NAME
towctrans(), wctrans() — character transliteration
SYNOPSIS
#include <wctype.h>
wint_t towctrans(wint_t wc, wctrans_t desc);
wctrans_t wctrans(const char *charclass);
DESCRIPTION
- towctrans()
The
towctrans()
function transliterates the wide-character code
wc
using the mapping described by
desc.
The current setting of the
LC_CTYPE
category should be the same as during the call to
wctrans()
that returned the value
desc.
If the value of
desc
is invalidated (that is, not obtained by a call to
wctrans()
or
desc
is invalidated by a subsequent call to
setlocale()
that has affected category
LC_CTYPE,
the result is undefined.
- wctrans()
The
wctrans()
function is defined for valid character mapping names identified
in the current locale.
The
charclass
is a string identifying a generic character mapping name
for which codeset-specific information is required.
The following character mapping names are defined in all locales
- "tolower" and "toupper".
The function returns a value of type
wctrans_t,
which can be used as the second argument to subsequent calls of
towctrans().
The
wctrans()
function determines values of
wctrans_t
according to the rules of
the coded character set defined by character mapping information
in the program's locale (category
LC_CTYPE).
The values returned by
wctrans()
are valid until a call to
setlocale()
that modifies the category
LC_CTYPE.
APPLICATION USAGE
The strings "tolower" and "toupper" are reserved for the standard mapping
names.
In the table below, the functions in the left column are equivalent to
the functions in the right column.
- towlower(wc)
towctrans(wc, wctrans("tolower"))
- towupper(wc)
towctrans(wc, wctrans("toupper"))
The prototypes of these functions are available to applications
if they are:
- a.
c99
conformant.
- b.
Compiled with
-D_XOPEN_SOURCE
macro with a value >=500.
- c.
Compiled with
-D_POSIX_C_SOURCE
macro with a value >= 200112.
RETURN VALUE
If successful, the
towctrans()
function returns the mapped value of
wc
using the mapping described by
desc.
Otherwise it returns
wc
unchanged.
The
wctrans()
function returns (wchar_t)0 if the given character mapping name is not valid
for the current locale (category
LC_CTYPE),
otherwise it returns a non-zero object of type
wctrans_t
that can be used in calls to
towctrans().
ERRORS
The
towctrans()
function may fail if:
- EINVAL
desc
contains an invalid transliteration descriptor.
The
wctrans()
function may fail if:
- EINVAL
The character mapping name pointed to by
charclass
is not valid in the current locale.
AUTHOR
towctrans(),
wctrans()
were developed by HP and Mitsubishi Electric Corporation.
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