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Support: Add llvm::sys::fs::copy_file

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A function to copy one file's contents to another.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211302 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Justin Bogner 2014-06-19 19:35:39 +00:00
parent 581d5d5df8
commit f21de942f3
2 changed files with 40 additions and 0 deletions
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6
include/llvm/Support/FileSystem.h
View File

@ -335,6 +335,12 @@ std::error_code remove(const Twine &path, bool IgnoreNonExisting = true);
/// @param to The path to rename to. This is created.
std::error_code rename(const Twine &from, const Twine &to);
/// @brief Copy the contents of \a From to \a To.
///
/// @param From The path to copy from.
/// @param To The path to copy to. This is created.
std::error_code copy_file(const Twine &From, const Twine &To);
/// @brief Resize path to size. File is resized as if by POSIX truncate().
///
/// @param path Input path.

34
lib/Support/Path.cpp
View File

@ -846,6 +846,40 @@ std::error_code create_directories(const Twine &Path, bool IgnoreExisting) {
return create_directory(P, IgnoreExisting);
}
std::error_code copy_file(const Twine &From, const Twine &To) {
int ReadFD, WriteFD;
if (std::error_code EC = openFileForRead(From, ReadFD))
return EC;
if (std::error_code EC = openFileForWrite(To, WriteFD, F_None)) {
close(ReadFD);
return EC;
}
const size_t BufSize = 4096;
char *Buf = new char[BufSize];
int BytesRead = 0, BytesWritten = 0;
for (;;) {
BytesRead = read(ReadFD, Buf, BufSize);
if (BytesRead <= 0)
break;
while (BytesRead) {
BytesWritten = write(WriteFD, Buf, BytesRead);
if (BytesWritten < 0)
break;
BytesRead -= BytesWritten;
}
if (BytesWritten < 0)
break;
}
close(ReadFD);
close(WriteFD);
delete[] Buf;
if (BytesRead < 0 || BytesWritten < 0)
return std::error_code(errno, std::generic_category());
return std::error_code();
}
bool exists(file_status status) {
return status_known(status) && status.type() != file_type::file_not_found;
}