From 7d4cff7498ad20214fad58d2477370e1470ca3a4 Mon Sep 17 00:00:00 2001
From: Yunmi Ha <yunmi.ha@samsung.com>
Date: Mon, 18 Jan 2021 14:44:38 +0900
Subject: [PATCH] libcommon: add file-io library

Change-Id: Ifa68bfc79bb96ab11d3f69338abf4c80e80608ea
Signed-off-by: Yunmi Ha <yunmi.ha@samsung.com>
---
 CMakeLists.txt       |   1 +
 src/libcommon/file.h | 129 +++++++++++++++++++++++++++++++++++++++++++
 src/shared/log.h     |   2 +-
 3 files changed, 131 insertions(+), 1 deletion(-)
 create mode 100644 src/libcommon/file.h

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 33bf5f4..d314ee5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -24,6 +24,7 @@ SET(HEADERS
 	src/libsystemd/systemd-state.h
 	src/libcommon/list.h
 	src/libcommon/ini-parser.h
+	src/libcommon/file.h
 )
 
 # CHECK PKG
diff --git a/src/libcommon/file.h b/src/libcommon/file.h
new file mode 100644
index 0000000..1cd4dec
--- /dev/null
+++ b/src/libcommon/file.h
@@ -0,0 +1,129 @@
+/*
+ * Copyright (c) 2021 Samsung Electronics Co., Ltd All Rights Reserved
+ *
+ * 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.
+ */
+
+
+#ifndef __LIBCOMMON_FILE_H__
+#define __LIBCOMMON_FILE_H__
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#define SHARED_H_BUF_MAX 255
+
+static inline int sys_read_buf(char *file, char *buf, int len)
+{
+    int fd, r;
+
+    if (!file || !buf || len < 0)
+        return -EINVAL;
+
+    fd = open(file, O_RDONLY);
+    if (fd == -1)
+        return -ENOENT;
+
+    r = read(fd, buf, len);
+    close(fd);
+    if ((r >= 0) && (r < len))
+        buf[r] = '\0';
+    else
+        return -EIO;
+
+    return 0;
+}
+
+static inline int sys_write_buf(char *file, char *buf)
+{
+    int fd, r;
+
+    if (!file || !buf)
+        return -EINVAL;
+
+    fd = open(file, O_WRONLY);
+    if (fd == -1)
+        return -EPERM;
+
+    r = write(fd, buf, strlen(buf));
+    close(fd);
+    if (r < 0)
+        return -EIO;
+
+    return 0;
+}
+
+static inline int sys_get_int(char *fname, int *val)
+{
+    char buf[SHARED_H_BUF_MAX];
+    int r;
+
+    if (!fname || !val)
+        return -EINVAL;
+
+    r = sys_read_buf(fname, buf, sizeof(buf));
+    if (r < 0)
+        return r;
+
+    *val = atoi(buf);
+    return 0;
+}
+
+static inline int sys_get_str(char *fname, char *str, int len)
+{
+    int r;
+
+    if (!fname || !str || len < 0)
+        return -EINVAL;
+
+    r = sys_read_buf(fname, str, len);
+    if (r < 0)
+        return r;
+
+    return 0;
+}
+
+static inline int sys_set_int(char *fname, int val)
+{
+    char buf[SHARED_H_BUF_MAX];
+    int r;
+
+    if (!fname)
+        return -EINVAL;
+
+    snprintf(buf, sizeof(buf), "%d", val);
+    r = sys_write_buf(fname, buf);
+    if (r < 0)
+        return r;
+
+    return 0;
+}
+
+static inline int sys_set_str(char *fname, char *val)
+{
+    int r;
+
+    if (!fname || !val)
+        return -EINVAL;
+
+    r = sys_write_buf(fname, val);
+    if (r < 0)
+        return r;
+
+    return 0;
+}
+
+#endif /* __LIBCOMMON_FILE_H__ */
diff --git a/src/shared/log.h b/src/shared/log.h
index 4e9b338..ad914a3 100644
--- a/src/shared/log.h
+++ b/src/shared/log.h
@@ -24,7 +24,7 @@
 #define ENABLE_DLOG
 #endif
 
-#define LOG_TAG "LIBSYSTEM"
+#define LOG_TAG "LIBSYSCOMMON"
 #include "shared/log-macro.h"
 
 #endif
-- 
2.34.1