# mbstate_t

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< c‎ | string‎ | multibyte

Defined in header `<uchar.h>` |  | (since C11)
Defined in header `<wchar.h>` |  |
struct mbstate_t; |  | (since C95)

The type `mbstate_t` is a trivial non-array type that can represent any of the conversion states that can occur in an implementation-defined set of supported multibyte character encoding rules. Zero-initialized value of `mbstate_t` represents the initial conversion state, although other values of `mbstate_t` may exist that also represent the initial conversion state.

Possible implementation of `mbstate_t` is a struct type holding an array representing the incomplete multibyte character, an integer counter indicating the number of bytes in the array that have been processed, and a representation of the current shift state.

The following functions should not be called from multiple threads without synchronization with the mbstate_t* argument of `NULL` due to possible data races: mbrlen, mbrtowc, mbsrtowcs, mbtowc, wcrtomb, wcsrtombs, wctomb.

### References

- C11 standard (ISO/IEC 9899:2011):

  - 7.29.1/2 Introduction (p: 402)

- C99 standard (ISO/IEC 9899:1999):

  - 7.24.1/2 Introduction (p: 348)

### See also

mbsinit (C95) | checks if the mbstate_t object represents initial shift state (function)
C++ documentation for mbstate_t

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