2 * cifs_unicode: Unicode kernel case support
5 * Convert a unicode character to upper or lower case using
8 * Copyright (c) International Business Machines Corp., 2000,2007
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
18 * the GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
26 * These APIs are based on the C library functions. The semantics
27 * should match the C functions but with expanded size operands.
29 * The upper/lower functions are based on a table created by mkupr.
30 * This is a compressed table of upper and lower case conversion.
34 #include <asm/byteorder.h>
35 #include <linux/types.h>
36 #include <linux/nls.h>
38 #define UNIUPR_NOLOWER /* Example to not expand lower case tables */
40 /* Just define what we want from uniupr.h. We don't want to define the tables
41 * in each source file.
43 #ifndef UNICASERANGE_DEFINED
49 #endif /* UNICASERANGE_DEFINED */
51 #ifndef UNIUPR_NOUPPER
52 extern signed char CifsUniUpperTable[512];
53 extern const struct UniCaseRange CifsUniUpperRange[];
54 #endif /* UNIUPR_NOUPPER */
56 #ifndef UNIUPR_NOLOWER
57 extern signed char UniLowerTable[512];
58 extern struct UniCaseRange UniLowerRange[];
59 #endif /* UNIUPR_NOLOWER */
62 int cifs_strfromUCS_le(char *, const __le16 *, int, const struct nls_table *);
63 int cifs_strtoUCS(__le16 *, const char *, int, const struct nls_table *);
67 * UniStrcat: Concatenate the second string to the first
70 * Address of the first string
72 static inline wchar_t *
73 UniStrcat(wchar_t *ucs1, const wchar_t *ucs2)
75 wchar_t *anchor = ucs1; /* save a pointer to start of ucs1 */
77 while (*ucs1++) ; /* To end of first string */
78 ucs1--; /* Return to the null */
79 while ((*ucs1++ = *ucs2++)) ; /* copy string 2 over */
84 * UniStrchr: Find a character in a string
87 * Address of first occurrence of character in string
88 * or NULL if the character is not in the string
90 static inline wchar_t *
91 UniStrchr(const wchar_t *ucs, wchar_t uc)
93 while ((*ucs != uc) && *ucs)
97 return (wchar_t *) ucs;
102 * UniStrcmp: Compare two strings
105 * < 0: First string is less than second
106 * = 0: Strings are equal
107 * > 0: First string is greater than second
110 UniStrcmp(const wchar_t *ucs1, const wchar_t *ucs2)
112 while ((*ucs1 == *ucs2) && *ucs1) {
116 return (int) *ucs1 - (int) *ucs2;
120 * UniStrcpy: Copy a string
122 static inline wchar_t *
123 UniStrcpy(wchar_t *ucs1, const wchar_t *ucs2)
125 wchar_t *anchor = ucs1; /* save the start of result string */
127 while ((*ucs1++ = *ucs2++)) ;
132 * UniStrlen: Return the length of a string (in 16 bit Unicode chars not bytes)
135 UniStrlen(const wchar_t *ucs1)
145 * UniStrnlen: Return the length (in 16 bit Unicode chars not bytes) of a
146 * string (length limited)
149 UniStrnlen(const wchar_t *ucs1, int maxlen)
162 * UniStrncat: Concatenate length limited string
164 static inline wchar_t *
165 UniStrncat(wchar_t *ucs1, const wchar_t *ucs2, size_t n)
167 wchar_t *anchor = ucs1; /* save pointer to string 1 */
170 ucs1--; /* point to null terminator of s1 */
171 while (n-- && (*ucs1 = *ucs2)) { /* copy s2 after s1 */
175 *ucs1 = 0; /* Null terminate the result */
180 * UniStrncmp: Compare length limited string
183 UniStrncmp(const wchar_t *ucs1, const wchar_t *ucs2, size_t n)
