nls: add a nls_nullsize inline
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>
diff --git a/include/linux/nls.h b/include/linux/nls.h
index 6a88220..52b1a76 100644
--- a/include/linux/nls.h
+++ b/include/linux/nls.h
@@ -58,6 +58,25 @@
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))
#endif /* _LINUX_NLS_H */