toupper, _toupper, towupper, _toupper_l, _towupper_l
Convert character to uppercase.
int toupper( int c ); int _toupper( int c ); int towupper( wint_t c ); int _toupper_l( int c , _locale_t locale ); int _towupper_l( wint_t c , _locale_t locale );
Each of these routines converts a copy of c, if possible, and returns the result.
If c is a wide character for which iswlower is nonzero and there is a corresponding wide character for which iswupper is nonzero, towupper returns the corresponding wide character; otherwise, towupper returns c unchanged.
There is no return value reserved to indicate an error.
Each of these routines converts a given lowercase letter to an uppercase letter if possible and appropriate. The case conversion of towupper is locale-specific. Only the characters relevant to the current locale are changed in case. The functions without the _l suffix use the currently set locale. The versions of these functions with the _l suffix take the locale as a parameter and use that instead of the currently set locale. For more information, see Locale.
_UNICODE & _MBCS not defined
_toupper_l and _towupper_l have no locale dependence and are not meant to be called directly. They are provided for internal use by _totupper_l.
<ctype.h> or <wchar.h>
For additional compatibility information, see Compatibility in the Introduction.