linux/fs/nls/nls_ucs2_utils.h
Dr. David Alan Gilbert f3a9b3758e fs/jfs: Use common ucs2 upper case table
Use the UCS-2 upper case tables from nls, that are shared
with smb.

This code in JFS is hard to test, so we're only reusing the
same tables (which are identical), not trying to reuse the
rest of the helper functions.

Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
Reviewed-by: Dave Kleikamp <dave.kleikamp@oracle.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
2023-08-30 08:55:52 -05:00

286 lines
6.4 KiB
C

/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Some of the source code in this file came from fs/cifs/cifs_unicode.c
* and then via server/unicode.c
* cifs_unicode: Unicode kernel case support
*
* Function:
* Convert a unicode character to upper or lower case using
* compressed tables.
*
* Copyright (c) International Business Machines Corp., 2000,2009
*
*
* Notes:
* These APIs are based on the C library functions. The semantics
* should match the C functions but with expanded size operands.
*
* The upper/lower functions are based on a table created by mkupr.
* This is a compressed table of upper and lower case conversion.
*
*/
#ifndef _NLS_UCS2_UTILS_H
#define _NLS_UCS2_UTILS_H
#include <asm/byteorder.h>
#include <linux/types.h>
#include <linux/nls.h>
#include <linux/unicode.h>
#include "nls_ucs2_data.h"
/*
* Windows maps these to the user defined 16 bit Unicode range since they are
* reserved symbols (along with \ and /), otherwise illegal to store
* in filenames in NTFS
*/
#define UNI_ASTERISK ((__u16)('*' + 0xF000))
#define UNI_QUESTION ((__u16)('?' + 0xF000))
#define UNI_COLON ((__u16)(':' + 0xF000))
#define UNI_GRTRTHAN ((__u16)('>' + 0xF000))
#define UNI_LESSTHAN ((__u16)('<' + 0xF000))
#define UNI_PIPE ((__u16)('|' + 0xF000))
#define UNI_SLASH ((__u16)('\\' + 0xF000))
/*
* UniStrcat: Concatenate the second string to the first
*
* Returns:
* Address of the first string
*/
static inline wchar_t *UniStrcat(wchar_t *ucs1, const wchar_t *ucs2)
{
wchar_t *anchor = ucs1; /* save a pointer to start of ucs1 */
while (*ucs1++)
/*NULL*/; /* To end of first string */
ucs1--; /* Return to the null */
while ((*ucs1++ = *ucs2++))
/*NULL*/; /* copy string 2 over */
return anchor;
}
/*
* UniStrchr: Find a character in a string
*
* Returns:
* Address of first occurrence of character in string
* or NULL if the character is not in the string
*/
static inline wchar_t *UniStrchr(const wchar_t *ucs, wchar_t uc)
{
while ((*ucs != uc) && *ucs)
ucs++;
if (*ucs == uc)
return (wchar_t *)ucs;
return NULL;
}
/*
* UniStrcmp: Compare two strings
*
* Returns:
* < 0: First string is less than second
* = 0: Strings are equal
* > 0: First string is greater than second
*/
static inline int UniStrcmp(const wchar_t *ucs1, const wchar_t *ucs2)
{
while ((*ucs1 == *ucs2) && *ucs1) {
ucs1++;
ucs2++;
}
return (int)*ucs1 - (int)*ucs2;
}
/*
* UniStrcpy: Copy a string
*/
static inline wchar_t *UniStrcpy(wchar_t *ucs1, const wchar_t *ucs2)
{
wchar_t *anchor = ucs1; /* save the start of result string */
while ((*ucs1++ = *ucs2++))
/*NULL*/;
return anchor;
}
/*
* UniStrlen: Return the length of a string (in 16 bit Unicode chars not bytes)
*/
static inline size_t UniStrlen(const wchar_t *ucs1)
{
int i = 0;
while (*ucs1++)
i++;
return i;
}
/*
* UniStrnlen: Return the length (in 16 bit Unicode chars not bytes) of a
