520 lines
14 KiB
C
520 lines
14 KiB
C
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/***
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*tmpfile.c - create unique file name or file
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*
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* Copyright (c) 1985-2001, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* defines tmpnam() and tmpfile().
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*
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*Revision History:
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* ??-??-?? TC initial version
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* 04-17-86 JMB tmpnam - brought semantics in line with System V
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* definition as follows: 1) if tmpnam paramter is NULL,
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* store name in static buffer (do NOT use malloc); (2)
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* use P_tmpdir as the directory prefix to the temp file
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* name (do NOT use current working directory)
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* 05-26-87 JCR fixed bug where tmpnam was modifying errno
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* 08-10-87 JCR Added code to support P_tmpdir with or without trailing
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* '\'.
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* 11-09-87 JCR Multi-thread support
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* 12-11-87 JCR Added "_LOAD_DS" to declaration
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* 01-22-88 JCR Added per thread static namebuf area (mthread bug fix)
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* 05-27-88 PHG Merged DLL/normal versions
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* 11-14-88 GJF _openfile() now takes a file sharing flag, also some
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* cleanup (now specific to the 386)
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* 06-06-89 JCR 386 mthread support
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* 11-28-89 JCR Added check to _tmpnam so it can't loop forever
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* 02-16-90 GJF Fixed copyright and indents
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* 03-19-90 GJF Replaced _LOAD_DS with _CALLTYPE1, added #include
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* <cruntime.h> and removed #include <register.h>.
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* 03-26-90 GJF Added #include <io.h>.
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* 10-03-90 GJF New-style function declarators.
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* 01-21-91 GJF ANSI naming.
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* 07-22-91 GJF Multi-thread support for Win32 [_WIN32_].
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* 03-17-92 GJF Completely rewrote Win32 version.
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* 03-27-92 DJM POSIX support.
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* 05-02-92 SRW Use _O_TEMPORARY flag for tmpfile routine.
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* 05-04-92 GJF Force cinittmp.obj in for Win32.
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* 08-26-92 GJF Fixed POSIX build.
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* 08-28-92 GJF Oops, forgot about getpid...
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* 11-06-92 GJF Use '/' for POSIX, '\\' otherwise, as the path
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* separator. Also, backed out JHavens' bug fix of 6-14,
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* which was itself a bug (albeit a less serious one).
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* 02-26-93 GJF Put in per-thread buffers, purged Cruiser support.
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* 04-06-93 SKS Replace _CRTAPI* with __cdecl
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* 04-07-93 SKS Replace access() with ANSI-conforming _access()
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* 04-22-93 GJF Fixed bug in multi-thread - multiple threads calling
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* tmpnam would get the same names. Also, went to static
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* namebufX buffers since failing due to a failed malloc
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* would violate ANSI.
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* 04-29-93 GJF Multi-thread bug in tmpnam() - forgot to copy the
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* generated name to the per-thread buffer.
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* 12-07-93 CFW Wide char enable.
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* 04-01-94 GJF #ifdef-ed out __inc_tmpoff for msvcrt*.dll, it's
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* unnecessary.
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* 04-22-94 GJF Made definitions of namebuf0 and namebuf1 conditional
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* on DLL_FOR_WIN32S.
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* 01-10-95 CFW Debug CRT allocs.
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* 01-18-95 GJF Must replace _tcsdup with _malloc_crt/_tcscpy for
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* _DEBUG build.
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* 02-21-95 GJF Appended Mac version of source file (somewhat cleaned
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* up), with appropriate #ifdef-s. Also replaced WPRFLAG
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* with _UNICODE.
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* 03-07-95 GJF _[un]lock_str macros now take FILE * arg.
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* 08-08-97 GJF Removed initialized-but-unused local variable from
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* tmpfile(). Also, detab-ed.
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* 03-03-98 GJF Exception-safe locking.
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* 05-13-99 PML Remove Win32s
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* 05-17-99 PML Remove all Macintosh support.
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* 10-06-99 PML Set errno EMFILE when out of streams.
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* 07-03-01 BWT Fix genfname to use the correct buffer size to encode a dword (7 bytes + NULL).
