wctrans man page

Prolog

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wctrans, wctrans_l — define character mapping

Synopsis

#include <wctype.h>

wctrans_t wctrans(const char *charclass);
wctrans_t wctrans_l(const char *charclass, locale_t locale);

Description

For wctrans(): 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() 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() and towctrans_l().

The wctrans() 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 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.

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() 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() and towctrans_l().

Errors

These functions may fail if:

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

The following sections are informative.

See Also

towctrans()

The Base Definitions volume of POSIX.1‐2008, <wctype.h>

Info

2013 IEEE/The Open Group POSIX Programmer's Manual