MBSINIT (3)
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 interrupted
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 SJIS.
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 or UTF-8 encodings, all states are equivalent to the initial state.
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
SEE ALSO
NOTES
The behaviour of mbsinit depends on the LC_CTYPE category of the
current locale.
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