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*
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*******************************************************************************/
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#include <cruntime.h>
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#ifdef _POSIX_
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#include <unistd.h>
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#endif
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#include <errno.h>
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#include <process.h>
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#include <fcntl.h>
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#include <io.h>
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#include <mtdll.h>
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#include <share.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <file2.h>
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#include <internal.h>
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#include <tchar.h>
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#include <dbgint.h>
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/*
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* Buffers used by tmpnam() and tmpfile() to build filenames.
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*/
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static _TSCHAR namebuf0[L_tmpnam] = { 0 }; /* used by tmpnam() */
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static _TSCHAR namebuf1[L_tmpnam] = { 0 }; /* used by tmpfile() */
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/*
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* Initializing function for namebuf0 and namebuf1.
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*/
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#ifdef _UNICODE
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static void __cdecl winit_namebuf(int);
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#else
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static void __cdecl init_namebuf(int);
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#endif
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/*
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* Generator function that produces temporary filenames
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*/
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#ifdef _UNICODE
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static int __cdecl wgenfname(wchar_t *);
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#else
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static int __cdecl genfname(char *);
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#endif
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/***
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*_TSCHAR *tmpnam(_TSCHAR *s) - generate temp file name
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*
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*Purpose:
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* Creates a file name that is unique in the directory specified by
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* _P_tmpdir in stdio.h. Places file name in string passed by user or
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* in static mem if pass NULL.
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*
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*Entry:
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* _TSCHAR *s - ptr to place to put temp name
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*
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*Exit:
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* returns pointer to constructed file name (s or address of static mem)
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* returns NULL if fails
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*
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*Exceptions:
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*
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*******************************************************************************/
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_TSCHAR * __cdecl _ttmpnam (
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_TSCHAR *s
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)
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{
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_TSCHAR *pfnam = NULL;
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#ifdef _MT
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_ptiddata ptd;
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if ( !_mtinitlocknum( _TMPNAM_LOCK ))
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return NULL;
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_mlock(_TMPNAM_LOCK);
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__try {
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#endif
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/*
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* Initialize namebuf0, if needed. Otherwise, call genfname() to
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* generate the next filename.
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*/
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if ( *namebuf0 == 0 ) {
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#ifdef _UNICODE
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winit_namebuf(0);
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#else
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init_namebuf(0);
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#endif
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}
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#ifdef _UNICODE
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else if ( wgenfname(namebuf0) )
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#else
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else if ( genfname(namebuf0) )
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#endif
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goto tmpnam_err;
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/*
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* Generate a filename that doesn't already exist.
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*/
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while ( _taccess(namebuf0, 0) == 0 )
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#ifdef _UNICODE
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if ( wgenfname(namebuf0) )
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#else
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if ( genfname(namebuf0) )
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#endif
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goto tmpnam_err;
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/*
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* Filename has successfully been generated.
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*/
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if ( s == NULL )
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#ifdef _MT
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{
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/*
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* Use a per-thread buffer to hold the generated file name.
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* If there isn't one, and one cannot be created, just use
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* namebuf0.
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*/
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ptd = _getptd();
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#ifdef _UNICODE
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if ( (ptd->_wnamebuf0 != NULL) || ((ptd->_wnamebuf0 =
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_malloc_crt(L_tmpnam * sizeof(wchar_t))) != NULL) )
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{
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s = ptd->_wnamebuf0;
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wcscpy(s, namebuf0);
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}
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#else
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if ( (ptd->_namebuf0 != NULL) || ((ptd->_namebuf0 =
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_malloc_crt(L_tmpnam)) != NULL) )
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{
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s = ptd->_namebuf0;
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strcpy(s, namebuf0);
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}
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#endif
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else
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s = namebuf0;
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}
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#else
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s = namebuf0;
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#endif
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else
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_tcscpy(s, namebuf0);
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pfnam = s;
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/*
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* All errors come here.
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*/
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tmpnam_err:
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#ifdef _MT
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; }
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__finally {
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_munlock(_TMPNAM_LOCK);
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}
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#endif
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return pfnam;
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}
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#ifndef _UNICODE
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/***
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*FILE *tmpfile() - create a temporary file
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*
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*Purpose:
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* Creates a temporary file with the file mode "w+b". The file
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* will be automatically deleted when closed or the program terminates
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* normally.
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*
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*Entry:
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* None.
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*
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*Exit:
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* Returns stream pointer to opened file.
