NAME
mbtowc —
convert a character to a wide-character
code
LIBRARY
library “libc”
SYNOPSIS
#include
<stdlib.h>
int
mbtowc(wchar_t * restrict
wcharp, const char * restrict mbchar,
size_t nbytes);
DESCRIPTION
Thembtowc()
function converts a multibyte character mbchar into a
wide character according to the current conversion state, and stores the
result in the object pointed to by wcharp. Up to
nbytes bytes are examined.
A call with a null mbchar 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.
RETURN VALUES
If mbchar is NULL,
the mbtowc() function returns nonzero if shift
states are supported, zero otherwise.
Otherwise, if mbchar is not a null pointer,
mbtowc() either returns 0 if
mbchar represents the null wide character, or returns
the number of bytes processed in mbchar, 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)
STANDARDS
The mbtowc() function conforms to
ISO/IEC 9899:1999
(“ISO C99”).