X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/2049ba38adafa0ec146880de29f26e32dd69a125..ccc040255c07064f2ed96f1a345d21860b202cb6:/src/common/file.cpp diff --git a/src/common/file.cpp b/src/common/file.cpp index 52a39d4d34..f9badf5395 100644 --- a/src/common/file.cpp +++ b/src/common/file.cpp @@ -1,5 +1,5 @@ ///////////////////////////////////////////////////////////////////////////// -// Name: file.cpp +// Name: src/common/file.cpp // Purpose: wxFile - encapsulates low-level "file descriptor" // wxTempFile // Author: Vadim Zeitlin @@ -7,82 +7,129 @@ // Created: 29/01/98 // RCS-ID: $Id$ // Copyright: (c) 1998 Vadim Zeitlin -// Licence: wxWindows license +// Licence: wxWindows licence ///////////////////////////////////////////////////////////////////////////// // ---------------------------------------------------------------------------- // headers // ---------------------------------------------------------------------------- -#ifdef __GNUG__ -#pragma implementation "file.h" -#endif - // For compilers that support precompilation, includes "wx.h". #include "wx/wxprec.h" -#include "wx/defs.h" #ifdef __BORLANDC__ -#pragma hdrstop + #pragma hdrstop #endif +#if wxUSE_FILE + // standard -#if defined(__WXMSW__) && !defined(__GNUWIN32__) - #include +#if defined(__WINDOWS__) && !defined(__GNUWIN32__) && !defined(__WXMICROWIN__) && !defined(__WXWINCE__) + +#define WIN32_LEAN_AND_MEAN +#define NOSERVICE +#define NOIME +#define NOATOM +#define NOGDI +#define NOGDICAPMASKS +#define NOMETAFILE +#define NOMINMAX +#define NOMSG +#define NOOPENFILE +#define NORASTEROPS +#define NOSCROLL +#define NOSOUND +#define NOSYSMETRICS +#define NOTEXTMETRIC +#define NOWH +#define NOCOMM +#define NOKANJI +#define NOCRYPT +#define NOMCX + +#elif defined(__WINDOWS__) && defined(__WXWINCE__) + #include "wx/msw/missing.h" +#elif (defined(__OS2__)) + #include #elif (defined(__UNIX__) || defined(__GNUWIN32__)) - #include + #include + #include + #include + #ifdef __GNUWIN32__ + #include "wx/msw/wrapwin.h" + #endif +#elif defined(__DOS__) + #if defined(__WATCOMC__) + #include + #elif defined(__DJGPP__) + #include + #include + #include + #else + #error "Please specify the header with file functions declarations." + #endif +#elif (defined(__WXSTUBS__)) + // Have to ifdef this for different environments + #include +#elif (defined(__WXMAC__)) +#if __MSL__ < 0x6000 + int access( const char *path, int mode ) { return 0 ; } #else - #error "Please specify the header with file functions declarations." + int _access( const char *path, int mode ) { return 0 ; } +#endif + char* mktemp( char * path ) { return path ;} + #include + #include +#else + #error "Please specify the header with file functions declarations." #endif //Win/UNIX #include // SEEK_xxx constants -#include // O_RDONLY &c -#include // needed for stat -#include // stat - -// Microsoft compiler loves underscores, feed them to it -#ifdef _MSC_VER - // functions - #define open _open - #define close _close - #define read _read - #define write _write - #define lseek _lseek - #define fsync _commit - #define access _access - #define eof _eof - - // types - #define stat _stat - - // constants - #define O_RDONLY _O_RDONLY - #define O_WRONLY _O_WRONLY - #define O_RDWR _O_RDWR - #define O_EXCL _O_EXCL - #define O_CREAT _O_CREAT - #define O_BINARY _O_BINARY - - #define S_IFDIR _S_IFDIR - #define S_IFREG _S_IFREG - - #define