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  * Copyright (C) 1995, 1997 Wolfgang Solfrank.
    6  * Copyright (C) 1995, 1997 TooLs GmbH.
    7  * All rights reserved.
    8  * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below).
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. All advertising materials mentioning features or use of this software
   19  *    must display the following acknowledgement:
   20  *      This product includes software developed by TooLs GmbH.
   21  * 4. The name of TooLs GmbH may not be used to endorse or promote products
   22  *    derived from this software without specific prior written permission.
   23  *
   24  * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
   25  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   26  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   27  * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   28  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   29  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
   30  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
   31  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
   32  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
   33  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   34  */
   35 /*-
   36  * Written by Paul Popelka (paulp@uts.amdahl.com)
   37  *
   38  * You can do anything you want with this software, just don't say you wrote
   39  * it, and don't remove this notice.
   40  *
   41  * This software is provided "as is".
   42  *
   43  * The author supplies this software to be publicly redistributed on the
   44  * understanding that the author is not responsible for the correct
   45  * functioning of this software in any circumstances and is not liable for
   46  * any damages caused by this software.
   47  *
   48  * October 1992
   49  */
   50 
   51 #include <sys/param.h>
   52 #include <sys/systm.h>
   53 #include <sys/dirent.h>
   54 #include <sys/iconv.h>
   55 #include <sys/mount.h>
   56 
   57 #include <fs/msdosfs/bpb.h>
   58 #include <fs/msdosfs/direntry.h>
   59 #include <fs/msdosfs/msdosfsmount.h>
   60 
   61 extern struct iconv_functions *msdosfs_iconv;
   62 
   63 static int mbsadjpos(const char **, size_t, size_t, int, int, void *handle);
   64 static u_char * dos2unixchr(u_char *, const u_char **, size_t *, int, struct msdosfsmount *);
   65 static u_int16_t unix2doschr(const u_char **, size_t *, struct msdosfsmount *);
   66 static u_char * win2unixchr(u_char *, u_int16_t, struct msdosfsmount *);
   67 static u_int16_t unix2winchr(const u_char **, size_t *, int, struct msdosfsmount *);
   68 
   69 /*
   70  * 0 - character disallowed in long file name.
   71  * 1 - character should be replaced by '_' in DOS file name, 
   72  *     and generation number inserted.
   73  * 2 - character ('.' and ' ') should be skipped in DOS file name,
   74  *     and generation number inserted.
   75  */
   76 static u_char
   77 unix2dos[256] = {
   78 /* iso8859-1 -> cp850 */
   79         0,    0,    0,    0,    0,    0,    0,    0,    /* 00-07 */
   80         0,    0,    0,    0,    0,    0,    0,    0,    /* 08-0f */
   81         0,    0,    0,    0,    0,    0,    0,    0,    /* 10-17 */
   82         0,    0,    0,    0,    0,    0,    0,    0,    /* 18-1f */
   83         2,    0x21, 0,    0x23, 0x24, 0x25, 0x26, 0x27, /* 20-27 */
   84         0x28, 0x29, 0,    1,    1,    0x2d, 2,    0,    /* 28-2f */
   85         0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 30-37 */
   86         0x38, 0x39, 0,    1,    0,    1,    0,    0,    /* 38-3f */
   87         0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 40-47 */
   88         0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 48-4f */
   89         0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 50-57 */
   90         0x58, 0x59, 0x5a, 1,    0,    1,    0x5e, 0x5f, /* 58-5f */
   91         0x60, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 60-67 */
   92         0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 68-6f */
   93         0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 70-77 */
   94         0x58, 0x59, 0x5a, 0x7b, 0,    0x7d, 0x7e, 0,    /* 78-7f */
   95         0,    0,    0,    0,    0,    0,    0,    0,    /* 80-87 */
   96         0,    0,    0,    0,    0,    0,    0,    0,    /* 88-8f */
   97         0,    0,    0,    0,    0,    0,    0,    0,    /* 90-97 */
   98         0,    0,    0,    0,    0,    0,    0,    0,    /* 98-9f */
   99         0,    0xad, 0xbd, 0x9c, 0xcf, 0xbe, 0xdd, 0xf5, /* a0-a7 */
  100         0xf9, 0xb8, 0xa6, 0xae, 0xaa, 0xf0, 0xa9, 0xee, /* a8-af */
  101         0xf8, 0xf1, 0xfd, 0xfc, 0xef, 0xe6, 0xf4, 0xfa, /* b0-b7 */
  102         0xf7, 0xfb, 0xa7, 0xaf, 0xac, 0xab, 0xf3, 0xa8, /* b8-bf */
  103         0xb7, 0xb5, 0xb6, 0xc7, 0x8e, 0x8f, 0x92, 0x80, /* c0-c7 */
  104         0xd4, 0x90, 0xd2, 0xd3, 0xde, 0xd6, 0xd7, 0xd8, /* c8-cf */
  105         0xd1, 0xa5, 0xe3, 0xe0, 0xe2, 0xe5, 0x99, 0x9e, /* d0-d7 */
  106         0x9d, 0xeb, 0xe9, 0xea, 0x9a, 0xed, 0xe8, 0xe1, /* d8-df */
  107         0xb7, 0xb5, 0xb6, 0xc7, 0x8e, 0x8f, 0x92, 0x80, /* e0-e7 */
  108         0xd4, 0x90, 0xd2, 0xd3, 0xde, 0xd6, 0xd7, 0xd8, /* e8-ef */
  109         0xd1, 0xa5, 0xe3, 0xe0, 0xe2, 0xe5, 0x99, 0xf6, /* f0-f7 */
  110         0x9d, 0xeb, 0xe9, 0xea, 0x9a, 0xed, 0xe8, 0x98, /* f8-ff */
  111 };
  112 
  113 static u_char
  114 dos2unix[256] = {
  115 /* cp850 -> iso8859-1 */
  116         0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, /* 00-07 */
  117         0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, /* 08-0f */
  118         0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, /* 10-17 */
  119         0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, /* 18-1f */
  120         0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 20-27 */
  121         0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 28-2f */
  122         0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 30-37 */
  123         0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 38-3f */
  124         0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 40-47 */
  125         0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 48-4f */
  126         0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 50-57 */
  127         0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 58-5f */
  128         0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 60-67 */
  129         0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 68-6f */
  130         0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 70-77 */
