diff --git a/src/common_define.h b/src/common_define.h
index 186c44f..927a731 100644
--- a/src/common_define.h
+++ b/src/common_define.h
@@ -226,6 +226,15 @@ typedef void* (*MallocFunc)(size_t size);
         (dest).len = strlen(src); \
     } while (0)
 
+#define FC_SET_STRING_NULL(dest)  \
+    do {  \
+        (dest).str = NULL;   \
+        (dest).len = 0;      \
+    } while (0)
+
+#define FC_IS_NULL_STRING(s)  ((s)->str == NULL)
+#define FC_IS_EMPTY_STRING(s)  ((s)->len == 0)
+
 #define fc_compare_string(s1, s2) fc_string_compare(s1, s2)
 
 static inline int fc_string_compare(const string_t *s1, const string_t *s2)
@@ -247,6 +256,15 @@ static inline bool fc_string_equal(const string_t *s1, const string_t *s2)
     return (s1->len == s2->len) && (memcmp(s1->str, s2->str, s1->len) == 0);
 }
 
+static inline bool fc_string_equal2(const string_t *s1,
+        const char *str2, const int len2)
+{
+    return (s1->len == len2) && (memcmp(s1->str, str2, s1->len) == 0);
+}
+
+#define fc_string_equals(s1, s2) fc_string_equal(s1, s2)
+#define fc_string_equals2(s1, str2, len2) fc_string_equal2(s1, str2, len2)
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/fast_allocator.h b/src/fast_allocator.h
index 9a23c2a..8f524ab 100644
--- a/src/fast_allocator.h
+++ b/src/fast_allocator.h
@@ -76,7 +76,7 @@ return error no, 0 for success, != 0 fail
 */
 int fast_allocator_init(struct fast_allocator_context *acontext,
         const int64_t alloc_bytes_limit, const double expect_usage_ratio,
-	const int reclaim_interval, const bool need_lock);
+        const int reclaim_interval, const bool need_lock);
 
 /**
 allocator init
@@ -93,7 +93,7 @@ return error no, 0 for success, != 0 fail
 int fast_allocator_init_ex(struct fast_allocator_context *acontext,
         struct fast_region_info *regions, const int region_count,
         const int64_t alloc_bytes_limit, const double expect_usage_ratio,
-	const int reclaim_interval, const bool need_lock);
+        const int reclaim_interval, const bool need_lock);
 
 /**
 allocator destroy
diff --git a/src/fast_mpool.c b/src/fast_mpool.c
index b101a0d..df78432 100644
--- a/src/fast_mpool.c
+++ b/src/fast_mpool.c
@@ -165,6 +165,25 @@ void *fast_mpool_alloc(struct fast_mpool_man *mpool, const int size)
 	return NULL;
 }
 
+
+int fast_mpool_strdup(struct fast_mpool_man *mpool, string_t *dest,
+        const string_t *src)
+{
+    dest->str = (char *)fast_mpool_alloc(mpool, src->len);
+    if (dest->str == NULL)
+    {
+        logError("file: "__FILE__", line: %d, "
+                "alloc %d bytes from mpool fail", __LINE__, src->len);
+        return ENOMEM;
+    }
+
+    if (src->len > 0) {
+        memcpy(dest->str, src->str, src->len);
+    }
+    dest->len = src->len;
+    return 0;
+}
+
 void fast_mpool_reset(struct fast_mpool_man *mpool)
 {
 	struct fast_mpool_malloc *pMallocNode;
diff --git a/src/fast_mpool.h b/src/fast_mpool.h
index 5cbb1ca..b58b899 100644
--- a/src/fast_mpool.h
+++ b/src/fast_mpool.h
@@ -82,6 +82,18 @@ return the alloced ptr, return NULL if fail
 */
 void *fast_mpool_alloc(struct fast_mpool_man *mpool, const int size);
 
+
+/**
+alloc and copy string from the mpool
+parameters:
+	mpool: the mpool pointer
+	dest: the dest string (return the alloced memory in dest->str)
+	src: the source string
+return error no, 0 for success, != 0 fail
+*/
+int fast_mpool_strdup(struct fast_mpool_man *mpool, string_t *dest,
+        const string_t *src);
+
 /**
 get stats
 parameters:
diff --git a/src/shared_func.c b/src/shared_func.c
index 763415e..10e7eb5 100644
--- a/src/shared_func.c
+++ b/src/shared_func.c
@@ -616,6 +616,52 @@ char *trim(char *pStr)
 	return pStr;
 }
 
+void string_ltrim(string_t *s)
+{
+	char *p;
+	char *end;
+
+	end = s->str + s->len;
+	for (p=s->str; p<end; p++)
+	{
+		if (!(' ' == *p|| '\n' == *p || '\r' == *p || '\t' == *p))
+		{
+			break;
+		}
+	}
+
+	if (p != s->str)
+    {
+        s->str = p;
+        s->len = end - p;
+    }
+}
+
+void string_rtrim(string_t *s)
+{
+	char *p;
+	char *end;
+
+	if (s->len == 0)
+	{
+		return;
+	}
+
+	end = s->str + s->len - 1;
+	for (p = end; p >= s->str; p--)
+	{
+		if (!(' ' == *p || '\n' == *p || '\r' == *p || '\t' == *p))
+		{
+			break;
+		}
+	}
+
+	if (p != end)
+	{
+        s->len = (p + 1) - s->str;
+	}
+}
+
 char *formatDateYYYYMMDDHHMISS(const time_t t, char *szDateBuff, const int nSize)
 {
 	time_t timer = t;
diff --git a/src/shared_func.h b/src/shared_func.h
index 220c8d1..f73e4a2 100644
--- a/src/shared_func.h
+++ b/src/shared_func.h
@@ -282,6 +282,31 @@ static inline char *fc_trim(char *pStr)
 	return pStr;
 }
 
+/** trim leading spaces ( \t\r\n)
+ *  parameters:
+ *  	s: the string to trim
+ *  return: none
+*/
+void string_ltrim(string_t *s);
+
+/** trim tail spaces ( \t\r\n)
+ *  parameters:
+ *  	s: the string to trim
+ *  return: none
+*/
+void string_rtrim(string_t *s);
+
+#define FC_STRING_TRIM(s)  \
+    do {  \
+        string_ltrim(s);  \
+        string_rtrim(s);  \
+    } while (0)
+
+static inline void string_trim(string_t *s)
+{
+    FC_STRING_TRIM(s);
+}
+
 /** copy string to BufferInfo
  *  parameters:
  *  	pBuff: the dest buffer