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 "../nls/nls_ucs2_data.h"
  12 #include "jfs_types.h"
  13
  14 extern int get_UCSname(struct component_name *, struct dentry *);
  15 extern int jfs_strfromUCS_le(char *, const __le16 *, int, struct nls_table *);
  16
  17 #define free_UCSname(COMP) kfree((COMP)->name)
  18
  19 /*
  20  * UniStrcpy:  Copy a string
  21  */
  22 static inline wchar_t *UniStrcpy(wchar_t * ucs1, const wchar_t * ucs2)
  23 {
  24         wchar_t *anchor = ucs1; /* save the start of result string */
  25
  26         while ((*ucs1++ = *ucs2++));
  27         return anchor;
  28 }
  29
  30
  31
  32 /*
  33  * UniStrncpy:  Copy length limited string with pad
  34  */
  35 static inline __le16 *UniStrncpy_le(__le16 * ucs1, const __le16 * ucs2,
  36                                   size_t n)
  37 {
  38         __le16 *anchor = ucs1;
  39
  40         while (n-- && *ucs2)    /* Copy the strings */
  41                 *ucs1++ = *ucs2++;
  42
  43         n++;
  44         while (n--)             /* Pad with nulls */
  45                 *ucs1++ = 0;
  46         return anchor;
  47 }
  48
  49 /*
  50  * UniStrncmp_le:  Compare length limited string - native to little-endian
  51  */
  52 static inline int UniStrncmp_le(const wchar_t * ucs1, const __le16 * ucs2,
  53                                 size_t n)
  54 {
  55         if (!n)
  56                 return 0;       /* Null strings are equal */
  57         while ((*ucs1 == __le16_to_cpu(*ucs2)) && *ucs1 && --n) {
  58                 ucs1++;
  59                 ucs2++;
  60         }
  61         return (int) *ucs1 - (int) __le16_to_cpu(*ucs2);
  62 }
  63
  64 /*
  65  * UniStrncpy_to_le:  Copy length limited string with pad to little-endian
  66  */
  67 static inline __le16 *UniStrncpy_to_le(__le16 * ucs1, const wchar_t * ucs2,
  68                                        size_t n)
  69 {
  70         __le16 *anchor = ucs1;
  71
  72         while (n-- && *ucs2)    /* Copy the strings */
  73                 *ucs1++ = cpu_to_le16(*ucs2++);
  74
  75         n++;
  76         while (n--)             /* Pad with nulls */
  77                 *ucs1++ = 0;
  78         return anchor;
  79 }
  80
  81 /*
  82  * UniStrncpy_from_le:  Copy length limited string with pad from little-endian
  83  */
  84 static inline wchar_t *UniStrncpy_from_le(wchar_t * ucs1, const __le16 * ucs2,
  85                                           size_t n)
  86 {
  87         wchar_t *anchor = ucs1;
  88
  89         while (n-- && *ucs2)    /* Copy the strings */
  90                 *ucs1++ = __le16_to_cpu(*ucs2++);
  91
  92         n++;
  93         while (n--)             /* Pad with nulls */
  94                 *ucs1++ = 0;
  95         return anchor;
  96 }
  97
  98 /*
  99  * UniToupper:  Convert a unicode character to upper case
 100  */
 101 static inline wchar_t UniToupper(wchar_t uc)
 102 {
 103         const struct UniCaseRange *rp;
 104
 105         if (uc < sizeof(NlsUniUpperTable)) {    /* Latin characters */
 106                 return uc + NlsUniUpperTable[uc];       /* Use base tables */
 107         } else {
 108                 rp = NlsUniUpperRange;  /* Use range tables */
 109                 while (rp->start) {
 110                         if (uc < rp->start)     /* Before start of range */
 111                                 return uc;      /* Uppercase = input */
 112                         if (uc <= rp->end)      /* In range */
 113                                 return uc + rp->table[uc - rp->start];
 114                         rp++;   /* Try next range */
 115                 }
 116         }
 117         return uc;              /* Past last range */
 118 }
 119
 120
 121 /*
 122  * UniStrupr:  Upper case a unicode string
 123  */
 124 static inline wchar_t *UniStrupr(wchar_t * upin)
 125 {
 126         wchar_t *up;
 127
 128         up = upin;
 129         while (*up) {           /* For all characters */
 130                 *up = UniToupper(*up);
 131                 up++;
 132         }
 133         return upin;            /* Return input pointer */
 134 }
 135
 136 #endif                          /* !_H_JFS_UNICODE */