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ae5193c24e
This patch is part of a bigger patch that helps merging the breakpad code with the modified version in Chromium OS. Specifically, this patch makes the following changes: 1. Add a SafeReadLink function that wraps sys_readlink() to resolve a symbolic link but guarantees the result is NULL-terminated on success. 2. Refactor other source code to use SafeReadLink instead of readlink() or sys_readlink(). BUG=455 TEST=Tested the following: 1. Build on 32-bit and 64-bit Linux with gcc 4.4.3 and gcc 4.6. 2. Build on Mac OS X 10.6.8 with gcc 4.2 and clang 3.0 (with latest gmock). 3. All unit tests pass. 4. Run minidump-2-core to covnert a minidump file to a core file. Review URL: http://breakpad.appspot.com/334001 git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@896 4c0a9323-5329-0410-9bdc-e9ce6186880e
66 lines
2.9 KiB
C++
66 lines
2.9 KiB
C++
// Copyright (c) 2011, Google Inc.
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// safe_readlink.h: Define the google_breakpad::SafeReadLink function,
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// which wraps sys_readlink and gurantees the result is NULL-terminated.
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#ifndef COMMON_LINUX_SAFE_READLINK_H_
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#define COMMON_LINUX_SAFE_READLINK_H_
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#include <stddef.h>
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namespace google_breakpad {
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// This function wraps sys_readlink() and performs the same functionalty,
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// but guarantees |buffer| is NULL-terminated if sys_readlink() returns
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// no error. It takes the same arguments as sys_readlink(), but unlike
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// sys_readlink(), it returns true on success.
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//
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// |buffer_size| specifies the size of |buffer| in bytes. As this function
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// always NULL-terminates |buffer| on success, |buffer_size| should be
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// at least one byte longer than the expected path length (e.g. PATH_MAX,
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// which is typically defined as the maximum length of a path name
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// including the NULL byte).
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//
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// The implementation of this function calls sys_readlink() instead of
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// readlink(), it can thus be used in the context where calling to libc
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// functions is discouraged.
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bool SafeReadLink(const char* path, char* buffer, size_t buffer_size);
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// Same as the three-argument version of SafeReadLink() but deduces the
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// size of |buffer| if it is a char array of known size.
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template <size_t N>
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bool SafeReadLink(const char* path, char (&buffer)[N]) {
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return SafeReadLink(path, buffer, sizeof(buffer));
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}
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} // namespace google_breakpad
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#endif // COMMON_LINUX_SAFE_READLINK_H_
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