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#if 0
#include <stdlib.h>
/** convert multibyte string to wide character string **/
errno_t mbstowcs_s(size_t * restrict retval, wchar_t * restrict dst, rsize_t dstmax, const char * restrict src, rsize_t len)
{
__C_EXT(1, 201112L);
}
/***
The fn(mbstowcs) function converts the string of multibyte characters arg(s)
to a string of wide characters, which are stored at arg(pwcs). No more than
arg(n) wide characters are stored at arg(pwcs). No further characters will
be converted after a null character, which is converted.
***/
/* UNSPECIFIED: - */
/* UNDEFINED: the memory regions of arg(s) and arg(pwcs) overlap */
/* IMPLEMENTATION: - */
/* LOCALE: LC_CTYPE */
/* RETURN(-1): an invalid multibyte character was encountered */
/* RETURN: the number of wide characters converted, not counting any terminating zero */
/*
CEXT1(201112)
*/
#endif
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