/* * Copyright (c) 2007 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 <stdlib.h> #include <string.h> extern void __chk_fail (void) __attribute__((__noreturn__)); char * __strncat_chk (char *restrict dest, const char *restrict src, size_t len, size_t dstlen) { char *s1 = dest; const char *s2 = src; /* Advance to the end. */ while (*s1 != 0) { if (__builtin_expect (dstlen-- == 0, 0)) __chk_fail (); s1++; } /* Append the string. */ while (len > 0) { if (__builtin_expect (dstlen-- == 0, 0)) __chk_fail (); if ((*s1 = *s2++) == 0) break; s1++; len--; } *s1 = 0; return dest; }