aboutsummaryrefslogtreecommitdiff
path: root/lib/stdlib/strncpy.c
diff options
context:
space:
mode:
Diffstat (limited to 'lib/stdlib/strncpy.c')
-rw-r--r--lib/stdlib/strncpy.c61
1 files changed, 61 insertions, 0 deletions
diff --git a/lib/stdlib/strncpy.c b/lib/stdlib/strncpy.c
new file mode 100644
index 000000000..00e4b7a41
--- /dev/null
+++ b/lib/stdlib/strncpy.c
@@ -0,0 +1,61 @@
+/*-
+ * Copyright (c) 1990, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Chris Torek.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * Portions copyright (c) 2015-2018, ARM Limited and Contributors.
+ * All rights reserved.
+ */
+
+#include <string.h>
+
+/*
+ * Copy src to dst, truncating or null-padding to always copy n bytes.
+ * Return dst.
+ */
+char *
+strncpy(char * __restrict dst, const char * __restrict src, size_t n)
+{
+ if (n != 0) {
+ char *d = dst;
+ const char *s = src;
+
+ do {
+ if ((*d++ = *s++) == '\0') {
+ /* NUL pad the remaining n-1 bytes */
+ while (--n != 0)
+ *d++ = '\0';
+ break;
+ }
+ } while (--n != 0);
+ }
+ return (dst);
+}