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RedHat 9 (Linux i386) - man page for mbsinit (redhat section 3)

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 represen-
       tation uses conversion state, of type mbstate_t.  Conversion of a string  uses  a  finite-
       state machine; when it is interrupted after the complete conversion of a number of charac-
       ters, it may need to save a state for processing the remaining characters. Such a  conver-
       sion 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,  and	the one used by wide character to multibyte conversion functions, such as
       wcsrtombs, 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 encod-
       ings like UTF-8, EUC-*, BIG5 or SJIS, the wide character to multibyte conversion functions
       never produce non-initial states, but the multibyte to wide character conversion functions
       like mbrtowc 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 non-zero if *ps is an initial state, or if ps is a null pointer. Otherwise
       it returns 0.

CONFORMING TO
       ISO/ANSI C, UNIX98

SEE ALSO
       mbsrtowcs(3), wcsrtombs(3)

NOTES
       The behaviour of mbsinit depends on the LC_CTYPE category of the current locale.

GNU					    2000-11-20				       MBSINIT(3)


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