usr/src/lib/libc/i386/gen/wschr.s

   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   "wschr.s"
  28
  29 /
  30 / Wide character wcschr() implementation
  31 /
  32 / Algorithm based on Solaris 2.6 gen/strchr.s implementation
  33 /
  34
  35 #include "SYS.h"
  36
  37         ANSI_PRAGMA_WEAK(wcschr,function)
  38         ANSI_PRAGMA_WEAK(wschr,function)
  39
  40         .align  8               / accounts for .loop alignment and prolog
  41
  42         ENTRY(wcschr)
  43         movl    4(%esp),%eax    / %eax = string address
  44         movl    8(%esp),%ecx    / %ecx = wchar sought
  45 .loop:
  46         movl    (%eax),%edx     / %edx = wchar of string
  47         cmpl    %ecx,%edx       / find it?
  48         je      .found          / yes
  49         testl   %edx,%edx       / is it null?
  50         je      .notfound
  51
  52         movl    4(%eax),%edx    / %edx = wchar of string
  53         cmpl    %ecx,%edx       / find it?
  54         je      .found1         / yes
  55         testl   %edx,%edx       / is it null?
  56         je      .notfound
  57
  58         movl    8(%eax),%edx    / %edx = wchar of string
  59         cmpl    %ecx,%edx       / find it?
  60         je      .found2         / yes
  61         testl   %edx,%edx       / is it null?
  62         je      .notfound
  63
  64         movl    12(%eax),%edx   / %edx = wchar of string
  65         cmpl    %ecx,%edx       / find it?
  66         je      .found3         / yes
  67         addl    $16,%eax
  68         testl   %edx,%edx       / is it null?
  69         jne     .loop
  70
  71 .notfound:
  72         xorl    %eax,%eax       / %eax = NULL
  73         ret
  74
  75 .found3:
  76         addl    $12,%eax
  77         ret
  78 .found2:
  79         addl    $8,%eax
  80         ret
  81 .found1:
  82         addl    $4,%eax
  83 .found:
  84         ret
  85         SET_SIZE(wcschr)
  86
  87         ENTRY(wschr)
  88         _prologue_
  89         movl    _esp_(8),%eax
  90         movl    _esp_(4),%edx
  91         pushl   %eax
  92         pushl   %edx
  93         call    _fref_(wcschr)
  94         addl    $8,%esp
  95         _epilogue_
  96         ret
  97         SET_SIZE(wschr)