diff --git a/demo/std/src/demo_std.c b/demo/std/src/demo_std.c
index 3bb33f6..9020fc9 100644
--- a/demo/std/src/demo_std.c
+++ b/demo/std/src/demo_std.c
@@ -54,7 +54,7 @@ void STD_TestTask()
         Trace(1,"atox:%d",d);
 
         float e = atof("123.456");
-        Trace(1,"atof:%d.%d",(int)(e),(int)(e*1000%1000));
+        Trace(1,"atof:%d.%d",(int)(e),((int)(e*1000)%1000));
 
         char* string = "-12345 stop here";
         char* stopString = NULL;
@@ -77,6 +77,12 @@ void STD_TestTask()
         item = bsearch(&key,num,10,sizeof(int),cmp);
         Trace(1,"item:%d",*item);
 
+        int read0,read1;
+        // sscanf("123 456","%d %d",&read0,&read1);//error!!!
+        sscanf("123","%d",&read0);
+        sscanf("456","%d",&read1);
+        Trace(1,"read0:%d, read1:%d",read0,read1);
+
         
         OS_Sleep(3000);
     }
diff --git a/include/sdk_init.h b/include/sdk_init.h
index 0e539ca..67be8d8 100644
--- a/include/sdk_init.h
+++ b/include/sdk_init.h
@@ -208,6 +208,14 @@ typedef struct T_INTERFACE_VTBL_TAG
 
     //std
     int                 (*sscanf)(const char * buf, const char * fmt, ...);
+    long                (*atol)(const char *s);
+    long long           (*atoll)(const char *s);
+    int                 (*atox)(const char *s, int len);
+    double              (*atof)(const char *s);
+    unsigned char*      (*itoa)(int value, char *str, int radix);
+    char*               (*gcvt)(double value, int ndigit, char *buf);
+    int                 (*rand) (void);
+    void                (*srand)(unsigned int seed);
 
     //ssl
     SSL_Error_t         (*SSL_Init)(SSL_Config_t* sslConfig);
diff --git a/include/std_inc/stdio.h b/include/std_inc/stdio.h
index 54b87ba..22b5ed9 100644
--- a/include/std_inc/stdio.h
+++ b/include/std_inc/stdio.h
@@ -8,10 +8,13 @@ extern "C" {
 
 #include "stddef.h"
 #include <stdarg.h>
+#include "sdk_init.h"
 
 int sprintf(char * buf, const char *fmt, ...);
 int snprintf(char * buf, size_t len, const char *fmt, ...);
-int sscanf(const char * buf, const char * fmt, ...);
+
+#define  sscanf        CSDK_FUNC(sscanf)
+
 int vsprintf(char *buf, const char *fmt, va_list ap);
 int vsnprintf(char *buf, size_t size, const char *fmt, va_list ap);
 int vsscanf (const char *fp, const char *fmt0, va_list ap);
diff --git a/include/std_inc/stdlib.h b/include/std_inc/stdlib.h
index e0a19da..3a1b3a9 100644
--- a/include/std_inc/stdlib.h
+++ b/include/std_inc/stdlib.h
@@ -7,16 +7,17 @@ extern "C" {
 
 #include "cs_types.h"
 #include "stddef.h"
+#include "sdk_init.h"
 
 /* Standard atoi() function. Work as the libc one. */
 int          atoi(const char *s);
-long         atol(const char *s);
-long long    atoll(const char *s);
-int          atox(const char *s, int len);
-double       atof(const char *s);
 
-unsigned char* itoa(int value, char *str, int radix);
-char*          gcvt(double value, int ndigit, char *buf);
+#define  atol        CSDK_FUNC(atol)
+#define  atoll       CSDK_FUNC(atoll)
+#define  atox        CSDK_FUNC(atox)
+#define  atof        CSDK_FUNC(atof)
+#define  itoa        CSDK_FUNC(itoa)
+#define  gcvt        CSDK_FUNC(gcvt)
 
 long          strtol(const char *nptr, char **endptr, int base);
 unsigned long strtoul(const char *nptr, char **endptr, int base);
@@ -24,9 +25,8 @@ unsigned long strtoul(const char *nptr, char **endptr, int base);
 /* Standard random functions, work as the libc ones. */
 #define RAND_MAX        32767
 
-int  rand (void);
-void srand(unsigned int seed);
-
+#define  rand         CSDK_FUNC(rand)
+#define  srand        CSDK_FUNC(srand)
 
 typedef INT STD_COMPAR_FUNC_T (const VOID*, const VOID*);