1/* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22/* 23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 .file "wsncmp.s" 28 29/ 30/ Wide character wcsncpy() implementation 31/ 32/ Algorithm based on Solaris 2.6 gen/strncpy.s implementation 33/ 34 35#include "SYS.h" 36 37 ANSI_PRAGMA_WEAK(wcsncmp,function) 38 ANSI_PRAGMA_WEAK(wsncmp,function) 39 40 ENTRY(wcsncmp) 41 pushl %esi / save register variables 42 movl 8(%esp),%esi / %esi = first string 43 movl %edi,%edx 44 movl 12(%esp),%edi / %edi = second string 45 cmpl %esi,%edi / same string? 46 je .equal 47 movl 16(%esp),%ecx / %ecx = length 48 incl %ecx / will later predecrement this uint 49.loop: 50 decl %ecx 51 je .equal / Used all n chars? 52 movl (%esi),%eax / slodb ; scab 53 cmpl (%edi),%eax 54 jne .notequal_0 / Are the bytes equal? 55 testl %eax,%eax 56 je .equal / End of string? 57 58 decl %ecx 59 je .equal / Used all n chars? 60 movl 4(%esi),%eax / slodb ; scab 61 cmpl 4(%edi),%eax 62 jne .notequal_1 / Are the bytes equal? 63 testl %eax,%eax 64 je .equal / End of string? 65 66 decl %ecx 67 je .equal / Used all n chars? 68 movl 8(%esi),%eax / slodb ; scab 69 cmpl 8(%edi),%eax 70 jne .notequal_2 / Are the bytes equal? 71 testl %eax,%eax 72 je .equal / End of string? 73 74 decl %ecx 75 je .equal / Used all n chars? 76 movl 12(%esi),%eax / slodb ; scab 77 cmpl 12(%edi),%eax 78 jne .notequal_3 / Are the bytes equal? 79 addl $16,%esi 80 addl $16,%edi 81 testl %eax,%eax 82 jne .loop / End of string? 83 84.equal: 85 popl %esi / restore registers 86 xorl %eax,%eax / return 0 87 movl %edx,%edi 88 ret 89 90 .align 4 91.notequal_3: 92 addl $4,%edi 93.notequal_2: 94 addl $4,%edi 95.notequal_1: 96 addl $4,%edi 97.notequal_0: 98 popl %esi / restore registers 99 subl (%edi),%eax / return value is (*s1 - *--s2) 100 movl %edx,%edi 101 ret 102 SET_SIZE(wcsncmp) 103 104 ENTRY(wsncmp) 105 _prologue_ 106 movl _esp_(12),%ecx 107 movl _esp_(8),%eax 108 movl _esp_(4),%edx 109 pushl %ecx 110 pushl %eax 111 pushl %edx 112 call _fref_(wcsncmp) 113 addl $12,%esp 114 _epilogue_ 115 ret 116 SET_SIZE(wsncmp) 117