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TOWCTRANS(3P) POSIX Programmer's Manual TOWCTRANS(3P)
This manual page is part of the POSIX Programmer's Manual. The Linux
implementation of this interface may differ (consult the
corresponding Linux manual page for details of Linux behavior), or
the interface may not be implemented on Linux.
towctrans, towctrans_l — wide-character transliteration
#include <wctype.h>
wint_t towctrans(wint_t wc, wctrans_t desc);
wint_t towctrans_l(wint_t wc, wctrans_t desc,
locale_t locale);
For towctrans(): 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 towctrans() and towctrans_l() functions shall transliterate the
wide-character code wc using the mapping described by desc.
The current setting of the LC_CTYPE category in the current locale or
in the locale represented by locale, respectively, should be the same
as during the call to wctrans() or wctrans_l() that returned the
value desc.
If the value of desc is invalid (that is, not obtained by a call to
wctrans() or desc is invalidated by a subsequent call to setlocale()
that has affected category LC_CTYPE), the result is unspecified.
If the value of desc is invalid (that is, not obtained by a call to
wctrans_l() with the same locale object locale) the result is
unspecified.
An application wishing to check for error situations should set errno
to 0 before calling towctrans() or towctrans_l().
If errno is non-zero on return, an error has occurred.
The behavior is undefined if the locale argument to towctrans_l() is
the special locale object LC_GLOBAL_LOCALE or is not a valid locale
object handle.
If successful, the towctrans() and towctrans_l() functions shall
return the mapped value of wc using the mapping described by desc.
Otherwise, they shall return wc unchanged.
These functions may fail if:
EINVAL desc contains an invalid transliteration descriptor.
The following sections are informative.
None.
The strings "tolower" and "toupper" are reserved for the standard
mapping names. In the table below, the functions in the left column
are equivalent to the functions in the right column.
towlower(wc) towctrans(wc, wctrans("tolower"))
towlower_l(wc, locale) towctrans_l(wc, wctrans("tolower"), locale)
towupper(wc) towctrans(wc, wctrans("toupper"))
towupper_l(wc, locale) towctrans_l(wc, wctrans("toupper"), locale)
None.
None.
towlower(3p), towupper(3p), wctrans(3p)
The Base Definitions volume of POSIX.1‐2008, wctype.h(0p)
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2013 Edition, Standard for Information
Technology -- Portable Operating System Interface (POSIX), The Open
Group Base Specifications Issue 7, Copyright (C) 2013 by the
Institute of Electrical and Electronics Engineers, Inc and The Open
Group. (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1
applied.) 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 original
Standard can be obtained online at http://www.unix.org/online.html .
Any typographical or formatting errors that appear in this page are
most likely to have been introduced during the conversion of the
source files to man page format. To report such errors, see
https://www.kernel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group 2013 TOWCTRANS(3P)
Pages that refer to this page: wctype.h(0p), wctrans(3p)