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comparison: toolkit/crashreporter/google-breakpad/src/common/linux/safe_readlink.cc
toolkit/crashreporter/google-breakpad/src/common/linux/safe_readlink.cc
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| 1 // Copyright (c) 2011, Google Inc. | |
| 2 // All rights reserved. | |
| 3 // | |
| 4 // Redistribution and use in source and binary forms, with or without | |
| 5 // modification, are permitted provided that the following conditions are | |
| 6 // met: | |
| 7 // | |
| 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 | |
| 11 // copyright notice, this list of conditions and the following disclaimer | |
| 12 // in the documentation and/or other materials provided with the | |
| 13 // distribution. | |
| 14 // * Neither the name of Google Inc. nor the names of its | |
| 15 // contributors may be used to endorse or promote products derived from | |
| 16 // this software without specific prior written permission. | |
| 17 // | |
| 18 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
| 19 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
| 20 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
| 21 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
| 22 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
| 23 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
| 24 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
| 25 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
| 26 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 27 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
| 28 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 29 | |
| 30 // safe_readlink.cc: Implement google_breakpad::SafeReadLink. | |
| 31 // See safe_readlink.h for details. | |
| 32 | |
| 33 #include <stddef.h> | |
| 34 | |
| 35 #include "third_party/lss/linux_syscall_support.h" | |
| 36 | |
| 37 namespace google_breakpad { | |
| 38 | |
| 39 bool SafeReadLink(const char* path, char* buffer, size_t buffer_size) { | |
| 40 // sys_readlink() does not add a NULL byte to |buffer|. In order to return | |
| 41 // a NULL-terminated string in |buffer|, |buffer_size| should be at least | |
| 42 // one byte longer than the expected path length. Also, sys_readlink() | |
| 43 // returns the actual path length on success, which does not count the | |
| 44 // NULL byte, so |result_size| should be less than |buffer_size|. | |
| 45 ssize_t result_size = sys_readlink(path, buffer, buffer_size); | |
| 46 if (result_size >= 0 && static_cast<size_t>(result_size) < buffer_size) { | |
| 47 buffer[result_size] = '\0'; | |
| 48 return true; | |
| 49 } | |
| 50 return false; | |
| 51 } | |
| 52 | |
| 53 } // namespace google_breakpad |
