X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/3f4a0c5be34be837210768501c13dbcff81e533c..b4c470164c9e273222715eed7edb0d1334efc5f2:/src/common/file.cpp diff --git a/src/common/file.cpp b/src/common/file.cpp index 127a04feb4..f3f5025973 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 @@ -7,140 +7,132 @@ // 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 -// standard -#if defined(__WXMSW__) && !defined(__GNUWIN32__) - #include - -#ifndef __SALFORDC__ - #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 -#endif +#if wxUSE_FILE - #include // for GetTempFileName +// standard +#if defined(__WXMSW__) && !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(__WXMSW__) && defined(__WXWINCE__) + #include "wx/msw/missing.h" +#elif (defined(__OS2__)) + #include #elif (defined(__UNIX__) || defined(__GNUWIN32__)) #include + #include + #include #ifdef __GNUWIN32__ - #include + #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 + int _access( const char *path, int mode ) { return 0 ; } +#endif char* mktemp( char * path ) { return path ;} - #include - #include - #define W_OK 2 - #define R_OK 4 + #include + #include +#elif defined(__WXPALMOS__) + #include "wx/palmos/missing.h" #else #error "Please specify the header with file functions declarations." #endif //Win/UNIX #include // SEEK_xxx constants -#include // O_RDONLY &c - -#ifndef __MWERKS__ - #include // needed for stat - #include // stat -#endif -// Microsoft compiler loves underscores, feed them to it -#ifdef __VISUALC__ - // 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 -#else - #define tell(fd) lseek(fd, 0, SEEK_CUR) -#endif // VC++ - -#if defined(__BORLANDC__) || defined(_MSC_VER) - #define W_OK 2 - #define R_OK 4 +#ifndef __WXWINCE__ + #include #endif -// there is no distinction between text and binary files under Unix -#ifdef __UNIX__ - #define O_BINARY (0) +// 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 __SALFORDC__ - #include +#ifdef __WXMSW__ + #include "wx/msw/mslu.h" #endif -// wxWindows -#include -#include -#include -#include +#ifdef __WXWINCE__ + #include "wx/msw/private.h" +#endif #ifndef MAX_PATH #define MAX_PATH 512 #endif -#ifdef __WXMAC__ - char gwxMacFileName[ MAX_PATH ] ; - char gwxMacFileName2[ MAX_PATH ] ; - char gwxMacFileName3[ MAX_PATH ] ; -#endif - // ============================================================================ // implementation of wxFile // ============================================================================ @@ -148,35 +140,36 @@ // ---------------------------------------------------------------------------- // static functions // ---------------------------------------------------------------------------- -bool wxFile::Exists(const char *name) -{ -#ifdef __SALFORDC__ - struct _stat st; -#else - struct stat st; -#endif - return !access(name, 0) && !stat((char*) name, &st) && (st.st_mode & S_IFREG); +bool wxFile::Exists(const wxString& name) +{ + return wxFileExists(name); } -bool wxFile::Access(const char *name, OpenMode mode) +bool wxFile::Access(const wxString& name, OpenMode mode) { - int how = 0; + int how; - switch ( mode ) { - case read: - how = R_OK; - break; + switch ( mode ) + { + default: + wxFAIL_MSG(wxT("bad wxFile::Access mode parameter.")); + // fall through - case write: - how = W_OK; - break; + case read: + how = R_OK; + break; - default: - wxFAIL_MSG("bad wxFile::Access mode parameter."); - } + case write: + how = W_OK; + break; - return access(name, how) == 0; + case read_write: + how = R_OK | W_OK; + break; + } + + return wxAccess(name, how) == 0; } // ---------------------------------------------------------------------------- @@ -184,96 +177,116 @@ bool wxFile::Access(const char *name, OpenMode mode) // ---------------------------------------------------------------------------- // ctors -wxFile::wxFile(const char *szFileName, OpenMode mode) +wxFile::wxFile(const wxString& fileName, OpenMode mode) { - m_fd = fd_invalid; - m_error = FALSE; + 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, int accessMode) +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 -#ifdef __SALFORDC__ - int fd = open(szFileName, O_WRONLY | O_CREAT | - (bOverwrite ? O_TRUNC : O_EXCL)); -#else - int fd = open(szFileName, O_WRONLY | O_CREAT | - (bOverwrite ? O_TRUNC : O_EXCL), accessMode); -#endif + // 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 = wxOpen( fileName, + O_BINARY | O_WRONLY | O_CREAT | + (bOverwrite ? O_TRUNC : O_EXCL), + accessMode ); + if ( CheckForError(fd) ) + { + wxLogSysError(_("can't create file '%s'"), fileName); + return false; + } - if ( fd == -1 ) { - wxLogSysError(_("can't create file '%s'"), szFileName); - return FALSE; - } - else { Attach(fd); - return TRUE; - } + return true; } // open the file -bool wxFile::Open(const char *szFileName, OpenMode mode, int accessMode) +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; + 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; + } - case write_append: - flags |= O_WRONLY | O_APPEND; - 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__ - case read_write: - flags |= O_RDWR; - break; - } + int fd = wxOpen( fileName, flags, accessMode); -#ifdef __SALFORDC__ - int fd = open(szFileName, flags); -#else - int fd = open(szFileName, flags, accessMode); -#endif + if ( CheckForError(fd) ) + { + wxLogSysError(_("can't open file '%s'"), fileName); + return false; + } - if ( fd == -1 ) { - wxLogSysError(_("can't open file '%s'"), szFileName); - return FALSE; - } - else { Attach(fd); - return TRUE; - } + 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; } // ---------------------------------------------------------------------------- @@ -281,58 +294,69 @@ bool wxFile::Close() // ---------------------------------------------------------------------------- // read -off_t wxFile::Read(void *pBuf, off_t nCount) +ssize_t wxFile::Read(void *pBuf, size_t nCount) { - wxCHECK( (pBuf != NULL) && IsOpened(), 0 ); + wxCHECK( (pBuf != NULL) && IsOpened(), 0 ); -#ifdef __MWERKS__ - int iRc = ::read(m_fd, (char*) pBuf, nCount); -#else - int iRc = ::read(m_fd, pBuf, nCount); -#endif - if ( iRc == -1 ) { - wxLogSysError(_("can't read from file descriptor %d"), m_fd); - return wxInvalidOffset; - } - else - return (size_t)iRc; + 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 size_t wxFile::Write(const void *pBuf, size_t nCount) { - wxCHECK( (pBuf != NULL) && IsOpened(), 0 ); + wxCHECK( (pBuf != NULL) && IsOpened(), 0 ); -#ifdef __MWERKS__ - int iRc = ::write(m_fd, (const char*) pBuf, nCount); + 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) +{ + const wxWX2MBbuf buf = s.mb_str(conv); + if ( !buf ) + return false; + +#if wxUSE_UNICODE + const size_t size = buf.length(); #else - int iRc = ::write(m_fd, pBuf, nCount); + const size_t size = s.length(); #endif - if ( iRc == -1 ) { - wxLogSysError(_("can't write to file descriptor %d"), m_fd); - m_error = TRUE; - return 0; - } - else - return iRc; + + return Write(buf, size) == size; } // flush bool wxFile::Flush() { - if ( IsOpened() ) { - #if defined(__VISUALC__) || wxHAVE_FSYNC - if ( fsync(m_fd) == -1 ) +#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; + return false; } - #else // no fsync - // just do nothing - #endif // fsync - } + } +#endif // HAVE_FSYNC - return TRUE; + return true; } // ---------------------------------------------------------------------------- @@ -340,119 +364,129 @@ bool wxFile::Flush() // ---------------------------------------------------------------------------- // seek -off_t wxFile::Seek(off_t ofs, wxSeekMode mode) +wxFileOffset wxFile::Seek(wxFileOffset ofs, wxSeekMode mode) { - wxASSERT( IsOpened() ); - - int flag = -1; - switch ( mode ) { - case wxFromStart: - flag = SEEK_SET; - break; - - case wxFromCurrent: - flag = SEEK_CUR; - break; - - case wxFromEnd: - 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 wxInvalidOffset; - } - 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 wxInvalidOffset; - } - 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 __VISUALC__ - int iRc = _filelength(m_fd); - #else // !VC++ - 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; + } + + if ( iRc == wxInvalidOffset ) + { + // last error was already set by Tell() + wxLogSysError(_("can't find length of file on file descriptor %d"), m_fd); } - #endif // VC++ - - if ( iRc == -1 ) { - wxLogSysError(_("can't find length of file on file descriptor %d"), m_fd); - return wxInvalidOffset; - } - 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__) || defined( __MWERKS__ ) || defined(__SALFORDC__) +#if defined(__DOS__) || defined(__UNIX__) || defined(__GNUWIN32__) || defined( __MWERKS__ ) // @@ this doesn't work, of course, on unseekable file descriptors - off_t ofsCur = Tell(), - ofsMax = Length(); + wxFileOffset ofsCur = Tell(), + ofsMax = Length(); if ( ofsCur == wxInvalidOffset || ofsMax == wxInvalidOffset ) - iRc = -1; + 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; } // ============================================================================ @@ -462,39 +496,64 @@ descriptor %d"), m_fd); // ---------------------------------------------------------------------------- // 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. - #if defined(__UNIX__) || defined(__WXSTUBS__)|| defined( __WXMAC__ ) - static const char *szMktempSuffix = "XXXXXX"; - m_strTemp << strName << szMktempSuffix; - mktemp((char *)m_strTemp.c_str()); // will do because length doesn't change - #else // Windows - wxString strPath; - wxSplitPath(strName, &strPath, NULL, NULL); - if ( strPath.IsEmpty() ) - strPath = '.'; // GetTempFileName will fail if we give it empty string -#ifdef __WIN32__ - if ( !GetTempFileName(strPath, "wx_",0, m_strTemp.GetWriteBuf(MAX_PATH)) ) -#else - // Not sure why MSVC++ 1.5 header defines first param as BYTE - bug? - if ( !GetTempFileName((BYTE) (const char*) strPath, "wx_",0, m_strTemp.GetWriteBuf(MAX_PATH)) ) + // 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 - wxLogLastError("GetTempFileName"); - m_strTemp.UngetWriteBuf(); - #endif // Windows/Unix + } +#endif // Unix - return m_file.Open(m_strTemp, wxFile::write); + return true; } // ---------------------------------------------------------------------------- @@ -503,30 +562,35 @@ 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 +