From 5bfac5d2edac78a0c0f91e751dc0c173158a4829 Mon Sep 17 00:00:00 2001 From: Chris Lattner Date: Wed, 2 Jun 2004 00:52:22 +0000 Subject: [PATCH] Implement the new CopyFile function git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@13945 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Support/FileUtilities.cpp | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) diff --git a/lib/Support/FileUtilities.cpp b/lib/Support/FileUtilities.cpp index ed594db96ea..bd5cf09be7c 100644 --- a/lib/Support/FileUtilities.cpp +++ b/lib/Support/FileUtilities.cpp @@ -109,6 +109,41 @@ bool llvm::DiffFiles(const std::string &FileA, const std::string &FileB, } +/// CopyFile - Copy the specified source file to the specified destination, +/// overwriting destination if it exists. This returns true on failure. +/// +bool llvm::CopyFile(const std::string &Dest, const std::string &Src) { + FDHandle InFD(open(Src.c_str(), O_RDONLY)); + if (InFD == -1) return true; + + FileRemover FR(Dest); + + FDHandle OutFD(open(Dest.c_str(), O_WRONLY|O_CREAT, 0666)); + if (OutFD == -1) return true; + + char Buffer[16*1024]; + while (ssize_t Amt = read(InFD, Buffer, 16*1024)) { + if (Amt == -1) { + if (errno != EINTR) return true; // Error reading the file. + } else { + char *BufPtr = Buffer; + while (Amt) { + ssize_t AmtWritten = write(OutFD, BufPtr, Amt); + if (AmtWritten == -1) { + if (errno != EINTR) return true; // Error writing the file. + } else { + Amt -= AmtWritten; + BufPtr += AmtWritten; + } + } + } + } + + FR.releaseFile(); // Success! + return false; +} + + /// MoveFileOverIfUpdated - If the file specified by New is different than Old, /// or if Old does not exist, move the New file over the Old file. Otherwise, /// remove the New file.