sys/vfs/msdosfs/msdosfs_conv.c

   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/kernel.h>         /* defines tz */
  55 #include <sys/systm.h>
  56 #include <machine/clock.h>
  57 #include <sys/dirent.h>
  58 #include <sys/iconv.h>
  59 #include <sys/mount.h>
  60
  61 #include <vfs/msdosfs/bpb.h>
  62 #include <vfs/msdosfs/direntry.h>
  63 #include <vfs/msdosfs/msdosfsmount.h>
  64
  65 extern struct iconv_functions *msdos_iconv;
  66
  67 static int mbsadjpos(const char **, size_t, size_t, int, int, void *);
  68 static uint16_t dos2unixchr(u_char *, const u_char **, size_t *, int,
  69     struct msdosfsmount *);
  70 static uint16_t unix2doschr(const u_char **, size_t *, struct msdosfsmount *);
  71 static uint16_t win2unixchr(u_char *, uint16_t, struct msdosfsmount *);
  72 static uint16_t unix2winchr(const u_char **, size_t *, int,
  73     struct msdosfsmount *);
  74
  75 /*
  76  * 0 - character disallowed in long file name.
  77  * 1 - character should be replaced by '_' in DOS file name,
  78  *     and generation number inserted.
  79  * 2 - character ('.' and ' ') should be skipped in DOS file name,
  80  *     and generation number inserted.
  81  */
  82 static const u_char
  83 unix2dos[256] = {
  84 /* iso8859-1 -> cp850 */
  85         0,    0,    0,    0,    0,    0,    0,    0,    /* 00-07 */
  86         0,    0,    0,    0,    0,    0,    0,    0,    /* 08-0f */
  87         0,    0,    0,    0,    0,    0,    0,    0,    /* 10-17 */
  88         0,    0,    0,    0,    0,    0,    0,    0,    /* 18-1f */
  89         2,    0x21, 0,    0x23, 0x24, 0x25, 0x26, 0x27, /* 20-27 */
  90         0x28, 0x29, 0,    1,    1,    0x2d, 2,    0,    /* 28-2f */
  91         0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 30-37 */
  92         0x38, 0x39, 0,    1,    0,    1,    0,    0,    /* 38-3f */
  93         0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 40-47 */
  94         0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 48-4f */
  95         0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 50-57 */
  96         0x58, 0x59, 0x5a, 1,    0,    1,    0x5e, 0x5f, /* 58-5f */
  97         0x60, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 60-67 */
  98         0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 68-6f */
  99         0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 70-77 */
 100         0x58, 0x59, 0x5a, 0x7b, 0,    0x7d, 0x7e, 0,    /* 78-7f */
 101         0,    0,    0,    0,    0,    0,    0,    0,    /* 80-87 */
 102         0,    0,    0,    0,    0,    0,    0,    0,    /* 88-8f */
 103         0,    0,    0,    0,    0,    0,    0,    0,    /* 90-97 */
 104         0,    0,    0,    0,    0,    0,    0,    0,    /* 98-9f */
 105         0,    0xad, 0xbd, 0x9c, 0xcf, 0xbe, 0xdd, 0xf5, /* a0-a7 */
 106         0xf9, 0xb8, 0xa6, 0xae, 0xaa, 0xf0, 0xa9, 0xee, /* a8-af */
 107         0xf8, 0xf1, 0xfd, 0xfc, 0xef, 0xe6, 0xf4, 0xfa, /* b0-b7 */
 108         0xf7, 0xfb, 0xa7, 0xaf, 0xac, 0xab, 0xf3, 0xa8, /* b8-bf */
 109         0xb7, 0xb5, 0xb6, 0xc7, 0x8e, 0x8f, 0x92, 0x80, /* c0-c7 */
 110         0xd4, 0x90, 0xd2, 0xd3, 0xde, 0xd6, 0xd7, 0xd8, /* c8-cf */
 111         0xd1, 0xa5, 0xe3, 0xe0, 0xe2, 0xe5, 0x99, 0x9e, /* d0-d7 */
 112         0x9d, 0xeb, 0xe9, 0xea, 0x9a, 0xed, 0xe8, 0xe1, /* d8-df */
 113         0xb7, 0xb5, 0xb6, 0xc7, 0x8e, 0x8f, 0x92, 0x80, /* e0-e7 */
 114         0xd4, 0x90, 0xd2, 0xd3, 0xde, 0xd6, 0xd7, 0xd8, /* e8-ef */
 115         0xd1, 0xa5, 0xe3, 0xe0, 0xe2, 0xe5, 0x99, 0xf6, /* f0-f7 */
 116         0x9d, 0xeb, 0xe9, 0xea, 0x9a, 0xed, 0xe8, 0x98, /* f8-ff */
 117 };
 118
 119 static const u_char
 120 dos2unix[256] = {
 121 /* cp850 -> iso8859-1 */
 122         0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, /* 00-07 */
 123         0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, /* 08-0f */
 124         0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, /* 10-17 */
 125         0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, /* 18-1f */
 126         0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 20-27 */
 127         0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 28-2f */
 128         0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 30-37 */
 129         0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 38-3f */
 130         0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 40-47 */
 131         0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 48-4f */
 132         0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 50-57 */
 133         0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 58-5f */
 134         0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 60-67 */
 135         0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 68-6f */
 136         0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 70-77 */
 137         0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 78-7f */
 138         0xc7, 0xfc, 0xe9, 0xe2, 0xe4, 0xe0, 0xe5, 0xe7, /* 80-87 */
 139         0xea, 0xeb, 0xe8, 0xef, 0xee, 0xec, 0xc4, 0xc5, /* 88-8f */
 140         0xc9, 0xe6, 0xc6, 0xf4, 0xf6, 0xf2, 0xfb, 0xf9, /* 90-97 */
 141         0xff, 0xd6, 0xdc, 0xf8, 0xa3, 0xd8, 0xd7, 0x3f, /* 98-9f */
 142         0xe1, 0xed, 0xf3, 0xfa, 0xf1, 0xd1, 0xaa, 0xba, /* a0-a7 */
 143         0xbf, 0xae, 0xac, 0xbd, 0xbc, 0xa1, 0xab, 0xbb, /* a8-af */
 144         0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0xc1, 0xc2, 0xc0, /* b0-b7 */
 145         0xa9, 0x3f, 0x3f, 0x3f, 0x3f, 0xa2, 0xa5, 0x3f, /* b8-bf */
 146         0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0xe3, 0xc3, /* c0-c7 */
 147         0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0xa4, /* c8-cf */
