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Technical Reference: Base Operating System and Extensions, Volume 2

wctrans Subroutine


Define character mapping.


Standard library (libc.a)


#include <wctype.h>

wctrans_t wctrans (const char * charclass);


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 Values

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.

Error Codes

The wctrans function may fail if:

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

Related Information

The towctrans (towctrans Subroutine) subroutine.

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