| George Burgess IV | b97049c | 2017-07-24 15:05:05 -0700 | [diff] [blame^] | 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 >= PATH_MAX bytes buffer" |
| 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 | |
| 42 | __BIONIC_ERROR_FUNCTION_VISIBILITY |
| 43 | char* realpath(const char* path, char* resolved) __overloadable |
| 44 | __enable_if(__bos(resolved) != __BIONIC_FORTIFY_UNKNOWN_SIZE && |
| 45 | __bos(resolved) < __PATH_MAX, __realpath_buf_too_small_str) |
| 46 | __errorattr(__realpath_buf_too_small_str); |
| 47 | |
| 48 | /* No need for a FORTIFY version; the only things we can catch are at |
| 49 | * compile-time. |
| 50 | */ |
| 51 | |
| 52 | #else /* defined(__clang__) */ |
| 53 | |
| 54 | char* __realpath_real(const char*, char*) __RENAME(realpath); |
| 55 | __errordecl(__realpath_size_error, __realpath_buf_too_small_str); |
| 56 | |
| 57 | __BIONIC_FORTIFY_INLINE |
| 58 | char* realpath(const char* path, char* resolved) { |
| 59 | size_t bos = __bos(resolved); |
| 60 | |
| 61 | if (bos != __BIONIC_FORTIFY_UNKNOWN_SIZE && bos < __PATH_MAX) { |
| 62 | __realpath_size_error(); |
| 63 | } |
| 64 | |
| 65 | return __realpath_real(path, resolved); |
| 66 | } |
| 67 | |
| 68 | #endif /* defined(__clang__) */ |
| 69 | |
| 70 | #undef __PATH_MAX |
| 71 | #undef __realpath_buf_too_small_str |
| 72 | #endif /* defined(__BIONIC_FORTIFY) */ |