 148         0xf0, 0xd0, 0xca, 0xcb, 0xc8, 0x3f, 0xcd, 0xce, /* d0-d7 */
 149         0xcf, 0x3f, 0x3f, 0x3f, 0x3f, 0xa6, 0xcc, 0x3f, /* d8-df */
 150         0xd3, 0xdf, 0xd4, 0xd2, 0xf5, 0xd5, 0xb5, 0xfe, /* e0-e7 */
 151         0xde, 0xda, 0xdb, 0xd9, 0xfd, 0xdd, 0xaf, 0x3f, /* e8-ef */
 152         0xad, 0xb1, 0x3f, 0xbe, 0xb6, 0xa7, 0xf7, 0xb8, /* f0-f7 */
 153         0xb0, 0xa8, 0xb7, 0xb9, 0xb3, 0xb2, 0x3f, 0x3f, /* f8-ff */
 154 };
 155
 156 static const u_char
 157 u2l[256] = {
 158 /* tolower */
 159         0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 00-07 */
 160         0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 08-0f */
 161         0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 10-17 */
 162         0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /* 18-1f */
 163         0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 20-27 */
 164         0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 28-2f */
 165         0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 30-37 */
 166         0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 38-3f */
 167         0x40, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 40-47 */
 168         0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 48-4f */
 169         0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 50-57 */
 170         0x78, 0x79, 0x7a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 58-5f */
 171         0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 60-67 */
 172         0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 68-6f */
 173         0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 70-77 */
 174         0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 78-7f */
 175         0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, /* 80-87 */
 176         0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, /* 88-8f */
 177         0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, /* 90-97 */
 178         0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, /* 98-9f */
 179         0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, /* a0-a7 */
 180         0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, /* a8-af */
 181         0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, /* b0-b7 */
 182         0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, /* b8-bf */
 183         0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* c0-c7 */
 184         0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* c8-cf */
 185         0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xd7, /* d0-d7 */
 186         0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xdf, /* d8-df */
 187         0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* e0-e7 */
 188         0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* e8-ef */
 189         0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, /* f0-f7 */
 190         0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, /* f8-ff */
 191 };
 192
 193 static const u_char
 194 l2u[256] = {
 195 /* toupper */
 196         0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 00-07 */
 197         0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 08-0f */
 198         0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 10-17 */
 199         0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /* 18-1f */
 200         0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 20-27 */
 201         0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 28-2f */
 202         0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 30-37 */
 203         0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 38-3f */
 204         0x40, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 40-47 */
 205         0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 48-4f */
 206         0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 50-57 */
 207         0x78, 0x79, 0x7a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 58-5f */
 208         0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 60-67 */
 209         0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 68-6f */
 210         0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 70-77 */
 211         0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 78-7f */
 212         0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, /* 80-87 */
 213         0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, /* 88-8f */
 214         0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, /* 90-97 */
 215         0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, /* 98-9f */
 216         0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, /* a0-a7 */
 217         0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, /* a8-af */
 218         0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, /* b0-b7 */
 219         0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, /* b8-bf */
 220         0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* c0-c7 */
 221         0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* c8-cf */
 222         0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xd7, /* d0-d7 */
 223         0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xdf, /* d8-df */
 224         0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* e0-e7 */
 225         0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* e8-ef */
 226         0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, /* f0-f7 */
 227         0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, /* f8-ff */
 228 };
 229
 230 /*
 231  * DOS filenames are made of 2 parts, the name part and the extension part.
