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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 "@(#)strncmp.s 5.6 (Berkeley) 6/1/90"
+#endif /* LIBC_SCCS and not lint */
+
+/*
+ * Compare at most n characters of string
+ * s1 lexicographically to string s2.
+ * Return:
+ * 0 s1 == s2
+ * > 0 s1 > s2
+ * < 0 s2 < s2
+ *
+ * strncmp(s1, s2, n)
+ * char *s1, *s2;
+ * int n;
+ */
+#include "DEFS.h"
+
+ENTRY(strncmp, 0)
+ movl 4(ap),r1 # r1 = s1
+ movq 8(ap),r3 # r3 = s2; r4 = n
+1:
+ clrl r5 # calculate min bytes to next page boundry
+ subb3 r1,$255,r5 # r5 = (bytes - 1) to end of page for s1
+ subb3 r3,$255,r0 # r0 = (bytes - 1) to end of page for s2
+ cmpb r0,r5 # r5 = min(r0, r5);
+ bgtru 2f
+ movb r0,r5
+2:
+ incl r5 # r5 = min bytes to next page boundry
+ cmpl r4,r5 # r5 = min(n, r5);
+ bgeq 3f
+ movl r4,r5
+3:
+ cmpc3 r5,(r1),(r3) # compare strings
+ bneq 4f
+ subl2 r5,r4 # check for end of comparison
+ beql 5f
+ subl2 r5,r1 # check if found null yet
+ locc $0,r5,(r1)
+ beql 1b # not yet done, continue checking
+ subl2 r0,r3
+ mnegb (r3),r0 # r0 = '\0' - *s2
+ cvtbl r0,r0
+ ret
+4:
+ subl2 r0,r5 # check for null in matching string
+ subl2 r5,r1
+ locc $0,r5,(r1)
+ bneq 5f
+ subb3 (r3),(r1),r0 # r0 = *s1 - *s2
+ cvtbl r0,r0
+ ret
+5:
+ clrl r0 # both the same to null
+ ret