[v2,08/20] lib: move strnlen()

Commit Message

Jan Beulich April 21, 2021, 2:22 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
@@ -184,22 +184,6 @@  char *(strrchr)(const char *s, int c)
 }
 #endif
 
-#ifndef __HAVE_ARCH_STRNLEN
-/**
- * strnlen - Find the length of a length-limited string
- * @s: The string to be sized
- * @count: The maximum number of bytes to search
- */
-size_t strnlen(const char * s, size_t count)
-{
-	const char *sc;
-
-	for (sc = s; count-- && *sc != '\0'; ++sc)
-		/* nothing */;
-	return sc - s;
-}
-#endif
-
 #ifndef __HAVE_ARCH_STRSPN
 /**
  * strspn - Calculate the length of the initial substring of @s which only
--- a/xen/lib/Makefile
+++ b/xen/lib/Makefile
@@ -15,6 +15,7 @@  lib-y += parse-size.o
 lib-y += rbtree.o
 lib-y += sort.o
 lib-y += strlen.o
+lib-y += strnlen.o
 lib-$(CONFIG_X86) += xxhash32.o
 lib-$(CONFIG_X86) += xxhash64.o
 
--- /dev/null
+++ b/xen/lib/strnlen.c
@@ -0,0 +1,29 @@ 
+/*
+ *  Copyright (C) 1991, 1992  Linus Torvalds
+ */
+
+#include <xen/string.h>
+
+/**
+ * strnlen - Find the length of a length-limited string
+ * @s: The string to be sized
+ * @count: The maximum number of bytes to search
+ */
+size_t strnlen(const char * s, size_t count)
+{
+	const char *sc;
+
+	for (sc = s; count-- && *sc != '\0'; ++sc)
+		/* nothing */;
+	return sc - s;
+}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 8
+ * tab-width: 8
+ * indent-tabs-mode: t
+ * End:
+ */