 232  * The name part is 8 characters long and the extension part is 3
 233  * characters long.  They may contain trailing blanks if the name or
 234  * extension are not long enough to fill their respective fields.
 235  */
 236
 237 /*
 238  * Convert a DOS filename to a unix filename. And, return the number of
 239  * characters in the resulting unix filename excluding the terminating
 240  * null.
 241  */
 242 int
 243 dos2unixfn(u_char dn[11], u_char *un, int lower, struct msdosfsmount *pmp)
 244 {
 245         size_t i;
 246         int thislong = 0;
 247         u_char c, tmpbuf[5];
 248
 249         /*
 250          * If first char of the filename is SLOT_E5 (0x05), then the real
 251          * first char of the filename should be 0xe5. But, they couldn't
 252          * just have a 0xe5 mean 0xe5 because that is used to mean a freed
 253          * directory slot. Another dos quirk.
 254          */
 255         if (*dn == SLOT_E5)
 256                 *dn = 0xe5;
 257
 258         /*
 259          * Copy the name portion into the unix filename string.
 260          */
 261         for (i = 8; i > 0 && *dn != ' ';) {
 262                 c = dos2unixchr(tmpbuf, __DECONST(const u_char **, &dn), &i,
 263                     lower & LCASE_BASE, pmp);
 264                 if (c & 0xff00) {
 265                         *un++ = c >> 8;
 266                         thislong++;
 267                 }
 268                 *un++ = c;
 269                 thislong++;
 270         }
 271         dn += i;
 272
 273         /*
 274          * Now, if there is an extension then put in a period and copy in
 275          * the extension.
 276          */
 277         if (*dn != ' ') {
 278                 *un++ = '.';
 279                 thislong++;
 280                 for (i = 3; i > 0 && *dn != ' ';) {
 281                         c = dos2unixchr(tmpbuf, __DECONST(const u_char **, &dn),
 282                             &i, lower & LCASE_EXT, pmp);
 283                         if (c & 0xff00) {
 284                                 *un++ = c >> 8;
 285                                 thislong++;
 286                         }
 287                         *un++ = c;
 288                         thislong++;
 289                 }
 290         }
 291         *un++ = 0;
 292
 293         return (thislong);
 294 }
 295
 296 /*
 297  * Convert a unix filename to a DOS filename according to Win95 rules.
 298  * If applicable and gen is not 0, it is inserted into the converted
 299  * filename as a generation number.
 300  * Returns
 301  *      0 if name couldn't be converted
 302  *      1 if the converted name is the same as the original
 303  *        (no long filename entry necessary for Win95)
 304  *      2 if conversion was successful
 305  *      3 if conversion was successful and generation number was inserted
 306  */
 307 int
 308 unix2dosfn(const u_char *un, u_char dn[12], size_t unlen, u_int gen,
 309     struct msdosfsmount *pmp)
 310 {
 311         ssize_t i, j;
 312         int l;
 313         int conv = 1;
 314         const u_char *cp, *dp, *dp1;
 315         u_char gentext[6], *wcp;
 316         uint16_t c;
 317
 318         /*
 319          * Fill the dos filename string with blanks. These are DOS's pad
 320          * characters.
 321          */
 322         for (i = 0; i < 11; i++)
 323                 dn[i] = ' ';
 324         dn[11] = 0;
 325
 326         /*
 327          * The filenames "." and ".." are handled specially, since they
 328          * don't follow dos filename rules.
 329          */
 330         if (un[0] == '.' && unlen == 1) {
 331                 dn[0] = '.';
 332                 return gen <= 1;
 333         }
 334         if (un[0] == '.' && un[1] == '.' && unlen == 2) {
 335                 dn[0] = '.';
 336                 dn[1] = '.';
 337                 return gen <= 1;
 338         }
 339
 340         /*
 341          * Filenames with only blanks and dots are not allowed!
 342          */
 343         for (cp = un, i = unlen; --i >= 0; cp++)
 344                 if (*cp != ' ' && *cp != '.')
 345                         break;
 346         if (i < 0)
 347                 return 0;
 348
 349         /*
 350          * Filenames with some characters are not allowed!
 351          */
 352         for (cp = un, i = unlen; i > 0;)
 353                 if (unix2doschr(&cp, (size_t *)&i, pmp) == 0)
 354                         return 0;
 355
 356         /*
 357          * Now find the extension
 358          * Note: dot as first char doesn't start extension
 359          *       and trailing dots and blanks are ignored
 360          * Note(2003/7): It seems recent Windows has
 361          *       defferent rule than this code, that Windows
 362          *       ignores all dots before extension, and use all
 363          *       chars as filename except for dots.
