The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/fs/msdosfs/msdosfs_conv.c

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    1 /* $FreeBSD$ */
    2 /*      $NetBSD: msdosfs_conv.c,v 1.25 1997/11/17 15:36:40 ws Exp $     */
    3 
    4 /*-
    5  * SPDX-License-Identifier: BSD-4-Clause
    6  *
    7  * Copyright (C) 1995, 1997 Wolfgang Solfrank.
    8  * Copyright (C) 1995, 1997 TooLs GmbH.
    9  * All rights reserved.
   10  * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below).
   11  *
   12  * Redistribution and use in source and binary forms, with or without
   13  * modification, are permitted provided that the following conditions
   14  * are met:
   15  * 1. Redistributions of source code must retain the above copyright
   16  *    notice, this list of conditions and the following disclaimer.
   17  * 2. Redistributions in binary form must reproduce the above copyright
   18  *    notice, this list of conditions and the following disclaimer in the
   19  *    documentation and/or other materials provided with the distribution.
   20  * 3. All advertising materials mentioning features or use of this software
   21  *    must display the following acknowledgement:
   22  *      This product includes software developed by TooLs GmbH.
   23  * 4. The name of TooLs GmbH may not be used to endorse or promote products
   24  *    derived from this software without specific prior written permission.
   25  *
   26  * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
   27  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   28  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   29  * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   30  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   31  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
   32  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
   33  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
   34  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
   35  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   36  */
   37 /*-
   38  * Written by Paul Popelka (paulp@uts.amdahl.com)
   39  *
   40  * You can do anything you want with this software, just don't say you wrote
   41  * it, and don't remove this notice.
   42  *
   43  * This software is provided "as is".
   44  *
   45  * The author supplies this software to be publicly redistributed on the
   46  * understanding that the author is not responsible for the correct
   47  * functioning of this software in any circumstances and is not liable for
   48  * any damages caused by this software.
   49  *
   50  * October 1992
   51  */
   52 
   53 #include <sys/param.h>
   54 #include <sys/systm.h>
   55 #include <sys/dirent.h>
   56 #include <sys/iconv.h>
   57 #include <sys/mount.h>
   58 
   59 #include <fs/msdosfs/bpb.h>
   60 #include <fs/msdosfs/direntry.h>
   61 #include <fs/msdosfs/msdosfsmount.h>
   62 
   63 extern struct iconv_functions *msdosfs_iconv;
   64 
   65 static int mbsadjpos(const char **, size_t, size_t, int, int, void *handle);
   66 static u_char * dos2unixchr(u_char *, const u_char **, size_t *, int, struct msdosfsmount *);
   67 static uint16_t unix2doschr(const u_char **, size_t *, struct msdosfsmount *);
   68 static u_char * win2unixchr(u_char *, uint16_t, struct msdosfsmount *);
   69 static uint16_t unix2winchr(const u_char **, size_t *, int, struct msdosfsmount *);
   70 
   71 /*
   72  * 0 - character disallowed in long file name.
   73  * 1 - character should be replaced by '_' in DOS file name,
   74  *     and generation number inserted.
   75  * 2 - character ('.' and ' ') should be skipped in DOS file name,
   76  *     and generation number inserted.
   77  */
   78 static const u_char
   79 unix2dos[256] = {
   80 /* iso8859-1 -> cp850 */
   81         0,    0,    0,    0,    0,    0,    0,    0,    /* 00-07 */
   82         0,    0,    0,    0,    0,    0,    0,    0,    /* 08-0f */
   83         0,    0,    0,    0,    0,    0,    0,    0,    /* 10-17 */
   84         0,    0,    0,    0,    0,    0,    0,    0,    /* 18-1f */
   85         2,    0x21, 0,    0x23, 0x24, 0x25, 0x26, 0x27, /* 20-27 */
   86         0x28, 0x29, 0,    1,    1,    0x2d, 2,    0,    /* 28-2f */
   87         0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 30-37 */
   88         0x38, 0x39, 0,    1,    0,    1,    0,    0,    /* 38-3f */
   89         0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 40-47 */
   90         0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 48-4f */
   91         0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 50-57 */
   92         0x58, 0x59, 0x5a, 1,    0,    1,    0x5e, 0x5f, /* 58-5f */
   93         0x60, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 60-67 */
   94         0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 68-6f */
   95         0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 70-77 */
   96         0x58, 0x59, 0x5a, 0x7b, 0,    0x7d, 0x7e, 0,    /* 78-7f */
   97         0,    0,    0,    0,    0,    0,    0,    0,    /* 80-87 */
   98         0,    0,    0,    0,    0,    0,    0,    0,    /* 88-8f */
   99         0,    0,    0,    0,    0,    0,    0,    0,    /* 90-97 */
  100         0,    0,    0,    0,    0,    0,    0,    0,    /* 98-9f */
  101         0,    0xad, 0xbd, 0x9c, 0xcf, 0xbe, 0xdd, 0xf5, /* a0-a7 */
  102         0xf9, 0xb8, 0xa6, 0xae, 0xaa, 0xf0, 0xa9, 0xee, /* a8-af */
  103         0xf8, 0xf1, 0xfd, 0xfc, 0xef, 0xe6, 0xf4, 0xfa, /* b0-b7 */
  104         0xf7, 0xfb, 0xa7, 0xaf, 0xac, 0xab, 0xf3, 0xa8, /* b8-bf */
  105         0xb7, 0xb5, 0xb6, 0xc7, 0x8e, 0x8f, 0x92, 0x80, /* c0-c7 */
  106         0xd4, 0x90, 0xd2, 0xd3, 0xde, 0xd6, 0xd7, 0xd8, /* c8-cf */
  107         0xd1, 0xa5, 0xe3, 0xe0, 0xe2, 0xe5, 0x99, 0x9e, /* d0-d7 */
  108         0x9d, 0xeb, 0xe9, 0xea, 0x9a, 0xed, 0xe8, 0xe1, /* d8-df */
  109         0xb7, 0xb5, 0xb6, 0xc7, 0x8e, 0x8f, 0x92, 0x80, /* e0-e7 */
  110         0xd4, 0x90, 0xd2, 0xd3, 0xde, 0xd6, 0xd7, 0xd8, /* e8-ef */
  111         0xd1, 0xa5, 0xe3, 0xe0, 0xe2, 0xe5, 0x99, 0xf6, /* f0-f7 */
  112         0x9d, 0xeb, 0xe9, 0xea, 0x9a, 0xed, 0xe8, 0x98, /* f8-ff */
  113 };
  114 
  115 static const u_char
  116 dos2unix[256] = {
  117 /* cp850 -> iso8859-1 */
  118         0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, /* 00-07 */
  119         0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, /* 08-0f */
  120         0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, /* 10-17 */
  121         0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, /* 18-1f */
  122         0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 20-27 */
  123         0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 28-2f */
  124         0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 30-37 */
  125         0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 38-3f */
  126         0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 40-47 */
  127         0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 48-4f */
