lib: move strlcat()

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

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Julien Grall <jgrall@amazon.com>

xen/common/string.c

@@ -56,35 +56,6 @@ int (strcasecmp)(const char *s1, const char *s2)
 }
 #endif
 
-#ifndef __HAVE_ARCH_STRLCAT
-/**
- * strlcat - Append a %NUL terminated string into a sized buffer
- * @dest: Where to copy the string to
- * @src: Where to copy the string from
- * @size: size of destination buffer
- *
- * Compatible with *BSD: the result is always a valid
- * NUL-terminated string that fits in the buffer (unless,
- * of course, the buffer size is zero).
- */
-size_t strlcat(char *dest, const char *src, size_t size)
-{
-	size_t slen = strlen(src);
-	size_t dlen = strnlen(dest, size);
-	char *p = dest + dlen;
-
-	while ((p - dest) < size)
-		if ((*p++ = *src++) == '\0')
-			break;
-
-	if (dlen < size)
-		*(p-1) = '\0';
-
-	return slen + dlen;
-}
-EXPORT_SYMBOL(strlcat);
-#endif
-
 #ifndef __HAVE_ARCH_STRCHR
 /**
  * strchr - Find the first occurrence of a character in a string

xen/lib/Makefile

@@ -15,6 +15,7 @@ lib-y += parse-size.o
 lib-y += rbtree.o
 lib-y += sort.o
 lib-y += strcmp.o
+lib-y += strlcat.o
 lib-y += strlcpy.o
 lib-y += strlen.o
 lib-y += strncmp.o

xen/lib/strlcat.c

@@ -0,0 +1,41 @@
+/*
+ *  Copyright (C) 1991, 1992  Linus Torvalds
+ */
+
+#include <xen/string.h>
+
+/**
+ * strlcat - Append a %NUL terminated string into a sized buffer
+ * @dest: Where to copy the string to
+ * @src: Where to copy the string from
+ * @size: size of destination buffer
+ *
+ * Compatible with *BSD: the result is always a valid
+ * NUL-terminated string that fits in the buffer (unless,
+ * of course, the buffer size is zero).
+ */
+size_t strlcat(char *dest, const char *src, size_t size)
+{
+	size_t slen = strlen(src);
+	size_t dlen = strnlen(dest, size);
+	char *p = dest + dlen;
+
+	while ((p - dest) < size)
+		if ((*p++ = *src++) == '\0')
+			break;
+
+	if (dlen < size)
+		*(p-1) = '\0';
+
+	return slen + dlen;
+}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 8
+ * tab-width: 8
+ * indent-tabs-mode: t
+ * End:
+ */