 364          */
 365         dp = dp1 = NULL;
 366         for (cp = un + 1, i = unlen - 1; --i >= 0;) {
 367                 switch (*cp++) {
 368                 case '.':
 369                         if (!dp1)
 370                                 dp1 = cp;
 371                         break;
 372                 case ' ':
 373                         break;
 374                 default:
 375                         if (dp1)
 376                                 dp = dp1;
 377                         dp1 = NULL;
 378                         break;
 379                 }
 380         }
 381
 382         /*
 383          * Now convert it (this part is for extension).
 384          * As Windows XP do, if it's not ascii char,
 385          * this function should return 2 or 3, so that checkng out Unicode name.
 386          */
 387         if (dp) {
 388                 if (dp1)
 389                         l = dp1 - dp;
 390                 else
 391                         l = unlen - (dp - un);
 392                 for (cp = dp, i = l, j = 8; i > 0 && j < 11; j++) {
 393                         c = unix2doschr(&cp, (size_t *)&i, pmp);
 394                         if (c & 0xff00) {
 395                                 dn[j] = c >> 8;
 396                                 if (++j < 11) {
 397                                         dn[j] = c;
 398                                         if (conv != 3)
 399                                                 conv = 2;
 400                                         continue;
 401                                 } else {
 402                                         conv = 3;
 403                                         dn[j-1] = ' ';
 404                                         break;
 405                                 }
 406                         } else {
 407                                 dn[j] = c;
 408                         }
 409                         if (((dn[j] & 0x80) || *(cp - 1) != dn[j]) && conv != 3)
 410                                 conv = 2;
 411                         if (dn[j] == 1) {
 412                                 conv = 3;
 413                                 dn[j] = '_';
 414                         }
 415                         if (dn[j] == 2) {
 416                                 conv = 3;
 417                                 dn[j--] = ' ';
 418                         }
 419                 }
 420                 if (i > 0)
 421                         conv = 3;
 422                 dp--;
 423         } else {
 424                 for (dp = cp; *--dp == ' ' || *dp == '.';);
 425                 dp++;
 426         }
 427
 428         /*
 429          * Now convert the rest of the name
 430          */
 431         for (i = dp - un, j = 0; un < dp && j < 8; j++) {
 432                 c = unix2doschr(&un, &i, pmp);
 433                 if (c & 0xff00) {
 434                         dn[j] = c >> 8;
 435                         if (++j < 8) {
 436                                 dn[j] = c;
 437                                 if (conv != 3)
 438                                         conv = 2;
 439                                 continue;
 440                         } else {
 441                                 conv = 3;
 442                                 dn[j-1] = ' ';
 443                                 break;
 444                         }
 445                 } else {
 446                         dn[j] = c;
 447                 }
 448                 if (((dn[j] & 0x80) || *(un - 1) != dn[j]) && conv != 3)
 449                         conv = 2;
 450                 if (dn[j] == 1) {
 451                         conv = 3;
 452                         dn[j] = '_';
 453                 }
 454                 if (dn[j] == 2) {
 455                         conv = 3;
 456                         dn[j--] = ' ';
 457                 }
 458         }
 459         if (un < dp)
 460                 conv = 3;
 461         /*
 462          * If we didn't have any chars in filename,
 463          * generate a default
 464          */
 465         if (!j)
 466                 dn[0] = '_';
 467
 468         /*
 469          * If there wasn't any char dropped,
 470          * there is no place for generation numbers
 471          */
 472         if (conv != 3) {
 473                 if (gen > 1)
 474                         conv = 0;
 475                 goto done;
 476         }
 477
 478         /*
 479          * Now insert the generation number into the filename part
 480          */
 481         if (gen == 0)
 482                 goto done;