  131         0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 78-7f */
  132         0xc7, 0xfc, 0xe9, 0xe2, 0xe4, 0xe0, 0xe5, 0xe7, /* 80-87 */
  133         0xea, 0xeb, 0xe8, 0xef, 0xee, 0xec, 0xc4, 0xc5, /* 88-8f */
  134         0xc9, 0xe6, 0xc6, 0xf4, 0xf6, 0xf2, 0xfb, 0xf9, /* 90-97 */
  135         0xff, 0xd6, 0xdc, 0xf8, 0xa3, 0xd8, 0xd7, 0x3f, /* 98-9f */
  136         0xe1, 0xed, 0xf3, 0xfa, 0xf1, 0xd1, 0xaa, 0xba, /* a0-a7 */
  137         0xbf, 0xae, 0xac, 0xbd, 0xbc, 0xa1, 0xab, 0xbb, /* a8-af */
  138         0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0xc1, 0xc2, 0xc0, /* b0-b7 */
  139         0xa9, 0x3f, 0x3f, 0x3f, 0x3f, 0xa2, 0xa5, 0x3f, /* b8-bf */
  140         0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0xe3, 0xc3, /* c0-c7 */
  141         0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0xa4, /* c8-cf */
  142         0xf0, 0xd0, 0xca, 0xcb, 0xc8, 0x3f, 0xcd, 0xce, /* d0-d7 */
  143         0xcf, 0x3f, 0x3f, 0x3f, 0x3f, 0xa6, 0xcc, 0x3f, /* d8-df */
  144         0xd3, 0xdf, 0xd4, 0xd2, 0xf5, 0xd5, 0xb5, 0xfe, /* e0-e7 */
  145         0xde, 0xda, 0xdb, 0xd9, 0xfd, 0xdd, 0xaf, 0x3f, /* e8-ef */
  146         0xad, 0xb1, 0x3f, 0xbe, 0xb6, 0xa7, 0xf7, 0xb8, /* f0-f7 */
  147         0xb0, 0xa8, 0xb7, 0xb9, 0xb3, 0xb2, 0x3f, 0x3f, /* f8-ff */
  148 };
  149 
  150 static u_char
  151 u2l[256] = {
  152 /* tolower */
  153         0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 00-07 */
  154         0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 08-0f */
  155         0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 10-17 */
  156         0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /* 18-1f */
  157         0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 20-27 */
  158         0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 28-2f */
  159         0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 30-37 */
  160         0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 38-3f */
  161         0x40, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 40-47 */
  162         0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 48-4f */
  163         0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 50-57 */
  164         0x78, 0x79, 0x7a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 58-5f */
  165         0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 60-67 */
  166         0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 68-6f */
  167         0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 70-77 */
  168         0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 78-7f */
  169         0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, /* 80-87 */
  170         0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, /* 88-8f */
  171         0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, /* 90-97 */
  172         0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, /* 98-9f */
  173         0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, /* a0-a7 */
  174         0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, /* a8-af */
  175         0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, /* b0-b7 */
  176         0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, /* b8-bf */
  177         0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* c0-c7 */
  178         0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* c8-cf */
  179         0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xd7, /* d0-d7 */
  180         0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xdf, /* d8-df */
  181         0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* e0-e7 */
  182         0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* e8-ef */
  183         0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, /* f0-f7 */
  184         0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, /* f8-ff */
  185 };
  186 
  187 static u_char
  188 l2u[256] = {
  189 /* toupper */
  190         0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 00-07 */
  191         0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 08-0f */
  192         0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 10-17 */
  193         0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /* 18-1f */
  194         0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 20-27 */
  195         0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 28-2f */
  196         0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 30-37 */
  197         0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 38-3f */
  198         0x40, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 40-47 */
  199         0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 48-4f */
  200         0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 50-57 */
  201         0x78, 0x79, 0x7a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 58-5f */
  202         0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 60-67 */
  203         0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 68-6f */
  204         0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 70-77 */
  205         0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 78-7f */
  206         0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, /* 80-87 */
  207         0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, /* 88-8f */
  208         0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, /* 90-97 */
  209         0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, /* 98-9f */
  210         0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, /* a0-a7 */
  211         0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, /* a8-af */
  212         0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, /* b0-b7 */
  213         0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, /* b8-bf */
  214         0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* c0-c7 */
  215         0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* c8-cf */
  216         0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xd7, /* d0-d7 */
  217         0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xdf, /* d8-df */
  218         0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* e0-e7 */
  219         0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* e8-ef */
  220         0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, /* f0-f7 */
  221         0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, /* f8-ff */
  222 };
  223 
  224 /*
  225  * DOS filenames are made of 2 parts, the name part and the extension part.
