Version:  2.6.34 2.6.35 2.6.36 2.6.37 2.6.38 2.6.39 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14

Linux/include/linux/nls.h

  1 #ifndef _LINUX_NLS_H
  2 #define _LINUX_NLS_H
  3 
  4 #include <linux/init.h>
  5 
  6 /* Unicode has changed over the years.  Unicode code points no longer
  7  * fit into 16 bits; as of Unicode 5 valid code points range from 0
  8  * to 0x10ffff (17 planes, where each plane holds 65536 code points).
  9  *
 10  * The original decision to represent Unicode characters as 16-bit
 11  * wchar_t values is now outdated.  But plane 0 still includes the
 12  * most commonly used characters, so we will retain it.  The newer
 13  * 32-bit unicode_t type can be used when it is necessary to
 14  * represent the full Unicode character set.
 15  */
 16 
 17 /* Plane-0 Unicode character */
 18 typedef u16 wchar_t;
 19 #define MAX_WCHAR_T     0xffff
 20 
 21 /* Arbitrary Unicode character */
 22 typedef u32 unicode_t;
 23 
 24 struct nls_table {
 25         const char *charset;
 26         const char *alias;
 27         int (*uni2char) (wchar_t uni, unsigned char *out, int boundlen);
 28         int (*char2uni) (const unsigned char *rawstring, int boundlen,
 29                          wchar_t *uni);
 30         const unsigned char *charset2lower;
 31         const unsigned char *charset2upper;
 32         struct module *owner;
 33         struct nls_table *next;
 34 };
 35 
 36 /* this value hold the maximum octet of charset */
 37 #define NLS_MAX_CHARSET_SIZE 6 /* for UTF-8 */
 38 
 39 /* Byte order for UTF-16 strings */
 40 enum utf16_endian {
 41         UTF16_HOST_ENDIAN,
 42         UTF16_LITTLE_ENDIAN,
 43         UTF16_BIG_ENDIAN
 44 };
 45 
 46 /* nls_base.c */
 47 extern int __register_nls(struct nls_table *, struct module *);
 48 extern int unregister_nls(struct nls_table *);
 49 extern struct nls_table *load_nls(char *);
 50 extern void unload_nls(struct nls_table *);
 51 extern struct nls_table *load_nls_default(void);
 52 #define register_nls(nls) __register_nls((nls), THIS_MODULE)
 53 
 54 extern int utf8_to_utf32(const u8 *s, int len, unicode_t *pu);
 55 extern int utf32_to_utf8(unicode_t u, u8 *s, int maxlen);
 56 extern int utf8s_to_utf16s(const u8 *s, int len,
 57                 enum utf16_endian endian, wchar_t *pwcs, int maxlen);
 58 extern int utf16s_to_utf8s(const wchar_t *pwcs, int len,
 59                 enum utf16_endian endian, u8 *s, int maxlen);
 60 
 61 static inline unsigned char nls_tolower(struct nls_table *t, unsigned char c)
 62 {
 63         unsigned char nc = t->charset2lower[c];
 64 
 65         return nc ? nc : c;
 66 }
 67 
 68 static inline unsigned char nls_toupper(struct nls_table *t, unsigned char c)
 69 {
 70         unsigned char nc = t->charset2upper[c];
 71 
 72         return nc ? nc : c;
 73 }
 74 
 75 static inline int nls_strnicmp(struct nls_table *t, const unsigned char *s1,
 76                 const unsigned char *s2, int len)
 77 {
 78         while (len--) {
 79                 if (nls_tolower(t, *s1++) != nls_tolower(t, *s2++))
 80                         return 1;
 81         }
 82 
 83         return 0;
 84 }
 85 
 86 /*
 87  * nls_nullsize - return length of null character for codepage
 88  * @codepage - codepage for which to return length of NULL terminator
 89  *
 90  * Since we can't guarantee that the null terminator will be a particular
 91  * length, we have to check against the codepage. If there's a problem
 92  * determining it, assume a single-byte NULL terminator.
 93  */
 94 static inline int
 95 nls_nullsize(const struct nls_table *codepage)
 96 {
 97         int charlen;
 98         char tmp[NLS_MAX_CHARSET_SIZE];
 99 
100         charlen = codepage->uni2char(0, tmp, NLS_MAX_CHARSET_SIZE);
101 
102         return charlen > 0 ? charlen : 1;
103 }
104 
105 #define MODULE_ALIAS_NLS(name)  MODULE_ALIAS("nls_" __stringify(name))
106 
107 #endif /* _LINUX_NLS_H */
108 
109 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us