 483         for (wcp = gentext + sizeof(gentext); wcp > gentext && gen; gen /= 10)
 484                 *--wcp = gen % 10 + '0';
 485         if (gen) {
 486                 conv = 0;
 487                 goto done;
 488         }
 489         for (i = 8; dn[--i] == ' ';);
 490         i++;
 491         if (gentext + sizeof(gentext) - wcp + 1 > 8 - i)
 492                 i = 8 - (gentext + sizeof(gentext) - wcp + 1);
 493         /*
 494          * Correct posision to where insert the generation number
 495          */
 496         cp = dn;
 497         i -= mbsadjpos((const char**)&cp, i, unlen, 1, pmp->pm_flags,
 498                        pmp->pm_d2u);
 499         dn[i++] = '~';
 500         while (wcp < gentext + sizeof(gentext))
 501                 dn[i++] = *wcp++;
 502
 503         /*
 504          * Tail of the filename should be space
 505          */
 506         while (i < 8)
 507                 dn[i++] = ' ';
 508         conv = 3;
 509
 510 done:
 511         /*
 512          * The first character cannot be E5,
 513          * because that means a deleted entry
 514          */
 515         if (dn[0] == 0xe5)
 516                 dn[0] = SLOT_E5;
 517
 518         return conv;
 519 }
 520
 521 /*
 522  * Create a Win95 long name directory entry
 523  * Note: assumes that the filename is valid,
 524  *       i.e. doesn't consist solely of blanks and dots
 525  */
 526 int
 527 unix2winfn(const u_char *un, size_t unlen, struct winentry *wep, int cnt,
 528     int chksum, struct msdosfsmount *pmp)
 529 {
 530         uint8_t *wcp;
 531         int i, end;
 532         uint16_t code;
 533
 534         /*
 535          * Drop trailing blanks and dots
 536          */
 537         unlen = winLenFixup(un, unlen);
 538
 539         /*
 540          * Cut *un for this slot
 541          */
 542         unlen = mbsadjpos((const char **)&un, unlen, (cnt - 1) * WIN_CHARS, 2,
 543                           pmp->pm_flags, pmp->pm_u2w);
 544
 545         /*
 546          * Initialize winentry to some useful default
 547          */
 548         memset(wep, 0xff, sizeof(*wep));
 549         wep->weCnt = cnt;
 550         wep->weAttributes = ATTR_WIN95;
 551         wep->weReserved1 = 0;
 552         wep->weChksum = chksum;
 553         wep->weReserved2 = 0;
 554
 555         /*
 556          * Now convert the filename parts
 557          */
 558         end = 0;
 559         for (wcp = wep->wePart1, i = sizeof(wep->wePart1)/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->wePart2, i = sizeof(wep->wePart2)/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         for (wcp = wep->wePart3, i = sizeof(wep->wePart3)/2; --i >= 0 && !end;) {
 574                 code = unix2winchr(&un, &unlen, 0, pmp);
 575                 *wcp++ = code;
 576                 *wcp++ = code >> 8;
 577                 if (!code)
 578                         end = WIN_LAST;
 579         }
 580         if (!unlen)
 581                 end = WIN_LAST;
 582         wep->weCnt |= end;
 583         return !end;
 584 }
 585
 586 /*
 587  * Compare our filename to the one in the Win95 entry
 588  * Returns the checksum or -1 if no match
 589  */
 590 int
 591 winChkName(struct mbnambuf *nbp, const u_char *un, size_t unlen, int chksum,
 592     struct msdosfsmount *pmp)
 593 {
 594         size_t len;
 595         uint16_t c1, c2;
 596         u_char *np;
 597         struct dirent dirbuf;
 598
 599         /*
 600          * We already have winentry in *nbp.
 601          */
 602         if (!mbnambuf_flush(nbp, &dirbuf) || dirbuf.d_namlen == 0)
 603                 return -1;
 604         mprintf("winChkName(): un=%s:%zu,d_name=%s:%d\n",
 605                 un, unlen, dirbuf.d_name, dirbuf.d_namlen);
 606         /*
 607          * Compare the name parts
 608          */
 609         len = dirbuf.d_namlen;
 610         if (unlen != len)
 611                 return -2;
 612
 613         for (np = dirbuf.d_name; unlen > 0 && len > 0;) {
 614                 /*
 615                  * Comparison must be case insensitive, because FAT disallows
 616                  * to look up or create files in case sensitive even when
 617                  * it's a long file name.
 618                  */
 619                 c1 = unix2winchr(__DECONST(const u_char **, &np), &len,
 620                     LCASE_BASE, pmp);
 621                 c2 = unix2winchr(&un, &unlen, LCASE_BASE, pmp);
 622                 if (c1 != c2)
 623                         return -2;
 624         }
 625         return chksum;
 626 }
 627
 628 /*
 629  * Convert Win95 filename to dirbuf.
