wcsrtombs(3) — Linux manual page


WCSRTOMBS(3)              Linux Programmer's Manual             WCSRTOMBS(3)

NAME         top

       wcsrtombs - convert a wide-character string to a multibyte string

SYNOPSIS         top

       #include <wchar.h>

       size_t wcsrtombs(char *dest, const wchar_t **src,
                        size_t len, mbstate_t *ps);

DESCRIPTION         top

       If dest is not NULL, the wcsrtombs() function converts the wide-
       character string *src to a multibyte string starting at dest.  At
       most len bytes are written to dest.  The shift state *ps is updated.
       The conversion is effectively performed by repeatedly calling
       wcrtomb(dest, *src, ps), as long as this call succeeds, and then
       incrementing dest by the number of bytes written and *src by one.
       The conversion can stop for three reasons:

       1. A wide character has been encountered that can not be represented
          as a multibyte sequence (according to the current locale).  In
          this case, *src is left pointing to the invalid wide character,
          (size_t) -1 is returned, and errno is set to EILSEQ.

       2. The length limit forces a stop.  In this case, *src is left
          pointing to the next wide character to be converted, and the
          number of bytes written to dest is returned.

       3. The wide-character string has been completely converted, including
          the terminating null wide character (L'\0'), which has the side
          effect of bringing back *ps to the initial state.  In this case,
          *src is set to NULL, and the number of bytes written to dest,
          excluding the terminating null byte ('\0'), is returned.

       If dest is NULL, len is ignored, and the conversion proceeds as
       above, except that the converted bytes are not written out to memory,
       and that no length limit exists.

       In both of the above cases, if ps is NULL, a static anonymous state
       known only to the wcsrtombs() function is used instead.

       The programmer must ensure that there is room for at least len bytes
       at dest.

RETURN VALUE         top

       The wcsrtombs() function returns the number of bytes that make up the
       converted part of multibyte sequence, not including the terminating
       null byte.  If a wide character was encountered which could not be
       converted, (size_t) -1 is returned, and errno set to EILSEQ.

ATTRIBUTES         top

       For an explanation of the terms used in this section, see

       │Interface   Attribute     Value                        │
       │wcsrtombs() │ Thread safety │ MT-Unsafe race:wcsrtombs/!ps │

CONFORMING TO         top

       POSIX.1-2001, POSIX.1-2008, C99.

NOTES         top

       The behavior of wcsrtombs() depends on the LC_CTYPE category of the
       current locale.

       Passing NULL as ps is not multithread safe.

SEE ALSO         top

       iconv(3), mbsinit(3), wcrtomb(3), wcsnrtombs(3), wcstombs(3)

COLOPHON         top

       This page is part of release 5.07 of the Linux man-pages project.  A
       description of the project, information about reporting bugs, and the
       latest version of this page, can be found at

GNU                              2019-03-06                     WCSRTOMBS(3)

Pages that refer to this page: mbsinit(3)wcrtomb(3)wcsnrtombs(3)wcstombs(3)