xref: /openbmc/linux/fs/jfs/jfs_unicode.h (revision 22246614)
1 /*
2  *   Copyright (C) International Business Machines Corp., 2000-2002
3  *   Portions Copyright (C) Christoph Hellwig, 2001-2002
4  *
5  *   This program is free software;  you can redistribute it and/or modify
6  *   it under the terms of the GNU General Public License as published by
7  *   the Free Software Foundation; either version 2 of the License, or
8  *   (at your option) any later version.
9  *
10  *   This program is distributed in the hope that it will be useful,
11  *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
13  *   the GNU General Public License for more details.
14  *
15  *   You should have received a copy of the GNU General Public License
16  *   along with this program;  if not, write to the Free Software
17  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18  */
19 #ifndef _H_JFS_UNICODE
20 #define _H_JFS_UNICODE
21 
22 #include <asm/byteorder.h>
23 #include "jfs_types.h"
24 
25 typedef struct {
26 	wchar_t start;
27 	wchar_t end;
28 	signed char *table;
29 } UNICASERANGE;
30 
31 extern signed char UniUpperTable[512];
32 extern UNICASERANGE UniUpperRange[];
33 extern int get_UCSname(struct component_name *, struct dentry *);
34 extern int jfs_strfromUCS_le(char *, const __le16 *, int, struct nls_table *);
35 
36 #define free_UCSname(COMP) kfree((COMP)->name)
37 
38 /*
39  * UniStrcpy:  Copy a string
40  */
41 static inline wchar_t *UniStrcpy(wchar_t * ucs1, const wchar_t * ucs2)
42 {
43 	wchar_t *anchor = ucs1;	/* save the start of result string */
44 
45 	while ((*ucs1++ = *ucs2++));
46 	return anchor;
47 }
48 
49 
50 
51 /*
52  * UniStrncpy:  Copy length limited string with pad
53  */
54 static inline __le16 *UniStrncpy_le(__le16 * ucs1, const __le16 * ucs2,
55 				  size_t n)
56 {
57 	__le16 *anchor = ucs1;
58 
59 	while (n-- && *ucs2)	/* Copy the strings */
60 		*ucs1++ = *ucs2++;
61 
62 	n++;
63 	while (n--)		/* Pad with nulls */
64 		*ucs1++ = 0;
65 	return anchor;
66 }
67 
68 /*
69  * UniStrncmp_le:  Compare length limited string - native to little-endian
70  */
71 static inline int UniStrncmp_le(const wchar_t * ucs1, const __le16 * ucs2,
72 				size_t n)
73 {
74 	if (!n)
75 		return 0;	/* Null strings are equal */
76 	while ((*ucs1 == __le16_to_cpu(*ucs2)) && *ucs1 && --n) {
77 		ucs1++;
78 		ucs2++;
79 	}
80 	return (int) *ucs1 - (int) __le16_to_cpu(*ucs2);
81 }
82 
83 /*
84  * UniStrncpy_to_le:  Copy length limited string with pad to little-endian
85  */
86 static inline __le16 *UniStrncpy_to_le(__le16 * ucs1, const wchar_t * ucs2,
87 				       size_t n)
88 {
89 	__le16 *anchor = ucs1;
90 
91 	while (n-- && *ucs2)	/* Copy the strings */
92 		*ucs1++ = cpu_to_le16(*ucs2++);
93 
94 	n++;
95 	while (n--)		/* Pad with nulls */
96 		*ucs1++ = 0;
97 	return anchor;
98 }
99 
100 /*
101  * UniStrncpy_from_le:  Copy length limited string with pad from little-endian
102  */
103 static inline wchar_t *UniStrncpy_from_le(wchar_t * ucs1, const __le16 * ucs2,
104 					  size_t n)
105 {
106 	wchar_t *anchor = ucs1;
107 
108 	while (n-- && *ucs2)	/* Copy the strings */
109 		*ucs1++ = __le16_to_cpu(*ucs2++);
110 
111 	n++;
112 	while (n--)		/* Pad with nulls */
113 		*ucs1++ = 0;
114 	return anchor;
115 }
116 
117 /*
118  * UniToupper:  Convert a unicode character to upper case
119  */
120 static inline wchar_t UniToupper(wchar_t uc)
121 {
122 	UNICASERANGE *rp;
123 
124 	if (uc < sizeof(UniUpperTable)) {	/* Latin characters */
125 		return uc + UniUpperTable[uc];	/* Use base tables */
126 	} else {
127 		rp = UniUpperRange;	/* Use range tables */
128 		while (rp->start) {
129 			if (uc < rp->start)	/* Before start of range */
130 				return uc;	/* Uppercase = input */
131 			if (uc <= rp->end)	/* In range */
132 				return uc + rp->table[uc - rp->start];
133 			rp++;	/* Try next range */
134 		}
135 	}
136 	return uc;		/* Past last range */
137 }
138 
139 
140 /*
141  * UniStrupr:  Upper case a unicode string
142  */
143 static inline wchar_t *UniStrupr(wchar_t * upin)
144 {
145 	wchar_t *up;
146 
147 	up = upin;
148 	while (*up) {		/* For all characters */
149 		*up = UniToupper(*up);
150 		up++;
151 	}
152 	return upin;		/* Return input pointer */
153 }
154 
155 #endif				/* !_H_JFS_UNICODE */
156