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MBSINIT(3)		   Linux Programmer's Manual		    MBSINIT(3)

NAME
       mbsinit - test for initial shift state

SYNOPSIS
       #include <wchar.h>

       int mbsinit(const mbstate_t *ps);

DESCRIPTION
       Character  conversion between the multibyte representation and the wide
       character representation uses  conversion  state,  of  type  mbstate_t.
       Conversion  of  a string uses a finite-state machine; when it is inter‐
       rupted after the complete conversion of a number of characters, it  may
       need  to	 save a state for processing the remaining characters.	Such a
       conversion state is needed for the sake of encodings such  as  ISO-2022
       and UTF-7.

       The  initial  state  is	the  state at the beginning of conversion of a
       string.	There are two kinds of state: The one  used  by	 multibyte  to
       wide  character conversion functions, such as mbsrtowcs(3), and the one
       used by wide character to multibyte conversion functions, such as wcsr‐
       tombs(3), but they both fit in a mbstate_t, and they both have the same
       representation for an initial state.

       For 8-bit encodings, all states are equivalent to  the  initial	state.
       For multibyte encodings like UTF-8, EUC-*, BIG5 or SJIS, the wide char‐
       acter to	 multibyte  conversion	functions  never  produce  non-initial
       states,	but  the multibyte to wide-character conversion functions like
       mbrtowc(3) do produce non-initial states when interrupted in the middle
       of a character.

       One  possible  way to create an mbstate_t in initial state is to set it
       to zero:

	   mbstate_t state;
	   memset(&state,0,sizeof(mbstate_t));

       On Linux, the following works as	 well,	but  might  generate  compiler
       warnings:

	   mbstate_t state = { 0 };

       The  function  mbsinit()	 tests	whether	 *ps corresponds to an initial
       state.

RETURN VALUE
       mbsinit() returns nonzero if *ps is an initial state, or	 if  ps	 is  a
       NULL pointer.  Otherwise it returns 0.

ATTRIBUTES
   Multithreading (see pthreads(7))
       The mbsinit() function is thread-safe.

CONFORMING TO
       C99.

NOTES
       The  behavior of mbsinit() depends on the LC_CTYPE category of the cur‐
       rent locale.

SEE ALSO
       mbsrtowcs(3), wcsrtombs(3)

COLOPHON
       This page is part of release 3.54 of the Linux  man-pages  project.   A
       description  of	the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.

GNU				  2013-08-26			    MBSINIT(3)
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