mt2: Provide global Huawei symbols via libc

Huawei included some non-standard functions in libcutils and liblog.
Make these functions globally available by including them in libc.

Parts of this commit originated from:
  libcutils/liblog: Add functions required by Huawei g620_a2 binaries
  Thomas Wendt
  I58604686008340ef4e10f3f67dc329fe7bd864cc

Change-Id: Ie3a84ce5b6b969ef4cc17b2028cc03298a43a79b

BoardConfig.mk

@@ -99,6 +99,9 @@ BOARD_MKBOOTIMG_ARGS := --ramdisk_offset 0x02000000
 TARGET_KERNEL_CONFIG := cyanogenmod_mt2_defconfig
 TARGET_KERNEL_SOURCE := kernel/huawei/msm8928
 
+# Libc extensions
+BOARD_PROVIDES_ADDITIONAL_BIONIC_STATIC_LIBS += libc_huawei_symbols
+
 # Lights
 TARGET_PROVIDES_LIBLIGHT := true
 

libc_huawei_symbols/Android.mk

@@ -0,0 +1,30 @@
+# Copyright (C) 2015 The CyanogenMod Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+LOCAL_PATH := $(call my-dir)
+include $(CLEAR_VARS)
+
+LOCAL_SRC_FILES := \
+    hw_cutils.c \
+    hw_log.c
+
+LOCAL_MODULE_PATH := $(TARGET_OUT_SHARED_LIBRARIES)
+LOCAL_MODULE := libc_huawei_symbols
+LOCAL_MODULE_TAGS := optional
+
+# Debugging (uncomment to enable)
+# LOCAL_CFLAGS += -DHW_LIBC_DEBUG
+# LOCAL_WHOLE_STATIC_LIBRARIES := liblog
+
+include $(BUILD_STATIC_LIBRARY)

libc_huawei_symbols/hw_cutils.c

@@ -0,0 +1,81 @@
+/*
+ * Copyright (C) 2015 The CyanogenMod Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifdef HW_LIBC_DEBUG
+#define LOG_TAG "HWAppInfo"
+#include <log/log.h>
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+/*
+ * References in kernel:
+ * fs/proc/app_info.c
+ * include/misc/app_info.h
+ */
+
+#define APP_INFO_PATH "/proc/app_info"
+#define APP_INFO_VALUE_LENGTH 32
+
+int get_app_info(char* key, char* value) {
+    char buf[128] = { 0 };
+    char* tok;
+    FILE* f;
+
+#ifdef HW_LIBC_DEBUG
+    ALOGI("Getting App Info for %s", key);
+#endif
+
+    if(key == NULL) {
+#ifdef HW_LIBC_DEBUG
+        ALOGE("Key is null");
+#endif
+        return -1;
+    }
+
+    f = fopen(APP_INFO_PATH, "rb");
+    if(f == NULL) {
+#ifdef HW_LIBC_DEBUG
+        ALOGE("Failed to open %s: %s", APP_INFO_PATH, strerror(errno));
+#endif
+        return -2;
+    }
+
+    while (!feof(f)) {
+        if (fgets(buf, 128, f) != NULL &&
+                strstr(buf, key) != NULL) {
+            tok = strchr(buf, ':');
+            if (tok != NULL)
+                tok = strtok(tok, ": ");
+            if (tok != NULL) {
+                snprintf(value, APP_INFO_VALUE_LENGTH, "%s", tok);
+                strtok(value, "\n");
+            }
+            break;
+        }
+    }
+
+    fclose(f);
+
+#ifdef HW_LIBC_DEBUG
+    ALOGI("%s=%s", key, value);
+#endif
+
+    return 0;
+}

libc_huawei_symbols/hw_log.c

@@ -0,0 +1,22 @@
+/*
+ * Copyright (C) 2015 The CyanogenMod Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+void __android_logPower_print(void) {
+}
+
+int isLogEnabled(void) {
+    return 0;
+}