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mbrlen(3c)
mbrlen(3C) Standard C Library Functions 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 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 as‐
sociated character sequence. Solaris will behave as if no function de‐
fined 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(7).
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 imple‐
mentations 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 er‐
rno 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(7) for descriptions of the following attributes:
tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
TRIBUTE VALUE _ Interface StabilityCommitted _ MT-LevelSee below _
StandardSee standards(7).
MT-Level
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 lo‐
cale. If ps is a null pointer, mbrlen() uses its internal mbstate_t ob‐
ject and the function is Unsafe in multithreaded applications.
SEE ALSO
mbrtowc(3C), mbsinit(3C), setlocale(3C), attributes(7), environ(7),
standards(7)
Handling Characters and Character Strings in Internationalizing and Lo‐
calizing Applications in Oracle Solaris
HISTORY
The mbrlen() function was added to Solaris in the Solaris 7 release.
Oracle Solaris 11.4 25 Nov 2024 mbrlen(3C)