mbsrtowcs

 

C

Language

Standard Library

Type support

Dynamic memory management

Error handling

Program utilities

Date and time utilities

Strings library

Algorithms

Numerics

Input/output support

Localization support

Thread support (C11)

Atomic operations (C11)

 

Strings library

Byte strings

Multibyte strings

Wide strings

 

Null-terminated multibyte strings

Wide/multibyte conversions
mbsinit
mbtowc mbstowcs btowc mbrtowc mbsrtowcs mblen mbrtoc16 c16rtomb	wctomb wcstombs wctob wcrtomb wcsrtombs mbrlen mbrtoc32 c32rtomb
Types
mbstate_t

 

Defined in header <wchar.h>
size_t mbsrtowcs( wchar_t* dst, const char** src, size_t len, mbstate_t* ps )

Converts a null-terminated multibyte character sequence, which begins in the conversion state described by *ps, from the array whose first element is pointed to by *src to its wide character representation. If dst is not null, converted characters are stored in the successive elements of the wchar_t array pointed to by dst. No more than len wide characters are written to the destination array.

Each multibyte character is converted as if by a call to mbrtowc. The conversion stops if:

• The multibyte null character was converted and stored. src is set to NULL and *ps represents the initial shift state.
• An invalid multibyte character (according to the current C locale) was encountered. src is set to point at the beginning of the first unconverted multibyte character.
• the next wide character to be stored would exceed len. src is set to point at the beginning of the first unconverted multibyte character. This condition is not checked if dst==NULL.

Parameters

dst	-	pointer to wide character array where the results will be stored
src	-	pointer to pointer to the first element of a null-terminated multibyte string
len	-	number of wide characters available in the array pointed to by dst
ps	-	pointer to the conversion state object

Return value

On success, returns the number of wide characters, excluding the terminating L'\0', written to the character array.. If dst==NULL, returns the number of wide characters that would have been written given unlimited length.

On conversion error (if invalid multibyte character was encountered), returns (size_t)-1, stores EILSEQ in errno, and leaves *ps in unspecified state.

See also

mbrtowc	converts the next multibyte character to wide character, given state (function)
wcsrtombs	converts a wide string to narrow multibyte character string, given state (function)
C++ documentation for mbsrtowcs