S_IREAD _S_IREAD - #define S_IWRITE _S_IWRITE -#else - #define tell(fd) lseek(fd, 0, SEEK_CUR) -#endif //_MSC_VER -// there is no distinction between text and binary files under Unix -#ifdef __UNIX__ - #define O_BINARY (0) -#endif //__UNIX__ +#ifndef __WXWINCE__ + #include +#endif -// wxWindows -#include -#include -#include -#include +// Windows compilers don't have these constants +#ifndef W_OK + enum + { + F_OK = 0, // test for existence + X_OK = 1, // execute permission + W_OK = 2, // write + R_OK = 4 // read + }; +#endif // W_OK + +// wxWidgets +#ifndef WX_PRECOMP + #include "wx/string.h" + #include "wx/intl.h" + #include "wx/log.h" + #include "wx/crt.h" +#endif // !WX_PRECOMP + +#include "wx/filename.h" +#include "wx/file.h" +#include "wx/filefn.h" + +// there is no distinction between text and binary files under Unix, so define +// O_BINARY as 0 if the system headers don't do it already +#if defined(__UNIX__) && !defined(O_BINARY) + #define O_BINARY (0) +#endif //__UNIX__ + +#ifdef __WINDOWS__ + #include "wx/msw/mslu.h" +#endif + +#ifdef __WXWINCE__ + #include "wx/msw/private.h" +#endif +#ifndef MAX_PATH + #define MAX_PATH 512 +#endif // ============================================================================ // implementation of wxFile @@ -91,10 +138,36 @@ // ---------------------------------------------------------------------------- // static functions // ---------------------------------------------------------------------------- -bool wxFile::Exists(const char *sz) -{ - struct stat st; - return !access(sz, 0) && !stat(sz, &st) && (st.st_mode & S_IFREG); + +bool wxFile::Exists(const wxString& name) +{ + return wxFileExists(name); +} + +bool wxFile::Access(const wxString& name, OpenMode mode) +{ + int how; + + switch ( mode ) + { + default: + wxFAIL_MSG(wxT("bad wxFile::Access mode parameter.")); + // fall through + + case read: + how = R_OK; + break; + + case write: + how = W_OK; + break; + + case read_write: + how = R_OK | W_OK; + break; + } + + return wxAccess(name, how) == 0; } // ---------------------------------------------------------------------------- @@ -102,132 +175,218 @@ bool wxFile::Exists(const char *sz) // ---------------------------------------------------------------------------- // ctors -wxFile::wxFile(const char *szFileName, OpenMode mode) +wxFile::wxFile(const wxString& fileName, OpenMode mode) { - m_fd = fd_invalid; + m_fd = fd_invalid; + m_lasterror = 0; - Open(szFileName, mode); + Open(fileName, mode); } -// dtor -wxFile::~wxFile() +bool wxFile::CheckForError(wxFileOffset rc) const { - Close(); + if ( rc != -1 ) + return false; + + const_cast(this)->m_lasterror = +#ifndef __WXWINCE__ + errno +#else + ::GetLastError() +#endif + ; + + return true; } // create the file, fail if it already exists and bOverwrite -bool wxFile::Create(const char *szFileName, bool bOverwrite) +bool wxFile::Create(const wxString& fileName, bool bOverwrite, int accessMode) { - // if bOverwrite we create a new file or truncate the existing one, - // otherwise we only create the new file and fail if it already exists - int fd = open(szFileName, O_CREAT | (bOverwrite ? O_TRUNC : O_EXCL)); - - if ( fd == -1 ) { - wxLogSysError("can't create file '%s'", szFileName); - return FALSE; - } - else { - Attach(fd); - return TRUE; - } + // if bOverwrite we create a new file or truncate the existing one, + // otherwise we only create the new file