1/*- 2 * Copyright (c) 1990, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * the Systems Programming Group of the University of Utah Computer 7 * Science Department. 8 * 9 * %sccs.include.redist.c% 10 */ 11 12#if defined(LIBC_SCCS) && !defined(lint) 13 .asciz "@(#)strncmp.s 8.1 (Berkeley) 06/04/93" 14#endif /* LIBC_SCCS and not lint */ 15 16#include "DEFS.h" 17 18/* 19 * NOTE: this guy returns result compatible with the VAX assembly version. 20 * The C version on the portable gen directory returns different results 21 * (different signs!) when comparing chars with the high bit on. Who is 22 * right?? 23 */ 24ENTRY(strncmp) 25 movl sp@(12),d1 /* count */ 26 jeq scdone /* nothing to do */ 27 movl sp@(4),a0 /* a0 = string1 */ 28 movl sp@(8),a1 /* a1 = string2 */ 29scloop: 30 movb a0@+,d0 /* get *string1 */ 31 cmpb a1@+,d0 /* compare a byte */ 32 jne scexit /* not equal, break out */ 33 tstb d0 /* at end of string1? */ 34 jeq scdone /* yes, all done */ 35 subql #1,d1 /* no, adjust count */ 36 jne scloop /* more to do, keep going */ 37scdone: 38 moveq #0,d0 /* strings are equal */ 39 rts 40scexit: 41 subb a1@-,d0 /* *string1 - *string2 */ 42 extbl d0 43 rts 44