/* $Id: RTFileModeToFlags.cpp 48820 2013-10-02 13:56:36Z vboxsync $ */ /** @file * IPRT - RTFileModeToFlags. */ /* * Copyright (C) 2013 Oracle Corporation * * 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 (GPL) 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. * * The contents of this file may alternatively be used under the terms * of the Common Development and Distribution License Version 1.0 * (CDDL) only, as it comes in the "COPYING.CDDL" file of the * VirtualBox OSE 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. */ /******************************************************************************* * Header Files * *******************************************************************************/ #include #include #include #include #include "internal/iprt.h" RTR3DECL(int) RTFileModeToFlags(const char *pszMode, uint64_t *puMode) { AssertPtrReturn(pszMode, VERR_INVALID_POINTER); AssertPtrReturn(puMode, VERR_INVALID_POINTER); int rc = VINF_SUCCESS; const char *pszCur = pszMode; uint64_t uMode = 0; char chPrev = 0; if (*pszCur == '\0') return VERR_INVALID_PARAMETER; while ( pszCur && *pszCur != '\0') { bool fSkip = false; switch (*pszCur) { /* Opens an existing file for writing and places the * file pointer at the end of the file. The file is * created if it does not exist. */ case 'a': if ((uMode & RTFILE_O_ACTION_MASK) == 0) { uMode |= RTFILE_O_OPEN_CREATE | RTFILE_O_WRITE | RTFILE_O_APPEND; } else rc = VERR_INVALID_PARAMETER; break; case 'b': /* Binary mode. */ /* Just skip as being valid. */ fSkip = true; break; /* Creates a file or open an existing one for * writing only. The file pointer will be placed * at the beginning of the file.*/ case 'c': if ((uMode & RTFILE_O_ACTION_MASK) == 0) { uMode |= RTFILE_O_OPEN_CREATE | RTFILE_O_WRITE; } else rc = VERR_INVALID_PARAMETER; break; /* Opens an existing file for reading and places the * file pointer at the beginning of the file. If the * file does not exist an error will be returned. */ case 'r': if ((uMode & RTFILE_O_ACTION_MASK) == 0) { uMode |= RTFILE_O_OPEN | RTFILE_O_READ; } else rc = VERR_INVALID_PARAMETER; break; case 't': /* Text mode. */ /* Just skip as being valid. */ fSkip = true; break; /* Creates a new file or replaces an existing one * for writing. Places the file pointer at the beginning. * An existing file will be truncated to 0 bytes. */ case 'w': if ((uMode & RTFILE_O_ACTION_MASK) == 0) { uMode |= RTFILE_O_CREATE_REPLACE | RTFILE_O_WRITE | RTFILE_O_TRUNCATE; } else rc = VERR_INVALID_PARAMETER; break; /* Creates a new file and opens it for writing. Places * the file pointer at the beginning. If the file * exists an error will be returned. */ case 'x': if ((uMode & RTFILE_O_ACTION_MASK) == 0) { uMode |= RTFILE_O_CREATE | RTFILE_O_WRITE; } else rc = VERR_INVALID_PARAMETER; break; case '+': { switch (chPrev) { case 'a': case 'c': case 'w': case 'x': /* Also open / create file with read access. */ uMode |= RTFILE_O_READ; break; case 'r': /* Also open / create file with write access. */ uMode |= RTFILE_O_WRITE; break; case 'b': case 't': /* Silently eat skipped parameters. */ fSkip = true; break; case 0: /* No previous character yet. */ case '+': /* Eat plusses which don't belong to a command. */ fSkip = true; break; default: rc = VERR_INVALID_PARAMETER; break; } break; } default: rc = VERR_INVALID_PARAMETER; break; } if (RT_FAILURE(rc)) break; if (!fSkip) chPrev = *pszCur; pszCur++; } /* No action mask set? */ if ( RT_SUCCESS(rc) && (uMode & RTFILE_O_ACTION_MASK) == 0) rc = VERR_INVALID_PARAMETER; /** @todo Handle sharing mode. */ uMode |= RTFILE_O_DENY_NONE; if (RT_SUCCESS(rc)) *puMode = uMode; return rc; } RT_EXPORT_SYMBOL(RTFileModeToFlags); RTR3DECL(int) RTFileModeToFlagsEx(const char *pszAccess, const char *pszDisposition, const char *pszSharing, uint64_t *puMode) { AssertPtrReturn(pszAccess, VERR_INVALID_POINTER); AssertPtrReturn(pszDisposition, VERR_INVALID_POINTER); /* pszSharing is not used yet. */ AssertPtrReturn(puMode, VERR_INVALID_POINTER); int rc = VINF_SUCCESS; const char *pszCur = pszAccess; uint64_t uMode = 0; char chPrev = 0; if (*pszCur == '\0') return VERR_INVALID_PARAMETER; /* * Handle access mode. */ while ( pszCur && *pszCur != '\0') { bool fSkip = false; switch (*pszCur) { case 'b': /* Binary mode. */ /* Just skip as being valid. */ fSkip = true; break; case 'r': /* Read. */ uMode |= RTFILE_O_READ; break; case 't': /* Text mode. */ /* Just skip as being valid. */ fSkip = true; break; case 'w': /* Write. */ uMode |= RTFILE_O_WRITE; break; case '+': { switch (chPrev) { case 'w': /* Also use read access in write mode. */ uMode |= RTFILE_O_READ; break; case 'r': /* Also use write access in read mode. */ uMode |= RTFILE_O_WRITE; break; case 'b': case 't': /* Silently eat skipped parameters. */ fSkip = true; break; case 0: /* No previous character yet. */ case '+': /* Eat plusses which don't belong to a command. */ fSkip = true; break; default: rc = VERR_INVALID_PARAMETER; break; } break; } default: rc = VERR_INVALID_PARAMETER; break; } if (RT_FAILURE(rc)) break; if (!fSkip) chPrev = *pszCur; pszCur++; } if (RT_FAILURE(rc)) return rc; /* * Handle disposition. */ pszCur = pszDisposition; /* Create a new file, always, overwrite an existing file. */ if (!RTStrCmp(pszCur, "ca")) uMode |= RTFILE_O_CREATE_REPLACE; /* Create a new file if it does not exist, fail if exist. */ else if (!RTStrCmp(pszCur, "ce")) uMode |= RTFILE_O_CREATE; /* Open existing file, create file if does not exist. */ else if (!RTStrCmp(pszCur, "oc")) uMode |= RTFILE_O_OPEN_CREATE; /* Open existing file and place the file pointer at * the end of the file, if opened with write access. * Create the file if does not exist. */ else if (!RTStrCmp(pszCur, "oa")) uMode |= RTFILE_O_OPEN_CREATE | RTFILE_O_APPEND; /* Open existing, fail if does not exist. */ else if (!RTStrCmp(pszCur, "oe")) uMode |= RTFILE_O_OPEN; /* Open and truncate existing, fail of not exist. */ else if (!RTStrCmp(pszCur, "ot")) uMode |= RTFILE_O_OPEN | RTFILE_O_TRUNCATE; else rc = VERR_INVALID_PARAMETER; /* No action mask set? */ if ( RT_SUCCESS(rc) && (uMode & RTFILE_O_ACTION_MASK) == 0) rc = VERR_INVALID_PARAMETER; /** @todo Handle sharing mode. */ uMode |= RTFILE_O_DENY_NONE; if (RT_SUCCESS(rc)) *puMode = uMode; return rc; } RT_EXPORT_SYMBOL(RTFileModeToFlagsEx);