/* $Id: strprintf.cpp 2981 2007-06-01 16:01:28Z vboxsync $ */
/** @file
 * innotek Portable Runtime - String Formatters.
 */

/*
 * Copyright (C) 2006-2007 innotek GmbH
 *
 * This file is part of VirtualBox Open Source Edition (OSE), as
 * available from http://www.virtualbox.org. This file 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 2 as it comes in the "COPYING" file of the VirtualBox OSE
 * distribution. VirtualBox OSE is distributed in the hope that it will
 * be useful, but WITHOUT ANY WARRANTY of any kind.
 *
 * If you received this file as part of a commercial VirtualBox
 * distribution, then only the terms of your commercial VirtualBox
 * license agreement apply instead of the previous paragraph.
 */


/*******************************************************************************
*   Header Files                                                               *
*******************************************************************************/
#include <iprt/string.h>
#include <iprt/assert.h>


/*******************************************************************************
*   Structures and Typedefs                                                    *
*******************************************************************************/
/** strbufoutput() argument structure. */
typedef struct STRBUFARG
{
    /** Pointer to current buffer position. */
    char   *psz;
    /** Number of bytes left in the buffer - not including the trailing zero. */
    size_t  cch;
} STRBUFARG;
/** Pointer to a strbufoutput() argument structure. */
typedef STRBUFARG *PSTRBUFARG;


/*******************************************************************************
*   Internal Functions                                                         *
*******************************************************************************/
static DECLCALLBACK(size_t) strbufoutput(void *pvArg, const char *pachChars, size_t cbChars);


/**
 * Output callback.
 *
 * @returns number of bytes written.
 * @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) strbufoutput(void *pvArg, const char *pachChars, size_t cbChars)
{
    PSTRBUFARG  pArg = (PSTRBUFARG)pvArg;

    cbChars = RT_MIN(pArg->cch, cbChars);
    if (cbChars)
    {
        memcpy(pArg->psz, pachChars, cbChars);
        pArg->cch -= cbChars;
        pArg->psz += cbChars;
    }
    *pArg->psz = '\0';

    return cbChars;
}


RTDECL(size_t) RTStrPrintfExV(PFNSTRFORMAT pfnFormat, void *pvArg, char *pszBuffer, size_t cchBuffer, const char *pszFormat, va_list args)
{
    if (!cchBuffer)
    {
        AssertMsgFailed(("Excellent idea! Format a string with no space for the output!\n"));
        return 0;
    }

    STRBUFARG Arg;
    Arg.psz = pszBuffer;
    Arg.cch = cchBuffer - 1;
    return RTStrFormatV(strbufoutput, &Arg, pfnFormat, pvArg, pszFormat, args);
}


RTDECL(size_t) RTStrPrintfV(char *pszBuffer, size_t cchBuffer, const char *pszFormat, va_list args)
{
    return RTStrPrintfExV(NULL, NULL, pszBuffer, cchBuffer, pszFormat, args);
}

RTDECL(size_t) RTStrPrintfEx(PFNSTRFORMAT pfnFormat, void *pvArg, char *pszBuffer, size_t cchBuffer, const char *pszFormat, ...)
{
    va_list args;
    va_start(args, pszFormat);
    size_t cbRet = RTStrPrintfExV(pfnFormat, pvArg, pszBuffer, cchBuffer, pszFormat, args);
    va_end(args);
    return cbRet;
}

RTDECL(size_t) RTStrPrintf(char *pszBuffer, size_t cchBuffer, const char *pszFormat, ...)
{
    va_list args;
    va_start(args, pszFormat);
    size_t cbRet = RTStrPrintfV(pszBuffer, cchBuffer, pszFormat, args);
    va_end(args);
    return cbRet;
}