diff --git a/libc/minilibc/ctype.c b/libc/minilibc/ctype.c
new file mode 100644
index 0000000000000000000000000000000000000000..8e02e1a904ff32a366a98f7625a4a224be3c6938
--- /dev/null
+++ b/libc/minilibc/ctype.c
@@ -0,0 +1,32 @@
+/*
+ * File      : ctype.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2008, RT-Thread Development Team
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rt-thread.org/license/LICENSE
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2008-08-14     Bernard      the first version
+ */
+
+#include <rtthread.h>
+#include <sys/types.h>
+
+#if !defined (RT_USING_NEWLIB) && defined (RT_USING_MINILIBC)
+#include "ctype.h"
+
+int isprint (int ch)
+{
+	ch&=0x7f;
+	return (ch>=32 && ch<127);
+}
+
+int isalpha(int ch)
+{
+	return (unsigned int)((ch | 0x20) - 'a') < 26u;
+}
+
+#endif
diff --git a/libc/minilibc/ctype.h b/libc/minilibc/ctype.h
new file mode 100644
index 0000000000000000000000000000000000000000..fdbf7bf003cfc2d786a61f837c07e8fb8ebf69da
--- /dev/null
+++ b/libc/minilibc/ctype.h
@@ -0,0 +1,20 @@
+/*
+ * File      : ctype.h
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2008, RT-Thread Development Team
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rt-thread.org/license/LICENSE
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2008-08-14     Bernard      the first version
+ */
+#ifndef __CTYPE_H__
+#define __CTYPE_H__
+
+int isprint(int c) __attribute__ ((__const__));
+int isalpha (int c) __attribute__ ((__const__));
+
+#endif
diff --git a/libc/minilibc/stddef.h b/libc/minilibc/stddef.h
new file mode 100644
index 0000000000000000000000000000000000000000..b260acf79ed1fe4431e471bac4fac499a9208e27
--- /dev/null
+++ b/libc/minilibc/stddef.h
@@ -0,0 +1,4 @@
+#ifndef __STDDEF_H__
+#define __STDDEF_H__
+
+#endif
diff --git a/libc/minilibc/stdlib.c b/libc/minilibc/stdlib.c
new file mode 100644
index 0000000000000000000000000000000000000000..7c14036351218241222f3fbef1cabdc563527127
--- /dev/null
+++ b/libc/minilibc/stdlib.c
@@ -0,0 +1,41 @@
+/*
+ * File      : stdlib.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2008, RT-Thread Development Team
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rt-thread.org/license/LICENSE
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2008-08-14     Bernard      the first version
+ */
+
+#include <rtthread.h>
+
+#if !defined (RT_USING_NEWLIB) && defined (RT_USING_MINILIBC)
+#include "stdlib.h"
+
+int errno = 0;
+int atoi(const char* s)
+{
+	long int v=0;
+	int sign=1;
+	while ( *s == ' '  ||  (unsigned int)(*s - 9) < 5u) s++;
+	switch (*s)
+	{
+	case '-':
+		sign=-1;
+	case '+':
+		++s;
+	}
+	while ((unsigned int) (*s - '0') < 10u)
+	{
+		v=v*10+*s-'0';
+		++s;
+	}
+	return sign==-1?-v:v;
+}
+
+#endif
diff --git a/libc/minilibc/stdlib.h b/libc/minilibc/stdlib.h
