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

> wctrans - define character mapping

#### SYNOPSIS

> ``#include <wctype.h>
> wctrans_t wctrans(const char *`charclass`);
> ``

#### 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 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 shall return a value of type wctrans_t, which can be used as the second argument to subsequent calls of towctrans(). The wctrans() function shall determine 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() shall be valid until a call to setlocale() that modifies the category LC_CTYPE .

#### RETURN VALUE

> The wctrans() function shall return 0 [CX] and may set errno to indicate the error if the given character mapping name is not valid for the current locale (category LC_CTYPE ); otherwise, it shall return a non-zero object of type wctrans_t that can be used in calls to towctrans().

#### ERRORS

> The wctrans() function may fail if:

> [EINVAL]
>   [CX] The character mapping name pointed to by charclass is not valid in the current locale.

The following sections are informative.

#### EXAMPLES

> None.

#### APPLICATION USAGE

> None.

#### RATIONALE

> None.

#### FUTURE DIRECTIONS

> None.

#### SEE ALSO

> towctrans(), 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).

End of informative text.

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