  226  * The name part is 8 characters long and the extension part is 3
  227  * characters long.  They may contain trailing blanks if the name or
  228  * extension are not long enough to fill their respective fields.
  229  */
  230 
  231 /*
  232  * Convert a DOS filename to a unix filename. And, return the number of
  233  * characters in the resulting unix filename excluding the terminating
  234  * null.
  235  */
  236 int
  237 dos2unixfn(u_char dn[11], u_char *un, int lower, struct msdosfsmount *pmp)
  238 {
  239         size_t i;
  240         int thislong = 0;
  241         u_char *c, tmpbuf[5];
  242 
  243         /*
  244          * If first char of the filename is SLOT_E5 (0x05), then the real
  245          * first char of the filename should be 0xe5. But, they couldn't
  246          * just have a 0xe5 mean 0xe5 because that is used to mean a freed
  247          * directory slot. Another dos quirk.
  248          */
  249         if (*dn == SLOT_E5)
  250                 *dn = 0xe5;
  251 
  252         /*
  253          * Copy the name portion into the unix filename string.
  254          */
  255         for (i = 8; i > 0 && *dn != ' ';) {
  256                 c = dos2unixchr(tmpbuf, __DECONST(const u_char **, &dn), &i,
  257                     lower & LCASE_BASE, pmp);
  258                 while (*c != '\0') {
  259                         *un++ = *c++;
  260                         thislong++;
  261                 }
  262         }
  263         dn += i;
  264 
  265         /*
  266          * Now, if there is an extension then put in a period and copy in
  267          * the extension.
  268          */
  269         if (*dn != ' ') {
  270                 *un++ = '.';
  271                 thislong++;
  272                 for (i = 3; i > 0 && *dn != ' ';) {
  273                         c = dos2unixchr(tmpbuf, __DECONST(const u_char **, &dn),
  274                             &i, lower & LCASE_EXT, pmp);
  275                         while (*c != '\0') {
  276                                 *un++ = *c++;
  277                                 thislong++;
  278                         }
  279                 }
  280         }
  281         *un++ = 0;
  282 
  283         return (thislong);
  284 }
  285 
  286 /*
  287  * Convert a unix filename to a DOS filename according to Win95 rules.
  288  * If applicable and gen is not 0, it is inserted into the converted
  289  * filename as a generation number.
  290  * Returns
  291  *      0 if name couldn't be converted
  292  *      1 if the converted name is the same as the original
  293  *        (no long filename entry necessary for Win95)
  294  *      2 if conversion was successful
  295  *      3 if conversion was successful and generation number was inserted
  296  */
  297 int
  298 unix2dosfn(const u_char *un, u_char dn[12], size_t unlen, u_int gen,
  299     struct msdosfsmount *pmp)
  300 {
  301         ssize_t i, j;
  302         int l;
  303         int conv = 1;
  304         const u_char *cp, *dp, *dp1;
  305         u_char gentext[6], *wcp;
  306         u_int16_t c;
  307 
  308         /*
  309          * Fill the dos filename string with blanks. These are DOS's pad
  310          * characters.
  311          */
  312         for (i = 0; i < 11; i++)
  313                 dn[i] = ' ';
  314         dn[11] = 0;
  315 
  316         /*
  317          * The filenames "." and ".." are handled specially, since they
  318          * don't follow dos filename rules.
  319          */
  320         if (un[0] == '.' && unlen == 1) {
  321                 dn[0] = '.';
  322                 return gen <= 1;
  323         }
  324         if (un[0] == '.' && un[1] == '.' && unlen == 2) {
  325                 dn[0] = '.';
  326                 dn[1] = '.';
  327                 return gen <= 1;
  328         }
  329 
  330         /*
  331          * Filenames with only blanks and dots are not allowed!
  332          */
  333         for (cp = un, i = unlen; --i >= 0; cp++)
  334                 if (*cp != ' ' && *cp != '.')
  335                         break;
  336         if (i < 0)
  337                 return 0;
  338 
  339 
  340         /*
  341          * Filenames with some characters are not allowed!
  342          */
  343         for (cp = un, i = unlen; i > 0;)
  344                 if (unix2doschr(&cp, (size_t *)&i, pmp) == 0)
  345                         return 0;
  346 
  347         /*
  348          * Now find the extension
  349          * Note: dot as first char doesn't start extension
  350          *       and trailing dots and blanks are ignored
  351          * Note(2003/7): It seems recent Windows has
  352          *       defferent rule than this code, that Windows
  353          *       ignores all dots before extension, and use all
  354          *       chars as filename except for dots.