new file mode 100644
index 0000000000000000000000000000000000000000..c9061a7ab1325ad44b701a4506b62f1fd602fe0c
--- /dev/null
+++ b/libc/minilibc/stdlib.h
@@ -0,0 +1,22 @@
+/*
+ * File      : stdlib.h
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2008, RT-Thread Development Team
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rt-thread.org/license/LICENSE
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2008-08-14     Bernard      the first version
+ */
+
+#ifndef __STDLIB_H__
+#define __STDLIB_H__
+
+#if !defined (RT_USING_NEWLIB) && defined (RT_USING_MINILIBC)
+int atoi(const char *nptr);
+#endif
+
+#endif
diff --git a/libc/minilibc/string.c b/libc/minilibc/string.c
new file mode 100644
index 0000000000000000000000000000000000000000..be35afe526b8fbf9bd0fcad1f1b51c19c8a2165c
--- /dev/null
+++ b/libc/minilibc/string.c
@@ -0,0 +1,497 @@
+/*
+ * File      : string.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2008, RT-Thread Development Team
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rt-thread.org/license/LICENSE
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2008-08-14     Bernard      the first version
+ */
+
+#include <rtthread.h>
+
+#if !defined (RT_USING_NEWLIB) && defined (RT_USING_MINILIBC)
+#include "string.h"
+
+/* there is no strcpy and strcmp implementation in RT-Thread */
+char *strcpy(char *dest, const char *src)
+{
+	return rt_strncpy(dest, src, rt_strlen(src) + 1);
+}
+
+int strcmp (const char *s1, const char *s2)
+{
+	while (*s1 && *s1 == *s2)
+		s1++, s2++;
+	return (*s1 - *s2);
+}
+
+char* strcat(register char* s,register const char* t)
+{
+	char *dest = s;
+	
+	s += strlen(s);
+	for (;;) 
+	{
+		if (!(*s = *t)) break; 
+		++s; 
+		++t;
+	}
+	
+	return dest;
+}
+
+char *strncat(char *s, const char *t, size_t n) 
+{
+	char *dest = s;
+	register char *max;
+	
+	s += rt_strlen(s);
+	if ((max=s+n)==s)
+		goto fini;
+	for (;;) 
+	{
+		if (!(*s = *t)) break; 
+		if (++s==max) break; 
+		++t;
+	}
+	*s=0;
+fini:
+	return dest;
+}
+
+char *strrchr(const char *t, int c) 
+{
+	register char ch;
+	register const char *l=0;
+
+	ch = c;
+	for (;;) 
+	{
+		if (*t == ch) l=t; 
+		if (!*t) return (char*)l; 
+		++t;
+	}
+	
+	return (char*)l;
+}
+
+
+int  strncasecmp ( const char* s1, const char* s2, size_t len )
+{
+	register unsigned int  x2;
+	register unsigned int  x1;
+	register const char*   end = s1 + len;
+
+	while (1)
+	{
+		if ((s1 >= end) )
+			return 0;
+
+		x2 = *s2 - 'A'; if ((x2 < 26u)) x2 += 32;
+		x1 = *s1 - 'A'; if ((x1 < 26u)) x1 += 32;
+		s1++; s2++;
+
+		if ((x2 != x1))
+			break;
+
+		if ((x1 == (unsigned int)-'A'))
+			break;
+	}
+
+	return x1 - x2;
+}
+
+/* private function */
+#define isdigit(c)  ((unsigned)((c) - '0') < 10)
+
+rt_inline int divide(int *n, int base)
+{
+	rt_int32_t res;
+
