/*
 * String functions
 *
 * Copyright 1993 Yngvi Sigurjonsson
 * Copyright 1996 Alexandre Julliard
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <ctype.h>
#include <stdarg.h>
#include <string.h>

#include "ntstatus.h"
#include "windef.h"
#include "winbase.h"
#include "wine/winbase16.h"
#include "wine/exception.h"
#include "wine/unicode.h"
#include "winerror.h"
#include "winnls.h"
#include "excpt.h"
#include "wine/debug.h"

WINE_DEFAULT_DEBUG_CHANNEL(string);

/***********************************************************************
 *           lstrcpyn    (KERNEL32.@)
 *           lstrcpynA   (KERNEL32.@)
 *
 * Note: this function differs from the UNIX strncpy, it _always_ writes
 * a terminating \0.
 *
 * Note: n is an INT but Windows treats it as unsigned, and will happily
 * copy a gazillion chars if n is negative.
 */
LPSTR WINAPI lstrcpynA( LPSTR dst, LPCSTR src, INT n )
{
    LPSTR p = dst;
    UINT count = n;

    TRACE("(%p, %s, %i)\n", dst, debugstr_a(src), n);

    /* In real windows the whole function is protected by an exception handler
     * that returns ERROR_INVALID_PARAMETER on faulty parameters
     * We currently just check for NULL.
     */
    if (!dst || !src) {
    	SetLastError(ERROR_INVALID_PARAMETER);
	return 0;
    }
    while ((count > 1) && *src)
    {
        count--;
        *p++ = *src++;
    }
    if (count) *p = 0;
    return dst;
}


/***********************************************************************
 *           lstrcpynW   (KERNEL32.@)
 *
 * Note: this function differs from the UNIX strncpy, it _always_ writes
 * a terminating \0
 *
 * Note: n is an INT but Windows treats it as unsigned, and will happily
 * copy a gazillion chars if n is negative.
 */
LPWSTR WINAPI lstrcpynW( LPWSTR dst, LPCWSTR src, INT n )
{
    LPWSTR p = dst;
    UINT count = n;

    TRACE("(%p, %s, %i)\n", dst,  debugstr_w(src), n);

    /* In real windows the whole function is protected by an exception handler
     * that returns ERROR_INVALID_PARAMETER on faulty parameters
     * We currently just check for NULL.
     */
    if (!dst || !src) {
    	SetLastError(ERROR_INVALID_PARAMETER);
	return 0;
    }
    while ((count > 1) && *src)
    {
        count--;
        *p++ = *src++;
    }
    if (count) *p = 0;
    return dst;
}