Linux 2.6 - man page for wctrans (linux section 3posix)
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WCTRANS(P) POSIX Programmer's Manual WCTRANS(P)
wctrans - define character mapping
wctrans_t wctrans(const char *charclass);
The wctrans() function is defined for valid character mapping names identified in the cur-
rent 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 argu-
ment to subsequent calls of towctrans(). 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() that modifies the category LC_CTYPE .
The wctrans() function 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, it shall return a non-zero object of type wctrans_t that can be used in calls
The wctrans() function may fail if:
EINVAL The character mapping name pointed to by charclass is not valid in the current
The following sections are informative.
towctrans() , the Base Definitions volume of IEEE Std 1003.1-2001, <wctype.h>
Portions of this text are reprinted and reproduced in electronic form from IEEE Std
1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating System
Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by
the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the
event of any discrepancy between this version and the original IEEE and The Open Group
Standard, the original IEEE and The Open Group Standard is the referee document. The orig-
inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .
IEEE/The Open Group 2003 WCTRANS(P)
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