The Open Group Base Specifications Issue 6
IEEE Std 1003.1, 2004 Edition
Copyright © 2001-2004 The IEEE and The Open Group, All Rights reserved.

#### NAME

> towctrans - wide-character transliteration

#### SYNOPSIS

> ``#include <wctype.h>
> wint_t towctrans(wint_t` wc`, wctrans_t` desc`);
> ``

#### DESCRIPTION

> [CX] The functionality described on this reference page is aligned with the ISO C standard. Any conflict between the requirements described here and the ISO C standard is unintentional. This volume of IEEE Std 1003.1-2001 defers to the ISO C standard.

> The towctrans() function shall transliterate 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. [CX] If the value of desc is invalid (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 unspecified.

> An application wishing to check for error situations should set errno to 0 before calling towctrans(). If errno is non-zero on return, an error has occurred.

#### RETURN VALUE

> If successful, the towctrans() function shall return the mapped value of wc using the mapping described by desc. Otherwise, it shall return wc unchanged.

#### ERRORS

> The towctrans() function may fail if:

> [EINVAL]
>   [CX] desc contains an invalid transliteration descriptor.

The following sections are informative.

#### EXAMPLES

> None.

#### 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"))

#### RATIONALE

> None.

#### FUTURE DIRECTIONS

> None.

#### SEE ALSO

> towlower(), towupper(), wctrans(), the Base Definitions volume of IEEE Std 1003.1-2001, <wctype.h>

#### CHANGE HISTORY

> First released in Issue 5. Derived from ISO/IEC 9899:1990/Amendment 1:1995 (E).

#### Issue 6

> Extensions beyond the ISO C standard are marked.

End of informative text.

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