1 /* 2 * Copyright (C) 2017 The Android Open Source Project 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in 12 * the documentation and/or other materials provided with the 13 * distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #ifndef _STDLIB_H 30 #error "Never include this file directly; instead, include <stdlib.h>" 31 #endif 32 33 #if defined(__BIONIC_FORTIFY) 34 #define __realpath_buf_too_small_str \ 35 "'realpath' output parameter must be NULL or a pointer to a buffer with >= PATH_MAX bytes" 36 37 /* PATH_MAX is unavailable without polluting the namespace, but it's always 4096 on Linux */ 38 #define __PATH_MAX 4096 39 40 #if defined(__clang__) 41 char* realpath(const char* path, char* resolved) 42 __clang_error_if(__bos(resolved) != __BIONIC_FORTIFY_UNKNOWN_SIZE && 43 __bos(resolved) < __PATH_MAX, __realpath_buf_too_small_str) 44 __clang_error_if(!path, "'realpath': NULL path is never correct; flipped arguments?"); 45 /* No need for a definition; the only issues we can catch are at compile-time. */ 46 47 #else /* defined(__clang__) */ 48 49 char* __realpath_real(const char*, char*) __RENAME(realpath); 50 __errordecl(__realpath_size_error, __realpath_buf_too_small_str); 51 52 __BIONIC_FORTIFY_INLINE 53 char* realpath(const char* path, char* resolved) { 54 size_t bos = __bos(resolved); 55 56 if (bos != __BIONIC_FORTIFY_UNKNOWN_SIZE && bos < __PATH_MAX) { 57 __realpath_size_error(); 58 } 59 60 return __realpath_real(path, resolved); 61 } 62 63 #endif /* defined(__clang__) */ 64 65 #undef __PATH_MAX 66 #undef __realpath_buf_too_small_str 67 #endif /* defined(__BIONIC_FORTIFY) */ 68
