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ffd1746d03
This commit merges the latest LLVM sources from the vendor space. It also updates the build glue to match the new sources. Clang's version number is changed to match LLVM's, which means /usr/include/clang/2.0 has been renamed to /usr/include/clang/2.8. Obtained from: projects/clangbsd
87 lines
2.8 KiB
C++
87 lines
2.8 KiB
C++
//===- FileUpdate.cpp - Conditionally update a file -----------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// FileUpdate is a utility for conditionally updating a file from its input
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// based on whether the input differs from the output. It is used to avoid
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// unnecessary modifications in a build system.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/PrettyStackTrace.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/System/Signals.h"
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using namespace llvm;
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static cl::opt<bool>
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Quiet("quiet", cl::desc("Don't print unnecessary status information"),
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cl::init(false));
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static cl::opt<std::string>
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InputFilename("input-file", cl::desc("Input file (defaults to stdin)"),
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cl::init("-"), cl::value_desc("filename"));
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static cl::opt<std::string>
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OutputFilename(cl::Positional, cl::desc("<output-file>"), cl::Required);
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int main(int argc, char **argv) {
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sys::PrintStackTraceOnErrorSignal();
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PrettyStackTraceProgram X(argc, argv);
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cl::ParseCommandLineOptions(argc, argv);
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// Get the input data.
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std::string ErrorStr;
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MemoryBuffer *In =
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MemoryBuffer::getFileOrSTDIN(InputFilename.c_str(), &ErrorStr);
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if (In == 0) {
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errs() << argv[0] << ": error: Unable to get input '"
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<< InputFilename << "': " << ErrorStr << '\n';
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return 1;
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}
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// Get the output data.
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MemoryBuffer *Out = MemoryBuffer::getFile(OutputFilename.c_str(), &ErrorStr);
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// If the output exists and the contents match, we are done.
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if (Out && In->getBufferSize() == Out->getBufferSize() &&
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memcmp(In->getBufferStart(), Out->getBufferStart(),
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Out->getBufferSize()) == 0) {
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if (!Quiet)
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outs() << argv[0] << ": Not updating '" << OutputFilename
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<< "', contents match input.\n";
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return 0;
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}
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delete Out;
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// Otherwise, overwrite the output.
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if (!Quiet)
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outs() << argv[0] << ": Updating '" << OutputFilename
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<< "', contents changed.\n";
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raw_fd_ostream OutStream(OutputFilename.c_str(), ErrorStr,
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raw_fd_ostream::F_Binary);
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if (!ErrorStr.empty()) {
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errs() << argv[0] << ": Unable to write output '"
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<< OutputFilename << "': " << ErrorStr << '\n';
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return 1;
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}
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OutStream.write(In->getBufferStart(), In->getBufferSize());
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OutStream.close();
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if (OutStream.has_error()) {
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errs() << argv[0] << ": Could not open output file '"
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<< OutputFilename << "': " << ErrorStr << '\n';
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OutStream.clear_error();
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return 1;
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}
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return 0;
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}
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