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Annotation of 43BSDReno/lib/libc/tahoe/string/strncmp.s, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1988 Regents of the University of California.
                      3:  * All rights reserved.
                      4:  *
                      5:  * Redistribution and use in source and binary forms are permitted
                      6:  * provided that: (1) source distributions retain this entire copyright
                      7:  * notice and comment, and (2) distributions including binaries display
                      8:  * the following acknowledgement:  ``This product includes software
                      9:  * developed by the University of California, Berkeley and its contributors''
                     10:  * in the documentation or other materials provided with the distribution
                     11:  * and in all advertising materials mentioning features or use of this
                     12:  * software. Neither the name of the University nor the names of its
                     13:  * contributors may be used to endorse or promote products derived
                     14:  * from this software without specific prior written permission.
                     15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
                     16:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
                     17:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     18:  *
                     19:  * This code is derived from software contributed to Berkeley by
                     20:  * Computer Consoles Inc.
                     21:  */
                     22: 
                     23: #if defined(LIBC_SCCS) && !defined(lint)
                     24:        .asciz "@(#)strncmp.s   1.4 (Berkeley) 6/1/90"
                     25: #endif /* LIBC_SCCS and not lint */
                     26: 
                     27: /*
                     28:  * Compare strings (at most n bytes):  s1>s2: >0  s1==s2: 0  s1<s2: <0
                     29:  * 
                     30:  * strncmp(s1, s2, n)
                     31:  * register char *s1, *s2;
                     32:  * register n;
                     33:  */
                     34: #include "DEFS.h"
                     35: 
                     36: ENTRY(strncmp, 0)
                     37:        movl    12(fp),r2
                     38:        tstl    r2              /* number of bytes to compare */
                     39:        jgtr    n_ok
                     40:        clrl    r0
                     41:        ret                     /* for n <= 0 , s1 == s2 */
                     42: n_ok:
                     43:        movl    4(fp),r0
                     44:        movl    8(fp),r1
                     45:        cmps3
                     46:        jgtr    greater
                     47:        jlss    less
                     48: equal: clrl    r0
                     49:        ret
                     50: less:  movl    $-1,r0
                     51:        ret
                     52: greater: movl  $1,r0
                     53:        ret

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