The Open Group Base Specifications Issue 7
IEEE Std 1003.1-2008, 2016 Edition
Copyright © 2001-2016 The IEEE and The Open Group

#### NAME

> wctrans, wctrans_l - define character mapping

#### SYNOPSIS

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

> ``[CX] wctrans_t wctrans_l(const char *`charclass`, locale_t` locale`);``
> `
> `

#### DESCRIPTION

> For wctrans(): [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 POSIX.1-2008 defers to the ISO C standard.

> The wctrans() [CX] and wctrans_l() functions are 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.

> These functions shall return a value of type wctrans_t, which can be used as the second argument to subsequent calls of towctrans() [CX] and towctrans_l().

> The wctrans() [CX] and wctrans_l() functions shall determine values of wctrans_t according to the rules of the coded character set defined by character mapping information in the current locale [CX] or in the locale represented by locale, respectively (category LC_CTYPE).

> The values returned by wctrans() shall be valid until a call to setlocale() that modifies the category LC_CTYPE.

> [CX] The values returned by wctrans_l() shall be valid only in calls to towctrans_l() with a locale represented by locale with the same LC_CTYPE category value.

> The behavior is undefined if the locale argument to wctrans_l() is the special locale object LC_GLOBAL_LOCALE or is not a valid locale object handle.

#### RETURN VALUE

> The wctrans() [CX] and wctrans_l() functions shall return 0 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, they shall return a non-zero object of type wctrans_t that can be used in calls to towctrans() [CX] and towctrans_l().

#### ERRORS

> These functions 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

> XBD <wctype.h>

#### CHANGE HISTORY

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

#### Issue 7

> The wctrans_l() function is added from The Open Group Technical Standard, 2006, Extended API Set Part 4.

> POSIX.1-2008, Technical Corrigendum 1, XSH/TC1-2008/0732 [302], XSH/TC1-2008/0733 [289], XSH/TC1-2008/0734 [283], and XSH/TC1-2008/0735 [283] are applied.

End of informative text.

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