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- /*-
- * Copyright (c) 1990 The Regents of the University of California.
- * All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * the Systems Programming Group of the University of Utah Computer
- * Science Department.
- *
- * Redistribution and use in source and binary forms are permitted
- * provided that: (1) source distributions retain this entire copyright
- * notice and comment, and (2) distributions including binaries display
- * the following acknowledgement: ``This product includes software
- * developed by the University of California, Berkeley and its contributors''
- * in the documentation or other materials provided with the distribution
- * and in all advertising materials mentioning features or use of this
- * software. 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 ``AS IS'' AND WITHOUT ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
- * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
- */
-
- #if defined(LIBC_SCCS) && !defined(lint)
- .asciz "@(#)strncmp.s 5.1 (Berkeley) 5/12/90"
- #endif /* LIBC_SCCS and not lint */
-
- #include "DEFS.h"
-
- /*
- * NOTE: this guy returns result compatible with the VAX assembly version.
- * The C version on the portable gen directory returns different results
- * (different signs!) when comparing chars with the high bit on. Who is
- * right??
- */
- ENTRY(strncmp)
- movl sp@(12),d1 /* count */
- jeq scdone /* nothing to do */
- movl sp@(4),a0 /* a0 = string1 */
- movl sp@(8),a1 /* a1 = string2 */
- scloop:
- movb a0@+,d0 /* get *string1 */
- cmpb a1@+,d0 /* compare a byte */
- jne scexit /* not equal, break out */
- tstb d0 /* at end of string1? */
- jeq scdone /* yes, all done */
- subql #1,d1 /* no, adjust count */
- jne scloop /* more to do, keep going */
- scdone:
- moveq #0,d0 /* strings are equal */
- rts
- scexit:
- subb a1@-,d0 /* *string1 - *string2 */
- extw d0
- extl d0
- rts
-