towlower, towupper - Convert uppercase and lowercase wide characters
Standard C Library (libc.so, libc.a)
wint_t towlower (
wint_t towupper (
The XPG4 and XPG4-UNIX standards specify #include <wchar.h> in place of #include <wctype.h>, which is currently specified by the ISO C standard. Both #include statements are supported.
Interfaces documented on this reference page conform to industry standards as follows:
towlower(), towupper(): ISO C, XPG4
Refer to the standards(5) reference page for more information about industry standards and associated tags.
Specifies the wide character to convert.
The towlower() function converts the uppercase wide character specified by the wc parameter into the corresponding lowercase wide character. The towupper() function converts the lowercase wide character specified by the wc parameter into the corresponding uppercase wide character. The behavior of the towlower() and towupper() functions are affected by the LC_CTYPE category of the program's locale.
[Digital] In a locale where case conversion information is not defined, these functions determine the case of characters according to the rules of the C locale.
In the towlower() function, if the wc parameter contains an uppercase wide character that has a corresponding lowercase wide character, that wide character is returned. Otherwise, the wc parameter is returned unchanged.
In the towupper() function, if the wc parameter contains a lowercase wide character that has a corresponding uppercase wide character, that wide character is returned. Otherwise, the wc parameter is returned unchanged.
Functions: conv(3), setlocale(3), towctrans(3), wctrans(3)
Standards: standards(5) delim off