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 (“POSIX.1”) 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(3). 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(3) 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(3).
ERRORS
The wctrans () function may fail if:
- [EINVAL]
- [CX] The character mapping name pointed to by charclass is not valid in the current locale.
EXAMPLES
None.
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
towctrans(3), the Base Definitions volume of IEEE Std 1003.1-2001 (“POSIX.1”), <wctype.h>
CHANGE HISTORY
First released in Issue 5. Derived from ISO/IEC 9899/AMD1:1995 (“ISO C90, Amendment 1”) (E).
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