBreakString: 10
+PenaltyExcessCharacter: 100
+PenaltyReturnTypeOnItsOwnLine: 60
+
+PointerAlignment: Right
+ReflowComments: false
+SortIncludes: false
+SortUsingDeclarations: false
+SpaceAfterCStyleCast: false
+SpaceAfterTemplateKeyword: true
+SpaceBeforeAssignmentOperators: true
+SpaceBeforeCtorInitializerColon: true
+SpaceBeforeInheritanceColon: true
+SpaceBeforeParens: ControlStatementsExceptForEachMacros
+SpaceBeforeRangeBasedForLoopColon: true
+SpaceInEmptyParentheses: false
+SpacesBeforeTrailingComments: 1
+SpacesInAngles: false
+SpacesInContainerLiterals: false
+SpacesInCStyleCastParentheses: false
+SpacesInParentheses: false
+SpacesInSquareBrackets: false
+TabWidth: 8
+UseTab: Always
+...

.github/workflows/clang-format-ubuntu.yml

@@ -0,0 +1,14 @@
+name: clang_format_ubuntu
+
+on: [push, pull_request]
+
+jobs:
+
+  clang-format-ubuntu:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - uses: RafikFarhad/clang-format-github-action@master
+      with:
+        sources: "src/**/*.h,src/**/*.h.in,src/**/*.c"
+        style: file

STYLE-GUIDE.md

@@ -7,32 +7,10 @@ or fixes you might notice.
 
 ## C CODE
 
-The BSD Kernel Normal Form (KNF) style is used [1]. Basically, it is like
-K&R/LKML, but wrapped lines that are indented use 4 spaces. Here are the
-highlights.
-
-- no trailing whitespace
-- indented code use tabs (not line wrapped)
-- cuddle the braces (except for functions)
-- space after native statements and before paren (for/if/while/...)
-- no space between function and paren
-- pointer asterisk cuddles the variable, not the type
-
-```
-void foo(int c)
-{
-	int ret = 0;
-
-	if (c > 1000)
-		return;
-
-	while (c--) {
-		bar(c);
-		ret++;
-	}
-
-	return ret;
-}
+This project uses clang format to define the code style. To format code
+automatically, run the following command:
+```bash
+$ clang-format --style=file -i path/of/source/file
 ```
 
 ## COMMIT MESSAGES