* string (length limited)
*/
static inline size_t UniStrnlen(const wchar_t *ucs1, int maxlen)
{
int i = 0;
while (*ucs1++) {
i++;
if (i >= maxlen)
break;
}
return i;
}
/*
* UniStrncat: Concatenate length limited string
*/
static inline wchar_t *UniStrncat(wchar_t *ucs1, const wchar_t *ucs2, size_t n)
{
wchar_t *anchor = ucs1; /* save pointer to string 1 */
while (*ucs1++)
/*NULL*/;
ucs1--; /* point to null terminator of s1 */
while (n-- && (*ucs1 = *ucs2)) { /* copy s2 after s1 */
ucs1++;
ucs2++;
}
*ucs1 = 0; /* Null terminate the result */
return anchor;
}
/*
* UniStrncmp: Compare length limited string
*/
static inline int UniStrncmp(const wchar_t *ucs1, const wchar_t *ucs2, size_t n)
{
if (!n)
return 0; /* Null strings are equal */
while ((*ucs1 == *ucs2) && *ucs1 && --n) {
ucs1++;
ucs2++;
}
return (int)*ucs1 - (int)*ucs2;
}
/*
* UniStrncmp_le: Compare length limited string - native to little-endian
*/
static inline int
UniStrncmp_le(const wchar_t *ucs1, const wchar_t *ucs2, size_t n)
{
if (!n)
return 0; /* Null strings are equal */
while ((*ucs1 == __le16_to_cpu(*ucs2)) && *ucs1 && --n) {
ucs1++;
ucs2++;
}
return (int)*ucs1 - (int)__le16_to_cpu(*ucs2);
}
/*
* UniStrncpy: Copy length limited string with pad
*/
static inline wchar_t *UniStrncpy(wchar_t *ucs1, const wchar_t *ucs2, size_t n)
{
wchar_t *anchor = ucs1;
while (n-- && *ucs2) /* Copy the strings */
*ucs1++ = *ucs2++;
n++;
while (n--) /* Pad with nulls */
*ucs1++ = 0;
return anchor;
}
/*
* UniStrncpy_le: Copy length limited string with pad to little-endian
*/
static inline wchar_t *UniStrncpy_le(wchar_t *ucs1, const wchar_t *ucs2, size_t n)
{
wchar_t *anchor = ucs1;
while (n-- && *ucs2) /* Copy the strings */
*ucs1++ = __le16_to_cpu(*ucs2++);
n++;
while (n--) /* Pad with nulls */
*ucs1++ = 0;
return anchor;
}
/*
* UniStrstr: Find a string in a string
*
* Returns:
* Address of first match found
* NULL if no matching string is found
*/
static inline wchar_t *UniStrstr(const wchar_t *ucs1, const wchar_t *ucs2)
{
const wchar_t *anchor1 = ucs1;
const wchar_t *anchor2 = ucs2;
while (*ucs1) {
if (*ucs1 == *ucs2) {
/* Partial match found */
ucs1++;
ucs2++;
} else {
if (!*ucs2) /* Match found */
return (wchar_t *)anchor1;
ucs1 = ++anchor1; /* No match */
ucs2 = anchor2;
}
}
if (!*ucs2) /* Both end together */
return (wchar_t *)anchor1; /* Match found */
return NULL; /* No match */
}
#ifndef UNIUPR_NOUPPER
/*
* UniToupper: Convert a unicode character to upper case
*/
static inline wchar_t UniToupper(register wchar_t uc)
{
register const struct UniCaseRange *rp;
if (uc < sizeof(NlsUniUpperTable)) {
/* Latin characters */
return uc + NlsUniUpperTable[uc]; /* Use base tables */
}
rp = NlsUniUpperRange; /* Use range tables */
while (rp->start) {
if (uc < rp->start) /* Before start of range */
return uc; /* Uppercase = input */
if (uc <= rp->end) /* In range */
return uc + rp->table[uc - rp->start];
rp++; /* Try next range */
}
return uc; /* Past last range */
}
/*
* UniStrupr: Upper case a unicode string
*/
static inline __le16 *UniStrupr(register __le16 *upin)
{
register __le16 *up;
up = upin;
while (*up) { /* For all characters */
*up = cpu_to_le16(UniToupper(le16_to_cpu(*up)));
up++;
}
return upin; /* Return input pointer */
}
#endif /* UNIUPR_NOUPPER */
#endif /* _NLS_UCS2_UTILS_H */