Move strlcat, strlcpy, and strnlen

Move strlcat() and strlcpy() from .c source files in to the libspl
string.h header.  By changing these compatibility functions to static
inline functions they can included as needed without requiring linking
with the libspl.so library.

Remove strnlen() which is barely used in the source, and has been
provided by glibc since v2.10.

Finally, convert four instances of strncpy() to strlcpy() in
libzfs_input_check.c which were causing build warnings when compiling
with gcc 8.2.1.  For example:

  libzfs_input_check.c: In function ‘zfs_destroy’:
  libzfs_input_check.c:651:9: error: ‘strncpy’ specified bound \
      4096 equals destination size [-Werror=stringop-truncation]
    (void) strncpy(zc.zc_name, dataset, sizeof (zc.zc_name));
         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Reviewed-by: Olaf Faaland <[email protected]>
Reviewed-by: Richard Laager <[email protected]>
Signed-off-by: Brian Behlendorf <[email protected]>
Closes #8116 

1 files changed, 0 insertions, 44 deletions

diff --git a/lib/libspl/strnlen.c b/lib/libspl/strnlen.c
deleted file mode 100644
index 9fb8227b9..000000000
--- a/lib/libspl/strnlen.c
+++ /dev/null
@@ -1,44 +0,0 @@
-/*
- * CDDL HEADER START
- *
- * The contents of this file are subject to the terms of the
- * Common Development and Distribution License (the "License").
- * You may not use this file except in compliance with the License.
- *
- * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
- * or http://www.opensolaris.org/os/licensing.
- * See the License for the specific language governing permissions
- * and limitations under the License.
- *
- * When distributing Covered Code, include this CDDL HEADER in each
- * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
- * If applicable, add the following below this CDDL HEADER, with the
- * fields enclosed by brackets "[]" replaced with your own identifying
- * information: Portions Copyright [yyyy] [name of copyright owner]
- *
- * CDDL HEADER END
- */
-
-/*
- * Copyright 2008 Sun Microsystems, Inc.
- * All rights reserved.  Use is subject to license terms.
- */
-
-#include <string.h>
-#include <sys/types.h>
-
-/*
- * Returns the number of non-NULL bytes in string argument,
- * but not more than maxlen.  Does not look past str + maxlen.
- */
-size_t
-strnlen(const char *str, size_t maxlen)
-{
-	const char *ptr;
-
-	ptr = memchr(str, 0, maxlen);
-	if (ptr == NULL)
-		return (maxlen);
-
-	return (ptr - str);
-}