and fail if it already exists + int fildes = wxOpen( fileName, + O_BINARY | O_WRONLY | O_CREAT | + (bOverwrite ? O_TRUNC : O_EXCL), + accessMode ); + if ( CheckForError(fildes) ) + { + wxLogSysError(_("can't create file '%s'"), fileName); + return false; + } + + Attach(fildes); + return true; } // open the file -bool wxFile::Open(const char *szFileName, OpenMode mode) +bool wxFile::Open(const wxString& fileName, OpenMode mode, int accessMode) { - int flags = O_BINARY; - - switch ( mode ) { - case read: - flags |= O_RDONLY; - break; - - case write: - flags |= O_WRONLY | O_CREAT | O_TRUNC; - break; - - case write_append: - flags |= O_WRONLY | O_APPEND; - break; - - case read_write: - flags |= O_RDWR; - break; - } - - int fd = open(szFileName, flags, S_IREAD | S_IWRITE); - - if ( fd == -1 ) { - wxLogSysError("can't open file '%s'", szFileName); - return FALSE; - } - else { - Attach(fd); - return TRUE; - } + int flags = O_BINARY; + + switch ( mode ) + { + case read: + flags |= O_RDONLY; + break; + + case write_append: + if ( wxFile::Exists(fileName) ) + { + flags |= O_WRONLY | O_APPEND; + break; + } + //else: fall through as write_append is the same as write if the + // file doesn't exist + + case write: + flags |= O_WRONLY | O_CREAT | O_TRUNC; + break; + + case write_excl: + flags |= O_WRONLY | O_CREAT | O_EXCL; + break; + + case read_write: + flags |= O_RDWR; + break; + } + +#ifdef __WINDOWS__ + // only read/write bits for "all" are supported by this function under + // Windows, and VC++ 8 returns EINVAL if any other bits are used in + // accessMode, so clear them as they have at best no effect anyhow + accessMode &= wxS_IRUSR | wxS_IWUSR; +#endif // __WINDOWS__ + + int fildes = wxOpen( fileName, flags, accessMode); + + if ( CheckForError(fildes) ) + { + wxLogSysError(_("can't open file '%s'"), fileName); + return false; + } + + Attach(fildes); + return true; } // close bool wxFile::Close() { - if ( IsOpened() ) { - if ( close(m_fd) == -1 ) { - wxLogSysError("can't close file descriptor %d", m_fd); - m_fd = fd_invalid; - return FALSE; + if ( IsOpened() ) { + if ( CheckForError(wxClose(m_fd)) ) + { + wxLogSysError(_("can't close file descriptor %d"), m_fd); + m_fd = fd_invalid; + return false; + } + else + m_fd = fd_invalid; } - else - m_fd = fd_invalid; - } - return TRUE; + return true; } // ---------------------------------------------------------------------------- // read/write // ---------------------------------------------------------------------------- +bool wxFile::ReadAll(wxString *str, const wxMBConv& conv) +{ + wxCHECK_MSG( str, false, wxS("Output string must be non-NULL") ); + + ssize_t length = Length(); + wxCHECK_MSG( (wxFileOffset)length == Length(), false, wxT("huge file not supported") ); + + wxCharBuffer buf(length); + char* p = buf.data(); + for ( ;; ) + { + static const unsigned READSIZE = 4096; + + ssize_t nread = Read(p, length > READSIZE ? READSIZE : length); + if ( nread == wxInvalidOffset ) + return false; + + p += nread; + if ( length <= nread ) + break; + + length -= nread; + } + + *p = 0; + + wxString strTmp(buf, conv); + str->swap(strTmp); + + return true; +} + // read -off_t wxFile::Read(void *pBuf, off_t nCount) +ssize_t wxFile::Read(void *pBuf, size_t nCount) { - wxCHECK( (pBuf != NULL) && IsOpened(), 0 ); - - int iRc = ::read(m_fd, pBuf, nCount); - if ( iRc == -1 ) { - wxLogSysError("can't read from file