[xen staging] lib: move strncmp()

[patchbot@xxxxxxx]

commit 187e1e21d69faf43754ecfe79aa6b3119736a8ea
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Thu Apr 22 14:48:38 2021 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Thu Apr 22 14:48:38 2021 +0200

    lib: move strncmp()
    
    Allow the function to be individually linkable, discardable, and
    overridable.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Acked-by: Julien Grall <jgrall@xxxxxxxxxx>
---
 xen/common/string.c | 21 ---------------------
 xen/lib/Makefile    |  1 +
 xen/lib/strncmp.c   | 34 ++++++++++++++++++++++++++++++++++
 3 files changed, 35 insertions(+), 21 deletions(-)

diff --git a/xen/common/string.c b/xen/common/string.c
index 1d8cd0ab05..f36a4a31e5 100644
--- a/xen/common/string.c
+++ b/xen/common/string.c
@@ -111,27 +111,6 @@ size_t strlcat(char *dest, const char *src, size_t size)
 EXPORT_SYMBOL(strlcat);
 #endif
 
-#ifndef __HAVE_ARCH_STRNCMP
-/**
- * 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, size_t count)
-{
-       register signed char __res = 0;
-
-       while (count) {
-               if ((__res = *cs - *ct++) != 0 || !*cs++)
-                       break;
-               count--;
-       }
-
-       return __res;
-}
-#endif
-
 #ifndef __HAVE_ARCH_STRCHR
 /**
  * strchr - Find the first occurrence of a character in a string
diff --git a/xen/lib/Makefile b/xen/lib/Makefile
index c85fed7d01..12af30d670 100644
--- a/xen/lib/Makefile
+++ b/xen/lib/Makefile
@@ -16,6 +16,7 @@ lib-y += rbtree.o
 lib-y += sort.o
 lib-y += strcmp.o
 lib-y += strlen.o
+lib-y += strncmp.o
 lib-y += strnlen.o
 lib-$(CONFIG_X86) += xxhash32.o
 lib-$(CONFIG_X86) += xxhash64.o
diff --git a/xen/lib/strncmp.c b/xen/lib/strncmp.c
new file mode 100644
index 0000000000..9af7fa1c99
--- /dev/null
+++ b/xen/lib/strncmp.c
@@ -0,0 +1,34 @@
+/*
+ *  Copyright (C) 1991, 1992  Linus Torvalds
+ */
+
+#include <xen/string.h>
+
+/**
+ * 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, size_t count)
+{
+       register signed char __res = 0;
+
+       while (count) {
+               if ((__res = *cs - *ct++) != 0 || !*cs++)
+                       break;
+               count--;
+       }
+
+       return __res;
+}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 8
+ * tab-width: 8
+ * indent-tabs-mode: t
+ * End:
+ */
--
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