[v2,04/20] lib: move memcmp()

Commit Message

Jan Beulich April 21, 2021, 2:19 p.m. UTC

Allow the function to be individually linkable, discardable, and
overridable.

Signed-off-by: Jan Beulich <[e-mail]>

Patch

--- a/xen/common/string.c
+++ b/xen/common/string.c
@@ -311,25 +311,6 @@  char *(strstr)(const char *s1, const cha
 }
 #endif
 
-#ifndef __HAVE_ARCH_MEMCMP
-/**
- * memcmp - Compare two areas of memory
- * @cs: One area of memory
- * @ct: Another area of memory
- * @count: The size of the area.
- */
-int (memcmp)(const void *cs, const void *ct, size_t count)
-{
-	const unsigned char *su1, *su2;
-	int res = 0;
-
-	for( su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--)
-		if ((res = *su1 - *su2) != 0)
-			break;
-	return res;
-}
-#endif
-
 #ifndef __HAVE_ARCH_MEMCHR
 /**
  * memchr - Find a character in an area of memory.
--- a/xen/lib/Makefile
+++ b/xen/lib/Makefile
@@ -4,6 +4,7 @@  lib-y += bsearch.o
 lib-y += ctors.o
 lib-y += ctype.o
 lib-y += list-sort.o
+lib-y += memcmp.o
 lib-y += memcpy.o
 lib-y += memmove.o
 lib-y += memset.o
--- /dev/null
+++ b/xen/lib/memcmp.c
@@ -0,0 +1,32 @@ 
+/*
+ *  Copyright (C) 1991, 1992  Linus Torvalds
+ */
+
+#include <xen/string.h>
+
+/**
+ * memcmp - Compare two areas of memory
+ * @cs: One area of memory
+ * @ct: Another area of memory
+ * @count: The size of the area.
+ */
+int (memcmp)(const void *cs, const void *ct, size_t count)
+{
+	const unsigned char *su1, *su2;
+	int res = 0;
+
+	for( su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--)
+		if ((res = *su1 - *su2) != 0)
+			break;
+	return res;
+}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 8
+ * tab-width: 8
+ * indent-tabs-mode: t
+ * End:
+ */