 630  * Returns the checksum or -1 if impossible
 631  */
 632 int
 633 win2unixfn(struct mbnambuf *nbp, struct winentry *wep, int chksum,
 634     struct msdosfsmount *pmp)
 635 {
 636         u_char tmpbuf[5];
 637         uint8_t *cp;
 638         uint8_t *np, name[WIN_CHARS * 2 + 1];
 639         uint16_t code;
 640         int i;
 641
 642         if ((wep->weCnt&WIN_CNT) > howmany(WIN_MAXLEN, WIN_CHARS)
 643             || !(wep->weCnt&WIN_CNT))
 644                 return -1;
 645
 646         /*
 647          * First compare checksums
 648          */
 649         if (wep->weCnt&WIN_LAST) {
 650                 chksum = wep->weChksum;
 651         } else if (chksum != wep->weChksum)
 652                 chksum = -1;
 653         if (chksum == -1)
 654                 return -1;
 655
 656         /*
 657          * Convert the name parts
 658          */
 659         np = name;
 660         for (cp = wep->wePart1, i = sizeof(wep->wePart1)/2; --i >= 0;) {
 661                 code = (cp[1] << 8) | cp[0];
 662                 switch (code) {
 663                 case 0:
 664                         *np = '\0';
 665                         if (mbnambuf_write(nbp, name,
 666                             (wep->weCnt & WIN_CNT) - 1) != 0)
 667                                 return -1;
 668                         return chksum;
 669                 case '/':
 670                         *np = '\0';
 671                         return -1;
 672                 default:
 673                         code = win2unixchr(tmpbuf, code, pmp);
 674                         if (code & 0xff00)
 675                                 *np++ = code >> 8;
 676                         *np++ = code;
 677                         break;
 678                 }
 679                 cp += 2;
 680         }
 681         for (cp = wep->wePart2, i = sizeof(wep->wePart2)/2; --i >= 0;) {
 682                 code = (cp[1] << 8) | cp[0];
 683                 switch (code) {
 684                 case 0:
 685                         *np = '\0';
 686                         if (mbnambuf_write(nbp, name,
 687                             (wep->weCnt & WIN_CNT) - 1) != 0)
 688                                 return -1;
 689                         return chksum;
 690                 case '/':
 691                         *np = '\0';
 692                         return -1;
 693                 default:
 694                         code = win2unixchr(tmpbuf, code, pmp);
 695                         if (code & 0xff00)
 696                                 *np++ = code >> 8;
 697                         *np++ = code;
 698                         break;
 699                 }
 700                 cp += 2;
 701         }
 702         for (cp = wep->wePart3, i = sizeof(wep->wePart3)/2; --i >= 0;) {
 703                 code = (cp[1] << 8) | cp[0];
 704                 switch (code) {
 705                 case 0:
 706                         *np = '\0';
 707                         if (mbnambuf_write(nbp, name,
 708                             (wep->weCnt & WIN_CNT) - 1) != 0)
 709                                 return -1;
 710                         return chksum;
 711                 case '/':
 712                         *np = '\0';
 713                         return -1;
 714                 default:
 715                         code = win2unixchr(tmpbuf, code, pmp);
 716                         if (code & 0xff00)
 717                                 *np++ = code >> 8;
 718                         *np++ = code;
 719                         break;
 720                 }
 721                 cp += 2;
 722         }
 723         *np = '\0';
 724         if (mbnambuf_write(nbp, name, (wep->weCnt & WIN_CNT) - 1) != 0)
 725                 return -1;
 726         return chksum;
 727 }
 728
 729 /*
 730  * Compute the unrolled checksum of a DOS filename for Win95 LFN use.
 731  */
 732 uint8_t
 733 winChksum(uint8_t *name)
 734 {
 735         int i;
 736         uint8_t s;
 737
 738         for (s = 0, i = 11; --i >= 0; s += *name++)
 739                 s = (s << 7)|(s >> 1);
 740         return (s);
 741 }
 742
 743 /*
 744  * Determine the number of slots necessary for Win95 names
 745  */
 746 int
 747 winSlotCnt(const u_char *un, size_t unlen, struct msdosfsmount *pmp)
 748 {
 749         size_t wlen;
 750         char wn[WIN_MAXLEN * 2 + 1], *wnp;
 751
 752         unlen = winLenFixup(un, unlen);
 753
 754         if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdosfs_iconv) {
 755                 wlen = WIN_MAXLEN * 2;
 756                 wnp = wn;
 757                 msdosfs_iconv->conv(pmp->pm_u2w, (const char **)&un, &unlen,
 758                                     &wnp, &wlen);
 759                 if (unlen > 0)
 760                         return 0;
 761                 return howmany(WIN_MAXLEN - wlen/2, WIN_CHARS);
 762         }
 763
 764         if (unlen > WIN_MAXLEN)
 765                 return 0;
 766         return howmany(unlen, WIN_CHARS);
 767 }
 768
 769 /*
 770  * Determine the number of bytes necessary for Win95 names
 771  */
 772 size_t
 773 winLenFixup(const u_char *un, size_t unlen)
 774 {
 775         for (un += unlen; unlen > 0; unlen--)
 776                 if (*--un != ' ' && *un != '.')
 777                         break;
 778         return unlen;
 779 }
 780
 781 /*
 782  * Store an area with multi byte string instr, and returns left
 783  * byte of instr and moves pointer forward. The area's size is
 784  * inlen or outlen.
