Manual Pages  — MBSTOWCS

mbstowcs – convert a character string to a wide-character string

LIBRARY SYNOPSIS DESCRIPTION RETURN VALUES ERRORS SEE ALSO STANDARDS

Standard C Library (libc, -lc)

#include <stdlib.h>

size_t
mbstowcs(wchar_t * restrict wcstring, const char * restrict mbstring, size_t nwchars);

The mbstowcs() function converts a multibyte character string mbstring beginning in the initial conversion state into a wide character string wcstring. No more than nwchars wide characters are stored. A terminating null wide character is appended if there is room.

The mbstowcs() function returns the number of wide characters converted, not counting any terminating null wide character, or -1 if an invalid multibyte character was encountered.

The mbstowcs() function will fail if:

[EILSEQ]
	An invalid multibyte sequence was detected.
[EINVAL]
	The conversion state is invalid.

The mbstowcs() function conforms to ISO/IEC 9899:1999 ("ISO C99").