[os_env]: add os_env on Linux

git-svn-id: https://10.10.10.66:8443/svn/MediaProcessPlatform/trunk/mpp@31 6e48237b-75ef-9749-8fc9-41990f28c85a

osal/linux/os_env.c

@@ -0,0 +1,48 @@
+/*
+ * Copyright 2010 Rockchip Electronics S.LSI Co. LTD
+ *
+ * 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.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include "os_env.h"
+
+#define ENV_BUF_SIZE_WIN    1024
+
+RK_S32 os_get_env_u32(const char *name, RK_U32 *val)
+{
+    char *ptr = getenv(name);
+    *val = (RK_U32)atoi(ptr);
+    return 0;
+}
+
+RK_S32 os_get_env_str(const char *name, char **val)
+{
+    *val = getenv(name);
+    return (*val)?(0):(-1);
+}
+
+RK_S32 os_set_env_u32(const char *name, RK_U32 val)
+{
+    char buf[ENV_BUF_SIZE_WIN];
+    snprintf(buf, sizeof(buf), "%u", val);
+    return setenv(name, buf, 1);
+}
+
+RK_S32 os_set_env_str(const char *name, char *val)
+{
+    return setenv(name, val, 1);
+}
+
+