186 return 0; /* Null strings are equal */
187 while ((*ucs1 == *ucs2) && *ucs1 && --n) {
191 return (int) *ucs1 - (int) *ucs2;
195 * UniStrncmp_le: Compare length limited string - native to little-endian
198 UniStrncmp_le(const wchar_t *ucs1, const wchar_t *ucs2, size_t n)
201 return 0; /* Null strings are equal */
202 while ((*ucs1 == __le16_to_cpu(*ucs2)) && *ucs1 && --n) {
206 return (int) *ucs1 - (int) __le16_to_cpu(*ucs2);
210 * UniStrncpy: Copy length limited string with pad
212 static inline wchar_t *
213 UniStrncpy(wchar_t *ucs1, const wchar_t *ucs2, size_t n)
215 wchar_t *anchor = ucs1;
217 while (n-- && *ucs2) /* Copy the strings */
221 while (n--) /* Pad with nulls */
227 * UniStrncpy_le: Copy length limited string with pad to little-endian
229 static inline wchar_t *
230 UniStrncpy_le(wchar_t *ucs1, const wchar_t *ucs2, size_t n)
232 wchar_t *anchor = ucs1;
234 while (n-- && *ucs2) /* Copy the strings */
235 *ucs1++ = __le16_to_cpu(*ucs2++);
238 while (n--) /* Pad with nulls */
244 * UniStrstr: Find a string in a string
247 * Address of first match found
248 * NULL if no matching string is found
250 static inline wchar_t *
251 UniStrstr(const wchar_t *ucs1, const wchar_t *ucs2)
253 const wchar_t *anchor1 = ucs1;
254 const wchar_t *anchor2 = ucs2;
257 if (*ucs1 == *ucs2) {
258 /* Partial match found */
262 if (!*ucs2) /* Match found */
263 return (wchar_t *) anchor1;
264 ucs1 = ++anchor1; /* No match */
269 if (!*ucs2) /* Both end together */
270 return (wchar_t *) anchor1; /* Match found */
271 return NULL; /* No match */
274 #ifndef UNIUPR_NOUPPER
276 * UniToupper: Convert a unicode character to upper case
278 static inline wchar_t
279 UniToupper(register wchar_t uc)
281 register const struct UniCaseRange *rp;
283 if (uc < sizeof(CifsUniUpperTable)) {
284 /* Latin characters */
285 return uc + CifsUniUpperTable[uc]; /* Use base tables */
287 rp = CifsUniUpperRange; /* Use range tables */
289 if (uc < rp->start) /* Before start of range */
290 return uc; /* Uppercase = input */
291 if (uc <= rp->end) /* In range */
292 return uc + rp->table[uc - rp->start];
293 rp++; /* Try next range */
296 return uc; /* Past last range */
300 * UniStrupr: Upper case a unicode string
302 static inline wchar_t *
303 UniStrupr(register wchar_t *upin)
305 register wchar_t *up;
308 while (*up) { /* For all characters */
309 *up = UniToupper(*up);
312 return upin; /* Return input pointer */
314 #endif /* UNIUPR_NOUPPER */
316 #ifndef UNIUPR_NOLOWER
318 * UniTolower: Convert a unicode character to lower case
320 static inline wchar_t
321 UniTolower(wchar_t uc)
323 register struct UniCaseRange *rp;
325 if (uc < sizeof(UniLowerTable)) {
326 /* Latin characters */
327 return uc + UniLowerTable[uc]; /* Use base tables */
329 rp = UniLowerRange; /* Use range tables */
331 if (uc < rp->start) /* Before start of range */
332 return uc; /* Uppercase = input */
333 if (uc <= rp->end) /* In range */
334 return uc + rp->table[uc - rp->start];
335 rp++; /* Try next range */
338 return uc; /* Past last range */
342 * UniStrlwr: Lower case a unicode string
344 static inline wchar_t *
345 UniStrlwr(register wchar_t *upin)
347 register wchar_t *up;
350 while (*up) { /* For all characters */
351 *up = UniTolower(*up);
354 return upin; /* Return input pointer */