+	/* optimized for processor which does not support divide instructions. */
+	if (base == 10)
+	{
+		res = ((int)*n) % 10U;
+		*n = ((int)*n) / 10U;
+	}
+	else
+	{
+		res = ((int)*n) % 16U;
+		*n = ((int)*n) / 16U;
+	}
+
+	return res;
+}
+
+rt_inline int skip_atoi(const char **s)
+{
+	register int i=0;
+	while (isdigit(**s)) i = i*10 + *((*s)++) - '0';
+
+	return i;
+}
+
+unsigned char _ctype[] = {
+_C,_C,_C,_C,_C,_C,_C,_C,			/* 0-7 */
+_C,_C|_S,_C|_S,_C|_S,_C|_S,_C|_S,_C,_C,		/* 8-15 */
+_C,_C,_C,_C,_C,_C,_C,_C,			/* 16-23 */
+_C,_C,_C,_C,_C,_C,_C,_C,			/* 24-31 */
+_S|_SP,_P,_P,_P,_P,_P,_P,_P,			/* 32-39 */
+_P,_P,_P,_P,_P,_P,_P,_P,			/* 40-47 */
+_D,_D,_D,_D,_D,_D,_D,_D,			/* 48-55 */
+_D,_D,_P,_P,_P,_P,_P,_P,			/* 56-63 */
+_P,_U|_X,_U|_X,_U|_X,_U|_X,_U|_X,_U|_X,_U,	/* 64-71 */
+_U,_U,_U,_U,_U,_U,_U,_U,			/* 72-79 */
+_U,_U,_U,_U,_U,_U,_U,_U,			/* 80-87 */
+_U,_U,_U,_P,_P,_P,_P,_P,			/* 88-95 */
+_P,_L|_X,_L|_X,_L|_X,_L|_X,_L|_X,_L|_X,_L,	/* 96-103 */
+_L,_L,_L,_L,_L,_L,_L,_L,			/* 104-111 */
+_L,_L,_L,_L,_L,_L,_L,_L,			/* 112-119 */
+_L,_L,_L,_P,_P,_P,_P,_C,			/* 120-127 */
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,		/* 128-143 */
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,		/* 144-159 */
+_S|_SP,_P,_P,_P,_P,_P,_P,_P,_P,_P,_P,_P,_P,_P,_P,_P,   /* 160-175 */
+_P,_P,_P,_P,_P,_P,_P,_P,_P,_P,_P,_P,_P,_P,_P,_P,       /* 176-191 */
+_U,_U,_U,_U,_U,_U,_U,_U,_U,_U,_U,_U,_U,_U,_U,_U,       /* 192-207 */
+_U,_U,_U,_U,_U,_U,_U,_P,_U,_U,_U,_U,_U,_U,_U,_L,       /* 208-223 */
+_L,_L,_L,_L,_L,_L,_L,_L,_L,_L,_L,_L,_L,_L,_L,_L,       /* 224-239 */
+_L,_L,_L,_L,_L,_L,_L,_P,_L,_L,_L,_L,_L,_L,_L,_L};      /* 240-255 */
+
+#define __ismask(x) (_ctype[(int)(unsigned char)(x)])
+
+#define isalnum(c)	((__ismask(c)&(_U|_L|_D)) != 0)
+#define isalpha(c)	((__ismask(c)&(_U|_L)) != 0)
+#define iscntrl(c)	((__ismask(c)&(_C)) != 0)
+#define isgraph(c)	((__ismask(c)&(_P|_U|_L|_D)) != 0)
+#define islower(c)	((__ismask(c)&(_L)) != 0)
+#define isprint(c)	((__ismask(c)&(_P|_U|_L|_D|_SP)) != 0)
+#define ispunct(c)	((__ismask(c)&(_P)) != 0)
+#define isspace(c)	((__ismask(c)&(_S)) != 0)
+#define isupper(c)	((__ismask(c)&(_U)) != 0)
+#define isxdigit(c)	((__ismask(c)&(_D|_X)) != 0)
+
+#define isascii(c) (((unsigned char)(c))<=0x7f)
+#define toascii(c) (((unsigned char)(c))&0x7f)
+
+static inline unsigned char __tolower(unsigned char c)
+{
+	if (isupper(c))
+		c -= 'A'-'a';
+	return c;
+}
+
+static inline unsigned char __toupper(unsigned char c)
+{
+	if (islower(c))
+		c -= 'a'-'A';
+	return c;
+}
+
+int tolower(int c) 
+{
+	return __tolower(c);
+}
+
+int toupper(int c)
+{
+	return __toupper(c);
+}
+
+/**
+ * simple_strtoul - convert a string to an unsigned long
+ * @cp: The start of the string
+ * @endp: A pointer to the end of the parsed string will be placed here
+ * @base: The number base to use
