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 <asm/byteorder.h>
  23 #include "jfs_types.h"
  24
  25 typedef struct {
  26         wchar_t start;
  27         wchar_t end;
  28         signed char *table;
  29 } UNICASERANGE;
  30
  31 extern signed char UniUpperTable[512];
  32 extern UNICASERANGE UniUpperRange[];
  33 extern int get_UCSname(struct component_name *, struct dentry *);
  34 extern int jfs_strfromUCS_le(char *, const __le16 *, int, struct nls_table *);
  35
  36 #define free_UCSname(COMP) kfree((COMP)->name)
  37
  38 /*
  39  * UniStrcpy:  Copy a string
  40  */
  41 static inline wchar_t *UniStrcpy(wchar_t * ucs1, const wchar_t * ucs2)
  42 {
  43         wchar_t *anchor = ucs1; /* save the start of result string */
  44
  45         while ((*ucs1++ = *ucs2++));
  46         return anchor;
  47 }
  48
  49
  50
  51 /*
  52  * UniStrncpy:  Copy length limited string with pad
  53  */
  54 static inline __le16 *UniStrncpy_le(__le16 * ucs1, const __le16 * ucs2,
  55                                   size_t n)
  56 {
  57         __le16 *anchor = ucs1;
  58
  59         while (n-- && *ucs2)    /* Copy the strings */
  60                 *ucs1++ = *ucs2++;
  61
  62         n++;
  63         while (n--)             /* Pad with nulls */
  64                 *ucs1++ = 0;
  65         return anchor;
  66 }
  67
  68 /*
  69  * UniStrncmp_le:  Compare length limited string - native to little-endian
  70  */
  71 static inline int UniStrncmp_le(const wchar_t * ucs1, const __le16 * ucs2,
  72                                 size_t n)
  73 {
  74         if (!n)
  75                 return 0;       /* Null strings are equal */
  76         while ((*ucs1 == __le16_to_cpu(*ucs2)) && *ucs1 && --n) {
  77                 ucs1++;
  78                 ucs2++;
  79         }
  80         return (int) *ucs1 - (int) __le16_to_cpu(*ucs2);
  81 }
  82
  83 /*
  84  * UniStrncpy_to_le:  Copy length limited string with pad to little-endian
  85  */
  86 static inline __le16 *UniStrncpy_to_le(__le16 * ucs1, const wchar_t * ucs2,
  87                                        size_t n)
  88 {
  89         __le16 *anchor = ucs1;
  90
  91         while (n-- && *ucs2)    /* Copy the strings */
  92                 *ucs1++ = cpu_to_le16(*ucs2++);
  93
  94         n++;
  95         while (n--)             /* Pad with nulls */
  96                 *ucs1++ = 0;
  97         return anchor;
  98 }
  99
 100 /*
 101  * UniStrncpy_from_le:  Copy length limited string with pad from little-endian
 102  */
 103 static inline wchar_t *UniStrncpy_from_le(wchar_t * ucs1, const __le16 * ucs2,
 104                                           size_t n)
 105 {
 106         wchar_t *anchor = ucs1;
 107
 108         while (n-- && *ucs2)    /* Copy the strings */
 109                 *ucs1++ = __le16_to_cpu(*ucs2++);
 110
 111         n++;
 112         while (n--)             /* Pad with nulls */
 113                 *ucs1++ = 0;
 114         return anchor;
 115 }
 116
 117 /*
 118  * UniToupper:  Convert a unicode character to upper case
 119  */
 120 static inline wchar_t UniToupper(wchar_t uc)
 121 {
 122         UNICASERANGE *rp;
 123
 124         if (uc < sizeof(UniUpperTable)) {       /* Latin characters */
 125                 return uc + UniUpperTable[uc];  /* Use base tables */
 126         } else {
 127                 rp = UniUpperRange;     /* Use range tables */
 128                 while (rp->start) {
 129                         if (uc < rp->start)     /* Before start of range */
 130                                 return uc;      /* Uppercase = input */
 131                         if (uc <= rp->end)      /* In range */
 132                                 return uc + rp->table[uc - rp->start];
 133                         rp++;   /* Try next range */
 134                 }
 135         }
 136         return uc;              /* Past last range */
 137 }
 138
 139
 140 /*
 141  * UniStrupr:  Upper case a unicode string
 142  */
 143 static inline wchar_t *UniStrupr(wchar_t * upin)
 144 {
 145         wchar_t *up;
 146
 147         up = upin;
 148         while (*up) {           /* For all characters */
 149                 *up = UniToupper(*up);
 150                 up++;
 151         }
 152         return upin;            /* Return input pointer */
 153 }
 154
 155 #endif                          /* !_H_JFS_UNICODE */