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Man Pages
WCTRANS(3) FreeBSD Library Functions Manual WCTRANS(3)

towctrans, wctrans
wide character mapping functions

Standard C Library (libc, -lc)

#include <wctype.h>

wint_t
towctrans(wint_t wc, wctrans_t desc);

wctrans_t
wctrans(const char *charclass);

The wctrans() function returns a value of type wctrans_t which represents the requested wide character mapping operation and may be used as the second argument for calls to towctrans().

The following character mapping names are recognised:

toupper

The towctrans() function transliterates the wide character wc according to the mapping described by desc.

The towctrans() function returns the transliterated character if successful, otherwise it returns the character unchanged and sets errno.

The wctrans() function returns non-zero if successful, otherwise it returns zero and sets errno.

Reimplement towupper() in terms of towctrans() and wctrans():
wint_t
mytowupper(wint_t wc)
{
	return (towctrans(wc, wctrans("toupper")));
}

The towctrans() function will fail if:
[]
The supplied desc argument is invalid.

The wctrans() function will fail if:

[]
The requested mapping name is invalid.

tolower(3), toupper(3), wctype(3)

The towctrans() and wctrans() functions conform to IEEE Std 1003.1-2001 (“POSIX.1”).

The towctrans() and wctrans() functions first appeared in FreeBSD 5.0.
October 3, 2002 FreeBSD 13.1-RELEASE

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