MBTOWC(3) BSD Library Functions Manual MBTOWC(3)NAME
mbtowc, mbtowc_l — convert a character to a wide-character code
LIBRARY
Standard C Library (libc, -lc)
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 char‐
acter, 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() func‐
tion may be passed a locale directly. See xlocale(3) for more informa‐
tion.
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 pro‐
cessed 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 ALSObtowc(3), mblen(3), mbrtowc(3), mbstowcs(3), multibyte(3), wctomb(3),
xlocale(3)STANDARDS
The mbtowc() function conforms to ISO/IEC 9899:1999 (“ISO C99”).
BSD April 11, 2004 BSD
