/* * 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 * strncat(char *restrict dst, const char *restrict src, size_t maxlen) { const size_t dstlen = strlen(dst); const size_t srclen = strnlen(src, maxlen); // The strcat() and strncat() functions append a copy of the null- // terminated string src to the end of the null-terminated string dst, // then add a terminating '\0'. The string dst must have sufficient // space to hold the result. // // The strncat() function appends not more than maxlen characters // from src, and then adds a terminating '\0'. const size_t cpylen = srclen < maxlen ? srclen : maxlen; memcpy(dst+dstlen, src, cpylen); dst[dstlen+cpylen] = '\0'; // The strcat() and strncat() functions return dst. return dst; }