  355          */
  356         dp = dp1 = NULL;
  357         for (cp = un + 1, i = unlen - 1; --i >= 0;) {
  358                 switch (*cp++) {
  359                 case '.':
  360                         if (!dp1)
  361                                 dp1 = cp;
  362                         break;
  363                 case ' ':
  364                         break;
  365                 default:
  366                         if (dp1)
  367                                 dp = dp1;
  368                         dp1 = NULL;
  369                         break;
  370                 }
  371         }
  372 
  373         /*
  374          * Now convert it (this part is for extension).
  375          * As Windows XP do, if it's not ascii char,
  376          * this function should return 2 or 3, so that checkng out Unicode name.
  377          */
  378         if (dp) {
  379                 if (dp1)
  380                         l = dp1 - dp;
  381                 else
  382                         l = unlen - (dp - un);
  383                 for (cp = dp, i = l, j = 8; i > 0 && j < 11; j++) {
  384                         c = unix2doschr(&cp, (size_t *)&i, pmp);
  385                         if (c & 0xff00) {
  386                                 dn[j] = c >> 8;
  387                                 if (++j < 11) {
  388                                         dn[j] = c;
  389                                         if (conv != 3)
  390                                                 conv = 2;
  391                                         continue;
  392                                 } else {
  393                                         conv = 3;
  394                                         dn[j-1] = ' ';
  395                                         break;
  396                                 }
  397                         } else {
  398                                 dn[j] = c;
  399                         }
  400                         if (((dn[j] & 0x80) || *(cp - 1) != dn[j]) && conv != 3)
  401                                 conv = 2;
  402                         if (dn[j] == 1) {
  403                                 conv = 3;
  404                                 dn[j] = '_';
  405                         }
  406                         if (dn[j] == 2) {
  407                                 conv = 3;
  408                                 dn[j--] = ' ';
  409                         }
  410                 }
  411                 if (i > 0)
  412                         conv = 3;
  413                 dp--;
  414         } else {
  415                 for (dp = cp; *--dp == ' ' || *dp == '.';);
  416                 dp++;
  417         }
  418 
  419         /*
  420          * Now convert the rest of the name
  421          */
  422         for (i = dp - un, j = 0; un < dp && j < 8; j++) {
  423                 c = unix2doschr(&un, &i, pmp);
  424                 if (c & 0xff00) {
  425                         dn[j] = c >> 8;
  426                         if (++j < 8) {
  427                                 dn[j] = c;
  428                                 if (conv != 3)
  429                                         conv = 2;
  430                                 continue;
  431                         } else {
  432                                 conv = 3;
  433                                 dn[j-1] = ' ';
  434                                 break;
  435                         }
  436                 } else {
  437                         dn[j] = c;
  438                 }
  439                 if (((dn[j] & 0x80) || *(un - 1) != dn[j]) && conv != 3)
  440                         conv = 2;
  441                 if (dn[j] == 1) {
  442                         conv = 3;
  443                         dn[j] = '_';
  444                 }
  445                 if (dn[j] == 2) {
  446                         conv = 3;
  447                         dn[j--] = ' ';
  448                 }
  449         }
  450         if (un < dp)
  451                 conv = 3;
  452         /*
  453          * If we didn't have any chars in filename,
  454          * generate a default
  455          */
  456         if (!j)
  457                 dn[0] = '_';
  458 
  459         /*
  460          * If there wasn't any char dropped,
  461          * there is no place for generation numbers
  462          */
  463         if (conv != 3) {
  464                 if (gen > 1)
  465                         conv = 0;
  466                 goto done;
  467         }
  468 
  469         /*
  470          * Now insert the generation number into the filename part
  471          */
  472         if (gen == 0)
  473                 goto done;
  474         for (wcp = gentext + sizeof(gentext); wcp > gentext && gen; gen /= 10)
  475                 *--wcp = gen % 10 + '';
  476         if (gen) {
  477                 conv = 0;
  478                 goto done;
  479         }
  480         for (i = 8; dn[--i] == ' ';);
  481         i++;
