push

.clang-format

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+# SPDX-License-Identifier: GPL-2.0
+#
+# clang-format configuration file. Intended for clang-format >= 11.
+#
+# For more information, see:
+#
+#   Documentation/process/clang-format.rst
+#   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: 114514
+CommentPragmas: '^ IWYU pragma:'
+CompactNamespaces: false
+ConstructorInitializerAllOnOneLineOrOnePerLine: false
+ConstructorInitializerIndentWidth: 8
+ContinuationIndentWidth: 8
+Cpp11BracedListStyle: false
+DerivePointerAlignment: false
+DisableFormat: false
+ExperimentalAutoDetectBinPacking: false
+FixNamespaceComments: false
+
+
+ForEachMacros:
+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: true
+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

.gitignore

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+brctl.zip
+brctl

Makefile

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+all:
+	$(CC) -std=gnu99 -c -o libk2v.o src/k2v.c
+	ar -r libk2v.a libk2v.o
+	rm libk2v.o
+	$(CC) -fPIE -static -Wl,--gc-sections -fstack-protector-all -fstack-clash-protection -mshstk  -D_FORTIFY_SOURCE=3 -Wno-unused-result -O2 -std=gnu99 -Wno-gnu-zero-variadic-macro-arguments -L. -lk2v -o brctl src/brctl.c -z noexecstack -z now
+	strip brctl
+	rm libk2v.a
+	cp brctl module/
+	cd module&&zip -r ../brctl.zip .
+format:
+	clang-format -i src/*.c
+check:
+	clang-tidy --checks=*,-clang-analyzer-security.insecureAPI.strcpy,-altera-unroll-loops,-cert-err33-c,-concurrency-mt-unsafe,-clang-analyzer-security.insecureAPI.DeprecatedOrUnsafeBufferHandling,-readability-function-cognitive-complexity,-cppcoreguidelines-avoid-magic-numbers,-readability-magic-numbers,-bugprone-easily-swappable-parameters,-cert-err34-c,-misc-include-cleaner,-readability-identifier-length,-bugprone-signal-handler,-cert-msc54-cpp,-cert-sig30-c,-altera-id-dependent-backward-branch,-cppcoreguidelines-avoid-non-const-global-variables *.c --

module/META-INF/com/google/android/update-binary

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+#!/sbin/sh
+
+#################
+# Initialization
+#################
+
+umask 022
+
+# echo before loading util_functions
+ui_print() { echo "$1"; }
+
+require_new_magisk() {
+  ui_print "*******************************"
+  ui_print " Please install Magisk v20.4+! "
+  ui_print "*******************************"
+  exit 1
+}
+
+#########################
+# Load util_functions.sh
+#########################
+
+OUTFD=$2
+ZIPFILE=$3
+
+mount /data 2>/dev/null
+
+[ -f /data/adb/magisk/util_functions.sh ] || require_new_magisk
+. /data/adb/magisk/util_functions.sh
+[ $MAGISK_VER_CODE -lt 20400 ] && require_new_magisk
+
+install_module
+exit 0

module/META-INF/com/google/android/updater-script

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+#MAGISK

module/br.conf

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+# 注意：请将值用半角引号包裹
+#
+# 请设置为`ls /sys/class/backlight/`的输出内容
+panel="panel0-backlight"
+# 低亮度级别：0到30%
+low_max="30"
+# 中亮度级别：30%到60%
+mid_max="60"
+# 低亮度时，亮度增加到原来的1.5倍
+low_inc="1.5"
+# 中亮度时，亮度减小到原来的0.7倍
+mid_inc="0.7"
+# 高亮度时，亮度增加到原来的1.5倍
+hig_inc="1.5"
+# 每次增加亮度前的时间间隔，用于防止和自动亮度冲突引起的闪屏
+sleep_time="1"

module/module.prop

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+id=brctl
+name=brctl
+version=1
+versionCode=1
+author=Moe Hacker
+description=Auto brightness control

module/service.sh

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+MODDIR=${0%/*}
+chmod 777 /data/adb/modules/brctl/brctl
+/data/adb/modules/brctl/brctl &

