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nls: add a nls_nullsize inline

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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>
This commit is contained in:
Jeff Layton
2009-04-30 06:45:08 -04:00
committed by Steve French
parent cbb7fe129b
commit d37dc42ab6
1 changed files with 19 additions and 0 deletions
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19
include/linux/nls.h
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@@ -58,6 +58,25 @@ static inline int nls_strnicmp(struct nls_table *t, const unsigned char *s1,
return 0; 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 int
nls_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)) #define MODULE_ALIAS_NLS(name) MODULE_ALIAS("nls_" __stringify(name))
#endif /* _LINUX_NLS_H */ #endif /* _LINUX_NLS_H */