  482         if (gentext + sizeof(gentext) - wcp + 1 > 8 - i)
  483                 i = 8 - (gentext + sizeof(gentext) - wcp + 1);
  484         /*
  485          * Correct posision to where insert the generation number
  486          */
  487         cp = dn;
  488         i -= mbsadjpos((const char**)&cp, i, unlen, 1, pmp->pm_flags, pmp->pm_d2u);
  489 
  490         dn[i++] = '~';
  491         while (wcp < gentext + sizeof(gentext))
  492                 dn[i++] = *wcp++;
  493 
  494         /*
  495          * Tail of the filename should be space
  496          */
  497         while (i < 8)
  498                 dn[i++] = ' ';
  499         conv = 3;
  500 
  501 done:
  502         /*
  503          * The first character cannot be E5,
  504          * because that means a deleted entry
  505          */
  506         if (dn[0] == 0xe5)
  507                 dn[0] = SLOT_E5;
  508 
  509         return conv;
  510 }
  511 
  512 /*
  513  * Create a Win95 long name directory entry
  514  * Note: assumes that the filename is valid,
  515  *       i.e. doesn't consist solely of blanks and dots
  516  */
  517 int
  518 unix2winfn(const u_char *un, size_t unlen, struct winentry *wep, int cnt,
  519     int chksum, struct msdosfsmount *pmp)
  520 {
  521         u_int8_t *wcp;
  522         int i, end;
  523         u_int16_t code;
  524 
  525         /*
  526          * Drop trailing blanks and dots
  527          */
  528         unlen = winLenFixup(un, unlen);
  529 
  530         /*
  531          * Cut *un for this slot
  532          */
  533         unlen = mbsadjpos((const char **)&un, unlen, (cnt - 1) * WIN_CHARS, 2,
  534                           pmp->pm_flags, pmp->pm_u2w);
  535 
  536         /*
  537          * Initialize winentry to some useful default
  538          */
  539         for (wcp = (u_int8_t *)wep, i = sizeof(*wep); --i >= 0; *wcp++ = 0xff);
  540         wep->weCnt = cnt;
  541         wep->weAttributes = ATTR_WIN95;
  542         wep->weReserved1 = 0;
  543         wep->weChksum = chksum;
  544         wep->weReserved2 = 0;
  545 
  546         /*
  547          * Now convert the filename parts
  548          */
  549         end = 0;
  550         for (wcp = wep->wePart1, i = sizeof(wep->wePart1)/2; --i >= 0 && !end;) {
  551                 code = unix2winchr(&un, &unlen, 0, pmp);
  552                 *wcp++ = code;
  553                 *wcp++ = code >> 8;
  554                 if (!code)
  555                         end = WIN_LAST;
  556         }
  557         for (wcp = wep->wePart2, i = sizeof(wep->wePart2)/2; --i >= 0 && !end;) {
  558                 code = unix2winchr(&un, &unlen, 0, pmp);
  559                 *wcp++ = code;
  560                 *wcp++ = code >> 8;
  561                 if (!code)
  562                         end = WIN_LAST;
  563         }
  564         for (wcp = wep->wePart3, i = sizeof(wep->wePart3)/2; --i >= 0 && !end;) {
  565                 code = unix2winchr(&un, &unlen, 0, pmp);
  566                 *wcp++ = code;
  567                 *wcp++ = code >> 8;
  568                 if (!code)
  569                         end = WIN_LAST;
  570         }
  571         if (!unlen)
  572                 end = WIN_LAST;
  573         wep->weCnt |= end;
  574         return !end;
  575 }
  576 
  577 /*
  578  * Compare our filename to the one in the Win95 entry
  579  * Returns the checksum or -1 if no match
  580  */
  581 int
  582 winChkName(struct mbnambuf *nbp, const u_char *un, size_t unlen, int chksum,
  583     struct msdosfsmount *pmp)
  584 {
  585         size_t len;
  586         u_int16_t c1, c2;
  587         u_char *np;
  588         struct dirent dirbuf;
  589 
  590         /*
  591          * We already have winentry in *nbp.
  592          */
  593         if (!mbnambuf_flush(nbp, &dirbuf) || dirbuf.d_namlen == 0)
  594                 return -1;
  595 
  596 #ifdef MSDOSFS_DEBUG
  597         printf("winChkName(): un=%s:%d,d_name=%s:%d\n", un, unlen,
  598                                                         dirbuf.d_name,
  599                                                         dirbuf.d_namlen);
  600 #endif
  601 
  602         /*
  603          * Compare the name parts
  604          */
  605         len = dirbuf.d_namlen;
  606         if (unlen != len)
  607                 return -2;
  608 
  609         for (np = dirbuf.d_name; unlen > 0 && len > 0;) {
  610                 /*
  611                  * Comparison must be case insensitive, because FAT disallows
  612                  * to look up or create files in case sensitive even when
  613                  * it's a long file name.
  614                  */
  615                 c1 = unix2winchr(__DECONST(const u_char **, &np), &len,
  616                     LCASE_BASE, pmp);
  617                 c2 = unix2winchr(&un, &unlen, LCASE_BASE, pmp);
  618                 if (c1 != c2)
  619                         return -2;
  620         }
  621         return chksum;
  622 }
  623 
  624 /*
  625  * Convert Win95 filename to dirbuf.
