WCTRANS(3) BSD Library Functions Manual WCTRANS(3)NAME
towctrans, towctrans_l, wctrans, wctrans_l — wide character mapping func‐
tions
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);
#include <wctype.h>
#include <xlocale.h>
wint_t
towctrans_l(wint_t wc, wctrans_t desc, locale_t loc);
wctrans_t
wctrans_l(const char *charclass, locale_t loc);
DESCRIPTION
The wctrans() function returns a value of type wctrans_t, which repre‐
sents 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.
While the towctrans() and wctrans() functions use the current locale, the
towctrans_l() and wctrans_l() functions may be passed locales directly.
See xlocale(3) for more information.
RETURN VALUES
The towctrans() function returns the transliterated character if success‐
ful, 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 ALSOtolower(3), toupper(3), wctype(3), xlocale(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