 785  */
 786 static int
 787 mbsadjpos(const char **instr, size_t inlen, size_t outlen, int weight, int flag,
 788     void *handle)
 789 {
 790         char *outp, outstr[outlen * weight + 1];
 791
 792         if (flag & MSDOSFSMNT_KICONV && msdosfs_iconv) {
 793                 outp = outstr;
 794                 outlen *= weight;
 795                 msdosfs_iconv->conv(handle, instr, &inlen, &outp, &outlen);
 796                 return (inlen);
 797         }
 798
 799         (*instr) += min(inlen, outlen);
 800         return (inlen - min(inlen, outlen));
 801 }
 802
 803 /*
 804  * Convert DOS char to Local char
 805  */
 806 static uint16_t
 807 dos2unixchr(u_char *outbuf, const u_char **instr, size_t *ilen, int lower,
 808     struct msdosfsmount *pmp)
 809 {
 810         u_char c;
 811         char *outp;
 812         uint16_t wc;
 813         size_t len, olen;
 814
 815         if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdosfs_iconv) {
 816                 olen = len = 2;
 817                 outp = outbuf;
 818
 819                 if (lower & (LCASE_BASE | LCASE_EXT))
 820                         msdosfs_iconv->convchr_case(pmp->pm_d2u,
 821                                                     (const char **)instr, ilen,
 822                                                     &outp, &olen, KICONV_LOWER);
 823                 else
 824                         msdosfs_iconv->convchr(pmp->pm_d2u,
 825                                                (const char **)instr,
 826                                                ilen, &outp, &olen);
 827                 len -= olen;
 828
 829                 /*
 830                  * return '?' if failed to convert
 831                  */
 832                 if (len == 0) {
 833                         (*ilen)--;
 834                         (*instr)++;
 835                         return ('?');
 836                 }
 837                 wc = 0;
 838                 while(len--)
 839                         wc |= (*(outp - len - 1) & 0xff) << (len << 3);
 840                 return (wc);
 841         }
 842         (*ilen)--;
 843         c = *(*instr)++;
 844         c = dos2unix[c];
 845         if (lower & (LCASE_BASE | LCASE_EXT))
 846                 c = u2l[c];
 847         return ((uint16_t)c);
 848 }
 849
 850 /*
 851  * Convert Local char to DOS char
 852  */
 853 static uint16_t
 854 unix2doschr(const u_char **instr, size_t *ilen, struct msdosfsmount *pmp)
 855 {
 856         u_char c;
 857         char *up, *outp, unicode[3], outbuf[3];
 858         uint16_t wc;
 859         size_t len, ucslen, unixlen, olen;
 860
 861         if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdosfs_iconv) {
 862                 /*
 863                  * to hide an invisible character, using a unicode filter
 864                  */
 865                 ucslen = 2;
 866                 len = *ilen;
 867                 up = unicode;
 868                 msdosfs_iconv->convchr(pmp->pm_u2w, (const char **)instr,
 869                                        ilen, &up, &ucslen);
 870                 unixlen = len - *ilen;
 871
 872                 /*
 873                  * cannot be converted
 874                  */
 875                 if (unixlen == 0) {
 876                         (*ilen)--;
 877                         (*instr)++;
 878                         return (0);
 879                 }
 880
 881                 /*
 882                  * return magic number for ascii char
 883                  */
 884                 if (unixlen == 1) {
 885                         c = *(*instr -1);
 886                         if (! (c & 0x80)) {
 887                                 c = unix2dos[c];
 888                                 if (c <= 2)
 889                                         return (c);
 890                         }
 891                 }
 892
 893                 /*
 894                  * now convert using libiconv
 895                  */
 896                 *instr -= unixlen;
 897                 *ilen = len;
 898
 899                 olen = len = 2;
 900                 outp = outbuf;
 901                 msdosfs_iconv->convchr_case(pmp->pm_u2d, (const char **)instr,
 902                                             ilen, &outp, &olen,
 903                                             KICONV_FROM_UPPER);
 904                 len -= olen;
 905
 906                 /*
 907                  * cannot be converted, but has unicode char, should return magic number
 908                  */
 909                 if (len == 0) {
 910                         (*ilen) -= unixlen;
 911                         (*instr) += unixlen;
 912                         return (1);
 913                 }
 914
 915                 wc = 0;
 916                 while(len--)
 917                         wc |= (*(outp - len - 1) & 0xff) << (len << 3);
 918                 return (wc);
 919         }
 920
 921         (*ilen)--;
 922         c = *(*instr)++;
 923         c = l2u[c];
 924         c = unix2dos[c];
 925         return ((uint16_t)c);
 926 }
 927
 928 /*
 929  * Convert Windows char to Local char
 930  */
 931 static uint16_t
 932 win2unixchr(u_char *outbuf, uint16_t wc, struct msdosfsmount *pmp)
 933 {
 934         u_char *inp, *outp, inbuf[3];
 935         size_t ilen, olen, len;
 936
 937         if (wc == 0)
 938                 return (0);
 939         if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdosfs_iconv) {
 940                 inbuf[0] = (u_char)(wc>>8);
 941                 inbuf[1] = (u_char)wc;