  128         0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 50-57 */
  129         0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 58-5f */
  130         0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 60-67 */
  131         0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 68-6f */
  132         0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 70-77 */
  133         0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 78-7f */
  134         0xc7, 0xfc, 0xe9, 0xe2, 0xe4, 0xe0, 0xe5, 0xe7, /* 80-87 */
  135         0xea, 0xeb, 0xe8, 0xef, 0xee, 0xec, 0xc4, 0xc5, /* 88-8f */
  136         0xc9, 0xe6, 0xc6, 0xf4, 0xf6, 0xf2, 0xfb, 0xf9, /* 90-97 */
  137         0xff, 0xd6, 0xdc, 0xf8, 0xa3, 0xd8, 0xd7, 0x3f, /* 98-9f */
  138         0xe1, 0xed, 0xf3, 0xfa, 0xf1, 0xd1, 0xaa, 0xba, /* a0-a7 */
  139         0xbf, 0xae, 0xac, 0xbd, 0xbc, 0xa1, 0xab, 0xbb, /* a8-af */
  140         0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0xc1, 0xc2, 0xc0, /* b0-b7 */
  141         0xa9, 0x3f, 0x3f, 0x3f, 0x3f, 0xa2, 0xa5, 0x3f, /* b8-bf */
  142         0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0xe3, 0xc3, /* c0-c7 */
  143         0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0xa4, /* c8-cf */
  144         0xf0, 0xd0, 0xca, 0xcb, 0xc8, 0x3f, 0xcd, 0xce, /* d0-d7 */
  145         0xcf, 0x3f, 0x3f, 0x3f, 0x3f, 0xa6, 0xcc, 0x3f, /* d8-df */
  146         0xd3, 0xdf, 0xd4, 0xd2, 0xf5, 0xd5, 0xb5, 0xfe, /* e0-e7 */
  147         0xde, 0xda, 0xdb, 0xd9, 0xfd, 0xdd, 0xaf, 0x3f, /* e8-ef */
  148         0xad, 0xb1, 0x3f, 0xbe, 0xb6, 0xa7, 0xf7, 0xb8, /* f0-f7 */
  149         0xb0, 0xa8, 0xb7, 0xb9, 0xb3, 0xb2, 0x3f, 0x3f, /* f8-ff */
  150 };
  151 
  152 static const u_char
  153 u2l[256] = {
  154 /* tolower */
  155         0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 00-07 */
  156         0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 08-0f */
  157         0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 10-17 */
  158         0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /* 18-1f */
  159         0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 20-27 */
  160         0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 28-2f */
  161         0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 30-37 */
  162         0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 38-3f */
  163         0x40, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 40-47 */
  164         0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 48-4f */
  165         0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 50-57 */
  166         0x78, 0x79, 0x7a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 58-5f */
  167         0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 60-67 */
  168         0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 68-6f */
  169         0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 70-77 */
  170         0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 78-7f */
  171         0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, /* 80-87 */
  172         0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, /* 88-8f */
  173         0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, /* 90-97 */
  174         0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, /* 98-9f */
  175         0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, /* a0-a7 */
  176         0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, /* a8-af */
  177         0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, /* b0-b7 */
  178         0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, /* b8-bf */
  179         0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* c0-c7 */
  180         0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* c8-cf */
  181         0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xd7, /* d0-d7 */
  182         0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xdf, /* d8-df */
  183         0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* e0-e7 */
  184         0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* e8-ef */
  185         0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, /* f0-f7 */
  186         0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, /* f8-ff */
  187 };
  188 
  189 static const u_char
  190 l2u[256] = {
  191 /* toupper */
  192         0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 00-07 */
  193         0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 08-0f */
  194         0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 10-17 */
  195         0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /* 18-1f */
  196         0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 20-27 */
  197         0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 28-2f */
  198         0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 30-37 */
  199         0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 38-3f */
  200         0x40, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 40-47 */
  201         0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 48-4f */
  202         0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 50-57 */
  203         0x78, 0x79, 0x7a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 58-5f */
  204         0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 60-67 */
  205         0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 68-6f */
  206         0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 70-77 */
  207         0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 78-7f */
  208         0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, /* 80-87 */
  209         0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, /* 88-8f */
  210         0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, /* 90-97 */
  211         0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, /* 98-9f */
  212         0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, /* a0-a7 */
  213         0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, /* a8-af */
  214         0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, /* b0-b7 */
  215         0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, /* b8-bf */
  216         0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* c0-c7 */
  217         0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* c8-cf */
  218         0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xd7, /* d0-d7 */
  219         0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xdf, /* d8-df */
  220         0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* e0-e7 */
  221         0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* e8-ef */
  222         0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, /* f0-f7 */
  223         0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, /* f8-ff */
  224 };
  225 
  226 /*
  227  * DOS filenames are made of 2 parts, the name part and the extension part.
