The Open Group Base Specifications Issue 6
IEEE Std 1003.1, 2004 Edition
Copyright © 2001-2004 The IEEE and The Open Group, All Rights reserved.

#### NAME

> wcsncpy - copy part of a wide-character string

#### SYNOPSIS

> ``#include <wchar.h>
> wchar_t *wcsncpy(wchar_t *restrict` ws1`, const wchar_t *restrict` ws2`,
> size_t` n`);
> ``

#### DESCRIPTION

> [CX] The functionality described on this reference page is aligned with the ISO C standard. Any conflict between the requirements described here and the ISO C standard is unintentional. This volume of IEEE Std 1003.1-2001 defers to the ISO C standard.

> The wcsncpy() function shall copy not more than n wide-character codes (wide-character codes that follow a null wide-character code are not copied) from the array pointed to by ws2 to the array pointed to by ws1. If copying takes place between objects that overlap, the behavior is undefined.

> If the array pointed to by ws2 is a wide-character string that is shorter than n wide-character codes, null wide-character codes shall be appended to the copy in the array pointed to by ws1, until n wide-character codes in all are written.

#### RETURN VALUE

> The wcsncpy() function shall return ws1; no return value is reserved to indicate an error.

#### ERRORS

> No errors are defined.

The following sections are informative.

#### EXAMPLES

> None.

#### APPLICATION USAGE

> If there is no null wide-character code in the first n wide-character codes of the array pointed to by ws2, the result is not null-terminated.

#### RATIONALE

> None.

#### FUTURE DIRECTIONS

> None.

#### SEE ALSO

> wcscpy(), the Base Definitions volume of IEEE Std 1003.1-2001, <wchar.h>

#### CHANGE HISTORY

> First released in Issue 4. Derived from the MSE working draft.

#### Issue 6

> The wcsncpy() prototype is updated for alignment with the ISO/IEC 9899:1999 standard.

End of informative text.

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