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* Returns NULL if fails
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*
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*Exceptions:
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*
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*******************************************************************************/
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FILE * __cdecl tmpfile (
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void
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)
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{
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FILE *stream;
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FILE *return_stream = NULL;
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int fh;
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#ifdef _MT
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int stream_lock_held = 0;
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if ( !_mtinitlocknum( _TMPNAM_LOCK ))
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return NULL;
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_mlock(_TMPNAM_LOCK);
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__try {
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#endif
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/*
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* Initialize namebuf1, if needed. Otherwise, call genfname() to
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* generate the next filename.
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*/
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if ( *namebuf1 == 0 ) {
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init_namebuf(1);
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}
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else if ( genfname(namebuf1) )
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goto tmpfile_err;
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/*
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* Get a free stream.
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*
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* Note: In multi-thread models, the stream obtained below is locked!
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*/
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if ( (stream = _getstream()) == NULL ) {
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errno = EMFILE;
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goto tmpfile_err;
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}
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#ifdef _MT
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stream_lock_held = 1;
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#endif
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/*
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* Create a temporary file.
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*
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* Note: The loop below will only create a new file. It will NOT
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* open and truncate an existing file. Either behavior is probably
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* legal under ANSI (4.9.4.3 says tmpfile "creates" the file, but
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* also says it is opened with mode "wb+"). However, the behavior
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* implemented below is compatible with prior versions of MS-C and
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* makes error checking easier.
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*/
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#ifdef _POSIX_
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while ( ((fh = open(namebuf1,
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O_CREAT | O_EXCL | O_RDWR,
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S_IRUSR | S_IWUSR
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))
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== -1) && (errno == EEXIST) )
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#else
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while ( ((fh = _sopen(namebuf1,
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_O_CREAT | _O_EXCL | _O_RDWR | _O_BINARY |
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_O_TEMPORARY,
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_SH_DENYNO,
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_S_IREAD | _S_IWRITE
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))
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== -1) && (errno == EEXIST) )
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#endif
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if ( genfname(namebuf1) )
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break;
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/*
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* Check that the loop above did indeed create a temporary
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* file.
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*/
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if ( fh == -1 )
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goto tmpfile_err;
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/*
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* Initialize stream
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*/
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#ifdef _DEBUG
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if ( (stream->_tmpfname = _malloc_crt( (_tcslen( namebuf1 ) + 1) *
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sizeof(_TSCHAR) )) == NULL )
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#else /* ndef _DEBUG */
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if ( (stream->_tmpfname = _tcsdup( namebuf1 )) == NULL )
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#endif /* _DEBUG */
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{
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/* close the file, then branch to error handling */
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#ifdef _POSIX_
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close(fh);
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#else
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_close(fh);
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#endif
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goto tmpfile_err;
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}
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#ifdef _DEBUG
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_tcscpy( stream->_tmpfname, namebuf1 );
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#endif /* _DEBUG */
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stream->_cnt = 0;
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stream->_base = stream->_ptr = NULL;
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stream->_flag = _commode | _IORW;
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stream->_file = fh;
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return_stream = stream;
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/*
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* All errors branch to the label below.
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*/
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tmpfile_err:
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#ifdef _MT
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; }
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__finally {
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if ( stream_lock_held )
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_unlock_str(stream);
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_munlock(_TMPNAM_LOCK);
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}
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#endif
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return return_stream;
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}
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#endif /* _UNICODE */
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/***
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*static void init_namebuf(flag) - initializes the namebuf arrays
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*
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*Purpose:
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* Called once each for namebuf0 and namebuf1, to initialize
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* them.
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|
|
*
|
||
|
|
*Entry:
|
||
|
|
* int flag - flag set to 0 if namebuf0 is to be initialized,
|
||
|
|
* non-zero (1) if namebuf1 is to be initialized.
|
||
|
|
*Exit:
|
||
|
|
*
|
||
|
|
*Exceptions:
|
||
|
|
*
|
||
|
|
*******************************************************************************/
|
||
|
|
|
||
|
|
#ifdef _UNICODE
|
||
|
|
static void __cdecl winit_namebuf(
|
||
|
|
#else
|
||
|
|
static void __cdecl init_namebuf(
|
||
|
|
#endif
|
||
|
|
int flag
|
||
|
|
)
|
||
|
|
{
|
||
|
|
_TSCHAR *p, *q;
|
||
|
|
|
||
|
|
if ( flag == 0 )
|
||
|
|
p = namebuf0;
|
||
|
|
else
|
||
|
|
p = namebuf1;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Put in the path prefix. Make sure it ends with a slash or
|
||
|
|
* backslash character.