  228  * The name part is 8 characters long and the extension part is 3
  229  * characters long.  They may contain trailing blanks if the name or
  230  * extension are not long enough to fill their respective fields.
  231  */
  232 
  233 /*
  234  * Convert a DOS filename to a unix filename. And, return the number of
  235  * characters in the resulting unix filename excluding the terminating
  236  * null.
  237  */
  238 int
  239 dos2unixfn(u_char dn[11], u_char *un, int lower, struct msdosfsmount *pmp)
  240 {
  241         size_t i;
  242         int thislong = 0;
  243         u_char *c, tmpbuf[5];
  244 
  245         /*
  246          * If first char of the filename is SLOT_E5 (0x05), then the real
  247          * first char of the filename should be 0xe5. But, they couldn't
  248          * just have a 0xe5 mean 0xe5 because that is used to mean a freed
  249          * directory slot. Another dos quirk.
  250          */
  251         if (*dn == SLOT_E5)
  252                 *dn = 0xe5;
  253 
  254         /*
  255          * Copy the name portion into the unix filename string.
  256          */
  257         for (i = 8; i > 0 && *dn != ' ';) {
  258                 c = dos2unixchr(tmpbuf, __DECONST(const u_char **, &dn), &i,
  259                     lower & LCASE_BASE, pmp);
  260                 while (*c != '\0') {
  261                         *un++ = *c++;
  262                         thislong++;
  263                 }
  264         }
  265         dn += i;
  266 
  267         /*
  268          * Now, if there is an extension then put in a period and copy in
  269          * the extension.
  270          */
  271         if (*dn != ' ') {
  272                 *un++ = '.';
  273                 thislong++;
  274                 for (i = 3; i > 0 && *dn != ' ';) {
  275                         c = dos2unixchr(tmpbuf, __DECONST(const u_char **, &dn),
  276                             &i, lower & LCASE_EXT, pmp);
  277                         while (*c != '\0') {
  278                                 *un++ = *c++;
  279                                 thislong++;
  280                         }
  281                 }
  282         }
  283         *un++ = 0;
  284 
  285         return (thislong);
  286 }
  287 
  288 /*
  289  * Convert a unix filename to a DOS filename according to Win95 rules.
  290  * If applicable and gen is not 0, it is inserted into the converted
  291  * filename as a generation number.
  292  * Returns
  293  *      0 if name couldn't be converted
  294  *      1 if the converted name is the same as the original
  295  *        (no long filename entry necessary for Win95)
  296  *      2 if conversion was successful
  297  *      3 if conversion was successful and generation number was inserted
  298  */
  299 int
  300 unix2dosfn(const u_char *un, u_char dn[12], size_t unlen, u_int gen,
  301     struct msdosfsmount *pmp)
  302 {
  303         ssize_t i, j;
  304         int l;
  305         int conv = 1;
  306         const u_char *cp, *dp, *dp1;
  307         u_char gentext[6], *wcp;
  308         uint16_t c;
  309 
  310         /*
  311          * Fill the dos filename string with blanks. These are DOS's pad
  312          * characters.
  313          */
  314         for (i = 0; i < 11; i++)
  315                 dn[i] = ' ';
  316         dn[11] = 0;
  317 
  318         /*
  319          * The filenames "." and ".." are handled specially, since they
  320          * don't follow dos filename rules.
  321          */
  322         if (un[0] == '.' && unlen == 1) {
  323                 dn[0] = '.';
  324                 return gen <= 1;
  325         }
  326         if (un[0] == '.' && un[1] == '.' && unlen == 2) {
  327                 dn[0] = '.';
  328                 dn[1] = '.';
  329                 return gen <= 1;
  330         }
  331 
  332         /*
  333          * Filenames with only blanks and dots are not allowed!
  334          */
  335         for (cp = un, i = unlen; --i >= 0; cp++)
  336                 if (*cp != ' ' && *cp != '.')
