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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ATTRIBUTES | STANDARDS | HISTORY | NOTES | SEE ALSO | COLOPHON |
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wcsrtombs(3) Library Functions Manual wcsrtombs(3)
wcsrtombs - convert a wide-character string to a multibyte string
Standard C library (libc, -lc)
#include <wchar.h>
size_t wcsrtombs(char dest[restrict .len], const wchar_t **restrict src,
size_t len, mbstate_t *restrict ps);
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:
• 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.
• 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.
• 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.
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.
For an explanation of the terms used in this section, see
attributes(7).
┌─────────────┬───────────────┬─────────────────────────────────┐
│ Interface │ Attribute │ Value │
├─────────────┼───────────────┼─────────────────────────────────┤
│ wcsrtombs() │ Thread safety │ MT-Unsafe race:wcsrtombs/!ps │
└─────────────┴───────────────┴─────────────────────────────────┘
C11, POSIX.1-2008.
POSIX.1-2001, C99.
The behavior of wcsrtombs() depends on the LC_CTYPE category of
the current locale.
Passing NULL as ps is not multithread safe.
iconv(3), mbsinit(3), wcrtomb(3), wcsnrtombs(3), wcstombs(3)
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user-space interface documentation) project. Information about
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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-
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Linux man-pages 6.9.1 2024-06-15 wcsrtombs(3)
Pages that refer to this page: mbsinit(3), mbstate_t(3type), wcrtomb(3), wcsnrtombs(3), wcstombs(3)
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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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