| 1 | /* $Id: RTDirCreateUniqueNumbered-generic.cpp 57358 2015-08-14 15:16:38Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - RTDirCreateUniqueNumbered, generic implementation.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2011-2015 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/dir.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 | #include <iprt/err.h>
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| 36 | #include <iprt/path.h>
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| 37 | #include <iprt/string.h>
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| 38 |
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| 39 |
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| 40 | RTDECL(int) RTDirCreateUniqueNumbered(char *pszPath, size_t cbSize, RTFMODE fMode, signed int cchDigits, char chSep)
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| 41 | {
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| 42 | /*
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| 43 | * Validate input.
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| 44 | */
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| 45 | AssertPtrReturn(pszPath, VERR_INVALID_POINTER);
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| 46 | AssertReturn(cbSize, VERR_BUFFER_OVERFLOW);
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| 47 | AssertReturn(cchDigits > 0, VERR_INVALID_PARAMETER);
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| 48 |
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| 49 | /* Check that there is sufficient space. */
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| 50 | char *pszEnd = RTStrEnd(pszPath, cbSize);
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| 51 | AssertReturn(pszEnd, VERR_BUFFER_OVERFLOW);
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| 52 | AssertReturn(cbSize - 1 - (pszEnd - pszPath) >= (size_t)cchDigits + (chSep ? 1 : 0), VERR_BUFFER_OVERFLOW);
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| 53 | size_t cbLeft = cbSize - (pszEnd - pszPath);
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| 54 |
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| 55 | /* First try is to create the path without any numbers. */
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| 56 | int rc = RTDirCreate(pszPath, fMode, 0);
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| 57 | if ( RT_SUCCESS(rc)
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| 58 | || rc != VERR_ALREADY_EXISTS)
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| 59 | return rc;
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| 60 |
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| 61 | /* If the separator value isn't zero, add it. */
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| 62 | if (chSep != '\0')
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| 63 | {
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| 64 | cbLeft--;
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| 65 | *pszEnd++ = chSep;
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| 66 | *pszEnd = '\0';
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| 67 | }
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| 68 |
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| 69 | /* How many tries? Stay within somewhat sane limits. */
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| 70 | uint32_t cMaxTries;
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| 71 | if (cchDigits >= 8)
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| 72 | cMaxTries = 100 * _1M;
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| 73 | else
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| 74 | {
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| 75 | cMaxTries = 10;
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| 76 | for (int a = 0; a < cchDigits - 1; ++a)
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| 77 | cMaxTries *= 10;
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| 78 | }
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| 79 |
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| 80 | /* Try cMaxTries - 1 times to create a directory with appended numbers. */
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| 81 | uint32_t i = 1;
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| 82 | while (i < cMaxTries)
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| 83 | {
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| 84 | /* Format the number with leading zero's. */
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| 85 | ssize_t rc2 = RTStrFormatU32(pszEnd, cbLeft, i, 10, cchDigits, 0, RTSTR_F_WIDTH | RTSTR_F_ZEROPAD);
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| 86 | if (RT_FAILURE((int) rc2))
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| 87 | {
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| 88 | *pszPath = '\0';
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| 89 | return (int)rc2;
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| 90 | }
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| 91 | rc = RTDirCreate(pszPath, fMode, 0);
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| 92 | if (RT_SUCCESS(rc))
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| 93 | return rc;
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| 94 | ++i;
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| 95 | }
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| 96 |
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| 97 | /* We've given up. */
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| 98 | *pszPath = '\0';
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| 99 | return VERR_ALREADY_EXISTS;
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| 100 | }
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| 101 | RT_EXPORT_SYMBOL(RTDirCreateUniqueNumbered);
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| 102 |
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