Linux 2.6 - man page for wctrans (linux section 3)
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WCTRANS(3) Linux Programmer's Manual WCTRANS(3)
wctrans - wide-character translation mapping
wctrans_t wctrans(const char *name);
The wctrans_t type represents a mapping which can map a wide character to another wide
character. Its nature is implementation-dependent, but the special value (wctrans_t) 0
denotes an invalid mapping. Nonzero wctrans_t values can be passed to the towctrans(3)
function to actually perform the wide-character mapping.
The wctrans() function returns a mapping, given by its name. The set of valid names
depends on the LC_CTYPE category of the current locale, but the following names are valid
in all locales.
"tolower" - realizes the tolower(3) mapping
"toupper" - realizes the toupper(3) mapping
The wctrans() function returns a mapping descriptor if the name is valid. Otherwise it
returns (wctrans_t) 0.
Multithreading (see pthreads(7))
The wctrans() function is thread-safe with exceptions. It can be safely used in multi-
threaded applications, as long as setlocale(3) is not called to change the locale.
The behavior of wctrans() depends on the LC_CTYPE category of the current locale.
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GNU 2013-11-04 WCTRANS(3)
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