tools: use clang-format for style checking

Signed-off-by: Marcel Cornu <marcel.d.cornu@intel.com>

.clang-format

@@ -0,0 +1,46 @@
+# Copyright (c) 2024, Intel Corporation
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#
+#     * Redistributions of source code must retain the above copyright notice,
+#       this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above copyright
+#       notice, this list of conditions and the following disclaimer in the
+#       documentation and/or other materials provided with the distribution.
+#     * Neither the name of Intel Corporation nor the names of its contributors
+#       may be used to endorse or promote products derived from this software
+#       without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
+# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+BasedOnStyle: LLVM
+IndentWidth: 8
+Language: Cpp
+BreakBeforeBraces: Linux
+AllowShortIfStatementsOnASingleLine: false
+IndentCaseLabels: false
+UseTab: Never
+AlignConsecutiveMacros: true
+AlignTrailingComments: true
+AlwaysBreakAfterReturnType: All
+SortIncludes: false
+BreakBeforeInheritanceComma: true
+AllowAllParametersOfDeclarationOnNextLine: false
+BinPackParameters: true
+BinPackArguments: true
+ReflowComments: true
+ColumnLimit: 100
+Cpp11BracedListStyle: false
+MaxEmptyLinesToKeep: 1
+ContinuationIndentWidth: 8
+SpaceAfterCStyleCast: true

.clang-format-ignore

@@ -0,0 +1,2 @@
+include/aarch64_multibinary.h
+**/aarch64/*.h

CONTRIBUTING.md

@@ -25,10 +25,10 @@ patches, file issues, and ask questions on our [mailing list].
 
 ## Coding Style
 
-The coding style for ISA-L C code roughly follows linux kernel guidelines.  Use
-the included indent script to format C code.
+The coding style for ISA-L C code is roughly based on LLVM style with
+some customizations. Use the included format script to format C code.
 
-    ./tools/iindent your_files.c
+    ./tools/format.sh
 
 And use check format script before submitting.
 

tools/check_format.sh

@@ -3,12 +3,23 @@
 set -e
 rc=0
 verbose=0
-# NOTE: there is a bug in GNU indent command line parse where it says, that
-#       -il6 require numeric parameter. This is because it treat it like "-i"
-#       param. Here we pass -i8 which is default for linux code style and
-#       we use long parameter name for indent label.
-indent_args='-i8 -linux -l95 -cp1 -lps -ncs --indent-label6'
-function iver { printf "%03d%03d%03d%03d" $(echo "$@" | sed 's/^.* indent//; y/./ /'); }
+clang_format_min_version=18
+
+function clang_format_version() {
+    version_str=$($clang_format --version)
+    regex="[0-9]+"
+    if [[ $version_str =~ $regex ]]; then
+        major_version="${BASH_REMATCH[0]}"
+	echo $major_version
+    fi
+}
+
+# set clang-format binary if not set externally
+if [[ -z $CLANGFORMAT ]]; then
+    clang_format="clang-format"
+else
+    clang_format=$CLANGFORMAT
+fi
 
 while [ -n "$*" ]; do
     case "$1" in
@@ -29,26 +40,20 @@ if ! git rev-parse --is-inside-work-tree >& /dev/null; then
     exit 1
 fi
 
-# On FreeBSD we need to use gindent
-for indent_tool in indent gindent ''; do
-	if hash $indent_tool && [ $(iver $($indent_tool --version)) -ge $(iver 2.2.12) ]; then
-		break
-	fi
-done
-
-if [ -n "$indent_tool" ]; then
-    echo "Checking C files for coding style..."
-    for f in `git ls-files '*.c'`; do
+if [ $(clang_format_version) -ge $clang_format_min_version ]; then
+    echo "Checking C files for coding style (clang-format v$(clang_format_version))..."
+    for f in `git ls-files '*.[c|h]'`; do
 	[ "$verbose" -gt 0 ] && echo "checking style on $f"
-	if ! $indent_tool $indent_args -st $f | diff -q $f - >& /dev/null; then
+	if ! $clang_format -style=file --dry-run --Werror "$f" >/dev/null 2>&1; then
 	    echo "  File found with formatting issues: $f"
-	    [ "$verbose" -gt 0 ] 2> /dev/null && $indent_tool $indent_args -st $f | diff -u $f -
+	    [ "$verbose" -gt 0 ] && $clang_format -style=file --dry-run "$f"
 	    rc=1
 	fi
     done
-    [ "$rc" -gt 0 ] && echo "  Run ./tools/iindent on files"
+    [ "$rc" -gt 0 ] && echo "  Run ./tools/format.sh to fix formatting issues"
 else
-	echo "You do not have a recent indent installed so your code style is not being checked!"
+    echo "You do not have clang-format version ${clang_format_min_version}+" \
+	"installed so your code style is not being checked!"
 fi
 
 if hash grep; then
@@ -74,7 +79,7 @@ while read -r perm _res0 _res1 f; do
 	echo "  File found with permissions issue ($perm): $f"
 	rc=1
     fi
-done <<< $(git ls-files -s -- ':(exclude)*.sh' ':(exclude)*iindent')
+done <<< $(git ls-files -s -- ':(exclude)*.sh')
 
 echo "Checking script files for permissions..."
 while read -r perm _res0 _res1 f; do

tools/format.sh

@@ -0,0 +1,43 @@
+#!/usr/bin/env bash
+
+verbose=0
+clang_format_min_version=18
+
+function clang_format_version() {
+    version_str=$($clang_format --version)
+    regex="[0-9]+"
+    if [[ $version_str =~ $regex ]]; then
+        major_version="${BASH_REMATCH[0]}"
+        echo $major_version
+    fi
+}
+
+# set clang-format binary if not set externally
+if [[ -z $CLANGFORMAT ]]; then
+    clang_format="clang-format"
+else
+    clang_format=$CLANGFORMAT
+fi
+
+while [ -n "$*" ]; do
+    case "$1" in
+        -v )
+            verbose=1
+            shift
+            ;;
+        -h )
+            echo format.sh [-h -v]
+            exit 0
+            ;;
+    esac
+done
+
+if [ $(clang_format_version) -ge $clang_format_min_version ]; then
+    echo "Formatting files using clang-format v$(clang_format_version)..."
+    for f in `git ls-files '*.[c|h]'`; do
+        [ "$verbose" -gt 0 ] && echo "formatting $f"
+        $clang_format -style=file -i "$f"
+    done
+else
+    echo "clang-format version ${clang_format_min_version}+ is required!"
+fi

tools/iindent

@@ -1,2 +0,0 @@
-#!/bin/sh
-indent -linux -l95 -cp1 -lps -il6 -ncs "$@"