MBRLEN(3C)MBRLEN(3C)NAMEmbrlen - 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 initialized at program startup to the ini‐
tial 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. Solaris will behave as if no function
defined in the Solaris Reference Manual calls mbrlen().
The behavior of this function is affected by the LC_CTYPE category of
the current locale. See environ(5).
RETURN VALUES
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 charac‐
ter; 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 contribute 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:
EINVAL
The ps argument points to an object that contains an invalid
conversion state.
EILSEQ
Invalid character sequence is detected.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌────────────────────┬─────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├────────────────────┼─────────────────┤
│Interface Stability │ Standard │
├────────────────────┼─────────────────┤
│MT-Level │ See NOTES below │
└────────────────────┴─────────────────┘
SEE ALSOmbrtowc(3C), mbsinit(3C), setlocale(3C), attributes(5), environ(5),
standards(5)NOTES
If ps is not a null pointer, mbrlen() uses the mbstate_t object pointed
to by ps and the function can be used safely in multithreaded applica‐
tions, as long as setlocale(3C) is not being called to change the
locale. If ps is a null pointer, mbrlen() uses its internal mbstate_t
object and the function is Unsafe in multithreaded applications.
Nov 1, 2003 MBRLEN(3C)
