Add clang-format configuration and reformat script.

.clang-format

@@ -0,0 +1,80 @@
+# clang-format configuration file. Intended for clang-format >= 14.
+#
+# For more information, see:
+#
+#   Documentation/process/clang-format.rst
+#   https://clang.llvm.org/docs/ClangFormat.html
+#   https://clang.llvm.org/docs/ClangFormatStyleOptions.html
+#
+---
+AlignAfterOpenBracket: AlwaysBreak
+AlignArrayOfStructures: None
+AlignConsecutiveAssignments: false
+AlignConsecutiveDeclarations: false
+AlignConsecutiveMacros: true
+AlignEscapedNewlines: Left
+AlignOperands: DontAlign
+AlignTrailingComments: true
+AllowAllArgumentsOnNextLine: false
+AllowAllParametersOfDeclarationOnNextLine: false
+AllowShortBlocksOnASingleLine: true
+AllowShortCaseLabelsOnASingleLine: false
+AllowShortFunctionsOnASingleLine: None
+AllowShortIfStatementsOnASingleLine: false
+AllowShortLoopsOnASingleLine: false
+AlwaysBreakAfterDefinitionReturnType: None
+AlwaysBreakAfterReturnType: None
+AlwaysBreakBeforeMultilineStrings: false
+AttributeMacros: ['ADDAPI', 'ADDCALL']
+BinPackArguments: false
+BinPackParameters: false
+BraceWrapping:
+  AfterControlStatement: false
+  AfterEnum: false
+  AfterFunction: true
+  AfterStruct: false
+  AfterUnion: false
+  BeforeElse: false
+  IndentBraces: false
+  SplitEmptyFunction: true
+  SplitEmptyRecord: true
+BreakBeforeBinaryOperators: None
+BreakBeforeBraces: Custom
+BreakBeforeTernaryOperators: false
+BreakStringLiterals: false
+ColumnLimit: 90
+ContinuationIndentWidth: 8
+DerivePointerAlignment: false
+DisableFormat: false
+ExperimentalAutoDetectBinPacking: false
+IncludeBlocks: Preserve
+IncludeCategories:
+  - Regex: '.*'
+    Priority: 1
+IndentCaseLabels: false
+IndentGotoLabels: false
+IndentPPDirectives: BeforeHash
+IndentWidth: 8
+IndentWrappedFunctionNames: false
+KeepEmptyLinesAtTheStartOfBlocks: false
+MaxEmptyLinesToKeep: 1
+PenaltyBreakAssignment: 0
+PenaltyBreakBeforeFirstCallParameter: 0
+PenaltyBreakOpenParenthesis: 0
+PenaltyExcessCharacter: 100
+PenaltyReturnTypeOnItsOwnLine: 1000
+PointerAlignment: Left
+ReflowComments: false
+SeparateDefinitionBlocks: Always
+SortIncludes: false
+SpaceAfterCStyleCast: true
+SpaceBeforeAssignmentOperators: true
+SpaceBeforeParens: ControlStatements
+SpaceInEmptyParentheses: false
+SpacesBeforeTrailingComments: 1
+SpacesInCStyleCastParentheses: false
+SpacesInParentheses: false
+SpacesInSquareBrackets: false
+TabWidth: 8
+UseTab: ForContinuationAndIndentation
+...

tools/reformat-source.sh

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+#!/bin/bash
+
+VERSION=`clang-format --version | grep -o '[^ ]*$' | cut -d '.' -f 1`
+if [ "$VERSION" -ge "14" ]; then
+    CLANG_FORMAT=clang-format
+elif clang-format-14 --version > /dev/null; then
+    CLANG_FORMAT=clang-format-14
+else
+    echo "clang-format version 14 or higher is required."
+    exit 1
+fi
+
+$CLANG_FORMAT \
+    -i \
+    --style=file \
+    host/libhackrf/src/*.{c,h} \
+    host/hackrf-tools/src/*.c \
+    firmware/{common,common/rad1o,hackrf_usb}/*.{c,h}