[kvm-unit-tests PATCH v4 04/13] lib/string: add strncmp

["Radim Krčmář" <rkrcmar@redhat.com>]

Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
---
 v4: new

 lib/string.c | 17 ++++++++++-------
 lib/string.h |  1 +
 2 files changed, 11 insertions(+), 7 deletions(-)

diff --git a/lib/string.c b/lib/string.c
index e7bcfe945fcf..ee93e25e9821 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -26,15 +26,18 @@ char *strcpy(char *dest, const char *src)
     return strcat(dest, src);
 }
 
+int strncmp(const char *a, const char *b, size_t n)
+{
+    for (; n--; ++a, ++b)
+        if (*a != *b || *a == '\0')
+            return *a - *b;
+
+    return 0;
+}
+
 int strcmp(const char *a, const char *b)
 {
-    while (*a == *b) {
-	if (*a == '\0') {
-	    break;
-	}
-	++a, ++b;
-    }
-    return *a - *b;
+    return strncmp(a, b, SIZE_MAX);
 }
 
 char *strchr(const char *s, int c)
diff --git a/lib/string.h b/lib/string.h
index 4e24f54d9e23..2391013ad2b1 100644
--- a/lib/string.h
+++ b/lib/string.h
@@ -5,6 +5,7 @@ extern unsigned long strlen(const char *buf);
 extern char *strcat(char *dest, const char *src);
 extern char *strcpy(char *dest, const char *src);
 extern int strcmp(const char *a, const char *b);
+extern int strncmp(const char *a, const char *b, size_t n);
 extern char *strchr(const char *s, int c);
 extern char *strstr(const char *haystack, const char *needle);
 extern void *memset(void *s, int c, size_t n);
-- 
2.8.2