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MBRTOWC (3) | C library functions | Unix Manual Pages | :man

NAME

mbrtowc - "convert a character to a wide-character code (restartable)"

CONTENTS

Library
Synopsis
Description
Return Values
Errors
See Also
Standards

LIBRARY


.Lb libc

SYNOPSIS


.In wchar.h size_t
.Fo mbrtowc "wchar_t * restrict pwc" "const char * restrict s" "size_t n" "mbstate_t * restrict ps"
.Fc

DESCRIPTION

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
.Vt wchar_t it points to.

If s is NULL, mbrtowc behaves as if pwc was NULL, s was an empty string ("") and n was 1.

The
.Vt mbstate_t argument, ps, is used to keep track of the shift state. If it is NULL, mbrtowc uses an internal, static
.Vt mbstate_t object, which is initialized to the initial conversion state at program startup.

RETURN VALUES

The mbrtowc functions returns:
0 The next n or fewer bytes represent the null wide character ("L’\0’").
>0 The next n or fewer bytes represent a valid character, mbrtowc returns the number of bytes used to complete the multibyte character.
(Vt size_t-2)
The next n contribute to, but do not complete, a valid multibyte character sequence, and all n bytes have been processed.
(Vt size_t-1)
An encoding error has occurred. The next n or fewer bytes do not contribute to a valid multibyte character.

ERRORS

The mbrtowc function will fail if:
[EILSEQ]
An invalid multibyte sequence was detected.
[EINVAL]
The conversion state is invalid.

SEE ALSO

mbtowc(3), multibyte(3), setlocale(3), wcrtomb(3)

STANDARDS


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