xref: /kernel/linux/linux-5.10/fs/jfs/jfs_unicode.h (revision 8c2ecf20) 
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
13typedef struct {
14	wchar_t start;
15	wchar_t end;
16	signed char *table;
17} UNICASERANGE;
18
19extern signed char UniUpperTable[512];
20extern UNICASERANGE UniUpperRange[];
21extern int get_UCSname(struct component_name *, struct dentry *);
22extern 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 */
29static 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 */
42static 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 */
59static 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 */
74static 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 */
91static 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 */
108static 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 */
131static 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 */
144