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RedHat 9 (Linux i386) - man page for mbsrtowcs (redhat section 3)

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

       mbsrtowcs - convert a multibyte string to a wide character string

       #include <wchar.h>

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

       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 repeat-
       edly 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'\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.

       3.  The	multibyte  string  has	been completely converted, including the terminating '\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 terminat-
       ing L'\0' 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.

       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

       ISO/ANSI C, UNIX98

       mbstowcs(3), mbsnrtowcs(3), iconv(3)

       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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