From d014c0d6da7bfd922674d29cd5e7d027c887f85c Mon Sep 17 00:00:00 2001
From: "gary.li.wenchao.4" <gary.li.wenchao.4@gmail.com>
Date: Tue, 23 Feb 2010 04:44:04 +0000
Subject: [PATCH] add strncmp

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@437 bbd45198-f89e-11dd-88c7-29a3b14d5316
---
 libc/minilibc/string.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/libc/minilibc/string.c b/libc/minilibc/string.c
index 7edba9fc80..0b1d893f2a 100644
--- a/libc/minilibc/string.c
+++ b/libc/minilibc/string.c
@@ -41,6 +41,25 @@ int strcmp (const char *s1, const char *s2)
 	return (*s1 - *s2);
 }
 
+/**
+ * strncmp - Compare two length-limited strings
+ * @cs: One string
+ * @ct: Another string
+ * @count: The maximum number of bytes to compare
+ */
+int strncmp(const char * cs,const char * ct,rt_ubase_t count)
+{
+	register signed char __res = 0;
+
+	while (count) {
+		if ((__res = *cs - *ct++) != 0 || !*cs++)
+			break;
+		count--;
+	}
+
+	return __res;
+}
+
 char* strcat(register char* s,register const char* t)
 {
 	char *dest = s;