Virtual device abstraction (#1577)

* IOFile: removes seek limit checks when file is writable

* add virtual devices scaffold

* add stdin/out/err as virtual devices

* fixed some merging issues

* clang-fix

---------

Co-authored-by: georgemoralis <giorgosmrls@gmail.com>

src/core/devices/logger.cpp

@@ -0,0 +1,64 @@
+//  SPDX-FileCopyrightText: Copyright 2024 shadPS4 Emulator Project
+//  SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "common/logging/log.h"
+#include "core/libraries/kernel/file_system.h"
+#include "logger.h"
+
+namespace Core::Devices {
+
+Logger::Logger(std::string prefix, bool is_err) : prefix(std::move(prefix)), is_err(is_err) {}
+
+Logger::~Logger() = default;
+
+s64 Logger::write(const void* buf, size_t nbytes) {
+    log(static_cast<const char*>(buf), nbytes);
+    return nbytes;
+}
+size_t Logger::writev(const Libraries::Kernel::SceKernelIovec* iov, int iovcnt) {
+    for (int i = 0; i < iovcnt; i++) {
+        log(static_cast<const char*>(iov[i].iov_base), iov[i].iov_len);
+    }
+    return iovcnt;
+}
+
+s64 Logger::pwrite(const void* buf, size_t nbytes, u64 offset) {
+    log(static_cast<const char*>(buf), nbytes);
+    return nbytes;
+}
+
+s32 Logger::fsync() {
+    log_flush();
+    return 0;
+}
+
+void Logger::log(const char* buf, size_t nbytes) {
+    std::scoped_lock lock{mtx};
+    const char* end = buf + nbytes;
+    for (const char* it = buf; it < end; ++it) {
+        char c = *it;
+        if (c == '\r') {
+            continue;
+        }
+        if (c == '\n') {
+            log_flush();
+            continue;
+        }
+        buffer.push_back(c);
+    }
+}
+
+void Logger::log_flush() {
+    std::scoped_lock lock{mtx};
+    if (buffer.empty()) {
+        return;
+    }
+    if (is_err) {
+        LOG_ERROR(Tty, "[{}] {}", prefix, std::string_view{buffer});
+    } else {
+        LOG_INFO(Tty, "[{}] {}", prefix, std::string_view{buffer});
+    }
+    buffer.clear();
+}
+
+} // namespace Core::Devices