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FreeBSD 11.0 - man page for wctrans (freebsd section 3)

WCTRANS(3)						   BSD Library Functions Manual 						WCTRANS(3)

NAME
towctrans, wctrans -- wide character mapping functions
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <wctype.h> wint_t towctrans(wint_t wc, wctrans_t desc); wctrans_t wctrans(const char *charclass);
DESCRIPTION
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: tolower toupper The towctrans() function transliterates the wide character wc according to the mapping described by desc.
RETURN VALUES
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.
EXAMPLES
Reimplement towupper() in terms of towctrans() and wctrans(): wint_t mytowupper(wint_t wc) { return (towctrans(wc, wctrans("toupper"))); }
ERRORS
The towctrans() function will fail if: [EINVAL] The supplied desc argument is invalid. The wctrans() function will fail if: [EINVAL] The requested mapping name is invalid.
SEE ALSO
tolower(3), toupper(3), wctype(3)
STANDARDS
The towctrans() and wctrans() functions conform to IEEE Std 1003.1-2001 (``POSIX.1'').
HISTORY
The towctrans() and wctrans() functions first appeared in FreeBSD 5.0.
BSD
October 3, 2002 BSD

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