MBTOWC (3)
convert a multibyte sequence to a wide character
SYNOPSIS
#include <stdlib.h>
int mbtowc (wchar_t * pwc , const char * s , size_t n );
DESCRIPTION
The main case for this function is when s is not NULL and pwc is
not NULL. In this case, the mbtowc function inspects at most n
bytes of the multibyte string starting at s, extracts the next complete
multibyte character, converts it to a wide character and stores it at
*pwc. It updates an internal shift state only known to the mbtowc
function. It s does not point to a '\\0' byte, it returns the number
of bytes that were consumed from s, otherwise it returns 0.
If the n bytes starting at s do not contain a complete multibyte
character, or if they contain an invalid multibyte sequence, mbtowc
returns -1. This can happen even if n >= MB_CUR_MAX,
if the multibyte string contains redundant shift sequences.
A different case is when s is not NULL but pwc is NULL. In this
case the mbtowc function behaves as above, excepts that it does not
store the converted wide character in memory.
A third case is when s is NULL. In this case, pwc and n are
ignored. The mbtowc function
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