|
||
|
|
*/
|
||
|
|
#ifdef _UNICODE
|
||
|
|
wcscpy(p, _wP_tmpdir);
|
||
|
|
#else
|
||
|
|
strcpy(p, _P_tmpdir);
|
||
|
|
#endif
|
||
|
|
q = p + sizeof(_P_tmpdir) - 1; /* same as p + _tcslen(p) */
|
||
|
|
|
||
|
|
#ifdef _POSIX_
|
||
|
|
if ( *(q - 1) != _T('/') )
|
||
|
|
*(q++) = _T('/');
|
||
|
|
#else
|
||
|
|
if ( (*(q - 1) != _T('\\')) && (*(q - 1) != _T('/')) )
|
||
|
|
*(q++) = _T('\\');
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Append the leading character of the filename.
|
||
|
|
*/
|
||
|
|
if ( flag )
|
||
|
|
/* for tmpfile() */
|
||
|
|
*(q++) = _T('t');
|
||
|
|
else
|
||
|
|
/* for tmpnam() */
|
||
|
|
*(q++) = _T('s');
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Append the process id, encoded in base 32. Note this makes
|
||
|
|
* p back into a string again (i.e., terminated by a '\0').
|
||
|
|
*/
|
||
|
|
#ifdef _POSIX_
|
||
|
|
_ultot((unsigned long)getpid(), q, 32);
|
||
|
|
#else
|
||
|
|
_ultot((unsigned long)_getpid(), q, 32);
|
||
|
|
#endif
|
||
|
|
_tcscat(p, _T("."));
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/***
|
||
|
|
*static int genfname(_TSCHAR *fname) -
|
||
|
|
*
|
||
|
|
*Purpose:
|
||
|
|
*
|
||
|
|
*Entry:
|
||
|
|
*
|
||
|
|
*Exit:
|
||
|
|
*
|
||
|
|
*Exceptions:
|
||
|
|
*
|
||
|
|
*******************************************************************************/
|
||
|
|
|
||
|
|
#ifdef _UNICODE
|
||
|
|
static int __cdecl wgenfname (
|
||
|
|
#else
|
||
|
|
static int __cdecl genfname (
|
||
|
|
#endif
|
||
|
|
_TSCHAR *fname
|
||
|
|
)
|
||
|
|
{
|
||
|
|
_TSCHAR *p;
|
||
|
|
_TSCHAR pext[8]; // 7 positions for base 32 ulong + null terminator
|
||
|
|
unsigned long extnum;
|
||
|
|
|
||
|
|
p = _tcsrchr(fname, _T('.'));
|
||
|
|
|
||
|
|
p++;
|
||
|
|
|
||
|
|
if ( (extnum = _tcstoul(p, NULL, 32) + 1) >= (unsigned long)TMP_MAX )
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
_tcscpy(p, _ultot(extnum, pext, 32));
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
#if !defined(_UNICODE) && !defined(CRTDLL)
|
||
|
|
|
||
|
|
/***
|
||
|
|
*void __inc_tmpoff(void) - force external reference for _tmpoff
|
||
|
|
*
|
||
|
|
*Purpose:
|
||
|
|
* Forces an external reference to be generate for _tmpoff, which is
|
||
|
|
* is defined in cinittmp.obj. This has the forces cinittmp.obj to be
|
||
|
|
* pulled in, making a call to rmtmp part of the termination.
|
||
|
|
*
|
||
|
|
*Entry:
|
||
|
|
*
|
||
|
|
*Exit:
|
||
|
|
*
|
||
|
|
*Exceptions:
|
||
|
|
*
|
||
|
|
*******************************************************************************/
|
||
|
|
|
||
|
|
|
||
|
|
extern int _tmpoff;
|
||
|
|
|
||
|
|
void __inc_tmpoff(
|
||
|
|
void
|
||
|
|
)
|
||
|
|
{
|
||
|
|
_tmpoff++;
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif /* _UNICODE */
|