  626  * Returns the checksum or -1 if impossible
  627  */
  628 int
  629 win2unixfn(struct mbnambuf *nbp, struct winentry *wep, int chksum,
  630     struct msdosfsmount *pmp)
  631 {
  632         u_char *c, tmpbuf[5];
  633         u_int8_t *cp;
  634         u_int8_t *np, name[WIN_CHARS * 3 + 1];
  635         u_int16_t code;
  636         int i;
  637 
  638         if ((wep->weCnt&WIN_CNT) > howmany(WIN_MAXLEN, WIN_CHARS)
  639             || !(wep->weCnt&WIN_CNT))
  640                 return -1;
  641 
  642         /*
  643          * First compare checksums
  644          */
  645         if (wep->weCnt&WIN_LAST) {
  646                 chksum = wep->weChksum;
  647         } else if (chksum != wep->weChksum)
  648                 chksum = -1;
  649         if (chksum == -1)
  650                 return -1;
  651 
  652         /*
  653          * Convert the name parts
  654          */
  655         np = name;
  656         for (cp = wep->wePart1, i = sizeof(wep->wePart1)/2; --i >= 0;) {
  657                 code = (cp[1] << 8) | cp[0];
  658                 switch (code) {
  659                 case 0:
  660                         *np = '\0';
  661                         if (mbnambuf_write(nbp, name,
  662                             (wep->weCnt & WIN_CNT) - 1) != 0)
  663                                 return -1;
  664                         return chksum;
  665                 case '/':
  666                         *np = '\0';
  667                         return -1;
  668                 default:
  669                         c = win2unixchr(tmpbuf, code, pmp);
  670                         while (*c != '\0')
  671                                 *np++ = *c++;
  672                         break;
  673                 }
  674                 cp += 2;
  675         }
  676         for (cp = wep->wePart2, i = sizeof(wep->wePart2)/2; --i >= 0;) {
  677                 code = (cp[1] << 8) | cp[0];
  678                 switch (code) {
  679                 case 0:
  680                         *np = '\0';
  681                         if (mbnambuf_write(nbp, name,
  682                             (wep->weCnt & WIN_CNT) - 1) != 0)
  683                                 return -1;
  684                         return chksum;
  685                 case '/':
  686                         *np = '\0';
  687                         return -1;
  688                 default:
  689                         c = win2unixchr(tmpbuf, code, pmp);
  690                         while (*c != '\0')
  691                                 *np++ = *c++;
  692                         break;
  693                 }
  694                 cp += 2;
  695         }
  696         for (cp = wep->wePart3, i = sizeof(wep->wePart3)/2; --i >= 0;) {
  697                 code = (cp[1] << 8) | cp[0];
  698                 switch (code) {
  699                 case 0:
  700                         *np = '\0';
  701                         if (mbnambuf_write(nbp, name,
  702                             (wep->weCnt & WIN_CNT) - 1) != 0)
  703                                 return -1;
  704                         return chksum;
  705                 case '/':
  706                         *np = '\0';
  707                         return -1;
  708                 default:
  709                         c = win2unixchr(tmpbuf, code, pmp);
  710                         while (*c != '\0')
  711                                 *np++ = *c++;
  712                         break;
  713                 }
  714                 cp += 2;
  715         }
  716         *np = '\0';
  717         if (mbnambuf_write(nbp, name, (wep->weCnt & WIN_CNT) - 1) != 0)
  718                 return -1;
  719         return chksum;
  720 }
  721 
  722 /*
  723  * Compute the unrolled checksum of a DOS filename for Win95 LFN use.
  724  */
  725 u_int8_t
  726 winChksum(u_int8_t *name)
  727 {
  728         int i;
  729         u_int8_t s;
  730 
  731         for (s = 0, i = 11; --i >= 0; s += *name++)
  732                 s = (s << 7)|(s >> 1);
  733         return (s);
  734 }
  735 
  736 /*
  737  * Determine the number of slots necessary for Win95 names
  738  */
  739 int
  740 winSlotCnt(const u_char *un, size_t unlen, struct msdosfsmount *pmp)
  741 {
  742         size_t wlen;
  743         char wn[WIN_MAXLEN * 2 + 1], *wnp;
  744 
  745         unlen = winLenFixup(un, unlen);
  746 
  747         if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdosfs_iconv) {
  748                 wlen = WIN_MAXLEN * 2;
  749                 wnp = wn;
  750                 msdosfs_iconv->conv(pmp->pm_u2w, (const char **)&un, &unlen, &wnp, &wlen);
  751                 if (unlen > 0)
  752                         return 0;
  753                 return howmany(WIN_MAXLEN - wlen/2, WIN_CHARS);
  754         }
  755 
  756         if (unlen > WIN_MAXLEN)
  757                 return 0;
  758         return howmany(unlen, WIN_CHARS);
  759 }
  760 
  761 /*
  762  * Determine the number of bytes necessary for Win95 names
  763  */
  764 size_t
  765 winLenFixup(const u_char *un, size_t unlen)
  766 {
  767         for (un += unlen; unlen > 0; unlen--)
  768                 if (*--un != ' ' && *un != '.')
  769                         break;
  770         return unlen;
  771 }
  772 
  773 /*
  774  * Store an area with multi byte string instr, and returns left
  775  * byte of instr and moves pointer forward. The area's size is
  776  * inlen or outlen.
