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, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22/* 23 * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 .ident "%Z%%M% %I% %E% SMI" 28 29 .file "%M%" 30 31#include <sys/asm_linkage.h> 32 33 ANSI_PRAGMA_WEAK(memccpy,function) 34 35#include "SYS.h" 36 37 ENTRY(memccpy) 38 pushl %esi / save register variable 39 movl 8(%esp),%eax / %eax = address of dest string 40 movl 12(%esp),%esi / %esi = address of source string 41 movb 16(%esp),%dh / %dh = character to search for 42 movl 20(%esp),%ecx / %ecx = length to go still 43.loop: 44 decl %ecx / decrement bytes to go 45 jl .notfound 46 movb (%esi),%dl 47 movb %dl,(%eax) / move byte 48 cmpb %dh,%dl / is it the byte sought? 49 je .found / yes 50 51 decl %ecx / decrement bytes to go 52 jl .notfound 53 movb 1(%esi),%dl 54 movb %dl,1(%eax) / move byte 55 cmpb %dh,%dl / is it the byte sought? 56 je .found1 / yes 57 58 decl %ecx / decrement bytes to go 59 jl .notfound 60 movb 2(%esi),%dl 61 movb %dl,2(%eax) / move byte 62 cmpb %dh,%dl / is it the byte sought? 63 je .found2 / yes 64 65 decl %ecx / decrement bytes to go 66 jl .notfound 67 movb 3(%esi),%dl 68 movb %dl,3(%eax) / move byte 69 addl $4,%esi 70 addl $4,%eax 71 cmpb %dh,%dl / is it the byte sought? 72 jne .loop / no 73 decl %eax 74 75.found: 76 popl %esi / restore register variable 77 incl %eax / return pointer to next byte in dest 78 ret 79 80 .align 4 81.found2: 82 incl %eax 83.found1: 84 popl %esi / restore register variable 85 addl $2,%eax / return pointer to next byte in dest 86 ret 87 88 .align 4 89.notfound: 90 popl %esi / restore register variable 91 xorl %eax,%eax / search fails 92 ret 93 SET_SIZE(memccpy) 94