MBTOWC(3)

NAME
mbtowc, mbtowc_l - convert a character to a wide-character code

LIBRARY
libc

SYNOPSIS
#include <stdlib.h>
int
mbtowc(wchar_t *restrict pwc, const char *restrict s, size_t n);
#include <stdlib.h>
#include <xlocale.h>
int
mbtowc_l(wchar_t *restrict pwc, const char *restrict s, size_t n, locale_t loc);

DESCRIPTION
The mbtowc() function converts a multibyte character s into a wide character, according to the current conversion state, and stores the result in the object pointed to by pwc. Up to n bytes are examined.

A call with a null s pointer returns nonzero if the current encoding requires shift states, zero otherwise; if shift states are required, the shift state is reset to the initial state.

While the mbtowc() function uses the current locale, the mbtowc_l() function may be passed a locale directly. See xlocale(3) for more information.

RETURN VALUES
If s is NULL, the mbtowc() function returns nonzero if shift states are supported, zero otherwise.

Otherwise, if s is not a null pointer, mbtowc() either returns 0 if s represents the null wide character, or returns the number of bytes processed in s, or returns -1 if no multibyte character could be recognized or converted. In this case, mbtowc()'s internal conversion state is undefined.

ERRORS
The mbtowc() function will fail if:

[EILSEQ]
    An invalid multibyte sequence was detected.

[EINVAL]
    The internal conversion state is invalid.

SEE ALSO
btowc(3), mblen(3), mbrtowc(3), mbstowcs(3), multibyte(3), wctomb(3), xlocale(3)

STANDARDS
The mbtowc() function conforms to isoC-99.