src/brctl.c

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+#include <linux/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <linux/limits.h>
+#include <stdio.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <stdlib.h>
+#include <signal.h>
+#if __STDC_VERSION__ < 202000L
+#define bool _Bool
+#define true ((_Bool) + 1u)
+#define false ((_Bool) + 0u)
+#endif
+#include "include/k2v.h"
+struct CONFIG {
+	int low_max;
+	int mid_max;
+	float low_inc;
+	float mid_inc;
+	float hig_inc;
+	int sleep_time;
+	char *panel;
+} config = {
+	.low_max = 0,
+	.mid_max = 0,
+	.low_inc = 0,
+	.mid_inc = 0,
+	.hig_inc = 0,
+	.sleep_time = 0,
+	.panel = NULL,
+};
+void init_config(void)
+{
+	char *conf_file = "/data/adb/modules/brctl/br.conf";
+	char *buf = k2v_open_file(conf_file, 4096);
+	config.panel = key_get_char("panel", buf);
+	config.low_max = key_get_int("low_max", buf);
+	config.mid_max = key_get_int("mid_max", buf);
+	config.low_inc = key_get_float("low_inc", buf);
+	config.mid_inc = key_get_float("mid_inc", buf);
+	config.hig_inc = key_get_float("hig_inc", buf);
+	config.sleep_time = key_get_int("sleep_time", buf);
+	free(buf);
+}
+u_int ftoi(char *path)
+{
+	int fd = open(path, O_RDONLY);
+	if (fd < 0) {
+		exit(EXIT_FAILURE);
+	}
+	char buf[128] = { '\0' };
+	read(fd, buf, sizeof(buf));
+	return (u_int)atoi(buf);
+}
+void set_br(char *brctl_path, u_int br)
+{
+	int fd = open(brctl_path, O_RDWR);
+	if (fd < 0) {
+		exit(EXIT_FAILURE);
+	}
+	char buf[128] = { '\0' };
+	sprintf(buf, "%u\n", br);
+	write(fd, buf, strlen(buf));
+	close(fd);
+}
+u_int new_br(u_int cur_br, u_int max_br)
+{
+	u_int ret = cur_br;
+	int br_per = (int)(((float)cur_br / (float)max_br) * 100);
+	if (br_per < config.low_max) {
+		ret = (u_int)((float)cur_br * config.low_inc);
+		if (ret > max_br) {
+			ret = max_br;
+		}
+		return ret;
+	}
+	if (br_per < config.mid_max) {
+		ret = (u_int)((float)cur_br * config.mid_inc);
+		if (ret > max_br) {
+			ret = max_br;
+		}
+		return ret;
+	}
+	ret = (u_int)((float)cur_br * config.hig_inc);
+	if (ret > max_br) {
+		ret = max_br;
+	}
+	return ret;
+}
+void brctl_daemon()
+{
+	init_config();
+	char brctl_path[PATH_MAX] = { '\0' };
+	char brmax_path[PATH_MAX] = { '\0' };
+	sprintf(brctl_path, "/sys/class/backlight/%s/brightness", config.panel);
+	sprintf(brmax_path, "/sys/class/backlight/%s/max_brightness", config.panel);
+	u_int max_br = ftoi(brmax_path);
+	u_int cur_br = ftoi(brctl_path);
+	sigset_t sigs;
+	sigemptyset(&sigs);
+	sigaddset(&sigs, SIGTTIN);
+	sigaddset(&sigs, SIGTTOU);
+	sigprocmask(SIG_BLOCK, &sigs, 0);
+	u_int bk_br = cur_br;
+	while (true) {
+		cur_br = ftoi(brctl_path);
+		if (cur_br != bk_br) {
+			sleep(config.sleep_time);
+			cur_br = ftoi(brctl_path);
+			bk_br = new_br(cur_br, max_br);
+			set_br(brctl_path, bk_br);
+			fflush(stdout);
+		}
+		sleep(3);
+	}
+}
+int main(void)
+{
+	brctl_daemon();
+}

src/include/k2v.h

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+// SPDX-License-Identifier: MIT
+/*
+ *
+ * This file is part of libk2v, with ABSOLUTELY NO WARRANTY.
+ *
+ * MIT License
+ *
+ * Copyright (c) 2024 Moe-hacker
+ *
+ * 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.
+ *
+ *
+ */
+#include <stdio.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdlib.h>
+// Bool!!!
+#if __STDC_VERSION__ < 202000L
+#define bool _Bool
+#define true ((_Bool) + 1u)
+#define false ((_Bool) + 0u)
+#endif
+// Version info.
+#define LIBK2V_MAJOR 0
+#define LIBK2V_MINOR 1
+// Warning.
+extern bool k2v_stop_at_warning;
+extern bool k2v_show_warning;
+// Functions.
+char *key_get_char(const char *key, const char *buf);
+int key_get_int(const char *key, const char *buf);
+float key_get_float(const char *key, const char *buf);
+bool key_get_bool(const char *key, const char *buf);
+int key_get_int_array(const char *key, const char *buf, int *array);
+int key_get_char_array(const char *key, const char *buf, char *array[]);
+int key_get_float_array(const char *key, const char *buf, float *array);
+bool have_key(const char *key, const char *buf);
+char *k2v_open_file(char *path, size_t bufsize);
+void k2v_to_shell(const char *buf);