1 files changed, 165 insertions, 0 deletions
diff --git a/src/VBox/Runtime/common/vfs/vfsprintf.cpp b/src/VBox/Runtime/common/vfs/vfsprintf.cpp
new file mode 100644
index 00000000..496eedb4
--- /dev/null
+++ b/src/VBox/Runtime/common/vfs/vfsprintf.cpp
@@ -0,0 +1,165 @@
+/* $Id: vfsprintf.cpp $ */
+/** @file
+ * IPRT - Virtual File System, File Printf.
+ */
+
+/*
+ * Copyright (C) 2010-2023 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, in version 3 of the
+ * License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses>.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
+ * in the VirtualBox distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#include <iprt/vfs.h>
+
+#include <iprt/errcore.h>
+#include <iprt/string.h>
+
+
+/** Writes the buffer to the VFS file. */
+static void FlushPrintfBuffer(PVFSIOSTRMOUTBUF pBuf)
+{
+    if (pBuf->offBuf)
+    {
+        int rc = RTVfsIoStrmWrite(pBuf->hVfsIos, pBuf->szBuf, pBuf->offBuf, true /*fBlocking*/, NULL);
+        if (RT_FAILURE(rc))
+            pBuf->rc = rc;
+        pBuf->offBuf   = 0;
+        pBuf->szBuf[0] = '\0';
+    }
+}
+
+
+/**
+ * @callback_method_impl{FNRTSTROUTPUT,
+ *      For use with VFSIOSTRMOUTBUF.}
+ */
+RTDECL(size_t) RTVfsIoStrmStrOutputCallback(void *pvArg, const char *pachChars, size_t cbChars)
+{
+    PVFSIOSTRMOUTBUF pBuf = (PVFSIOSTRMOUTBUF)pvArg;
+    AssertReturn(pBuf->cbSelf == sizeof(*pBuf), 0);
+
+    if (cbChars != 0)
+    {
+        if (cbChars <= sizeof(pBuf->szBuf) * 3 / 2)
+        {
+            /*
+             * Small piece of output: Buffer it.
+             */
+            size_t offSrc = 0;
+            while  (offSrc < cbChars)
+            {
+                size_t cbLeft = sizeof(pBuf->szBuf) - pBuf->offBuf - 1;
+                if (cbLeft > 0)
+                {
+                    size_t cbToCopy = RT_MIN(cbChars - offSrc, cbLeft);
+                    memcpy(&pBuf->szBuf[pBuf->offBuf], &pachChars[offSrc], cbToCopy);
+                    pBuf->offBuf += cbToCopy;
+                    pBuf->szBuf[pBuf->offBuf] = '\0';
+                    if (cbLeft > cbToCopy)
+                        break;
+                    offSrc += cbToCopy;
+                }
+                FlushPrintfBuffer(pBuf);
+            }
+        }
+        else
+        {
+            /*
+             * Large chunk of output: Output it directly.
+            */
+            FlushPrintfBuffer(pBuf);
+
+            int rc = RTVfsIoStrmWrite(pBuf->hVfsIos, pachChars, cbChars, true /*fBlocking*/, NULL);
+            if (RT_FAILURE(rc))
+                pBuf->rc = rc;
+        }
+    }
+    else /* Special zero byte write at the end of the formatting. */
+        FlushPrintfBuffer(pBuf);
+    return cbChars;
+}
+
+
+RTDECL(ssize_t) RTVfsIoStrmPrintfV(RTVFSIOSTREAM hVfsIos, const char *pszFormat, va_list va)
+{
+    VFSIOSTRMOUTBUF Buf;
+    VFSIOSTRMOUTBUF_INIT(&Buf, hVfsIos);
+
+    size_t cchRet = RTStrFormatV(RTVfsIoStrmStrOutputCallback, &Buf, NULL, NULL, pszFormat, va);
+    if (RT_SUCCESS(Buf.rc))
+        return cchRet;
+    return Buf.rc;
+}
+
+
+RTDECL(ssize_t) RTVfsIoStrmPrintf(RTVFSIOSTREAM hVfsIos, const char *pszFormat, ...)
+{
+    va_list va;
+    va_start(va, pszFormat);
+    ssize_t cchRet = RTVfsIoStrmPrintfV(hVfsIos, pszFormat, va);
+    va_end(va);
+    return cchRet;
+}
+
+
+RTDECL(ssize_t) RTVfsFilePrintfV(RTVFSFILE hVfsFile, const char *pszFormat, va_list va)
+{
+    ssize_t cchRet;
+    RTVFSIOSTREAM hVfsIos = RTVfsFileToIoStream(hVfsFile);
+    if (hVfsIos != NIL_RTVFSIOSTREAM)
+    {
+        cchRet = RTVfsIoStrmPrintfV(hVfsIos, pszFormat, va);
+        RTVfsIoStrmRelease(hVfsIos);
+    }
+    else
+        cchRet = VERR_INVALID_HANDLE;
+    return cchRet;
+}
+
+
+RTDECL(ssize_t) RTVfsFilePrintf(RTVFSFILE hVfsFile, const char *pszFormat, ...)
+{
+    ssize_t cchRet;
+    RTVFSIOSTREAM hVfsIos = RTVfsFileToIoStream(hVfsFile);
+    if (hVfsIos != NIL_RTVFSIOSTREAM)
+    {
+        va_list va;
+        va_start(va, pszFormat);
+        cchRet = RTVfsIoStrmPrintfV(hVfsIos, pszFormat, va);
+        va_end(va);
+        RTVfsIoStrmRelease(hVfsIos);
+    }
+    else
+        cchRet = VERR_INVALID_HANDLE;
+    return cchRet;
+}
+