1 files changed, 150 insertions, 0 deletions
diff --git a/src/VBox/Runtime/common/string/strprintf2.cpp b/src/VBox/Runtime/common/string/strprintf2.cpp
new file mode 100644
index 00000000..7a087c68
--- /dev/null
+++ b/src/VBox/Runtime/common/string/strprintf2.cpp
@@ -0,0 +1,150 @@
+/* $Id: strprintf2.cpp $ */
+/** @file
+ * IPRT - String Formatters, alternative.
+ */
+
+/*
+ * Copyright (C) 2006-2023 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/string.h>
+#include "internal/iprt.h"
+
+#include <iprt/assert.h>
+
+
+/*********************************************************************************************************************************
+*   Structures and Typedefs                                                                                                      *
+*********************************************************************************************************************************/
+/** rtStrPrintf2Output() argument structure. */
+typedef struct STRPRINTF2OUTPUTARGS
+{
+    /** Pointer to current buffer position. */
+    char   *pszCur;
+    /** Number of bytes left in the buffer (including the trailing zero). */
+    size_t  cbLeft;
+    /** Set if we overflowed. */
+    bool    fOverflowed;
+} STRPRINTF2OUTPUTARGS;
+/** Pointer to a rtStrPrintf2Output() argument structure. */
+typedef STRPRINTF2OUTPUTARGS *PSTRPRINTF2OUTPUTARGS;
+
+
+/**
+ * Output callback.
+ *
+ * @returns cbChars
+ *
+ * @param   pvArg       Pointer to a STRBUFARG structure.
+ * @param   pachChars   Pointer to an array of utf-8 characters.
+ * @param   cbChars     Number of bytes in the character array pointed to by pachChars.
+ */
+static DECLCALLBACK(size_t) rtStrPrintf2Output(void *pvArg, const char *pachChars, size_t cbChars)
+{
+    PSTRPRINTF2OUTPUTARGS pArgs = (PSTRPRINTF2OUTPUTARGS)pvArg;
+    char *pszCur = pArgs->pszCur; /* We actually have to spell this out for VS2010, or it will load it for each case. */
+
+    if (cbChars < pArgs->cbLeft)
+    {
+        pArgs->cbLeft -= cbChars;
+
+        /* Note! For VS2010/64 we need at least 7 case statements before it generates a jump table. */
+        switch (cbChars)
+        {
+            default:
+                memcpy(pszCur, pachChars, cbChars);
+                break;
+            case 8: pszCur[7] = pachChars[7]; RT_FALL_THRU();
+            case 7: pszCur[6] = pachChars[6]; RT_FALL_THRU();
+            case 6: pszCur[5] = pachChars[5]; RT_FALL_THRU();
+            case 5: pszCur[4] = pachChars[4]; RT_FALL_THRU();
+            case 4: pszCur[3] = pachChars[3]; RT_FALL_THRU();
+            case 3: pszCur[2] = pachChars[2]; RT_FALL_THRU();
+            case 2: pszCur[1] = pachChars[1]; RT_FALL_THRU();
+            case 1: pszCur[0] = pachChars[0]; RT_FALL_THRU();
+            case 0:
+                break;
+        }
+        pArgs->pszCur = pszCur += cbChars;
+        *pszCur = '\0';
+    }
+    else
+    {
+        size_t cbLeft = pArgs->cbLeft;
+        if (cbLeft-- > 1)
+        {
+            memcpy(pszCur, pachChars, cbLeft);
+            pArgs->pszCur = pszCur += cbLeft;
+            *pszCur = '\0';
+            pArgs->cbLeft = 1;
+        }
+        pArgs->fOverflowed = true;
+    }
+
+    return cbChars;
+}
+
+
+RTDECL(ssize_t) RTStrPrintf2V(char *pszBuffer, size_t cchBuffer, const char *pszFormat, va_list args)
+{
+    STRPRINTF2OUTPUTARGS Args;
+    size_t cchRet;
+    AssertMsg(cchBuffer > 0, ("Excellent idea! Format a string with no space for the output!\n"));
+
+    Args.pszCur      = pszBuffer;
+    Args.cbLeft      = cchBuffer;
+    Args.fOverflowed = false;
+
+    cchRet = RTStrFormatV(rtStrPrintf2Output, &Args, NULL, NULL, pszFormat, args);
+
+    return !Args.fOverflowed ? (ssize_t)cchRet : -(ssize_t)cchRet - 1;
+}
+RT_EXPORT_SYMBOL(RTStrPrintf2V);
+
+
+RTDECL(ssize_t) RTStrPrintf2ExV(PFNSTRFORMAT pfnFormat, void *pvArg, char *pszBuffer, size_t cchBuffer,
+                                const char *pszFormat,  va_list args)
+{
+    STRPRINTF2OUTPUTARGS Args;
+    size_t cchRet;
+    AssertMsg(cchBuffer > 0, ("Excellent idea! Format a string with no space for the output!\n"));
+
+    Args.pszCur      = pszBuffer;
+    Args.cbLeft      = cchBuffer;
+    Args.fOverflowed = false;
+    cchRet = RTStrFormatV(rtStrPrintf2Output, &Args, pfnFormat, pvArg, pszFormat, args);
+    return !Args.fOverflowed ? (ssize_t)cchRet : -(ssize_t)cchRet - 1;
+}
+RT_EXPORT_SYMBOL(RTStrPrintf2ExV);
+