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+/*
+ * Copyright (c) 1983 Regents of the University of California.
+ * All rights reserved.
+ *
+ * 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. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. 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.
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+ .asciz "@(#)strncat.s 5.6 (Berkeley) 6/1/90"
+#endif /* LIBC_SCCS and not lint */
+
+/*
+ * Concatenate string s2 on the end of s1
+ * and return the base of s1. The parameter
+ * n is the maximum length of string s2 to
+ * concatenate.
+ *
+ * char *
+ * strncat(s1, s2, n)
+ * char *s1, *s2;
+ * int n;
+ */
+#include "DEFS.h"
+
+ENTRY(strncat, R6)
+ movl 12(ap),r6 # r6 = n
+ bleq done # n <= 0
+ movl 4(ap),r3 # r3 = s1
+ movl r3,r1
+0:
+ locc $0,$65535,(r1)
+ beql 0b
+ movl r1,r3 # r3 = index(s1, '\0');
+ movl 8(ap),r1 # r1 = s2
+1:
+ movzwl $65535,r2 # r2 = bytes in first chunk
+ cmpl r6,r2 # r2 = min(bytes in chunk, n);
+ jgeq 2f
+ movl r6,r2
+2:
+ subl2 r2,r6 # update n
+ locc $0,r2,(r1) # '\0' found?
+ jneq 3f
+ subl2 r2,r1 # back up pointer updated by locc
+ movc3 r2,(r1),(r3) # copy in next piece
+ tstl r6 # run out of space?
+ jneq 1b
+ clrb (r3) # force '\0' termination
+ jbr done
+3:
+ subl2 r0,r2 # r2 = number of bytes to move
+ subl2 r2,r1 # back up pointer updated by locc
+ incl r2 # copy '\0' as well
+ movc3 r2,(r1),(r3) # copy in last piece
+done:
+ movl 4(ap),r0 # return s1
+ ret