huschi.net

TOWCTRANS(3P)              POSIX Programmer's Manual             TOWCTRANS(3P)
PROLOG
       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.
NAME
       towctrans, towctrans_l -- wide-character transliteration
SYNOPSIS
       #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);
DESCRIPTION
       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  unspeci-
       fied.
       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.
RETURN VALUE
       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.
ERRORS
       These functions may fail if:
       EINVAL desc contains an invalid transliteration descriptor.
       The following sections are informative.
EXAMPLES
       None.
APPLICATION USAGE
       The strings "tolower" and "toupper" are reserved for the standard  map-
       ping  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)
RATIONALE
       None.
FUTURE DIRECTIONS
       None.
SEE ALSO
       towlower(), towupper(), wctrans()
       The Base Definitions volume of POSIX.1-2008, <wctype.h>
COPYRIGHT
       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 Electri-
       cal 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.ker-
       nel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group                  2013                        TOWCTRANS(3P)