+ */
+unsigned long simple_strtoul(const char *cp,char **endp,unsigned int base)
+{
+	unsigned long result = 0,value;
+
+	if (!base) {
+		base = 10;
+		if (*cp == '0') {
+			base = 8;
+			cp++;
+			if ((*cp == 'x') && isxdigit(cp[1])) {
+				cp++;
+				base = 16;
+			}
+		}
+	}
+	while (isxdigit(*cp) &&
+	       (value = isdigit(*cp) ? *cp-'0' : toupper(*cp)-'A'+10) < base) {
+		result = result*base + value;
+		cp++;
+	}
+	if (endp)
+		*endp = (char *)cp;
+	return result;
+}
+
+/**
+ * simple_strtol - convert a string to a signed long
+ * @cp: The start of the string
+ * @endp: A pointer to the end of the parsed string will be placed here
+ * @base: The number base to use
+ */
+long simple_strtol(const char *cp,char **endp,unsigned int base)
+{
+	if(*cp=='-')
+		return -simple_strtoul(cp+1,endp,base);
+	return simple_strtoul(cp,endp,base);
+}
+
+/**
+ * simple_strtoull - convert a string to an unsigned long long
+ * @cp: The start of the string
+ * @endp: A pointer to the end of the parsed string will be placed here
+ * @base: The number base to use
+ */
+unsigned long long simple_strtoull(const char *cp,char **endp,unsigned int base)
+{
+	unsigned long long result = 0,value;
+
+	if (!base) {
+		base = 10;
+		if (*cp == '0') {
+			base = 8;
+			cp++;
+			if ((*cp == 'x') && isxdigit(cp[1])) {
+				cp++;
+				base = 16;
+			}
+		}
+	}
+	while (isxdigit(*cp) && (value = isdigit(*cp) ? *cp-'0' : (islower(*cp)
+	    ? toupper(*cp) : *cp)-'A'+10) < base) {
+		result = result*base + value;
+		cp++;
+	}
+	if (endp)
+		*endp = (char *)cp;
+	return result;
+}
+
+/**
+ * simple_strtoll - convert a string to a signed long long
+ * @cp: The start of the string
+ * @endp: A pointer to the end of the parsed string will be placed here
+ * @base: The number base to use
+ */
+long long simple_strtoll(const char *cp,char **endp,unsigned int base)
+{
+	if(*cp=='-')
+		return -simple_strtoull(cp+1,endp,base);
+	return simple_strtoull(cp,endp,base);
+}
+
+/**
+ * vsscanf - Unformat a buffer into a list of arguments
+ * @buf:	input buffer
+ * @fmt:	format of buffer
+ * @args:	arguments
+ */
+int vsscanf(const char * buf, const char * fmt, va_list args)
+{
+	const char *str = buf;
+	char *next;
+	int num = 0;
+	int qualifier;
+	int base;
+	int field_width = -1;
+	int is_sign = 0;
+
+	while(*fmt && *str) {
+		/* skip any white space in format */
+		/* white space in format matchs any amount of
+		 * white space, including none, in the input.
+		 */
+		if (isspace(*fmt)) {
+			while (isspace(*fmt))
+				++fmt;
+			while (isspace(*str))
+				++str;
+		}
+
+		/* anything that is not a conversion must match exactly */
+		if (*fmt != '%' && *fmt) {
+			if (*fmt++ != *str++)
+				break;
+			continue;
+		}
+
+		if (!*fmt)
+			break;
+		++fmt;
+		
+		/* skip this conversion.
