NAME
towctrans,
towctrans_l, wctrans,
wctrans_l —
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);
#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
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.
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 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
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.