MBRTOWC(3) BSD Library Functions Manual MBRTOWC(3)
mbrtowc, mbrtowc_l -- convert a character to a wide-character code (restartable)
Standard C Library (libc, -lc)
mbrtowc(wchar_t *restrict pwc, const char *restrict s, size_t n, mbstate_t *restrict ps);
mbrtowc_l(wchar_t *restrict pwc, const char *restrict s, size_t n, mbstate_t *restrict ps, locale_t loc);
The mbrtowc() function inspects at most n bytes, pointed to by s, to determine the number of bytes needed to complete the next multibyte
character. If a character can be completed, and pwc is not NULL, the wide character which is represented by s is stored in the wchar_t it
If s is NULL, mbrtowc() behaves as if pwc were NULL, s were an empty string (""), and n were 1.
The mbstate_t argument, ps, is used to keep track of the shift state. If it is NULL, mbrtowc() uses an internal, static mbstate_t object,
which is initialized to the initial conversion state at program startup.
While the mbrtowc() function uses the current locale, the mbrtowc_l() function may be passed a locale directly. See xlocale(3) for more
The mbrtowc() functions returns:
0 The next n or fewer bytes represent the null wide character (L'