NAME
mbsrtowcs - convert a multibyte string to a wide-character string SYNOPSIS
#include
sizet mbsrtowcs(wchart *dest, const char **src, sizet len, mbstatet *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, (sizet) -1 is returned, and errno is set to EILSEQ.
2. len non-L'\0' 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 ('\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, len is ignored, and the conversion proceeds as above, except that the converted wide characters are not written out to mem‐ ory, and that no length limit exists. In both of the above cases, if ps is a NULL pointer, 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, (sizet) -1 is returned, and errno set to EILSEQ. CONFORMING TO C99. NOTES The behavior of mbsrtowcs() depends on the LCCTYPE category of the current locale. Passing NULL as ps is not multithread safe. SEE ALSO iconv(3), mbsnrtowcs(3), mbstowcs(3) COLOPHON
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GNU 2011-09-28 MBSRTOWCS(3)