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Add a wrapper for open.

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This centralizes the handling of O_BINARY and opens the way for hiding more
differences (like how open behaves with directories).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186447 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola
2013-07-16 19:44:17 +00:00
parent 1a9c39e52a
commit c1b49b56d4
27 changed files with 130 additions and 119 deletions
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46
lib/Support/Path.cpp
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@@ -18,6 +18,7 @@
#include <cctype>
#include <cstdio>
#include <cstring>
#include <fcntl.h>
#if !defined(_MSC_VER) && !defined(__MINGW32__)
#include <unistd.h>
@@ -691,6 +692,51 @@ error_code createUniqueDirectory(const Twine &Prefix,
true, 0, FS_Dir);
}
error_code openFileForWrite(const Twine &Name, int &ResultFD,
sys::fs::OpenFlags Flags, unsigned Mode) {
// Verify that we don't have both "append" and "excl".
assert((!(Flags & sys::fs::F_Excl) || !(Flags & sys::fs::F_Append)) &&
"Cannot specify both 'excl' and 'append' file creation flags!");
int OpenFlags = O_WRONLY | O_CREAT;
#ifdef O_BINARY
if (Flags & F_Binary)
OpenFlags |= O_BINARY;
#endif
if (Flags & F_Append)
OpenFlags |= O_APPEND;
else
OpenFlags |= O_TRUNC;
if (Flags & F_Excl)
OpenFlags |= O_EXCL;
SmallString<128> Storage;
StringRef P = Name.toNullTerminatedStringRef(Storage);
while ((ResultFD = open(P.begin(), OpenFlags, Mode)) < 0) {
if (errno != EINTR)
return error_code(errno, system_category());
}
return error_code::success();
}
error_code openFileForRead(const Twine &Name, int &ResultFD) {
int OpenFlags = O_RDONLY;
#ifdef O_BINARY
OpenFlags |= O_BINARY; // Open input file in binary mode on win32.
#endif
SmallString<128> Storage;
StringRef P = Name.toNullTerminatedStringRef(Storage);
while ((ResultFD = open(P.begin(), OpenFlags)) < 0) {
if (errno != EINTR)
return error_code(errno, system_category());
}
return error_code::success();
}
error_code make_absolute(SmallVectorImpl<char> &path) {
StringRef p(path.data(), path.size());