fs/jfs/jfs_unicode.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  *   Copyright (C) International Business Machines Corp., 2000-2002
   4  *   Portions Copyright (C) Christoph Hellwig, 2001-2002
   5  */
   6 #ifndef _H_JFS_UNICODE
   7 #define _H_JFS_UNICODE
   8
   9 #include <linux/slab.h>
  10 #include <asm/byteorder.h>
  11 #include "jfs_types.h"
  12
  13 typedef struct {
  14         wchar_t start;
  15         wchar_t end;
  16         signed char *table;
  17 } UNICASERANGE;
  18
  19 extern signed char UniUpperTable[512];
  20 extern UNICASERANGE UniUpperRange[];
  21 extern int get_UCSname(struct component_name *, struct dentry *);
  22 extern int jfs_strfromUCS_le(char *, const __le16 *, int, struct nls_table *);
  23
  24 #define free_UCSname(COMP) kfree((COMP)->name)
  25
  26 /*
  27  * UniStrcpy:  Copy a string
  28  */
  29 static inline wchar_t *UniStrcpy(wchar_t * ucs1, const wchar_t * ucs2)
  30 {
  31         wchar_t *anchor = ucs1; /* save the start of result string */
  32
  33         while ((*ucs1++ = *ucs2++));
  34         return anchor;
  35 }
  36
  37
  38
  39 /*
  40  * UniStrncpy:  Copy length limited string with pad
  41  */
  42 static inline __le16 *UniStrncpy_le(__le16 * ucs1, const __le16 * ucs2,
  43                                   size_t n)
  44 {
  45         __le16 *anchor = ucs1;
  46
  47         while (n-- && *ucs2)    /* Copy the strings */
  48                 *ucs1++ = *ucs2++;
  49
  50         n++;
  51         while (n--)             /* Pad with nulls */
  52                 *ucs1++ = 0;
  53         return anchor;
  54 }
  55
  56 /*
  57  * UniStrncmp_le:  Compare length limited string - native to little-endian
  58  */
  59 static inline int UniStrncmp_le(const wchar_t * ucs1, const __le16 * ucs2,
  60                                 size_t n)
  61 {
  62         if (!n)
  63                 return 0;       /* Null strings are equal */
  64         while ((*ucs1 == __le16_to_cpu(*ucs2)) && *ucs1 && --n) {
  65                 ucs1++;
  66                 ucs2++;
  67         }
  68         return (int) *ucs1 - (int) __le16_to_cpu(*ucs2);
  69 }
  70
  71 /*
  72  * UniStrncpy_to_le:  Copy length limited string with pad to little-endian
  73  */
  74 static inline __le16 *UniStrncpy_to_le(__le16 * ucs1, const wchar_t * ucs2,
  75                                        size_t n)
  76 {
  77         __le16 *anchor = ucs1;
  78
  79         while (n-- && *ucs2)    /* Copy the strings */
  80                 *ucs1++ = cpu_to_le16(*ucs2++);
  81
  82         n++;
  83         while (n--)             /* Pad with nulls */
  84                 *ucs1++ = 0;
  85         return anchor;
  86 }
  87
  88 /*
  89  * UniStrncpy_from_le:  Copy length limited string with pad from little-endian
  90  */
  91 static inline wchar_t *UniStrncpy_from_le(wchar_t * ucs1, const __le16 * ucs2,
  92                                           size_t n)
  93 {
  94         wchar_t *anchor = ucs1;
  95
  96         while (n-- && *ucs2)    /* Copy the strings */
  97                 *ucs1++ = __le16_to_cpu(*ucs2++);
  98
  99         n++;
 100         while (n--)             /* Pad with nulls */
 101                 *ucs1++ = 0;
 102         return anchor;
 103 }
 104
 105 /*
 106  * UniToupper:  Convert a unicode character to upper case
 107  */
 108 static inline wchar_t UniToupper(wchar_t uc)
 109 {
 110         UNICASERANGE *rp;
 111
 112         if (uc < sizeof(UniUpperTable)) {       /* Latin characters */
 113                 return uc + UniUpperTable[uc];  /* Use base tables */
 114         } else {
 115                 rp = UniUpperRange;     /* Use range tables */
 116                 while (rp->start) {
 117                         if (uc < rp->start)     /* Before start of range */
 118                                 return uc;      /* Uppercase = input */
 119                         if (uc <= rp->end)      /* In range */
 120                                 return uc + rp->table[uc - rp->start];
 121                         rp++;   /* Try next range */
 122                 }
 123         }
 124         return uc;              /* Past last range */
 125 }
 126
 127
 128 /*
 129  * UniStrupr:  Upper case a unicode string
 130  */
 131 static inline wchar_t *UniStrupr(wchar_t * upin)
 132 {
 133         wchar_t *up;
 134
 135         up = upin;
 136         while (*up) {           /* For all characters */
 137                 *up = UniToupper(*up);
 138                 up++;
 139         }
 140         return upin;            /* Return input pointer */
 141 }
 142
 143 #endif                          /* !_H_JFS_UNICODE */