NAME
towctrans, wctrans
— wide character mapping
functions
LIBRARY
library “libc”
SYNOPSIS
#include
<wctype.h>
wint_t
towctrans(wint_t
wc, wctrans_t
desc);
wctrans_t
wctrans(const
char *charclass);
DESCRIPTION
Thewctrans()
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
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.