Make getSTDIN return null if the standard input is empty, as the header file
documentation implies and as its uses depend.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40939 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Support/MemoryBuffer.cpp b/lib/Support/MemoryBuffer.cpp
index 43eb181..0ae5676 100644
--- a/lib/Support/MemoryBuffer.cpp
+++ b/lib/Support/MemoryBuffer.cpp
@@ -248,11 +248,13 @@
// Read in all of the data from stdin, we cannot mmap stdin.
sys::Program::ChangeStdinToBinary();
- while (size_t ReadBytes = fread(Buffer, 1, 4096*4, stdin))
+ while (size_t ReadBytes = fread(Buffer, sizeof(char), 4096*4, stdin))
FileData.insert(FileData.end(), Buffer, Buffer+ReadBytes);
-
+
FileData.push_back(0); // &FileData[Size] is invalid. So is &*FileData.end().
size_t Size = FileData.size();
+ if (Size <= 1)
+ return 0;
MemoryBuffer *B = new STDINBufferFile();
B->initCopyOf(&FileData[0], &FileData[Size-1]);
return B;