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07f51f788e
a simple adaptor class to give raw output capabilities to something that wants to write to an ostream. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54865 91177308-0d34-0410-b5e6-96231b3b80d8
103 lines
3.2 KiB
C++
103 lines
3.2 KiB
C++
//===--- raw_ostream.cpp - Implement the raw_ostream classes --------------===//
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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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// This implements support for bulk buffered stream output.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/raw_ostream.h"
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#include <ostream>
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using namespace llvm;
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#if !defined(_MSC_VER)
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#include <fcntl.h>
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#else
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#include <io.h>
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#define open(x,y,z) _open(x,y)
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#define write(fd, start, size) _write(fd, start, size)
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#define close(fd) _close(fd)
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#endif
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// An out of line virtual method to provide a home for the class vtable.
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void raw_ostream::handle() {}
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//===----------------------------------------------------------------------===//
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// raw_fd_ostream
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//===----------------------------------------------------------------------===//
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/// raw_fd_ostream - Open the specified file for writing. If an error occurs,
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/// information about the error is put into ErrorInfo, and the stream should
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/// be immediately destroyed.
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raw_fd_ostream::raw_fd_ostream(const char *Filename, std::string &ErrorInfo) {
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// Handle "-" as stdout.
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if (Filename[0] == '-' && Filename[1] == 0) {
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FD = STDOUT_FILENO;
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ShouldClose = false;
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return;
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}
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FD = open(Filename, O_WRONLY|O_CREAT|O_TRUNC, 0644);
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if (FD < 0) {
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ErrorInfo = "Error opening output file '" + std::string(Filename) + "'";
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ShouldClose = false;
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} else {
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ShouldClose = true;
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}
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}
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raw_fd_ostream::~raw_fd_ostream() {
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flush();
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if (ShouldClose)
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close(FD);
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}
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void raw_fd_ostream::flush_impl() {
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if (OutBufCur-OutBufStart)
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::write(FD, OutBufStart, OutBufCur-OutBufStart);
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HandleFlush();
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}
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//===----------------------------------------------------------------------===//
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// raw_stdout/err_ostream
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//===----------------------------------------------------------------------===//
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raw_stdout_ostream::raw_stdout_ostream():raw_fd_ostream(STDOUT_FILENO, false) {}
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raw_stderr_ostream::raw_stderr_ostream():raw_fd_ostream(STDERR_FILENO, false) {}
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// An out of line virtual method to provide a home for the class vtable.
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void raw_stdout_ostream::handle() {}
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void raw_stderr_ostream::handle() {}
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/// outs() - This returns a reference to a raw_ostream for standard output.
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/// Use it like: outs() << "foo" << "bar";
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raw_ostream &outs() {
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static raw_stdout_ostream S;
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return S;
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}
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/// errs() - This returns a reference to a raw_ostream for standard error.
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/// Use it like: errs() << "foo" << "bar";
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raw_ostream &errs() {
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static raw_stderr_ostream S;
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return S;
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}
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//===----------------------------------------------------------------------===//
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// raw_os_ostream
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//===----------------------------------------------------------------------===//
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/// flush_impl - The is the piece of the class that is implemented by
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/// subclasses. This outputs the currently buffered data and resets the
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/// buffer to empty.
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void raw_os_ostream::flush_impl() {
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if (OutBufCur-OutBufStart)
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OS.write(OutBufStart, OutBufCur-OutBufStart);
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HandleFlush();
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}
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