descriptor %d", m_fd); - return ofsInvalid; - } - else - return (uint)iRc; + wxCHECK( (pBuf != NULL) && IsOpened(), 0 ); + + ssize_t iRc = wxRead(m_fd, pBuf, nCount); + + if ( CheckForError(iRc) ) + { + wxLogSysError(_("can't read from file descriptor %d"), m_fd); + return wxInvalidOffset; + } + + return iRc; } // write -bool wxFile::Write(const void *pBuf, uint nCount) +size_t wxFile::Write(const void *pBuf, size_t nCount) +{ + wxCHECK( (pBuf != NULL) && IsOpened(), 0 ); + + ssize_t iRc = wxWrite(m_fd, pBuf, nCount); + + if ( CheckForError(iRc) ) + { + wxLogSysError(_("can't write to file descriptor %d"), m_fd); + iRc = 0; + } + + return iRc; +} + +bool wxFile::Write(const wxString& s, const wxMBConv& conv) { - wxCHECK( (pBuf != NULL) && IsOpened(), 0 ); - - int iRc = ::write(m_fd, pBuf, nCount); - if ( iRc == -1 ) { - wxLogSysError("can't write to file descriptor %d", m_fd); - return FALSE; - } - else - return TRUE; + const wxWX2MBbuf buf = s.mb_str(conv); + if ( !buf ) + return false; + +#if wxUSE_UNICODE + const size_t size = buf.length(); +#else + const size_t size = s.length(); +#endif + + return Write(buf, size) == size; } // flush bool wxFile::Flush() { - if ( IsOpened() ) { - // @@@ fsync() is not ANSI (BSDish) -// if ( fsync(m_fd) == -1 ) { // TODO - if (TRUE) { - wxLogSysError("can't flush file descriptor %d", m_fd); - return FALSE; +#ifdef HAVE_FSYNC + // fsync() only works on disk files and returns errors for pipes, don't + // call it then + if ( IsOpened() && GetKind() == wxFILE_KIND_DISK ) + { + if ( CheckForError(wxFsync(m_fd)) ) + { + wxLogSysError(_("can't flush file descriptor %d"), m_fd); + return false; + } } - } +#endif // HAVE_FSYNC - return TRUE; + return true; } // ---------------------------------------------------------------------------- @@ -235,120 +394,129 @@ bool wxFile::Flush() // ---------------------------------------------------------------------------- // seek -off_t wxFile::Seek(off_t ofs, SeekMode mode) +wxFileOffset wxFile::Seek(wxFileOffset ofs, wxSeekMode mode) { - wxASSERT( IsOpened() ); - - int flag = -1; - switch ( mode ) { - case FromStart: - flag = SEEK_SET; - break; - - case FromCurrent: - flag = SEEK_CUR; - break; - - case FromEnd: - flag = SEEK_END; - break; - - default: - wxFAIL_MSG("unknown seek origin"); - } - - int iRc = lseek(m_fd, ofs, flag); - if ( iRc == -1 ) { - wxLogSysError("can't seek on file descriptor %d", m_fd); - return ofsInvalid; - } - else - return (off_t)iRc; + wxASSERT_MSG( IsOpened(), wxT("can't seek on closed file") ); + wxCHECK_MSG( ofs != wxInvalidOffset || mode != wxFromStart, + wxInvalidOffset, + wxT("invalid absolute file offset") ); + + int origin; + switch ( mode ) { + default: + wxFAIL_MSG(wxT("unknown seek origin")); + + case wxFromStart: + origin = SEEK_SET; + break; + + case wxFromCurrent: + origin = SEEK_CUR; + break; + + case wxFromEnd: + origin = SEEK_END; + break; + } + + wxFileOffset iRc = wxSeek(m_fd, ofs, origin); + if ( CheckForError(iRc) ) + { + wxLogSysError(_("can't seek on file descriptor %d"), m_fd); + } + + return iRc; } -// get current off_t -off_t wxFile::Tell() const +// get current file offset +wxFileOffset wxFile::Tell() const { - wxASSERT( IsOpened() ); - - int iRc = tell(m_fd); - if ( iRc == -1 ) { - wxLogSysError("can't get seek position on file descriptor %d", m_fd); - return ofsInvalid; - } - else - return (off_t)iRc; + wxASSERT( IsOpened() ); + + wxFileOffset