This manual page is part of the POSIX Programmer's Manual. The Linux
implementation of this interface may differ (consult the
corresponding Linux manual page for details of Linux behavior), or
the interface may not be implemented on Linux.
The functionality described on this reference page is aligned with
the ISO C standard. Any conflict between the requirements described
here and the ISO C standard is unintentional. This volume of
POSIX.1‐2008 defers to the ISO C standard.
If ps is not a null pointer, the mbsinit() function shall determine
whether the object pointed to by ps describes an initial conversion
The mbsinit() function shall return non-zero if ps is a null pointer,
or if the pointed-to object describes an initial conversion state;
otherwise, it shall return zero.
If an mbstate_t object is altered by any of the functions described
as ``restartable'', and is then used with a different character
sequence, or in the other conversion direction, or with a different
LC_CTYPE category setting than on earlier function calls, the
behavior is undefined.
The mbstate_t object is used to describe the current conversion state
from a particular character sequence to a wide-character sequence (or
vice versa) under the rules of a particular setting of the LC_CTYPE
category of the current locale.
The initial conversion state corresponds, for a conversion in either
direction, to the beginning of a new character sequence in the
initial shift state. A zero valued mbstate_t object is at least one
way to describe an initial conversion state. A zero valued mbstate_t
object can be used to initiate conversion involving any character
sequence, in any LC_CTYPE category setting.
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2013 Edition, Standard for Information
Technology -- Portable Operating System Interface (POSIX), The Open
Group Base Specifications Issue 7, Copyright (C) 2013 by the
Institute of Electrical and Electronics Engineers, Inc and The Open
Group. (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1
applied.) In the event of any discrepancy between this version and
the original IEEE and The Open Group Standard, the original IEEE and
The Open Group Standard is the referee document. The original
Standard can be obtained online at http://www.unix.org/online.html .
Any typographical or formatting errors that appear in this page are
most likely to have been introduced during the conversion of the
source files to man page format. To report such errors, see
IEEE/The Open Group 2013 MBSINIT(3P)