Originální popis anglicky:
mbsinit - test for initial shift state
Návod, kniha: Linux Programmer's Manual
#include <wchar.h>
int mbsinit(const mbstate_t *ps);
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 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 encodings 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.
mbsinit returns non-zero if
*ps is an initial state, or if
ps is a null pointer. Otherwise it returns 0.
ISO/ANSI C, UNIX98
mbsrtowcs(3),
wcsrtombs(3)
The behaviour of
mbsinit depends on the LC_CTYPE category of the current
locale.
