_strupr, _strupr_l, _mbsupr, _mbsupr_l, _wcsupr_l, _wcsupr

Article
04/28/2015

Converts a string to uppercase. More secure versions of these functions are available; see _strupr_s, _strupr_s_l, _mbsupr_s, _mbsupr_s_l, _wcsupr_s, _wcsupr_s_l.

Important

_mbsupr and _mbsupr_l cannot be used in applications that execute in the Windows Runtime. For more information, see CRT functions not supported with /ZW.

char *_strupr(
   char *str 
);
wchar_t *_wcsupr(
   wchar_t *str 
);
unsigned char *_mbsupr(
   unsigned char *str 
);
char *_strupr_l(
   char *str,
   _locale_t locale
);
wchar_t *_wcsupr_l(
   wchar_t *str,
   _locale_t locale
);
unsigned char *_mbsupr_l(
   unsigned char *str,
   _locale_t locale
);
template <size_t size>
char *_strupr(
   char (&str)[size]
); // C++ only
template <size_t size>
wchar_t *_wcsupr(
   wchar_t (&str)[size]
); // C++ only
template <size_t size>
unsigned char *_mbsupr(
   unsigned char (&str)[size]
); // C++ only
template <size_t size>
char *_strupr_l(
   char (&str)[size],
   _locale_t locale
); // C++ only
template <size_t size>
wchar_t *_wcsupr_l(
   wchar_t (&str)[size],
   _locale_t locale
); // C++ only
template <size_t size>
unsigned char *_mbsupr_l(
   unsigned char (&str)[size],
   _locale_t locale
); // C++ only

Parameters

str
String to capitalize.
locale
The locale to use.

Return Value

Returns a pointer to the altered string. Because the modification is done in place, the pointer returned is the same as the pointer passed as the input argument. No return value is reserved to indicate an error.

Remarks

The _strupr function converts, in place, each lowercase letter in str to uppercase. The conversion is determined by the LC_CTYPE category setting of the locale. Other characters are not affected. For more information on LC_CTYPE, see setlocale. The versions of these functions without the _l suffix use the current locale; the versions with the _l suffix are identical except that they use the locale passed in instead. For more information, see Locale.

_wcsupr and _mbsupr are wide-character and multibyte-character versions of _strupr. The argument and return value of _wcsupr are wide-character strings; those of _mbsupr are multibyte-character strings. These three functions behave identically otherwise.

If str is a null pointer, the invalid parameter handler is invoked, as described in Parameter Validation . If execution is allowed to continue, these functions return the original string and set errno to EINVAL.

In C++, these functions have template overloads that invoke the newer, secure counterparts of these functions. For more information, see Secure Template Overloads.

Generic-Text Routine Mappings

TCHAR.H routine	_UNICODE & _MBCS not defined	_MBCS defined	_UNICODE defined
_tcsupr	_strupr	_mbsupr	_wcsupr
_tcsupr_l	_strupr_l	_mbsupr_l	_wcsupr_l

Requirements

Routine	Required header
_strupr, _strupr_l	<string.h>
_wcsupr, _wcsupr_l	<string.h> or <wchar.h>
_mbsupr, _mbsupr_l	<mbstring.h>

For additional compatibility information, see Compatibility.

Example

See the example for _strlwr.

.NET Framework Equivalent

System::String::ToUpper

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