/* * Copyright (c) 2011 Apple, Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this * file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_LICENSE_HEADER_END@ */ #include <string.h> char * stpncpy(char * restrict dst, const char * restrict src, size_t maxlen) { const size_t srclen = strnlen(src, maxlen); if (srclen < maxlen) { // The stpncpy() and strncpy() functions copy at most maxlen // characters from src into dst. memcpy(dst, src, srclen); // If src is less than maxlen characters long, the remainder // of dst is filled with '\0' characters. memset(dst+srclen, 0, maxlen-srclen); // The stpcpy() and stpncpy() functions return a pointer to the // terminating '\0' character of dst. return dst+srclen; } else { // The stpncpy() and strncpy() functions copy at most maxlen // characters from src into dst. memcpy(dst, src, maxlen); // If stpncpy() does not terminate dst with a NUL character, it // instead returns a pointer to src[maxlen] (which does not // necessarily refer to a valid memory location.) return dst+maxlen; } }