  337                         break;
  338         if (i < 0)
  339                 return 0;
  340 
  341 
  342         /*
  343          * Filenames with some characters are not allowed!
  344          */
  345         for (cp = un, i = unlen; i > 0;)
  346                 if (unix2doschr(&cp, (size_t *)&i, pmp) == 0)
  347                         return 0;
  348 
  349         /*
  350          * Now find the extension
  351          * Note: dot as first char doesn't start extension
  352          *       and trailing dots and blanks are ignored
  353          * Note(2003/7): It seems recent Windows has
  354          *       defferent rule than this code, that Windows
  355          *       ignores all dots before extension, and use all
  356          *       chars as filename except for dots.
  357          */
  358         dp = dp1 = NULL;
  359         for (cp = un + 1, i = unlen - 1; --i >= 0;) {
  360                 switch (*cp++) {
  361                 case '.':
  362                         if (!dp1)
  363                                 dp1 = cp;
  364                         break;
  365                 case ' ':
  366                         break;
  367                 default:
  368                         if (dp1)
  369                                 dp = dp1;
  370                         dp1 = NULL;
  371                         break;
  372                 }
  373         }
  374 
  375         /*
  376          * Now convert it (this part is for extension).
  377          * As Windows XP do, if it's not ascii char,
  378          * this function should return 2 or 3, so that checkng out Unicode name.
  379          */
  380         if (dp) {
  381                 if (dp1)
  382                         l = dp1 - dp;
  383                 else
  384                         l = unlen - (dp - un);
  385                 for (cp = dp, i = l, j = 8; i > 0 && j < 11; j++) {
  386                         c = unix2doschr(&cp, (size_t *)&i, pmp);
  387                         if (c & 0xff00) {
  388                                 dn[j] = c >> 8;
  389                                 if (++j < 11) {
  390                                         dn[j] = c;
  391                                         if (conv != 3)
  392                                                 conv = 2;
  393                                         continue;
  394                                 } else {
  395                                         conv = 3;
  396                                         dn[j-1] = ' ';
  397                                         break;
  398                                 }
  399                         } else {
  400                                 dn[j] = c;
  401                         }
  402                         if (((dn[j] & 0x80) || *(cp - 1) != dn[j]) && conv != 3)
  403                                 conv = 2;
  404                         if (dn[j] == 1) {
  405                                 conv = 3;
  406                                 dn[j] = '_';
  407                         }
  408                         if (dn[j] == 2) {
  409                                 conv = 3;
  410                                 dn[j--] = ' ';
  411                         }
  412                 }
  413                 if (i > 0)
  414                         conv = 3;
  415                 dp--;
  416         } else {
  417                 for (dp = cp; *--dp == ' ' || *dp == '.';);
  418                 dp++;
  419         }
  420 
  421         /*
  422          * Now convert the rest of the name
  423          */
  424         for (i = dp - un, j = 0; un < dp && j < 8; j++) {
  425                 c = unix2doschr(&un, &i, pmp);
  426                 if (c & 0xff00) {
  427                         dn[j] = c >> 8;
  428                         if (++j < 8) {
  429                                 dn[j] = c;
  430                                 if (conv != 3)
  431                                         conv = 2;
  432                                 continue;
  433                         } else {
  434                                 conv = 3;
  435                                 dn[j-1] = ' ';
  436                                 break;
  437                         }
  438                 } else {
  439                         dn[j] = c;
  440                 }
  441                 if (((dn[j] & 0x80) || *(un - 1) != dn[j]) && conv != 3)
  442                         conv = 2;
  443                 if (dn[j] == 1) {
  444                         conv = 3;
  445                         dn[j] = '_';
  446                 }
  447                 if (dn[j] == 2) {
  448                         conv = 3;
  449                         dn[j--] = ' ';
  450                 }
  451         }
  452         if (un < dp)
  453                 conv = 3;
  454         /*
  455          * If we didn't have any chars in filename,
  456          * generate a default
  457          */
  458         if (!j)
  459                 dn[0] = '_';
  460 
  461         /*
  462          * If there wasn't any char dropped,
  463          * there is no place for generation numbers
  464          */
  465         if (conv != 3) {
  466                 if (gen > 1)
  467                         conv = 0;
  468                 goto done;
  469         }
  470 
  471         /*
  472          * Now insert the generation number into the filename part
