fs/jfs/jfs_unicode.h

   1 /*
   2  *   Copyright (C) International Business Machines Corp., 2000-2002
   3  *   Portions Copyright (C) Christoph Hellwig, 2001-2002
   4  *
   5  *   This program is free software;  you can redistribute it and/or modify
   6  *   it under the terms of the GNU General Public License as published by
   7  *   the Free Software Foundation; either version 2 of the License, or
   8  *   (at your option) any later version.
   9  *
  10  *   This program is distributed in the hope that it will be useful,
  11  *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  13  *   the GNU General Public License for more details.
  14  *
  15  *   You should have received a copy of the GNU General Public License
  16  *   along with this program;  if not, write to the Free Software
  17  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  18  */
  19 #ifndef _H_JFS_UNICODE
  20 #define _H_JFS_UNICODE
  21
  22 #include <linux/slab.h>
  23 #include <asm/byteorder.h>
  24 #include "jfs_types.h"
  25
  26 typedef struct {
  27         wchar_t start;
  28         wchar_t end;
  29         signed char *table;
  30 } UNICASERANGE;
  31
  32 extern signed char UniUpperTable[512];
  33 extern UNICASERANGE UniUpperRange[];
  34 extern int get_UCSname(struct component_name *, struct dentry *);
  35 extern int jfs_strfromUCS_le(char *, const __le16 *, int, struct nls_table *);
  36
  37 #define free_UCSname(COMP) kfree((COMP)->name)
  38
  39 /*
  40  * UniStrcpy:  Copy a string
  41  */
  42 static inline wchar_t *UniStrcpy(wchar_t * ucs1, const wchar_t * ucs2)
  43 {
  44         wchar_t *anchor = ucs1; /* save the start of result string */
  45
  46         while ((*ucs1++ = *ucs2++));
  47         return anchor;
  48 }
  49
  50
  51
  52 /*
  53  * UniStrncpy:  Copy length limited string with pad
  54  */
  55 static inline __le16 *UniStrncpy_le(__le16 * ucs1, const __le16 * ucs2,
  56                                   size_t n)
  57 {
  58         __le16 *anchor = ucs1;
  59
  60         while (n-- && *ucs2)    /* Copy the strings */
  61                 *ucs1++ = *ucs2++;
  62
  63         n++;
  64         while (n--)             /* Pad with nulls */
  65                 *ucs1++ = 0;
  66         return anchor;
  67 }
  68
  69 /*
  70  * UniStrncmp_le:  Compare length limited string - native to little-endian
  71  */
  72 static inline int UniStrncmp_le(const wchar_t * ucs1, const __le16 * ucs2,
  73                                 size_t n)
  74 {
  75         if (!n)
  76                 return 0;       /* Null strings are equal */
  77         while ((*ucs1 == __le16_to_cpu(*ucs2)) && *ucs1 && --n) {
  78                 ucs1++;
  79                 ucs2++;
  80         }
  81         return (int) *ucs1 - (int) __le16_to_cpu(*ucs2);
  82 }
  83
  84 /*
  85  * UniStrncpy_to_le:  Copy length limited string with pad to little-endian
  86  */
  87 static inline __le16 *UniStrncpy_to_le(__le16 * ucs1, const wchar_t * ucs2,
  88                                        size_t n)
  89 {
  90         __le16 *anchor = ucs1;
  91
  92         while (n-- && *ucs2)    /* Copy the strings */
  93                 *ucs1++ = cpu_to_le16(*ucs2++);
  94
  95         n++;
  96         while (n--)             /* Pad with nulls */
  97                 *ucs1++ = 0;
  98         return anchor;
  99 }
 100
 101 /*
 102  * UniStrncpy_from_le:  Copy length limited string with pad from little-endian
 103  */
 104 static inline wchar_t *UniStrncpy_from_le(wchar_t * ucs1, const __le16 * ucs2,
 105                                           size_t n)
 106 {
 107         wchar_t *anchor = ucs1;
 108
 109         while (n-- && *ucs2)    /* Copy the strings */
 110                 *ucs1++ = __le16_to_cpu(*ucs2++);
 111
 112         n++;
 113         while (n--)             /* Pad with nulls */
 114                 *ucs1++ = 0;
 115         return anchor;
 116 }
 117
 118 /*
 119  * UniToupper:  Convert a unicode character to upper case
 120  */
 121 static inline wchar_t UniToupper(wchar_t uc)
 122 {
 123         UNICASERANGE *rp;
 124
 125         if (uc < sizeof(UniUpperTable)) {       /* Latin characters */
 126                 return uc + UniUpperTable[uc];  /* Use base tables */
 127         } else {
 128                 rp = UniUpperRange;     /* Use range tables */
 129                 while (rp->start) {
 130                         if (uc < rp->start)     /* Before start of range */
 131                                 return uc;      /* Uppercase = input */
 132                         if (uc <= rp->end)      /* In range */
 133                                 return uc + rp->table[uc - rp->start];
 134                         rp++;   /* Try next range */
 135                 }
 136         }
 137         return uc;              /* Past last range */
 138 }
 139
 140
 141 /*
 142  * UniStrupr:  Upper case a unicode string
 143  */
 144 static inline wchar_t *UniStrupr(wchar_t * upin)
 145 {
 146         wchar_t *up;
 147
 148         up = upin;
 149         while (*up) {           /* For all characters */
 150                 *up = UniToupper(*up);
 151                 up++;
 152         }
 153         return upin;            /* Return input pointer */
 154 }
 155
 156 #endif                          /* !_H_JFS_UNICODE */