1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/toolkit/crashreporter/google-breakpad/src/common/linux/safe_readlink.cc Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,53 @@
1.4 +// Copyright (c) 2011, Google Inc.
1.5 +// All rights reserved.
1.6 +//
1.7 +// Redistribution and use in source and binary forms, with or without
1.8 +// modification, are permitted provided that the following conditions are
1.9 +// met:
1.10 +//
1.11 +// * Redistributions of source code must retain the above copyright
1.12 +// notice, this list of conditions and the following disclaimer.
1.13 +// * Redistributions in binary form must reproduce the above
1.14 +// copyright notice, this list of conditions and the following disclaimer
1.15 +// in the documentation and/or other materials provided with the
1.16 +// distribution.
1.17 +// * Neither the name of Google Inc. nor the names of its
1.18 +// contributors may be used to endorse or promote products derived from
1.19 +// this software without specific prior written permission.
1.20 +//
1.21 +// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
1.22 +// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
1.23 +// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
1.24 +// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
1.25 +// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
1.26 +// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
1.27 +// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
1.28 +// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
1.29 +// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
1.30 +// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
1.31 +// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.32 +
1.33 +// safe_readlink.cc: Implement google_breakpad::SafeReadLink.
1.34 +// See safe_readlink.h for details.
1.35 +
1.36 +#include <stddef.h>
1.37 +
1.38 +#include "third_party/lss/linux_syscall_support.h"
1.39 +
1.40 +namespace google_breakpad {
1.41 +
1.42 +bool SafeReadLink(const char* path, char* buffer, size_t buffer_size) {
1.43 + // sys_readlink() does not add a NULL byte to |buffer|. In order to return
1.44 + // a NULL-terminated string in |buffer|, |buffer_size| should be at least
1.45 + // one byte longer than the expected path length. Also, sys_readlink()
1.46 + // returns the actual path length on success, which does not count the
1.47 + // NULL byte, so |result_size| should be less than |buffer_size|.
1.48 + ssize_t result_size = sys_readlink(path, buffer, buffer_size);
1.49 + if (result_size >= 0 && static_cast<size_t>(result_size) < buffer_size) {
1.50 + buffer[result_size] = '\0';
1.51 + return true;
1.52 + }
1.53 + return false;
1.54 +}
1.55 +
1.56 +} // namespace google_breakpad
