| 1 | /* $Id: strprintf.cpp 93115 2022-01-01 11:31:46Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - String Formatters.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2022 Oracle Corporation
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | *
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| 17 | * The contents of this file may alternatively be used under the terms
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| 18 | * of the Common Development and Distribution License Version 1.0
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| 19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 20 | * VirtualBox OSE distribution, in which case the provisions of the
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| 21 | * CDDL are applicable instead of those of the GPL.
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| 22 | *
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| 23 | * You may elect to license modified versions of this file under the
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| 24 | * terms and conditions of either the GPL or the CDDL or both.
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| 25 | */
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| 26 |
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| 27 |
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| 28 | /*********************************************************************************************************************************
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| 29 | * Header Files *
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| 30 | *********************************************************************************************************************************/
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| 31 | #include <iprt/string.h>
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| 32 | #include "internal/iprt.h"
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| 33 |
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| 34 | #include <iprt/assert.h>
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| 35 |
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| 36 |
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| 37 | /*********************************************************************************************************************************
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| 38 | * Structures and Typedefs *
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| 39 | *********************************************************************************************************************************/
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| 40 | /** strbufoutput() argument structure. */
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| 41 | typedef struct STRBUFARG
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| 42 | {
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| 43 | /** Pointer to current buffer position. */
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| 44 | char *psz;
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| 45 | /** Number of bytes left in the buffer - not including the trailing zero. */
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| 46 | size_t cch;
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| 47 | } STRBUFARG;
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| 48 | /** Pointer to a strbufoutput() argument structure. */
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| 49 | typedef STRBUFARG *PSTRBUFARG;
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| 50 |
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| 51 |
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| 52 | /*********************************************************************************************************************************
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| 53 | * Internal Functions *
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| 54 | *********************************************************************************************************************************/
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| 55 | static DECLCALLBACK(size_t) strbufoutput(void *pvArg, const char *pachChars, size_t cbChars);
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| 56 |
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| 57 |
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| 58 | /**
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| 59 | * Output callback.
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| 60 | *
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| 61 | * @returns number of bytes written.
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| 62 | * @param pvArg Pointer to a STRBUFARG structure.
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| 63 | * @param pachChars Pointer to an array of utf-8 characters.
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| 64 | * @param cbChars Number of bytes in the character array pointed to by pachChars.
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| 65 | */
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| 66 | static DECLCALLBACK(size_t) strbufoutput(void *pvArg, const char *pachChars, size_t cbChars)
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| 67 | {
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| 68 | PSTRBUFARG pArg = (PSTRBUFARG)pvArg;
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| 69 | char *pszCur = pArg->psz; /* We actually have to spell this out for VS2010, or it will load for each case. */
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| 70 |
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| 71 | cbChars = RT_MIN(pArg->cch, cbChars);
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| 72 | if (cbChars)
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| 73 | {
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| 74 | pArg->cch -= cbChars;
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| 75 |
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| 76 | /* Note! For VS2010/64 we need at least 7 case statements before it generates a jump table. */
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| 77 | switch (cbChars)
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| 78 | {
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| 79 | default:
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| 80 | memcpy(pszCur, pachChars, cbChars);
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| 81 | break;
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| 82 | case 8: pszCur[7] = pachChars[7]; RT_FALL_THRU();
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| 83 | case 7: pszCur[6] = pachChars[6]; RT_FALL_THRU();
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| 84 | case 6: pszCur[5] = pachChars[5]; RT_FALL_THRU();
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| 85 | case 5: pszCur[4] = pachChars[4]; RT_FALL_THRU();
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| 86 | case 4: pszCur[3] = pachChars[3]; RT_FALL_THRU();
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| 87 | case 3: pszCur[2] = pachChars[2]; RT_FALL_THRU();
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| 88 | case 2: pszCur[1] = pachChars[1]; RT_FALL_THRU();
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| 89 | case 1: pszCur[0] = pachChars[0]; RT_FALL_THRU();
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| 90 | case 0:
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| 91 | break;
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| 92 | }
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| 93 | pArg->psz = pszCur += cbChars;
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| 94 | }
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| 95 | *pszCur = '\0';
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| 96 |
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| 97 | return cbChars;
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| 98 | }
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| 99 |
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| 100 |
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| 101 | RTDECL(size_t) RTStrPrintfV(char *pszBuffer, size_t cchBuffer, const char *pszFormat, va_list args)
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| 102 | {
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| 103 | STRBUFARG Arg;
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| 104 | AssertMsgReturn(cchBuffer, ("Excellent idea! Format a string with no space for the output!\n"), 0);
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| 105 | Arg.psz = pszBuffer;
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| 106 | Arg.cch = cchBuffer - 1;
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| 107 | return RTStrFormatV(strbufoutput, &Arg, NULL, NULL, pszFormat, args);
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| 108 | }
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| 109 | RT_EXPORT_SYMBOL(RTStrPrintfV);
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| 110 |
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| 111 |
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| 112 | RTDECL(size_t) RTStrPrintfExV(PFNSTRFORMAT pfnFormat, void *pvArg, char *pszBuffer, size_t cchBuffer, const char *pszFormat, va_list args)
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| 113 | {
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| 114 | STRBUFARG Arg;
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| 115 | AssertMsgReturn(cchBuffer, ("Excellent idea! Format a string with no space for the output!\n"), 0);
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| 116 | Arg.psz = pszBuffer;
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| 117 | Arg.cch = cchBuffer - 1;
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| 118 | return RTStrFormatV(strbufoutput, &Arg, pfnFormat, pvArg, pszFormat, args);
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| 119 | }
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| 120 | RT_EXPORT_SYMBOL(RTStrPrintfExV);
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| 121 |
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