Character Manipulation Function
int isupper(int c);
int iswupper(wint_t c);
int _ismbcupper(unsigned int c);
int _istupper(_TINT c);
Internationalization (I18n) Function Overview
The function isupper tests for an uppercase
character, using the LC_CTYPE category setting of the current locale.
iswupper is the wide character equivalent of isupper , testing the wide character c .
On Windows platforms only, use _ismbcupper for the multibyte character equivalent.
It returns nonzero if c is an uppercase character within the current multibyte character set.
_istupper is the Windows-only Generic version of the function; with the _MBCS or _UNICODE compiler flags determining its mapping to either _ismbcupper or iswupper .
I18n Issues
Use the appropriate version of the function as required for internationalization support, noting the following:
On ANSI platforms, there is no multibyte version of isupper . Instead, convert the character c to a wide character and
call iswupper .
Prior to calling iswupper on ANSI platforms, ensure that the locale is set correctly, since
the result of the test condition depends on the locale's LC_CTYPE category setting.
On Windows platforms, the iswupper test is independent of locale.
The _ismbcupper function depends on the multibyte code page in effect. By default, the multibyte code page
is set to the system-default ANSI code page obtained from the operating system at program startup.
Use _getmbcp and _setmbcp to query or change
the current multibyte code page, respectively.
Recommended Replacements*
*If you're already using the recommended function, see I18n Issues for other reasons why Globalyzer is detecting the function.
Character Manipulation
Functions
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