mbsrtowcs()

Convert a multibyte-character string into a wide-character string (restartable)

Synopsis:

#include <wchar.h>

size_t mbsrtowcs( wchar_t * dst, 
                  const char ** src,
                  size_t n, 
                  mbstate_t * ps );

Arguments:

dst: A pointer to a buffer where the function can store the wide-character string.
src: The string of multibyte characters that you want to convert.
n: The maximum number of wide characters to store in the buffer that dst points to.
ps: An internal pointer that lets mbsrtowcs() be a restartable version of mbstowcs(); if ps is NULL, mbsrtowcs() uses its own internal variable.
You can call mbsinit() to determine the status of this variable.

Library:

libc

Use the -l c option to qcc to link against this library. This library is usually included automatically.

Description:

The mbsrtowcs() function converts a string of multibyte characters pointed to by src into the corresponding wide characters pointed to by dst, to a maximum of n wide characters, including the terminating NULL character.

The function converts each character as if by a call to mbtowc() and stops early if:

a sequence of bytes doesn't conform to a valid character

Or:

converting the next character would exceed the limit of n wide characters

This function is affected by LC_CTYPE.

Returns:

(size_t)-1: Failure; invalid wide-character code.
x: Success; the number of total characters successfully converted, not including the terminating NULL character.

Errors:

EILSEQ: Invalid character sequence.
EINVAL: The ps argument points to an invalid object.

Classification:

ANSI, POSIX 1003.1

Safety:
Cancellation point	No
Interrupt handler	No
Signal handler	Yes
Thread	Read the Caveats

Caveats:

This function is safe to call in a multithreaded program if the ps argument isn't NULL.