 942                 inbuf[2] = '\0';
 943                 ilen = olen = len = 2;
 944                 inp = inbuf;
 945                 outp = outbuf;
 946                 msdosfs_iconv->convchr(pmp->pm_w2u, __DECONST(const char **,
 947                     &inp), &ilen, (char **)&outp, &olen);
 948                 len -= olen;
 949
 950                 /*
 951                  * return '?' if failed to convert
 952                  */
 953                 if (len == 0) {
 954                         wc = '?';
 955                         return (wc);
 956                 }
 957                 wc = 0;
 958                 while(len--)
 959                         wc |= (*(outp - len - 1) & 0xff) << (len << 3);
 960                 return (wc);
 961         }
 962         if (wc & 0xff00)
 963                 wc = '?';
 964         return (wc);
 965 }
 966
 967 /*
 968  * Convert Local char to Windows char
 969  */
 970 static uint16_t
 971 unix2winchr(const u_char **instr, size_t *ilen, int lower,
 972     struct msdosfsmount *pmp)
 973 {
 974         u_char *outp, outbuf[3];
 975         uint16_t wc;
 976         size_t olen;
 977
 978         if (*ilen == 0)
 979                 return (0);
 980
 981         if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdosfs_iconv) {
 982                 outp = outbuf;
 983                 olen = 2;
 984                 if (lower & (LCASE_BASE | LCASE_EXT))
 985                         msdosfs_iconv->convchr_case(pmp->pm_u2w,
 986                                                     (const char **)instr,
 987                                                     ilen, (char **)&outp, &olen,
 988                                                     KICONV_FROM_LOWER);
 989                 else
 990                         msdosfs_iconv->convchr(pmp->pm_u2w,
 991                                                (const char **)instr,
 992                                                ilen, (char **)&outp, &olen);
 993                 /*
 994                  * return '0' if end of filename
 995                  */
 996                 if (olen == 2)
 997                         return (0);
 998
 999                 wc = (outbuf[0]<<8) | outbuf[1];
1000                 return (wc);
1001         }
1002
1003         (*ilen)--;
1004         wc = (*instr)[0];
1005         if (lower & (LCASE_BASE | LCASE_EXT))
1006                 wc = u2l[wc];
1007         (*instr)++;
1008         return (wc);
1009 }
1010
1011 /*
1012  * Initialize the temporary concatenation buffer.
1013  */
1014 void
1015 mbnambuf_init(struct mbnambuf *nbp)
1016 {
1017         nbp->nb_len = 0;
1018         nbp->nb_last_id = -1;
1019         nbp->nb_buf[sizeof(nbp->nb_buf) - 1] = '\0';
1020 }
1021
1022 /*
1023  * Fill out our concatenation buffer with the given substring, at the offset
1024  * specified by its id.  Since this function must be called with ids in
1025  * descending order, we take advantage of the fact that ASCII substrings are
1026  * exactly WIN_CHARS in length.  For non-ASCII substrings, we shift all
1027  * previous (i.e. higher id) substrings upwards to make room for this one.
1028  * This only penalizes portions of substrings that contain more than
1029  * WIN_CHARS bytes when they are first encountered.
1030  */
1031 int
1032 mbnambuf_write(struct mbnambuf *nbp, char *name, int id)
1033 {
1034         char *slot;
1035         size_t count, newlen;
1036
1037         if (nbp->nb_len != 0 && id != nbp->nb_last_id - 1) {
1038                 kprintf("msdosfs: non-decreasing id: id %d, last id %d\n",
1039                     id, nbp->nb_last_id);
1040                 return (EINVAL);
1041         }
1042
1043         /* Will store this substring in a WIN_CHARS-aligned slot. */
1044         slot = &nbp->nb_buf[id * WIN_CHARS];
1045         count = strlen(name);
1046         newlen = nbp->nb_len + count;
1047         if (newlen > WIN_MAXLEN || newlen > 127) {
1048                 kprintf("msdosfs: file name length %zu too large\n", newlen);
1049                 return (ENAMETOOLONG);
1050         }
1051
1052         /* Shift suffix upwards by the amount length exceeds WIN_CHARS. */
1053         if (count > WIN_CHARS && nbp->nb_len != 0) {
1054                 if ((id * WIN_CHARS + count + nbp->nb_len) >
1055                     sizeof(nbp->nb_buf))
1056                         return (ENAMETOOLONG);
1057
1058                 memmove(slot + count, slot + WIN_CHARS, nbp->nb_len);
1059         }
1060
1061         /* Copy in the substring to its slot and update length so far. */
1062         memcpy(slot, name, count);
1063         nbp->nb_len = newlen;
1064         nbp->nb_last_id = id;
1065
1066         return (0);
1067 }
1068
1069 /*
1070  * Take the completed string and use it to setup the struct dirent.
1071  * Be sure to always nul-terminate the d_name and then copy the string
1072  * from our buffer.  Note that this function assumes the full string has
1073  * been reassembled in the buffer.  If it's called before all substrings
1074  * have been written via mbnambuf_write(), the result will be incorrect.
1075  */
1076 char *
1077 mbnambuf_flush(struct mbnambuf *nbp, struct dirent *dp)
1078 {
1079         if (nbp->nb_len > sizeof(dp->d_name) - 1) {
1080                 mbnambuf_init(nbp);
1081                 return (NULL);
1082         }
1083         memcpy(dp->d_name, &nbp->nb_buf[0], nbp->nb_len);
1084         dp->d_name[nbp->nb_len] = '\0';
1085         dp->d_namlen = nbp->nb_len;
1086
1087         mbnambuf_init(nbp);
1088         return (dp->d_name);
1089 }