d37dc42ab6
It's possible for character sets to require a multi-byte null string terminator. Add a helper function that determines the size of the null terminator at runtime. Signed-off-by: Jeff Layton <jlayton@redhat.com> Acked-by: Suresh Jayaraman <sjayaraman@suse.de> Signed-off-by: Steve French <sfrench@us.ibm.com>
83 lines
2.1 KiB
C
83 lines
2.1 KiB
C
#ifndef _LINUX_NLS_H
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#define _LINUX_NLS_H
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#include <linux/init.h>
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/* unicode character */
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typedef __u16 wchar_t;
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struct nls_table {
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const char *charset;
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const char *alias;
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int (*uni2char) (wchar_t uni, unsigned char *out, int boundlen);
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int (*char2uni) (const unsigned char *rawstring, int boundlen,
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wchar_t *uni);
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const unsigned char *charset2lower;
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const unsigned char *charset2upper;
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struct module *owner;
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struct nls_table *next;
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};
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/* this value hold the maximum octet of charset */
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#define NLS_MAX_CHARSET_SIZE 6 /* for UTF-8 */
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/* nls.c */
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extern int register_nls(struct nls_table *);
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extern int unregister_nls(struct nls_table *);
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extern struct nls_table *load_nls(char *);
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extern void unload_nls(struct nls_table *);
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extern struct nls_table *load_nls_default(void);
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extern int utf8_mbtowc(wchar_t *, const __u8 *, int);
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extern int utf8_mbstowcs(wchar_t *, const __u8 *, int);
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extern int utf8_wctomb(__u8 *, wchar_t, int);
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extern int utf8_wcstombs(__u8 *, const wchar_t *, int);
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static inline unsigned char nls_tolower(struct nls_table *t, unsigned char c)
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{
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unsigned char nc = t->charset2lower[c];
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return nc ? nc : c;
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}
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static inline unsigned char nls_toupper(struct nls_table *t, unsigned char c)
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{
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unsigned char nc = t->charset2upper[c];
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return nc ? nc : c;
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}
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static inline int nls_strnicmp(struct nls_table *t, const unsigned char *s1,
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const unsigned char *s2, int len)
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{
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while (len--) {
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if (nls_tolower(t, *s1++) != nls_tolower(t, *s2++))
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return 1;
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}
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return 0;
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}
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/*
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* nls_nullsize - return length of null character for codepage
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* @codepage - codepage for which to return length of NULL terminator
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*
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* Since we can't guarantee that the null terminator will be a particular
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* length, we have to check against the codepage. If there's a problem
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* determining it, assume a single-byte NULL terminator.
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*/
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static inline int
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nls_nullsize(const struct nls_table *codepage)
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{
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int charlen;
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char tmp[NLS_MAX_CHARSET_SIZE];
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charlen = codepage->uni2char(0, tmp, NLS_MAX_CHARSET_SIZE);
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return charlen > 0 ? charlen : 1;
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}
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#define MODULE_ALIAS_NLS(name) MODULE_ALIAS("nls_" __stringify(name))
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#endif /* _LINUX_NLS_H */
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