The multibyte conversion functions are similar to the one-byte conversion functions toupper and tolower. These functions convert wide-characters to other wide characters. For more information on conversion routines, see the man pages for wconv(3) and cconv(3).
The following routines are in the regular Chinese C library.
Table 12–3 Simplified Chinese Case Conversion Functions (declared in zh/xctype.h)| Function | Description | 
|---|---|
| tocupper | Converts code set1 Roman lowercase to uppercase | 
| toclower | Converts code set1 Roman uppercase to lowercase |