NAME

wctrans - define character mapping

 SYNOPSIS

#include <wctype.h>

wctrans_t wctrans(const char *charclass);

 DESCRIPTION

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.

 RETURN VALUE

The wctrans() function returns 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 wctrans() function may fail if:

[EINVAL]

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

 EXAMPLES

None.

 APPLICATION USAGE

None.

 FUTURE DIRECTIONS

None.

 SEE ALSO

towctrans(), <wctype.h>.

DERIVATION

Derived from ISO/IEC 9899:1990/Amendment 1:1995 (E).