wcstombs(3p) — Linux manual page


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

       wcstombs — convert a wide-character string to a character string

SYNOPSIS         top

       #include <stdlib.h>

       size_t wcstombs(char *restrict s, const wchar_t *restrict pwcs,
           size_t n);

DESCRIPTION         top

       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 standard.

       The wcstombs() function shall convert the sequence of wide-
       character codes that are in the array pointed to by pwcs into a
       sequence of characters that begins in the initial shift state and
       store these characters into the array pointed to by s, stopping
       if a character would exceed the limit of n total bytes or if a
       null byte is stored. Each wide-character code shall be converted
       as if by a call to wctomb(), except that the shift state of
       wctomb() shall not be affected.

       The behavior of this function shall be affected by the LC_CTYPE
       category of the current locale.

       No more than n bytes shall be modified in the array pointed to by
       s.  If copying takes place between objects that overlap, the
       behavior is undefined.  If s is a null pointer, wcstombs() shall
       return the length required to convert the entire array regardless
       of the value of n, but no values are stored.

RETURN VALUE         top

       If a wide-character code is encountered that does not correspond
       to a valid character (of one or more bytes each), wcstombs()
       shall return (size_t)-1. Otherwise, wcstombs() shall return the
       number of bytes stored in the character array, not including any
       terminating null byte. The array shall not be null-terminated if
       the value returned is n.

ERRORS         top

       The wcstombs() function shall fail if:

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

       The following sections are informative.

EXAMPLES         top




RATIONALE         top




SEE ALSO         top

       mblen(3p), mbtowc(3p), mbstowcs(3p), wctomb(3p)

       The Base Definitions volume of POSIX.1‐2017, stdlib.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 http://www.opengroup.org/unix/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               2017                      WCSTOMBS(3P)

Pages that refer to this page: ctype.h(0p)stdlib.h(0p)mblen(3p)mbstowcs(3p)mbtowc(3p)setlocale(3p)wctomb(3p)