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mbsrtowcs(3) [xfree86 man page]

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

NAME
mbsrtowcs - convert a multibyte string to a wide-character string SYNOPSIS
#include <wchar.h> size_t mbsrtowcs(wchar_t *dest, const char **src, size_t len, mbstate_t *ps); DESCRIPTION
If dest is not NULL, the mbsrtowcs() function converts the multibyte string *src to a wide-character string starting at dest. At most len wide characters are written to dest. The shift state *ps is updated. The conversion is effectively performed by repeatedly calling mbr- towc(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: 1. 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. 2. len non-L'' wide characters have been stored at dest. In this case, *src is left pointing to the next multibyte sequence to be con- verted, and the number of wide characters written to dest is returned. 3. The multibyte string has been completely converted, including the terminating null wide character (''), 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, len 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. The programmer must ensure that there is room for at least len wide characters at dest. RETURN VALUE
The mbsrtowcs() function returns 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. ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7). +------------+---------------+------------------------------+ |Interface | Attribute | Value | +------------+---------------+------------------------------+ |mbsrtowcs() | Thread safety | MT-Unsafe race:mbsrtowcs/!ps | +------------+---------------+------------------------------+ CONFORMING TO
POSIX.1-2001, POSIX.1-2008, C99. NOTES
The behavior of mbsrtowcs() depends on the LC_CTYPE category of the current locale. Passing NULL as ps is not multithread safe. SEE ALSO
iconv(3), mbrtowc(3), mbsinit(3), mbsnrtowcs(3), mbstowcs(3) COLOPHON
This page is part of release 4.15 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 https://www.kernel.org/doc/man-pages/. GNU
2017-09-15 MBSRTOWCS(3)

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

NAME
mbsrtowcs - convert a multibyte string to a wide character string SYNOPSIS
#include <wchar.h> size_t mbsrtowcs(wchar_t *dest, const char **src, size_t len, mbstate_t *ps); DESCRIPTION
If dest is not a NULL pointer, the mbsrtowcs function converts the multibyte string *src to a wide-character string starting at dest. At most len 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: 1. 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. 2. len non-L'' wide characters have been stored at dest. In this case *src is left pointing to the next multibyte sequence to be con- verted, and the number of wide characters written to dest is returned. 3. The multibyte string has been completely converted, including the terminating '' (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 L'' character, is returned. If dest is NULL, len 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 a NULL pointer, a static anonymous state only known to the mbsrtowcs function is used instead. The programmer must ensure that there is room for at least len wide characters at dest. RETURN VALUE
The mbsrtowcs function returns 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. CONFORMING TO
ISO/ANSI C, UNIX98 SEE ALSO
mbstowcs(3), mbsnrtowcs(3), iconv(3) NOTES
The behaviour of mbsrtowcs depends on the LC_CTYPE category of the current locale. Passing NULL as ps is not multi-thread safe. GNU
1999-07-25 MBSRTOWCS(3)

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