From afc11065bb151349090d8ae89cb61d1c35bdddae Mon Sep 17 00:00:00 2001
From: Dominick Allen <djallen@librehumanitas.org>
Date: Mon, 28 Oct 2024 23:49:50 -0500
Subject: Prepare for new SSO.

---
 source/fud_file.cpp | 123 ++++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 114 insertions(+), 9 deletions(-)

(limited to 'source/fud_file.cpp')

diff --git a/source/fud_file.cpp b/source/fud_file.cpp
index e27a46d..8dab031 100644
--- a/source/fud_file.cpp
+++ b/source/fud_file.cpp
@@ -82,6 +82,7 @@ FileResult RegularFile::open(
             return FudStatus::Partial;
         case ENOENT:
             return FudStatus::NotFound;
+        case EBADF:
         case EFBIG:
         case EOVERFLOW:
         case EINVAL:
@@ -117,17 +118,100 @@ FileResult RegularFile::open(
     return file;
 }
 
-/*
-    static FileResult RegularFile::create(
-        StringView filename,
-        FileAccessMode mode,
-        OpenFlags flags,
-        bool exclusive,
-        Option<int> dirFdOption,
-        Allocator* allocator = &globalFudAllocator);
+FileResult RegularFile::create(
+    StringView filename,
+    FileAccessMode mode,
+    OpenFlags flags,
+    Permissions permissions,
+    bool exclusive,
+    Option<int> dirFdOption,
+    Allocator* allocator)
 {
+    if (allocator == nullptr) {
+        return FudStatus::NullPointer;
+    }
+
+    if (!filename.nullTerminated()) {
+        return FudStatus::ArgumentInvalid;
+    }
+
+    int dirFd = dirFdOption.valueOr(AT_FDCWD);
+
+    RegularFile file{};
+
+    uint32_t openFlags = 0;
+    switch (mode) {
+    case FileAccessMode::Read:
+        openFlags = O_RDONLY;
+        break;
+    case FileAccessMode::Write:
+        openFlags = O_WRONLY;
+        break;
+    case FileAccessMode::ReadWrite:
+        openFlags = O_RDWR;
+        break;
+    default:
+        return FudStatus::ArgumentInvalid;
+    }
+
+    if (flags.hasFlag(OpenFlagEnum::Append) && flags.hasFlag(OpenFlagEnum::Truncate)) {
+        return FudStatus::OperationInvalid;
+    }
+
+    openFlags |= flags.flags() | O_CREAT | (O_EXCL * static_cast<uint8_t>(exclusive));
+
+    open_how openHow{};
+    zeroObject(openHow);
+    openHow.flags = openFlags;
+    openHow.resolve = RESOLVE_NO_SYMLINKS;
+    openHow.mode = permissions.mode();
+
+    auto status = syscall(SYS_openat2, dirFd, filename.data(), &openHow, sizeof(openHow));
+    if (status == -1) {
+        if constexpr (EAGAIN != EWOULDBLOCK && status == EWOULDBLOCK) {
+            return FudStatus::Partial;
+        }
+        switch (errno) {
+        case ETXTBSY:
+        case EAGAIN:
+            return FudStatus::Partial;
+        case EBADF:
+        case EFBIG:
+        case EOVERFLOW:
+        case EINVAL:
+        case EISDIR:
+        case ENAMETOOLONG:
+            return FudStatus::ArgumentInvalid;
+        case EROFS:
+        case EACCES:
+        case EPERM:
+            return FudStatus::PermissionDenied;
+        case EDQUOT:
+        case ENOENT:
+        case ELOOP:
+        case EXDEV:
+        case ENFILE:
+        case E2BIG:
+        default:
+            return FudStatus::Failure;
+        }
+    }
+    fudAssert(status <= std::numeric_limits<decltype(file.m_fd)>::max());
+    file.m_fd = static_cast<decltype(file.m_fd)>(status);
+
+    using Stat = struct stat;
+    Stat sBuffer{};
+    auto fStatus = fstat(file.m_fd, &sBuffer);
+    if (fStatus == -1) {
+        return FudStatus::Failure;
+    }
+
+    if ((sBuffer.st_mode & S_IFMT) != S_IFREG) {
+        return FudStatus::ObjectInvalid;
+    }
+
+    return file;
 }
-*/
 
 RegularFile::~RegularFile()
 {
@@ -198,4 +282,25 @@ FudStatus RegularFile::close()
     return status;
 }
 
+Result<size_t, FudStatus> RegularFile::size() const
+{
+    auto fileSize = lseek(m_fd, 0, SEEK_END);
+    if (fileSize == -1) {
+        switch (errno) {
+        case EBADF:
+        case ESPIPE:
+            return FudStatus::ObjectInvalid;
+        default:
+            return FudStatus::Failure;
+        }
+    }
+
+    auto seekBegin = lseek(m_fd, 0, SEEK_SET);
+    if (seekBegin == -1) {
+        return FudStatus::Failure;
+    }
+
+    return static_cast<size_t>(fileSize);
+}
+
 } // namespace fud
-- 
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