  473          */
  474         if (gen == 0)
  475                 goto done;
  476         for (wcp = gentext + sizeof(gentext); wcp > gentext && gen; gen /= 10)
  477                 *--wcp = gen % 10 + '';
  478         if (gen) {
  479                 conv = 0;
  480                 goto done;
  481         }
  482         for (i = 8; dn[--i] == ' ';);
  483         i++;
  484         if (gentext + sizeof(gentext) - wcp + 1 > 8 - i)
  485                 i = 8 - (gentext + sizeof(gentext) - wcp + 1);
  486         /*
  487          * Correct posision to where insert the generation number
  488          */
  489         cp = dn;
  490         i -= mbsadjpos((const char**)&cp, i, unlen, 1, pmp->pm_flags, pmp->pm_d2u);
  491 
  492         dn[i++] = '~';
  493         while (wcp < gentext + sizeof(gentext))
  494                 dn[i++] = *wcp++;
  495 
  496         /*
  497          * Tail of the filename should be space
  498          */
  499         while (i < 8)
  500                 dn[i++] = ' ';
  501         conv = 3;
  502 
  503 done:
  504         /*
  505          * The first character cannot be E5,
  506          * because that means a deleted entry
  507          */
  508         if (dn[0] == 0xe5)
  509                 dn[0] = SLOT_E5;
  510 
  511         return conv;
  512 }
  513 
  514 /*
  515  * Create a Win95 long name directory entry
  516  * Note: assumes that the filename is valid,
  517  *       i.e. doesn't consist solely of blanks and dots
  518  */
  519 int
  520 unix2winfn(const u_char *un, size_t unlen, struct winentry *wep, int cnt,
  521     int chksum, struct msdosfsmount *pmp)
  522 {
  523         uint8_t *wcp;
  524         int i, end;
  525         uint16_t code;
  526 
  527         /*
  528          * Drop trailing blanks and dots
  529          */
  530         unlen = winLenFixup(un, unlen);
  531 
  532         /*
  533          * Cut *un for this slot
  534          */
  535         unlen = mbsadjpos((const char **)&un, unlen, (cnt - 1) * WIN_CHARS, 2,
  536                           pmp->pm_flags, pmp->pm_u2w);
  537 
  538         /*
  539          * Initialize winentry to some useful default
  540          */
  541         memset(wep, 0xff, sizeof(*wep));
  542         wep->weCnt = cnt;
  543         wep->weAttributes = ATTR_WIN95;
  544         wep->weReserved1 = 0;
  545         wep->weChksum = chksum;
  546         wep->weReserved2 = 0;
  547 
  548         /*
  549          * Now convert the filename parts
  550          */
  551         end = 0;
  552         for (wcp = wep->wePart1, i = sizeof(wep->wePart1)/2; --i >= 0 && !end;) {
  553                 code = unix2winchr(&un, &unlen, 0, pmp);
  554                 *wcp++ = code;
  555                 *wcp++ = code >> 8;
  556                 if (!code)
  557                         end = WIN_LAST;
  558         }
  559         for (wcp = wep->wePart2, i = sizeof(wep->wePart2)/2; --i >= 0 && !end;) {
  560                 code = unix2winchr(&un, &unlen, 0, pmp);
  561                 *wcp++ = code;
  562                 *wcp++ = code >> 8;
  563                 if (!code)
  564                         end = WIN_LAST;
  565         }
  566         for (wcp = wep->wePart3, i = sizeof(wep->wePart3)/2; --i >= 0 && !end;) {
  567                 code = unix2winchr(&un, &unlen, 0, pmp);
  568                 *wcp++ = code;
  569                 *wcp++ = code >> 8;
  570                 if (!code)
  571                         end = WIN_LAST;
  572         }
  573         if (!unlen)
  574                 end = WIN_LAST;
  575         wep->weCnt |= end;
  576         return !end;
  577 }
  578 
  579 /*
  580  * Compare our filename to the one in the Win95 entry
  581  * Returns the checksum or -1 if no match
  582  */
  583 int
  584 winChkName(struct mbnambuf *nbp, const u_char *un, size_t unlen, int chksum,
  585     struct msdosfsmount *pmp)
  586 {
  587         size_t len;
  588         uint16_t c1, c2;
  589         u_char *np;
  590         struct dirent dirbuf;
  591 
  592         /*
  593          * We already have winentry in *nbp.
  594          */
  595         if (!mbnambuf_flush(nbp, &dirbuf) || dirbuf.d_namlen == 0)
  596                 return -1;
  597 
  598 #ifdef MSDOSFS_DEBUG
  599         printf("winChkName(): un=%s:%zu,d_name=%s:%d\n", un, unlen,
  600                                                         dirbuf.d_name,
  601                                                         dirbuf.d_namlen);
  602 #endif
  603 
  604         /*
  605          * Compare the name parts
  606          */
  607         len = dirbuf.d_namlen;
  608         if (unlen != len)
  609                 return -2;
  610 
  611         for (np = dirbuf.d_name; unlen > 0 && len > 0;) {
  612                 /*
  613                  * Comparison must be case insensitive, because FAT disallows
  614                  * to look up or create files in case sensitive even when
  615                  * it's a long file name.
  616                  */
  617                 c1 = unix2winchr(__DECONST(const u_char **, &np), &len,
  618                     LCASE_BASE, pmp);
  619                 c2 = unix2winchr(&un, &unlen, LCASE_BASE, pmp);
  620                 if (c1 != c2)
  621                         return -2;
  622         }
  623         return chksum;
  624 }
  625 
  626 /*
  627  * Convert Win95 filename to dirbuf.
