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