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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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C
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110/* SPDX-License-Identifier: GPL-2.0 */#ifndef _LINUX_NLS_H#define _LINUX_NLS_H
#include <linux/init.h>
/* Unicode has changed over the years. Unicode code points no longer * fit into 16 bits; as of Unicode 5 valid code points range from 0 * to 0x10ffff (17 planes, where each plane holds 65536 code points). * * The original decision to represent Unicode characters as 16-bit * wchar_t values is now outdated. But plane 0 still includes the * most commonly used characters, so we will retain it. The newer * 32-bit unicode_t type can be used when it is necessary to * represent the full Unicode character set. */
/* Plane-0 Unicode character */typedef u16 wchar_t;#define MAX_WCHAR_T 0xffff
/* Arbitrary Unicode character */typedef u32 unicode_t;
struct nls_table { const char *charset; const char *alias; int (*uni2char) (wchar_t uni, unsigned char *out, int boundlen); int (*char2uni) (const unsigned char *rawstring, int boundlen, wchar_t *uni); const unsigned char *charset2lower; const unsigned char *charset2upper; struct module *owner; struct nls_table *next;};
/* this value hold the maximum octet of charset */#define NLS_MAX_CHARSET_SIZE 6 /* for UTF-8 */
/* Byte order for UTF-16 strings */enum utf16_endian { UTF16_HOST_ENDIAN, UTF16_LITTLE_ENDIAN, UTF16_BIG_ENDIAN};
/* nls_base.c */extern int __register_nls(struct nls_table *, struct module *);extern int unregister_nls(struct nls_table *);extern struct nls_table *load_nls(const char *charset);extern void unload_nls(struct nls_table *);extern struct nls_table *load_nls_default(void);#define register_nls(nls) __register_nls((nls), THIS_MODULE)
extern int utf8_to_utf32(const u8 *s, int len, unicode_t *pu);extern int utf32_to_utf8(unicode_t u, u8 *s, int maxlen);extern int utf8s_to_utf16s(const u8 *s, int len, enum utf16_endian endian, wchar_t *pwcs, int maxlen);extern int utf16s_to_utf8s(const wchar_t *pwcs, int len, enum utf16_endian endian, u8 *s, int maxlen);
static inline unsigned char nls_tolower(struct nls_table *t, unsigned char c){ unsigned char nc = t->charset2lower[c];
return nc ? nc : c;}
static inline unsigned char nls_toupper(struct nls_table *t, unsigned char c){ unsigned char nc = t->charset2upper[c];
return nc ? nc : c;}
static inline int nls_strnicmp(struct nls_table *t, const unsigned char *s1, const unsigned char *s2, int len){ while (len--) { if (nls_tolower(t, *s1++) != nls_tolower(t, *s2++)) return 1; }
return 0;}
/* * nls_nullsize - return length of null character for codepage * @codepage - codepage for which to return length of NULL terminator * * Since we can't guarantee that the null terminator will be a particular * length, we have to check against the codepage. If there's a problem * determining it, assume a single-byte NULL terminator. */static inline intnls_nullsize(const struct nls_table *codepage){ int charlen; char tmp[NLS_MAX_CHARSET_SIZE];
charlen = codepage->uni2char(0, tmp, NLS_MAX_CHARSET_SIZE);
return charlen > 0 ? charlen : 1;}
#define MODULE_ALIAS_NLS(name) MODULE_ALIAS("nls_" __stringify(name))
#endif /* _LINUX_NLS_H */