iRc = wxTell(m_fd); + if ( CheckForError(iRc) ) + { + wxLogSysError(_("can't get seek position on file descriptor %d"), m_fd); + } + + return iRc; } // get current file length -off_t wxFile::Length() const +wxFileOffset wxFile::Length() const { - wxASSERT( IsOpened() ); - - #ifdef _MSC_VER - int iRc = _filelength(m_fd); - #else - int iRc = tell(m_fd); - if ( iRc != -1 ) { - // @ have to use const_cast :-( - int iLen = ((wxFile *)this)->SeekEnd(); - if ( iLen != -1 ) { - // restore old position - if ( ((wxFile *)this)->Seek(iRc) == -1 ) { - // error - iLen = -1; + wxASSERT( IsOpened() ); + + // we use a special method for Linux systems where files in sysfs (i.e. + // those under /sys typically) return length of 4096 bytes even when + // they're much smaller -- this is a problem as it results in errors later + // when we try reading 4KB from them +#ifdef __LINUX__ + struct stat st; + if ( fstat(m_fd, &st) == 0 ) + { + // returning 0 for the special files indicates to the caller that they + // are not seekable + return st.st_blocks ? st.st_size : 0; + } + //else: failed to stat, try the normal method +#endif // __LINUX__ + + wxFileOffset iRc = Tell(); + if ( iRc != wxInvalidOffset ) { + wxFileOffset iLen = const_cast(this)->SeekEnd(); + if ( iLen != wxInvalidOffset ) { + // restore old position + if ( ((wxFile *)this)->Seek(iRc) == wxInvalidOffset ) { + // error + iLen = wxInvalidOffset; + } } - } - iRc = iLen; + iRc = iLen; } - #endif //_MSC_VER + if ( iRc == wxInvalidOffset ) + { + // last error was already set by Tell() + wxLogSysError(_("can't find length of file on file descriptor %d"), m_fd); + } - if ( iRc == -1 ) { - wxLogSysError("can't find length of file on file descriptor %d", m_fd); - return ofsInvalid; - } - else - return (off_t)iRc; + return iRc; } // is end of file reached? bool wxFile::Eof() const { - wxASSERT( IsOpened() ); + wxASSERT( IsOpened() ); - int iRc; + wxFileOffset iRc; - #if defined(__UNIX__) || defined(__GNUWIN32__) +#if defined(__DOS__) || defined(__UNIX__) || defined(__GNUWIN32__) // @@ this doesn't work, of course, on unseekable file descriptors - off_t ofsCur = Tell(), - ofsMax = Length(); - if ( ofsCur == ofsInvalid || ofsMax == ofsInvalid ) - iRc = -1; + wxFileOffset ofsCur = Tell(), + ofsMax = Length(); + if ( ofsCur == wxInvalidOffset || ofsMax == wxInvalidOffset ) + iRc = wxInvalidOffset; else - iRc = ofsCur == ofsMax; - #else // Windows and "native" compiler - iRc = eof(m_fd); - #endif // Windows/Unix + iRc = ofsCur == ofsMax; +#else // Windows and "native" compiler + iRc = wxEof(m_fd); +#endif // Windows/Unix - switch ( iRc ) { - case 1: - break; + if ( iRc == 0 ) + return false; - case 0: - return FALSE; - - case -1: - wxLogSysError("can't determine if the end of file is reached on " - "descriptor %d", m_fd); - break; - - default: - wxFAIL_MSG("invalid eof() return value."); - } + if ( iRc == wxInvalidOffset ) + { + wxLogSysError(_("can't determine if the end of file is reached on descriptor %d"), m_fd); + } + else if ( iRc != 1 ) + { + wxFAIL_MSG(wxT("invalid eof() return value.")); + } - return TRUE; + return true; } // ============================================================================ @@ -358,29 +526,64 @@ bool wxFile::Eof() const // ---------------------------------------------------------------------------- // construction // ---------------------------------------------------------------------------- + wxTempFile::wxTempFile(const wxString& strName) { - Open(strName); + Open(strName); } bool wxTempFile::Open(const wxString& strName) { - m_strName = strName; - - // we want to create the file in the same directory as strName because - // otherwise rename() in Commit() might not work (if the files are on - // different partitions for example). Unfortunately, the only standard - // (POSIX) temp file creation function tmpnam() can't do it. - #ifdef __UNIX__ - static const char *szMktempSuffix = "XXXXXX"; - m_strTemp << strName << szMktempSuffix; - mktemp((char *)m_strTemp.c_str()); // @@@ even if the length doesn't change - //m_strTemp.UngetWriteBuf(); - #else // Windows - m_strTemp = tmpnam(NULL); - #endif // Windows/Unix - - return m_file.Open(m_strTemp, wxFile::write); + // we must have an absolute filename because otherwise CreateTempFileName() + // would create the temp file in $TMP (i.e. the system standard location + // for the temp files) which might be on another volume/drive/mount and + // wxRename()ing it later to m_strName from Commit() would then fail + // + // with the absolute filename, the temp file is created in the same + // directory as this one which ensures that wxRename() may work later + wxFileName fn(strName); + if ( !fn.IsAbsolute() ) + { + fn.Normalize(wxPATH_NORM_ABSOLUTE); + } + + m_strName = fn.GetFullPath(); + + m_strTemp = wxFileName::CreateTempFileName(m_strName, &m_file); + + if ( m_strTemp.empty() ) + { + // CreateTempFileName() failed + return false; + } + +#ifdef __UNIX__ + // the temp file should have the same permissions as the original one + mode_t mode; + + wxStructStat st; + if ( stat( (const char*) m_strName.fn_str(), &st) == 0 ) + { + mode = st.st_mode; + } + else + { + // file probably didn't exist, just give it the default mode _using_ + // user's umask (new files creation should respect umask) + mode_t mask = umask(0777); + mode = 0666 & ~mask; + umask(mask); + } + + if ( chmod( (const char*) m_strTemp.fn_str(), mode) == -1 ) + { +#ifndef __OS2__ + wxLogSysError(_("Failed to set temporary file permissions")); +#endif + } +#endif // Unix + + return true; } // ---------------------------------------------------------------------------- @@ -389,30 +592,35 @@ bool wxTempFile::Open(const wxString& strName) wxTempFile::~wxTempFile() { - if ( IsOpened() ) - Discard(); + if ( IsOpened() ) + Discard(); } bool wxTempFile::Commit() { - m_file.Close(); + m_file.Close(); - if ( wxFile::Exists(m_strName) && remove(m_strName) != 0 ) { - wxLogSysError("can't remove file '%s'", m_strName.c_str()); - return FALSE; - } + if ( wxFile::Exists(m_strName) && wxRemove(m_strName) != 0 ) { + wxLogSysError(_("can't remove file '%s'"), m_strName.c_str()); + return false; + } - if ( rename(m_strTemp, m_strName) != 0 ) { - wxLogSysError("can't commit changes to file '%s'", m_strName.c_str()); - return FALSE; - } + if ( !wxRenameFile(m_strTemp, m_strName) ) { + wxLogSysError(_("can't commit changes to file '%s'"), m_strName.c_str()); + return false; + } - return TRUE; + return true; } void wxTempFile::Discard() { - m_file.Close(); - if ( remove(m_strTemp) != 0 ) - wxLogSysError("can't remove temporary file '%s'", m_strTemp.c_str()); + m_file.Close(); + if ( wxRemove(m_strTemp) != 0 ) + { + wxLogSysError(_("can't remove temporary file '%s'"), m_strTemp.c_str()); + } } + +#endif // wxUSE_FILE +