  628  * Returns the checksum or -1 if impossible
  629  */
  630 int
  631 win2unixfn(struct mbnambuf *nbp, struct winentry *wep, int chksum,
  632     struct msdosfsmount *pmp)
  633 {
  634         u_char *c, tmpbuf[5];
  635         uint8_t *cp;
  636         uint8_t *np, name[WIN_CHARS * 3 + 1];
  637         uint16_t code;
  638         int i;
  639 
  640         if ((wep->weCnt&WIN_CNT) > howmany(WIN_MAXLEN, WIN_CHARS)
  641             || !(wep->weCnt&WIN_CNT))
  642                 return -1;
  643 
  644         /*
  645          * First compare checksums
  646          */
  647         if (wep->weCnt&WIN_LAST) {
  648                 chksum = wep->weChksum;
  649         } else if (chksum != wep->weChksum)
  650                 chksum = -1;
  651         if (chksum == -1)
  652                 return -1;
  653 
  654         /*
  655          * Convert the name parts
  656          */
  657         np = name;
  658         for (cp = wep->wePart1, i = sizeof(wep->wePart1)/2; --i >= 0;) {
  659                 code = (cp[1] << 8) | cp[0];
  660                 switch (code) {
  661                 case 0:
  662                         *np = '\0';
  663                         if (mbnambuf_write(nbp, name,
  664                             (wep->weCnt & WIN_CNT) - 1) != 0)
  665                                 return -1;
  666                         return chksum;
  667                 case '/':
  668                         *np = '\0';
  669                         return -1;
  670                 default:
  671                         c = win2unixchr(tmpbuf, code, pmp);
  672                         while (*c != '\0')
  673                                 *np++ = *c++;
  674                         break;
  675                 }
  676                 cp += 2;
  677         }
  678         for (cp = wep->wePart2, i = sizeof(wep->wePart2)/2; --i >= 0;) {
  679                 code = (cp[1] << 8) | cp[0];
  680                 switch (code) {
  681                 case 0:
  682                         *np = '\0';
  683                         if (mbnambuf_write(nbp, name,
  684                             (wep->weCnt & WIN_CNT) - 1) != 0)
  685                                 return -1;
  686                         return chksum;
  687                 case '/':
  688                         *np = '\0';
  689                         return -1;
  690                 default:
  691                         c = win2unixchr(tmpbuf, code, pmp);
  692                         while (*c != '\0')
  693                                 *np++ = *c++;
  694                         break;
  695                 }
  696                 cp += 2;
  697         }
  698         for (cp = wep->wePart3, i = sizeof(wep->wePart3)/2; --i >= 0;) {
  699                 code = (cp[1] << 8) | cp[0];
  700                 switch (code) {
  701                 case 0:
  702                         *np = '\0';
  703                         if (mbnambuf_write(nbp, name,
  704                             (wep->weCnt & WIN_CNT) - 1) != 0)
  705                                 return -1;
  706                         return chksum;
  707                 case '/':
  708                         *np = '\0';
  709                         return -1;
  710                 default:
  711                         c = win2unixchr(tmpbuf, code, pmp);
  712                         while (*c != '\0')
  713                                 *np++ = *c++;
  714                         break;
  715                 }
  716                 cp += 2;
  717         }
  718         *np = '\0';
  719         if (mbnambuf_write(nbp, name, (wep->weCnt & WIN_CNT) - 1) != 0)
  720                 return -1;
  721         return chksum;
  722 }
  723 
  724 /*
  725  * Compute the unrolled checksum of a DOS filename for Win95 LFN use.
  726  */
  727 uint8_t
  728 winChksum(uint8_t *name)
  729 {
  730         int i;
  731         uint8_t s;
  732 
  733         for (s = 0, i = 11; --i >= 0; s += *name++)
  734                 s = (s << 7)|(s >> 1);
  735         return (s);
  736 }
  737 
  738 /*
  739  * Determine the number of slots necessary for Win95 names
  740  */
  741 int
  742 winSlotCnt(const u_char *un, size_t unlen, struct msdosfsmount *pmp)
  743 {
  744         size_t wlen;
  745         char wn[WIN_MAXLEN * 2 + 1], *wnp;
  746 
  747         unlen = winLenFixup(un, unlen);
  748 
  749         if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdosfs_iconv) {
  750                 wlen = WIN_MAXLEN * 2;
  751                 wnp = wn;
  752                 msdosfs_iconv->conv(pmp->pm_u2w, (const char **)&un, &unlen, &wnp, &wlen);
  753                 if (unlen > 0)
  754                         return 0;
  755                 return howmany(WIN_MAXLEN - wlen/2, WIN_CHARS);
  756         }
  757 
  758         if (unlen > WIN_MAXLEN)
  759                 return 0;
  760         return howmany(unlen, WIN_CHARS);
  761 }
  762 
  763 /*
  764  * Determine the number of bytes necessary for Win95 names
  765  */
  766 size_t
  767 winLenFixup(const u_char *un, size_t unlen)
  768 {
  769         for (un += unlen; unlen > 0; unlen--)
  770                 if (*--un != ' ' && *un != '.')
  771                         break;
  772         return unlen;
  773 }
  774 
  775 /*
  776  * Store an area with multi byte string instr, and returns left
  777  * byte of instr and moves pointer forward. The area's size is
  778  * inlen or outlen.
