diff options
Diffstat (limited to 'externals/breakpad/src/common/linux/safe_readlink.cc')
| -rw-r--r-- | externals/breakpad/src/common/linux/safe_readlink.cc | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/externals/breakpad/src/common/linux/safe_readlink.cc b/externals/breakpad/src/common/linux/safe_readlink.cc new file mode 100644 index 0000000000..a42b01a5fa --- /dev/null +++ b/externals/breakpad/src/common/linux/safe_readlink.cc @@ -0,0 +1,56 @@ +// Copyright 2011 Google LLC +// +// Redistribution and use in source and binary forms, with or without +// modification, are permitted provided that the following conditions are +// met: +// +// * Redistributions of source code must retain the above copyright +// notice, this list of conditions and the following disclaimer. +// * Redistributions in binary form must reproduce the above +// copyright notice, this list of conditions and the following disclaimer +// in the documentation and/or other materials provided with the +// distribution. +// * Neither the name of Google LLC nor the names of its +// contributors may be used to endorse or promote products derived from +// this software without specific prior written permission. +// +// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +// safe_readlink.cc: Implement google_breakpad::SafeReadLink. +// See safe_readlink.h for details. + +#ifdef HAVE_CONFIG_H +#include <config.h> // Must come first +#endif + +#include <stddef.h> + +#include "third_party/lss/linux_syscall_support.h" + +namespace google_breakpad { + +bool SafeReadLink(const char* path, char* buffer, size_t buffer_size) { + // sys_readlink() does not add a NULL byte to |buffer|. In order to return + // a NULL-terminated string in |buffer|, |buffer_size| should be at least + // one byte longer than the expected path length. Also, sys_readlink() + // returns the actual path length on success, which does not count the + // NULL byte, so |result_size| should be less than |buffer_size|. + ssize_t result_size = sys_readlink(path, buffer, buffer_size); + if (result_size >= 0 && static_cast<size_t>(result_size) < buffer_size) { + buffer[result_size] = '\0'; + return true; + } + return false; +} + +} // namespace google_breakpad |