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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ATTRIBUTES | STANDARDS | HISTORY | NOTES | SEE ALSO | COLOPHON |
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mbsrtowcs(3) Library Functions Manual mbsrtowcs(3)
mbsrtowcs - convert a multibyte string to a wide-character string
(restartable)
Standard C library (libc, -lc)
#include <wchar.h>
size_t mbsrtowcs(wchar_t dest[restrict .dsize],
const char **restrict src,
size_t dsize, mbstate_t *restrict ps);
If dest is not NULL, convert the multibyte string *src to a wide-
character string starting at dest. At most dsize wide characters
are written to dest. The shift state *ps is updated. The
conversion is effectively performed by repeatedly calling
mbrtowc(dest, *src, n, ps) where n is some positive number, as
long as this call succeeds, and then incrementing dest by one and
*src by the number of bytes consumed. The conversion can stop
for three reasons:
• An invalid multibyte sequence has been encountered. In this
case, *src is left pointing to the invalid multibyte sequence,
(size_t) -1 is returned, and errno is set to EILSEQ.
• dsize non-L'\0' wide characters have been stored at dest. In
this case, *src is left pointing to the next multibyte
sequence to be converted, and the number of wide characters
written to dest is returned.
• The multibyte string has been completely converted, including
the terminating null wide character ('\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 wide characters
written to dest, excluding the terminating null wide
character, is returned.
If dest is NULL, dsize is ignored, and the conversion proceeds as
above, except that the converted wide characters 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 mbsrtowcs() function is used instead.
In order to avoid the case 2 above, the programmer should make
sure dsize is greater than or equal to
mbsrtowcs(NULL,src,0,ps)+1.
The programmer must ensure that there is room for at least dsize
wide characters at dest.
This function is a restartable version of mbstowcs(3).
The number of wide characters that make up the converted part of
the wide-character string, not including the terminating null
wide character. If an invalid multibyte sequence was
encountered, (size_t) -1 is returned, and errno set to EILSEQ.
For an explanation of the terms used in this section, see
attributes(7).
┌─────────────┬───────────────┬─────────────────────────────────┐
│ Interface │ Attribute │ Value │
├─────────────┼───────────────┼─────────────────────────────────┤
│ mbsrtowcs() │ Thread safety │ MT-Unsafe race:mbsrtowcs/!ps │
└─────────────┴───────────────┴─────────────────────────────────┘
C11, POSIX.1-2008.
POSIX.1-2001, C99.
The behavior of mbsrtowcs() depends on the LC_CTYPE category of
the current locale.
Passing NULL as ps is not multithread safe.
iconv(3), mbrtowc(3), mbsinit(3), mbsnrtowcs(3), mbstowcs(3)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
This page was obtained from the tarball man-pages-6.9.1.tar.gz
fetched from
⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2024-06-26. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
to-date source for the page, or you have corrections or
improvements to the information in this COLOPHON (which is not
part of the original manual page), send a mail to
man-pages@man7.org
Linux man-pages 6.9.1 2024-06-15 mbsrtowcs(3)
Pages that refer to this page: mbrtowc(3), mbsinit(3), mbsnrtowcs(3), mbstate_t(3type), mbstowcs(3), unicode(7), utf-8(7)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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