towctrans(3p) — Linux manual page


TOWCTRANS(3P)           POSIX Programmer's Manual          TOWCTRANS(3P)

PROLOG         top

       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         top

       towctrans, towctrans_l — wide-character transliteration

SYNOPSIS         top

       #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         top

       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.1‐2017 defers to the ISO C

       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

       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

       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         top

       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         top

       These functions may fail if:

       EINVAL desc contains an invalid transliteration descriptor.

       The following sections are informative.

EXAMPLES         top



       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)

RATIONALE         top




SEE ALSO         top

       towlower(3p), towupper(3p), wctrans(3p)

       The Base Definitions volume of POSIX.1‐2017, wctype.h(0p)

COPYRIGHT         top

       Portions of this text are reprinted and reproduced in electronic
       form from IEEE Std 1003.1-2017, Standard for Information
       Technology -- Portable Operating System Interface (POSIX), The
       Open Group Base Specifications Issue 7, 2018 Edition, Copyright
       (C) 2018 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 original Standard can be
       obtained online at .

       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 .

IEEE/The Open Group               2017                     TOWCTRANS(3P)

Pages that refer to this page: wctype.h(0p)wctrans(3p)