mbsnrtowcs(3p) — Linux manual page


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

       mbsnrtowcs, mbsrtowcs — convert a character string to a wide-
       character string (restartable)

SYNOPSIS         top

       #include <wchar.h>

       size_t mbsnrtowcs(wchar_t *restrict dst, const char **restrict src,
           size_t nmc, size_t len, mbstate_t *restrict ps);
       size_t mbsrtowcs(wchar_t *restrict dst, const char **restrict src,
           size_t len, mbstate_t *restrict ps);

DESCRIPTION         top

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

        *  A sequence of bytes is encountered that does not form a valid

        *  len codes have been stored into 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 mbrtowc()

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

       If ps is a null pointer, the mbsrtowcs() 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 mbsnrtowcs() function shall be equivalent to the mbsrtowcs()
       function, except that the conversion of characters pointed to by src
       is limited to at most nmc bytes (the size of the input buffer).

       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 this
       volume of POSIX.1‐2008 calls these functions.

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

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

RETURN VALUE         top

       If the input conversion encounters a sequence of bytes that do not
       form a valid character, an encoding error occurs. In this case, these
       functions shall store the value of the macro [EILSEQ] in errno and
       shall return (size_t)−1; the conversion state is undefined.
       Otherwise, these functions shall return the number of characters
       successfully converted, not including the terminating null (if any).

ERRORS         top

       These functions shall fail if:

       EILSEQ An invalid character sequence is detected.

       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

       iconv(3p), mbrtowc(3p), mbsinit(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                       MBSRTOWCS(3P)