wcsrtombs(3p) — Linux manual page


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

       wcsnrtombs, wcsrtombs — convert a wide-character string to a
       character string (restartable)

SYNOPSIS         top

       #include <wchar.h>

       size_t wcsnrtombs(char *restrict dst, const wchar_t **restrict src,
           size_t nwc, size_t len, mbstate_t *restrict ps);
       size_t wcsrtombs(char *restrict dst, const wchar_t **restrict src,
           size_t len, mbstate_t *restrict ps);

DESCRIPTION         top

       For wcsrtombs(): 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 wcsrtombs() function shall convert a sequence of wide characters
       from the array indirectly pointed to by src into a sequence of
       corresponding characters, beginning in the conversion state described
       by the object pointed to by ps.  If dst is not a null pointer, the
       converted characters shall then be stored into the array pointed to
       by dst.  Conversion continues up to and including a terminating null
       wide character, which shall also be stored. Conversion shall stop
       earlier in the following cases:

        *  When a code is reached that does not correspond to a valid

        *  When the next character would exceed the limit of len total bytes
           to be stored in the array pointed to by dst (and dst is not a
           null pointer)

       Each conversion shall take place as if by a call to the wcrtomb()

       If dst is not a null pointer, the pointer object pointed to by src
       shall be assigned either a null pointer (if conversion stopped due to
       reaching a terminating null wide character) or the address just past
       the last wide character converted (if any). If conversion stopped due
       to reaching a terminating null wide character, the resulting state
       described shall be the initial conversion state.

       If ps is a null pointer, the wcsrtombs() function shall use its own
       internal mbstate_t object, which is initialized at program start-up
       to the initial conversion state. Otherwise, the mbstate_t object
       pointed to by ps shall be used to completely describe the current
       conversion state of the associated character sequence.

       The wcsnrtombs() and wcsrtombs() functions need not be thread-safe if
       called with a NULL ps argument.

       The wcsnrtombs() function shall be equivalent to the wcsrtombs()
       function, except that the conversion is limited to the first nwc wide

       The wcsrtombs() function shall not change the setting of errno if

       The behavior of these functions shall be affected by the LC_CTYPE
       category of the current locale.

       The implementation shall behave as if no function defined in System
       Interfaces volume of POSIX.1‐2008 calls these functions.

RETURN VALUE         top

       If conversion stops because a code is reached that does not
       correspond to a valid character, an encoding error occurs. In this
       case, these functions shall store the value of the macro [EILSEQ] in
       errno and return (size_t)−1; the conversion state is undefined.
       Otherwise, these functions shall return the number of bytes in the
       resulting character sequence, not including the terminating null (if

ERRORS         top

       These functions shall fail if:

       EILSEQ A wide-character code does not correspond to a valid

       These functions may fail if:

       EINVAL ps points to an object that contains an invalid conversion

       The following sections are informative.

EXAMPLES         top




RATIONALE         top




SEE ALSO         top

       mbsinit(3p), wcrtomb(3p)

       The Base Definitions volume of POSIX.1‐2008, wchar.h(0p)

COPYRIGHT         top

       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                       WCSRTOMBS(3P)

Pages that refer to this page: wchar.h(0p)mbsinit(3p)wcrtomb(3p)wcsnrtombs(3p)