  779  */
  780 static int
  781 mbsadjpos(const char **instr, size_t inlen, size_t outlen, int weight, int flag, void *handle)
  782 {
  783         char *outp, outstr[outlen * weight + 1];
  784 
  785         if (flag & MSDOSFSMNT_KICONV && msdosfs_iconv) {
  786                 outp = outstr;
  787                 outlen *= weight;
  788                 msdosfs_iconv->conv(handle, instr, &inlen, &outp, &outlen);
  789                 return (inlen);
  790         }
  791 
  792         (*instr) += min(inlen, outlen);
  793         return (inlen - min(inlen, outlen));
  794 }
  795 
  796 /*
  797  * Convert DOS char to Local char
  798  */
  799 static u_char *
  800 dos2unixchr(u_char *outbuf, const u_char **instr, size_t *ilen, int lower, struct msdosfsmount *pmp)
  801 {
  802         u_char c, *outp;
  803         size_t len, olen;
  804 
  805         outp = outbuf;
  806         if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdosfs_iconv) {
  807                 olen = len = 4;
  808 
  809                 if (lower & (LCASE_BASE | LCASE_EXT))
  810                         msdosfs_iconv->convchr_case(pmp->pm_d2u, (const char **)instr,
  811                                                   ilen, (char **)&outp, &olen, KICONV_LOWER);
  812                 else
  813                         msdosfs_iconv->convchr(pmp->pm_d2u, (const char **)instr,
  814                                              ilen, (char **)&outp, &olen);
  815                 len -= olen;
  816 
  817                 /*
  818                  * return '?' if failed to convert
  819                  */
  820                 if (len == 0) {
  821                         (*ilen)--;
  822                         (*instr)++;
  823                         *outp++ = '?';
  824                 }
  825         } else {
  826                 (*ilen)--;
  827                 c = *(*instr)++;
  828                 c = dos2unix[c];
  829                 if (lower & (LCASE_BASE | LCASE_EXT))
  830                         c = u2l[c];
  831                 *outp++ = c;
  832                 outbuf[1] = '\0';
  833         }
  834 
  835         *outp = '\0';
  836         outp = outbuf;
  837         return (outp);
  838 }
  839 
  840 /*
  841  * Convert Local char to DOS char
  842  */
  843 static uint16_t
  844 unix2doschr(const u_char **instr, size_t *ilen, struct msdosfsmount *pmp)
  845 {
  846         u_char c;
  847         char *up, *outp, unicode[3], outbuf[3];
  848         uint16_t wc;
  849         size_t len, ucslen, unixlen, olen;
  850 
  851         if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdosfs_iconv) {
  852                 /*
  853                  * to hide an invisible character, using a unicode filter
  854                  */
  855                 ucslen = 2;
  856                 len = *ilen;
  857                 up = unicode;
  858                 msdosfs_iconv->convchr(pmp->pm_u2w, (const char **)instr,
  859                                      ilen, &up, &ucslen);
  860                 unixlen = len - *ilen;
  861 
  862                 /*
  863                  * cannot be converted
  864                  */
  865                 if (unixlen == 0) {
  866                         (*ilen)--;
  867                         (*instr)++;
  868                         return (0);
  869                 }
  870 
  871                 /*
  872                  * return magic number for ascii char
  873                  */
  874                 if (unixlen == 1) {
  875                         c = *(*instr -1);
  876                         if (! (c & 0x80)) {
  877                                 c = unix2dos[c];
  878                                 if (c <= 2)
  879                                         return (c);
  880                         }
  881                 }
  882 
  883                 /*
  884                  * now convert using libiconv
  885                  */
  886                 *instr -= unixlen;
  887                 *ilen = len;
  888 
  889                 olen = len = 2;
  890                 outp = outbuf;
  891                 msdosfs_iconv->convchr_case(pmp->pm_u2d, (const char **)instr,
  892                                           ilen, &outp, &olen, KICONV_FROM_UPPER);
  893                 len -= olen;
  894 
  895                 /*
  896                  * cannot be converted, but has unicode char, should return magic number
  897                  */
  898                 if (len == 0) {
  899                         (*ilen) -= unixlen;
  900                         (*instr) += unixlen;
  901                         return (1);
  902                 }
  903 
  904                 wc = 0;
  905                 while(len--)
  906                         wc |= (*(outp - len - 1) & 0xff) << (len << 3);
  907                 return (wc);
  908         }
  909 
  910         (*ilen)--;
  911         c = *(*instr)++;
  912         c = l2u[c];
  913         c = unix2dos[c];
  914         return ((uint16_t)c);
  915 }
  916 
  917 /*
  918  * Convert Windows char to Local char
  919  */
  920 static u_char *
  921 win2unixchr(u_char *outbuf, uint16_t wc, struct msdosfsmount *pmp)
  922 {
  923         u_char *inp, *outp, inbuf[3];
  924         size_t ilen, olen, len;
  925 
  926         outp = outbuf;
  927         if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdosfs_iconv) {
  928                 inbuf[0] = (u_char)(wc>>8);
  929                 inbuf[1] = (u_char)wc;
  930                 inbuf[2] = '\0';
  931 
  932                 ilen = 2;
  933                 olen = len = 4;
  934                 inp = inbuf;
  935                 msdosfs_iconv->convchr(pmp->pm_w2u, __DECONST(const char **,
  936                     &inp), &ilen, (char **)&outp, &olen);
  937                 len -= olen;
  938 
  939                 /*
  940                  * return '?' if failed to convert
  941                  */
  942                 if (len == 0)
  943                         *outp++ = '?';
  944         } else {
  945                 *outp++ = (wc & 0xff00) ? '?' : (u_char)(wc & 0xff);
  946         }
  947 
  948         *outp = '\0';
  949         outp = outbuf;
  950         return (outp);
  951 }
  952 
  953 /*
  954  * Convert Local char to Windows char
  955  */
  956 static uint16_t
  957 unix2winchr(const u_char **instr, size_t *ilen, int lower, struct msdosfsmount *pmp)
  958 {
  959         u_char *outp, outbuf[3];
  960         uint16_t wc;
  961         size_t olen;
  962 
  963         if (*ilen == 0)
  964                 return (0);
  965 
  966         if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdosfs_iconv) {
  967                 outp = outbuf;
  968                 olen = 2;
  969                 if (lower & (LCASE_BASE | LCASE_EXT))
  970                         msdosfs_iconv->convchr_case(pmp->pm_u2w, (const char **)instr,
  971                                                   ilen, (char **)&outp, &olen,
  972                                                   KICONV_FROM_LOWER);
  973                 else
  974                         msdosfs_iconv->convchr(pmp->pm_u2w, (const char **)instr,
  975                                              ilen, (char **)&outp, &olen);
  976 
  977                 /*
  978                  * return '' if end of filename
  979                  */
  980                 if (olen == 2)
  981                         return (0);
  982 
  983                 wc = (outbuf[0]<<8) | outbuf[1];
  984 
  985                 return (wc);
  986         }
  987 
  988         (*ilen)--;
  989         wc = (*instr)[0];
  990         if (lower & (LCASE_BASE | LCASE_EXT))
  991                 wc = u2l[wc];
  992         (*instr)++;
  993         return (wc);
  994 }
  995 
  996 /*
  997  * Initialize the temporary concatenation buffer.