  777  */
  778 static int
  779 mbsadjpos(const char **instr, size_t inlen, size_t outlen, int weight, int flag, void *handle)
  780 {
  781         char *outp, outstr[outlen * weight + 1];
  782 
  783         if (flag & MSDOSFSMNT_KICONV && msdosfs_iconv) {
  784                 outp = outstr;
  785                 outlen *= weight;
  786                 msdosfs_iconv->conv(handle, instr, &inlen, &outp, &outlen);
  787                 return (inlen);
  788         }
  789 
  790         (*instr) += min(inlen, outlen);
  791         return (inlen - min(inlen, outlen));
  792 }
  793 
  794 /*
  795  * Convert DOS char to Local char
  796  */
  797 static u_char *
  798 dos2unixchr(u_char *outbuf, const u_char **instr, size_t *ilen, int lower, struct msdosfsmount *pmp)
  799 {
  800         u_char c, *outp;
  801         size_t len, olen;
  802 
  803         outp = outbuf;
  804         if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdosfs_iconv) {
  805                 olen = len = 4;
  806 
  807                 if (lower & (LCASE_BASE | LCASE_EXT))
  808                         msdosfs_iconv->convchr_case(pmp->pm_d2u, (const char **)instr,
  809                                                   ilen, (char **)&outp, &olen, KICONV_LOWER);
  810                 else
  811                         msdosfs_iconv->convchr(pmp->pm_d2u, (const char **)instr,
  812                                              ilen, (char **)&outp, &olen);
  813                 len -= olen;
  814 
  815                 /*
  816                  * return '?' if failed to convert
  817                  */
  818                 if (len == 0) {
  819                         (*ilen)--;
  820                         (*instr)++;
  821                         *outp++ = '?';
  822                 }
  823         } else {
  824                 (*ilen)--;
  825                 c = *(*instr)++;
  826                 c = dos2unix[c];
  827                 if (lower & (LCASE_BASE | LCASE_EXT))
  828                         c = u2l[c];
  829                 *outp++ = c;
  830                 outbuf[1] = '\0';
  831         }
  832 
  833         *outp = '\0';
  834         outp = outbuf;
  835         return (outp);
  836 }
  837 
  838 /*
  839  * Convert Local char to DOS char
  840  */
  841 static u_int16_t
  842 unix2doschr(const u_char **instr, size_t *ilen, struct msdosfsmount *pmp)
  843 {
  844         u_char c;
  845         char *up, *outp, unicode[3], outbuf[3];
  846         u_int16_t wc;
  847         size_t len, ucslen, unixlen, olen;
  848 
  849         if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdosfs_iconv) {
  850                 /*
  851                  * to hide an invisible character, using a unicode filter
  852                  */
  853                 ucslen = 2;
  854                 len = *ilen;
  855                 up = unicode;
  856                 msdosfs_iconv->convchr(pmp->pm_u2w, (const char **)instr,
  857                                      ilen, &up, &ucslen);
  858                 unixlen = len - *ilen;
  859 
  860                 /*
  861                  * cannot be converted
  862                  */
  863                 if (unixlen == 0) {
  864                         (*ilen)--;
  865                         (*instr)++;
  866                         return (0);
  867                 }
  868 
  869                 /*
  870                  * return magic number for ascii char
  871                  */
  872                 if (unixlen == 1) {
  873                         c = *(*instr -1);
  874                         if (! (c & 0x80)) {
  875                                 c = unix2dos[c];
  876                                 if (c <= 2)
  877                                         return (c);
  878                         }
  879                 }
  880 
  881                 /*
  882                  * now convert using libiconv
  883                  */
  884                 *instr -= unixlen;
  885                 *ilen = len;
  886 
  887                 olen = len = 2;
  888                 outp = outbuf;
  889                 msdosfs_iconv->convchr_case(pmp->pm_u2d, (const char **)instr,
  890                                           ilen, &outp, &olen, KICONV_FROM_UPPER);
  891                 len -= olen;
  892 
  893                 /*
  894                  * cannot be converted, but has unicode char, should return magic number
  895                  */
  896                 if (len == 0) {
  897                         (*ilen) -= unixlen;
  898                         (*instr) += unixlen;
  899                         return (1);
  900                 }
  901 
  902                 wc = 0;
  903                 while(len--)
  904                         wc |= (*(outp - len - 1) & 0xff) << (len << 3);
  905                 return (wc);
  906         }
  907 
  908         (*ilen)--;
  909         c = *(*instr)++;
  910         c = l2u[c];
  911         c = unix2dos[c];
  912         return ((u_int16_t)c);
  913 }
  914 
  915 /*
  916  * Convert Windows char to Local char
  917  */
  918 static u_char *
  919 win2unixchr(u_char *outbuf, u_int16_t wc, struct msdosfsmount *pmp)
  920 {
  921         u_char *inp, *outp, inbuf[3];
  922         size_t ilen, olen, len;
  923 
  924         outp = outbuf;
  925         if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdosfs_iconv) {
  926                 inbuf[0] = (u_char)(wc>>8);
  927                 inbuf[1] = (u_char)wc;
  928                 inbuf[2] = '\0';
  929 
  930                 ilen = 2;
  931                 olen = len = 4;
  932                 inp = inbuf;
  933                 msdosfs_iconv->convchr(pmp->pm_w2u, __DECONST(const char **,
  934                     &inp), &ilen, (char **)&outp, &olen);
  935                 len -= olen;
  936 
  937                 /*
  938                  * return '?' if failed to convert
  939                  */
  940                 if (len == 0)
  941                         *outp++ = '?';
  942         } else {
  943                 *outp++ = (wc & 0xff00) ? '?' : (u_char)(wc & 0xff);
  944         }
  945 
  946         *outp = '\0';
  947         outp = outbuf;
  948         return (outp);
  949 }
  950 
  951 /*
  952  * Convert Local char to Windows char
  953  */
  954 static u_int16_t
  955 unix2winchr(const u_char **instr, size_t *ilen, int lower, struct msdosfsmount *pmp)
  956 {
  957         u_char *outp, outbuf[3];
  958         u_int16_t wc;
  959         size_t olen;
  960 
  961         if (*ilen == 0)
  962                 return (0);
  963 
  964         if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdosfs_iconv) {
  965                 outp = outbuf;
  966                 olen = 2;
  967                 if (lower & (LCASE_BASE | LCASE_EXT))
  968                         msdosfs_iconv->convchr_case(pmp->pm_u2w, (const char **)instr,
  969                                                   ilen, (char **)&outp, &olen,
  970                                                   KICONV_FROM_LOWER);
  971                 else
  972                         msdosfs_iconv->convchr(pmp->pm_u2w, (const char **)instr,
  973                                              ilen, (char **)&outp, &olen);
  974 
  975                 /*
  976                  * return '' if end of filename
  977                  */
  978                 if (olen == 2)
  979                         return (0);
  980 
  981                 wc = (outbuf[0]<<8) | outbuf[1];
  982 
  983                 return (wc);
  984         }
  985 
  986         (*ilen)--;
  987         wc = (*instr)[0];
  988         if (lower & (LCASE_BASE | LCASE_EXT))
  989                 wc = u2l[wc];
  990         (*instr)++;
  991         return (wc);
  992 }
  993 
  994 /*
  995  * Initialize the temporary concatenation buffer.
