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  */
UniStrcpy(wchar_t * ucs1,const wchar_t * ucs2)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  */
UniStrncpy_le(__le16 * ucs1,const __le16 * ucs2,size_t n)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  */
UniStrncmp_le(const wchar_t * ucs1,const __le16 * ucs2,size_t n)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  */
UniStrncpy_to_le(__le16 * ucs1,const wchar_t * ucs2,size_t n)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  */
UniStrncpy_from_le(wchar_t * ucs1,const __le16 * ucs2,size_t n)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  */
UniToupper(wchar_t uc)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  */
UniStrupr(wchar_t * upin)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 */
144