windows-server-2003/base/crts/crtw32/string/wcsncat.c

/***
*wcsncat.c - append n chars of string to new string
*
*	Copyright (c) 1985-2001, Microsoft Corporation. All rights reserved.
*
*Purpose:
*	defines wcsncat() - appends n characters of string onto
*	end of other string
*
*Revision History:
*	09-09-91  ETC	Created from strncat.c.
*	04-07-92  KRS	Updated and ripped out _INTL switches.
*	04-06-93  SKS	Replace _CRTAPI* with __cdecl
*       02-07-94  CFW   POSIXify.
*
*******************************************************************************/

#ifndef _POSIX_

#include <cruntime.h>
#include <string.h>

/***
*wchar_t *wcsncat(front, back, count) - append count chars of back onto front
*
*Purpose:
*	Appends at most count characters of the string back onto the
*	end of front, and ALWAYS terminates with a null character.
*	If count is greater than the length of back, the length of back
*	is used instead.  (Unlike wcsncpy, this routine does not pad out
*	to count characters).
*
*Entry:
*	wchar_t *front - string to append onto
*	wchar_t *back - string to append
*	size_t count - count of max characters to append
*
*Exit:
*	returns a pointer to string appended onto (front).
*
*Uses:
*
*Exceptions:
*
*******************************************************************************/

wchar_t * __cdecl wcsncat (
	wchar_t * front,
	const wchar_t * back,
	size_t count
	)
{
	wchar_t *start = front;

	while (*front++)
		;
	front--;

	while (count--)
		if (!(*front++ = *back++))
			return(start);

	*front = L'\0';
	return(start);
}

#endif /* _POSIX_ */