e89dc92096
Following Shaggy's suggestion, do a better job on the unicode string handling routines in cifs in specifying that the wchar_t are really little endian widechars (__le16). Signed-off-by: Steve French <sfrench@us.ibm.com>
353 lines
8 KiB
C
353 lines
8 KiB
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., 2000,2005555555555555555555555555555555555555555555555555555555
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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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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#include <asm/byteorder.h>
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#include <linux/types.h>
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#include <linux/nls.h>
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#define UNIUPR_NOLOWER /* Example to not expand lower case tables */
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/* Just define what we want from uniupr.h. We don't want to define the tables
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* in each source file.
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*/
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#ifndef UNICASERANGE_DEFINED
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struct UniCaseRange {
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wchar_t start;
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wchar_t end;
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signed char *table;
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};
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#endif /* UNICASERANGE_DEFINED */
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#ifndef UNIUPR_NOUPPER
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extern signed char CifsUniUpperTable[512];
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extern const struct UniCaseRange CifsUniUpperRange[];
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#endif /* UNIUPR_NOUPPER */
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#ifndef UNIUPR_NOLOWER
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extern signed char UniLowerTable[512];
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extern struct UniCaseRange UniLowerRange[];
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#endif /* UNIUPR_NOLOWER */
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#ifdef __KERNEL__
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int cifs_strfromUCS_le(char *, const __le16 *, int, const struct nls_table *);
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int cifs_strtoUCS(__le16 *, const char *, int, const struct nls_table *);
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#endif
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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 *
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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++) ; /* To end of first string */
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ucs1--; /* Return to the null */
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while ((*ucs1++ = *ucs2++)) ; /* 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 *
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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
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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 *
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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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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
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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 string (length limited)
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*/
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static inline size_t
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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 *
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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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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
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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 *
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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 *
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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 *
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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) { /* 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
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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 (CifsUniUpperTable)) { /* Latin characters */
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return uc + CifsUniUpperTable[uc]; /* Use base tables */
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} else {
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rp = CifsUniUpperRange; /* 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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}
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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 wchar_t *
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UniStrupr(register wchar_t * upin)
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{
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register wchar_t *up;
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up = upin;
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while (*up) { /* For all characters */
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*up = UniToupper(*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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#ifndef UNIUPR_NOLOWER
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/*
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* UniTolower: Convert a unicode character to lower case
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*/
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static inline wchar_t
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UniTolower(wchar_t uc)
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{
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register struct UniCaseRange *rp;
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if (uc < sizeof (UniLowerTable)) { /* Latin characters */
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return uc + UniLowerTable[uc]; /* Use base tables */
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} else {
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rp = UniLowerRange; /* 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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}
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return uc; /* Past last range */
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}
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/*
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* UniStrlwr: Lower case a unicode string
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*/
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static inline wchar_t *
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UniStrlwr(register wchar_t * upin)
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{
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register wchar_t *up;
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up = upin;
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while (*up) { /* For all characters */
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*up = UniTolower(*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
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