+		 * advance both strings to next white space
+		 */
+		if (*fmt == '*') {
+			while (!isspace(*fmt) && *fmt)
+				fmt++;
+			while (!isspace(*str) && *str)
+				str++;
+			continue;
+		}
+
+		/* get field width */
+		if (isdigit(*fmt))
+			field_width = skip_atoi(&fmt);
+
+		/* get conversion qualifier */
+		qualifier = -1;
+		if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' || *fmt == 'Z') {
+			qualifier = *fmt;
+			fmt++;
+		}
+		base = 10;
+		is_sign = 0;
+
+		if (!*fmt || !*str)
+			break;
+
+		switch(*fmt++) {
+		case 'c':
+		{
+			char *s = (char *) va_arg(args,char*);
+			if (field_width == -1)
+				field_width = 1;
+			do {
+				*s++ = *str++;
+			} while(field_width-- > 0 && *str);
+			num++;
+		}
+		continue;
+		case 's':
+		{
+			char *s = (char *) va_arg(args, char *);
+			if(field_width == -1)
+				field_width = INT_MAX;
+			/* first, skip leading white space in buffer */
+			while (isspace(*str))
+				str++;
+
+			/* now copy until next white space */
+			while (*str && !isspace(*str) && field_width--) {
+				*s++ = *str++;
+			}
+			*s = '\0';
+			num++;
+		}
+		continue;
+		case 'n':
+			/* return number of characters read so far */
+		{
+			int *i = (int *)va_arg(args,int*);
+			*i = str - buf;
+		}
+		continue;
+		case 'o':
+			base = 8;
+			break;
+		case 'x':
+		case 'X':
+			base = 16;
+			break;
+		case 'd':
+		case 'i':
+			is_sign = 1;
+		case 'u':
+			break;
+		case '%':
+			/* looking for '%' in str */
+			if (*str++ != '%') 
+				return num;
+			continue;
+		default:
+			/* invalid format; stop here */
+			return num;
+		}
+
+		/* have some sort of integer conversion.
+		 * first, skip white space in buffer.
+		 */
+		while (isspace(*str))
+			str++;
+
+		if (!*str || !isdigit(*str))
+			break;
+
+		switch(qualifier) {
+		case 'h':
+			if (is_sign) {
+				short *s = (short *) va_arg(args,short *);
+				*s = (short) simple_strtol(str,&next,base);
+			} else {
+				unsigned short *s = (unsigned short *) va_arg(args, unsigned short *);
+				*s = (unsigned short) simple_strtoul(str, &next, base);
+			}
+			break;
+		case 'l':
+			if (is_sign) {
+				long *l = (long *) va_arg(args,long *);
+				*l = simple_strtol(str,&next,base);
+			} else {
+				unsigned long *l = (unsigned long*) va_arg(args,unsigned long*);
+				*l = simple_strtoul(str,&next,base);
+			}
+			break;
+		case 'L':
+			if (is_sign) {
+				long long *l = (long long*) va_arg(args,long long *);
+				*l = simple_strtoll(str,&next,base);
+			} else {
+				unsigned long long *l = (unsigned long long*) va_arg(args,unsigned long long*);
+				*l = simple_strtoull(str,&next,base);
+			}
+			break;
+		case 'Z':
+		{
+			unsigned long *s = (unsigned long*) va_arg(args,unsigned long*);
+			*s = (unsigned long) simple_strtoul(str,&next,base);
+		}
+		break;
+		default:
+			if (is_sign) {
+				int *i = (int *) va_arg(args, int*);
+				*i = (int) simple_strtol(str,&next,base);
+			} else {
+				unsigned int *i = (unsigned int*) va_arg(args, unsigned int*);
+				*i = (unsigned int) simple_strtoul(str,&next,base);
+			}
+			break;
+		}
+		num++;
+
+		if (!next)
+			break;
+		str = next;
+	}
+	return num;
+}
+
+/**
+ * sscanf - Unformat a buffer into a list of arguments
+ * @buf:	input buffer
+ * @fmt:	formatting of buffer
+ * @...:	resulting arguments
+ */
+int sscanf(const char * buf, const char * fmt, ...)
