From efde8c6c9eea3e78b1da80761c390a2afa066c3b Mon Sep 17 00:00:00 2001
From: Ruben Dashyan <ruben.dashyan@numworks.com>
Date: Fri, 2 Nov 2018 18:09:28 +0100
Subject: [PATCH] [liba] Add strncmp

---
 liba/include/string.h |  1 +
 liba/src/strcmp.c     | 11 +++++++++++
 2 files changed, 12 insertions(+)

diff --git a/liba/include/string.h b/liba/include/string.h
index ff58e0c8a..64a237111 100644
--- a/liba/include/string.h
+++ b/liba/include/string.h
@@ -13,6 +13,7 @@ void * memset(void * b, int c, size_t len);
 
 char * strchr(const char * s, int c);
 int strcmp(const char * s1, const char * s2);
+int strncmp(const char * s1, const char * s2, size_t n);
 size_t strlcpy(char * dst, const char * src, size_t len);
 size_t strlen(const char * s);
 
diff --git a/liba/src/strcmp.c b/liba/src/strcmp.c
index cf72bf3f0..6df25bd06 100644
--- a/liba/src/strcmp.c
+++ b/liba/src/strcmp.c
@@ -7,3 +7,14 @@ int strcmp(const char *s1, const char *s2) {
   }
   return (*(unsigned char *)s1) - (*(unsigned char *)s2);
 }
+
+int strncmp(const char *s1, const char *s2, size_t n) {
+  while (n-- > 0) {
+    if (*s1 == NULL || *s2 != *s1) {
+      return (*(unsigned char *)s1) - (*(unsigned char *)s2);
+    }
+    s1++;
+    s2++;
+  }
+  return 0;
+}