1 //===-- Implementation of IncludeFileCommand ------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 #include "IncludeFileCommand.h"
10 
11 #include "llvm/Support/MemoryBuffer.h"
12 #include "llvm/Support/SourceMgr.h"
13 
14 #include <cstdlib>
15 
16 namespace llvm_libc {
17 
18 const char IncludeFileCommand::Name[] = "include_file";
19 
20 void IncludeFileCommand::run(llvm::raw_ostream &OS, const ArgVector &Args,
21                              llvm::StringRef StdHeader,
22                              llvm::RecordKeeper &Records,
23                              const Command::ErrorReporter &Reporter) const {
24   if (Args.size() != 1) {
25     Reporter.printFatalError(
26         "%%include_file command takes exactly 1 argument.");
27   }
28 
29   llvm::StringRef IncludeFile = Args[0];
30   auto Buffer = llvm::MemoryBuffer::getFileAsStream(IncludeFile);
31   if (!Buffer)
32     Reporter.printFatalError(llvm::StringRef("Unable to open ") + IncludeFile);
33 
34   llvm::StringRef Content = Buffer.get()->getBuffer();
35 
36   // If the included file has %%begin() command listed, then we want to write
37   // only the content after the begin command.
38   // TODO: The way the content is split below does not allow space within the
39   // the parentheses and, before and after the command. This probably is too
40   // strict and should be relaxed.
41   auto P = Content.split("\n%%begin()\n");
42   if (P.second.empty()) {
43     // There was no %%begin in the content.
44     OS << P.first;
45   } else {
46     OS << P.second;
47   }
48 }
49 
50 } // namespace llvm_libc
51