+{
+	va_list args;
+	int i;
+
+	va_start(args,fmt);
+	i = vsscanf(buf,fmt,args);
+	va_end(args);
+	
+	return i;
+}
+
+#endif
diff --git a/libc/minilibc/string.h b/libc/minilibc/string.h
new file mode 100644
index 0000000000000000000000000000000000000000..2435334170a7d5d379a5c5845d5d9ea1c80c09a5
--- /dev/null
+++ b/libc/minilibc/string.h
@@ -0,0 +1,70 @@
+/*
+ * File      : string.h
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2008, RT-Thread Development Team
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rt-thread.org/license/LICENSE
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2008-08-14     Bernard      the first version
+ */
+#ifndef __STRING_H__
+#define __STRING_H__
+
+#include <rtthread.h>
+#include <sys/types.h>
+
+/* replace for standard string library */
+#if !defined (RT_USING_NEWLIB) && defined (RT_USING_MINILIBC)
+
+#define ZEROPAD 	(1 << 0)	/* pad with zero */
+#define SIGN 		(1 << 1)	/* unsigned/signed long */
+#define PLUS 		(1 << 2)	/* show plus */
+#define SPACE 		(1 << 3)	/* space if plus */
+#define LEFT 		(1 << 4)	/* left justified */
+#define SPECIAL 	(1 << 5)	/* 0x */
+#define LARGE		(1 << 6)	/* use 'ABCDEF' instead of 'abcdef' */
+
+#define INT_MAX		((int)(~0U>>1))
+#define INT_MIN		(-INT_MAX - 1)
+#define UINT_MAX	(~0U)
+#define LONG_MAX	((long)(~0UL>>1))
+#define LONG_MIN	(-LONG_MAX - 1)
+#define ULONG_MAX	(~0UL)
+
+#define _U	0x01	/* upper */
+#define _L	0x02	/* lower */
+#define _D	0x04	/* digit */
+#define _C	0x08	/* cntrl */
+#define _P	0x10	/* punct */
+#define _S	0x20	/* white space (space/lf/tab) */
+#define _X	0x40	/* hex digit */
+#define _SP	0x80	/* hard space (0x20) */
+
+void* memset(void *s, int c, size_t n);
+void* memcpy(void *dest, const void *src, size_t n);
+void* memmove(void *dest, const void *src, size_t n);
+int memcmp(const void *s1, const void *s2, size_t n);
+
+int tolower(int c);
+int toupper(int c);
+
+int strcmp (const char *s1, const char *s2);
+int strcasecmp(const char *a, const char *b);
+int strncasecmp(const char *cs, const char *ct, size_t count);
+int sscanf(const char * buf, const char * fmt, ...);
+size_t strlen(const char *s);
+char * strstr(const char * s1,const char * s2);
+char *strcpy(char *dest, const char *src);
+char *strncpy(char *dest, const char *src, size_t n);
+char *strncat(char *s, const char *t, size_t n) ;
+char* strcat(register char* s,register const char* t);
+char *strrchr(const char *t, int c);
+char *strdup(const char *s);
+
+#endif
+
+#endif
diff --git a/libc/minilibc/sys/types.h b/libc/minilibc/sys/types.h
new file mode 100644
index 0000000000000000000000000000000000000000..035250c076dda399ea5c83f8af9732e494443cd3
--- /dev/null
+++ b/libc/minilibc/sys/types.h
@@ -0,0 +1,22 @@
+#ifndef __TYPES_H__
+#define __TYPES_H__
+
+#include <rtthread.h>
+
+typedef rt_off_t 	off_t;
+typedef rt_size_t 	size_t;
+
+typedef rt_uint8_t 	u_char;
+typedef rt_uint16_t u_short;
+typedef rt_ubase_t 	u_int;
+typedef rt_uint32_t u_long;
+
+typedef rt_uint8_t 	u_int8_t;
+typedef rt_uint16_t u_int16_t;
+typedef rt_uint32_t u_int32_t;
+
+#ifndef NULL
+#define NULL RT_NULL
+#endif
+
+#endif