  998  */
  999 void
 1000 mbnambuf_init(struct mbnambuf *nbp)
 1001 {
 1002 
 1003         nbp->nb_len = 0;
 1004         nbp->nb_last_id = -1;
 1005         nbp->nb_buf[sizeof(nbp->nb_buf) - 1] = '\0';
 1006 }
 1007 
 1008 /*
 1009  * Fill out our concatenation buffer with the given substring, at the offset
 1010  * specified by its id.  Since this function must be called with ids in
 1011  * descending order, we take advantage of the fact that ASCII substrings are
 1012  * exactly WIN_CHARS in length.  For non-ASCII substrings, we shift all
 1013  * previous (i.e. higher id) substrings upwards to make room for this one.
 1014  * This only penalizes portions of substrings that contain more than
 1015  * WIN_CHARS bytes when they are first encountered.
 1016  */
 1017 int
 1018 mbnambuf_write(struct mbnambuf *nbp, char *name, int id)
 1019 {
 1020         char *slot;
 1021         size_t count, newlen;
 1022 
 1023         if (nbp->nb_len != 0 && id != nbp->nb_last_id - 1) {
 1024 #ifdef MSDOSFS_DEBUG
 1025                 printf("msdosfs: non-decreasing id: id %d, last id %d\n",
 1026                     id, nbp->nb_last_id);
 1027 #endif
 1028                 return (EINVAL);
 1029         }
 1030 
 1031         /* Will store this substring in a WIN_CHARS-aligned slot. */
 1032         slot = &nbp->nb_buf[id * WIN_CHARS];
 1033         count = strlen(name);
 1034         newlen = nbp->nb_len + count;
 1035         if (newlen > WIN_MAXLEN || newlen > MAXNAMLEN) {
 1036 #ifdef MSDOSFS_DEBUG
 1037                 printf("msdosfs: file name length %zu too large\n", newlen);
 1038 #endif
 1039                 return (ENAMETOOLONG);
 1040         }
 1041 
 1042         /* Shift suffix upwards by the amount length exceeds WIN_CHARS. */
 1043         if (count > WIN_CHARS && nbp->nb_len != 0) {
 1044                 if ((id * WIN_CHARS + count + nbp->nb_len) >
 1045                     sizeof(nbp->nb_buf))
 1046                         return (ENAMETOOLONG);
 1047 
 1048                 memmove(slot + count, slot + WIN_CHARS, nbp->nb_len);
 1049         }
 1050 
 1051         /* Copy in the substring to its slot and update length so far. */
 1052         memcpy(slot, name, count);
 1053         nbp->nb_len = newlen;
 1054         nbp->nb_last_id = id;
 1055 
 1056         return (0);
 1057 }
 1058 
 1059 /*
 1060  * Take the completed string and use it to setup the struct dirent.
 1061  * Be sure to always nul-terminate the d_name and then copy the string
 1062  * from our buffer.  Note that this function assumes the full string has
 1063  * been reassembled in the buffer.  If it's called before all substrings
 1064  * have been written via mbnambuf_write(), the result will be incorrect.
 1065  */
 1066 char *
 1067 mbnambuf_flush(struct mbnambuf *nbp, struct dirent *dp)
 1068 {
 1069 
 1070         if (nbp->nb_len > sizeof(dp->d_name) - 1) {
 1071                 mbnambuf_init(nbp);
 1072                 return (NULL);
 1073         }
 1074         memcpy(dp->d_name, &nbp->nb_buf[0], nbp->nb_len);
 1075         dp->d_name[nbp->nb_len] = '\0';
 1076         dp->d_namlen = nbp->nb_len;
 1077 
 1078         mbnambuf_init(nbp);
 1079         return (dp->d_name);
 1080 }

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