  996  */
  997 void
  998 mbnambuf_init(struct mbnambuf *nbp)
  999 {
 1000 
 1001         nbp->nb_len = 0;
 1002         nbp->nb_last_id = -1;
 1003         nbp->nb_buf[sizeof(nbp->nb_buf) - 1] = '\0';
 1004 }
 1005 
 1006 /*
 1007  * Fill out our concatenation buffer with the given substring, at the offset
 1008  * specified by its id.  Since this function must be called with ids in
 1009  * descending order, we take advantage of the fact that ASCII substrings are
 1010  * exactly WIN_CHARS in length.  For non-ASCII substrings, we shift all
 1011  * previous (i.e. higher id) substrings upwards to make room for this one.
 1012  * This only penalizes portions of substrings that contain more than
 1013  * WIN_CHARS bytes when they are first encountered.
 1014  */
 1015 int
 1016 mbnambuf_write(struct mbnambuf *nbp, char *name, int id)
 1017 {
 1018         char *slot;
 1019         size_t count, newlen;
 1020 
 1021         if (nbp->nb_len != 0 && id != nbp->nb_last_id - 1) {
 1022 #ifdef MSDOSFS_DEBUG
 1023                 printf("msdosfs: non-decreasing id: id %d, last id %d\n",
 1024                     id, nbp->nb_last_id);
 1025 #endif
 1026                 return (EINVAL);
 1027         }
 1028 
 1029         /* Will store this substring in a WIN_CHARS-aligned slot. */
 1030         slot = &nbp->nb_buf[id * WIN_CHARS];
 1031         count = strlen(name);
 1032         newlen = nbp->nb_len + count;
 1033         if (newlen > WIN_MAXLEN || newlen > MAXNAMLEN) {
 1034 #ifdef MSDOSFS_DEBUG
 1035                 printf("msdosfs: file name length %zu too large\n", newlen);
 1036 #endif
 1037                 return (ENAMETOOLONG);
 1038         }
 1039 
 1040         /* Shift suffix upwards by the amount length exceeds WIN_CHARS. */
 1041         if (count > WIN_CHARS && nbp->nb_len != 0) {
 1042                 if ((id * WIN_CHARS + count + nbp->nb_len) >
 1043                     sizeof(nbp->nb_buf))
 1044                         return (ENAMETOOLONG);
 1045 
 1046                 bcopy(slot + WIN_CHARS, slot + count, nbp->nb_len);
 1047         }
 1048 
 1049         /* Copy in the substring to its slot and update length so far. */
 1050         bcopy(name, slot, count);
 1051         nbp->nb_len = newlen;
 1052         nbp->nb_last_id = id;
 1053 
 1054         return (0);
 1055 }
 1056 
 1057 /*
 1058  * Take the completed string and use it to setup the struct dirent.
 1059  * Be sure to always nul-terminate the d_name and then copy the string
 1060  * from our buffer.  Note that this function assumes the full string has
 1061  * been reassembled in the buffer.  If it's called before all substrings
 1062  * have been written via mbnambuf_write(), the result will be incorrect.
 1063  */
 1064 char *
 1065 mbnambuf_flush(struct mbnambuf *nbp, struct dirent *dp)
 1066 {
 1067 
 1068         if (nbp->nb_len > sizeof(dp->d_name) - 1) {
 1069                 mbnambuf_init(nbp);
 1070                 return (NULL);
 1071         }
 1072         bcopy(&nbp->nb_buf[0], dp->d_name, nbp->nb_len);
 1073         dp->d_name[nbp->nb_len] = '\0';
 1074         dp->d_namlen = nbp->nb_len;
 1075 
 1076         mbnambuf_init(nbp);
 1077         return (dp->d_name);
 1078 }

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