mbrlen.3c (2010 09)

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mbrlen(3C) mbrlen(3C)

NAME

mbrlen( ) - get number of bytes in a character (restartable)

SYNOPSIS

#include <wchar.h>

size_t mbrlen(const char *__restrict s, size_t n, mbstate_t *__restrict

ps);

DESCRIPTION

If s is not a null pointer,

mbrlen() determines the number of bytes constituting the character pointed to

by s. It is equivalent to:

mbstate_t internal;

mbrtowc(NULL, s, n, ps != NULL ? ps : &internal);

If ps is a null pointer, the

mbrlen() function uses its own internal mbstate_t object, which is initial-

ized at program startup to the initial conversion state. Otherwise, the

mbstate_t object pointed to by

ps is used to completely describe the current conversion state of the associated character sequence.

APPLICATION USAGE

The prototype of this function is available to applications if they are:

c99 conformant.

b. Compiled with

-D_XOPEN_SOURCE

macro with a value >=500.

c. Compiled with

-D_POSIX_C_SOURCE

macro with a value >= 200112.

EXTERNAL INFLUENCES

Environment Variables

The behavior of this function is affected by the

LC_CTYPE category of the current locale.

RETURN VALUE

The

mbrlen() function returns the ﬁrst of the following that applies:

0 If the next n or fewer bytes complete the character that corresponds to the null

wide-character.

positive If the next n or fewer bytes complete a valid character; the value returned is the

number of bytes that complete the character.

(size_t )-2 If the next n bytes contribute to an incomplete but potentially valid character, and

all n bytes have been processed. When n has at least the value of the

MB_CUR_MAX

macro, this case can only occur if s points at a sequence of redundant shift

sequences (for implementations with state-dependent encodings).

(size_t )-1 If an encoding error occurs, in which case the next n or fewer bytes do not contri-

bute to a complete and valid character. In this case, [EILSEQ] is stored in

errno

and the conversion state is undeﬁned.

ERRORS

The

mbrlen() function may fail if:

[EILSEQ] Invalid character sequence is detected.

[EINVAL] ps points to an object that contains an invalid conversion state.

AUTHOR

mbrlen() was developed by HP and Mitsubishi Electric Corporation.