clang-format: add configuration file

Adds a configuration file to be used with clang-format. This file was
copied from the Linux kernel, but with the ForEachMacros updated for
OP-TEE.

Clang-format can help with formatting the code, but we are not
expecting follow it to the letter.

Signed-off-by: Jens Wiklander <[email protected]>
Acked-by: Jerome Forissier <[email protected]>
Acked-by: Clement Faure <[email protected]>

.clang-format

@@ -0,0 +1,150 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# clang-format configuration file. Intended for clang-format >= 11.
+#
+# This is not perfect, but should help in most cases.
+# Please note that the maintainers have the last word if there's
+# disagrement with this tool.
+#
+# For more information, see:
+#   https://clang.llvm.org/docs/ClangFormat.html
+#   https://clang.llvm.org/docs/ClangFormatStyleOptions.html
+#
+---
+AccessModifierOffset: -4
+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:
+  AfterClass: false
+  AfterControlStatement: false
+  AfterEnum: false
+  AfterFunction: true
+  AfterNamespace: true
+  AfterObjCDeclaration: false
+  AfterStruct: false
+  AfterUnion: false
+  AfterExternBlock: false
+  BeforeCatch: false
+  BeforeElse: false
+  IndentBraces: false
+  SplitEmptyFunction: true
+  SplitEmptyRecord: true
+  SplitEmptyNamespace: true
+BreakBeforeBinaryOperators: None
+BreakBeforeBraces: Custom
+BreakBeforeInheritanceComma: false
+BreakBeforeTernaryOperators: false
+BreakConstructorInitializersBeforeComma: false
+BreakConstructorInitializers: BeforeComma
+BreakAfterJavaFieldAnnotations: false
+BreakStringLiterals: false
+ColumnLimit: 80
+CommentPragmas: '^ IWYU pragma:'
+CompactNamespaces: false
+ConstructorInitializerAllOnOneLineOrOnePerLine: false
+ConstructorInitializerIndentWidth: 8
+ContinuationIndentWidth: 8
+Cpp11BracedListStyle: false
+DerivePointerAlignment: false
+DisableFormat: false
+ExperimentalAutoDetectBinPacking: false
+FixNamespaceComments: false
+
+# Taken from:
+# find lib core -name "*.h" -path '*/include/*' -print0 | xargs -0 grep -E -h \
+#         '^#define[[:blank:]]*[^[:blank:]]*(FOREACH|for_each)[^[:blank:]]' | \
+# sed \
+# -e "s,^#define[ \t]*\([^[:space:]]*for_each[^[:space:]]*\)(.*$,  - '\1',"  \
+# -e "s,^#define[ \t]*\([^[:space:]]*FOREACH[^[:space:]]*\)(.*$,  - '\1'," | \
+# LC_ALL=C sort -u
+ForEachMacros:
+  - 'CIRCLEQ_FOREACH'
+  - 'CIRCLEQ_FOREACH_REVERSE'
+  - 'LIST_FOREACH'
+  - 'LIST_FOREACH_SAFE'
+  - 'SCATTERED_ARRAY_FOREACH'
+  - 'SIMPLEQ_FOREACH'
+  - 'SLIST_FOREACH'
+  - 'SLIST_FOREACH_SAFE'
+  - 'STAILQ_FOREACH'
+  - 'STAILQ_FOREACH_SAFE'
+  - 'TAILQ_FOREACH'
+  - 'TAILQ_FOREACH_REVERSE'
+  - 'TAILQ_FOREACH_REVERSE_SAFE'
+  - 'TAILQ_FOREACH_SAFE'
+  - 'fdt_for_each_property_offset'
+  - 'fdt_for_each_subnode'
+  - 'for_each_dt_driver'
+  - 'for_each_early_ta'
+  - 'for_each_fip_sp'
+  - 'for_each_secure_partition'
+
+IncludeBlocks: Preserve
+IncludeCategories:
+  - Regex: '.*'
+    Priority: 1
+IncludeIsMainRegex: '(Test)?$'
+IndentCaseLabels: false
+IndentGotoLabels: false
+IndentPPDirectives: None
+IndentWidth: 8
+IndentWrappedFunctionNames: false
+JavaScriptQuotes: Leave
+JavaScriptWrapImports: true
+KeepEmptyLinesAtTheStartOfBlocks: false
+MacroBlockBegin: ''
+MacroBlockEnd: ''
+MaxEmptyLinesToKeep: 1
+NamespaceIndentation: None
+ObjCBinPackProtocolList: Auto
+ObjCBlockIndentWidth: 8
+ObjCSpaceAfterProperty: true
+ObjCSpaceBeforeProtocolList: true
+
+# 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
+Standard: Cpp03
+TabWidth: 8
+UseTab: Always
+...