326 lines
10 KiB
C
326 lines
10 KiB
C
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/***
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*tempnam.c - generate unique file name
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*
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* Copyright (c) 1986-2001, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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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 changed directory of last resort from \tmp to tmp.
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* eliminated use of L_tmpnam (it was incoorectly defined
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* in stdio.h and should not be used in tempnam; see
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* System V definition of tempnam.
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* 04-23-86 TC changed last try directory from tmp to current directory
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* 04-29-86 JMB bug fix: pfxlength was being set from strlen(pfx)
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* even if pfx was NULL. Fixed to set pfxlength to zero
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* if pfx is NULL, strlen(pfx) otherwise.
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* 05-28-86 TC changed stat's to access's, and optimized code a bit
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* 12-01-86 JMB added support for Kanji file names until KANJI switch
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* 12-15-86 JMB free malloced memory if (++_tmpoff == first)
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* 07-15-87 JCR Re-init _tempoff based on length of pfx (fixes infinate
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* loop bug; also, tempnam() now uses _tempoff instead of
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* _tmpoff (used by tmpnam()).
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* 10-16-87 JCR Fixed bug in _tempoff re-init code if pfx is NULL.
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* 11-09-87 JCR Multi-thread version
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* 12-11-87 JCR Added "_LOAD_DS" to declaration
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* 05-27-88 PHG Merged DLL and normal versions
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* 06-09-89 GJF Propagated MT's change of 05-17-89 (Kanji)
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* 02-16-90 GJF Fixed copyright and indents
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* 03-19-90 GJF Replaced _LOAD_DS and _CALLTYPE1 and added #include
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* <cruntime.h>.
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* 03-26-90 GJF Added #include <io.h>.
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* 08-13-90 SBM Compiles cleanly with -W3, replaced explicit register
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* declarations by REGn references
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* 10-03-90 GJF New-style function declarator.
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* 01-21-91 GJF ANSI naming.
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* 08-19-91 JCR Allow quotes in TMP variable path
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* 08-27-91 JCR ANSI naming
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* 08-25-92 GJF Don't build for POSIX.
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* 11-30-92 KRS Generalize KANJI support to MBCS. Port 16-bit bug fix.
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* 04-06-93 SKS Replace _CRTAPI* with __cdecl
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* 12-07-93 CFW Wide char enable.
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* 01-10-95 CFW Debug CRT allocs.
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* 01-23-95 CFW Debug: tempnam return freed by user.
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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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* 03-10-95 CFW Made _tempnam() parameters const.
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* 03-14-95 JCF Made pfin _TSCHAR for the Mac.
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* 07-30-96 GJF Allow longer file names and changed the way we ensure
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* a file name is not too long. In particular, this
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* corrects the absurdly long loop (appeared infinite to
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* to users) which occurred when the user supplied prefix
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* was too long. Also, cleaned up the format a bit.
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* 03-04-98 GJF Exception-safe locking.
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* 01-04-99 GJF Changes for 64-bit size_t.
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* 05-17-99 PML Remove all Macintosh support.
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* 12-10-00 PML Fix double-free of qptr when _stripquote succeeds but
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* result isn't a valid directory (vs7#5416).
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* 02-20-01 PML vs7#172586 Avoid _RT_LOCK by preallocating all locks
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* that will be required, and returning failure back on
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* inability to allocate a lock.
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* 07-07-01 BWT Initialize 's' in tempnam - in case the done2 branch is taken,
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* 's' must be something reasonable.
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*
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*******************************************************************************/
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#ifndef _POSIX_
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#include <cruntime.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <io.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <malloc.h>
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#include <string.h>
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#include <internal.h>
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#include <mtdll.h>
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#include <tchar.h>
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#include <dbgint.h>
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#ifdef _MBCS
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#include <mbstring.h>
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#endif
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/* local tchar */
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#ifdef _UNICODE
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#define _tP_tmpdir _wP_tmpdir
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#else
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#define _tP_tmpdir _P_tmpdir
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#endif
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#ifdef _UNICODE
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static wchar_t * _wstripquote (wchar_t *);
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#else
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static char * _stripquote (char *);
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#endif
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/***
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*_TSCHAR *_tempnam(dir, prefix) - create unique file name
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*
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*Purpose:
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* Create a file name that is unique in the specified directory.
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* The semantics of directory specification is as follows:
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* Use the directory specified by the TMP environment variable
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* if that exists, else use the dir argument if non-NULL, else
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* use _P_tmpdir if that directory exists, else use the current
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* working directory), else return NULL.
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*
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*Entry:
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* _TSCHAR *dir - directory to be used for temp file if TMP env var
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* not set
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* _TSCHAR *prefix - user provided prefix for temp file name
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*
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*Exit:
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* returns ptr to constructed file name if successful
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* returns NULL if unsuccessful
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*
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*Exceptions:
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*
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*******************************************************************************/
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_TSCHAR * __cdecl _ttempnam (
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const _TSCHAR *dir,
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const _TSCHAR *pfx
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)
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{
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REG1 _TSCHAR *ptr;
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REG2 unsigned int pfxlength = 0;
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_TSCHAR *s = NULL;
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_TSCHAR *pfin;
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unsigned int first;
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unsigned int bufsz;
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_TSCHAR * qptr = NULL; /* ptr to TMP path with quotes stripped out */
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#ifdef _MT
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if ( !_mtinitlocknum( _TMPNAM_LOCK ))
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return NULL;
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#endif
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/* try TMP path */
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if ( ( ptr = _tgetenv( _T("TMP") ) ) && ( _taccess( ptr, 0 ) != -1 ) )
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dir = ptr;
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/* try stripping quotes out of TMP path */
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#ifdef _UNICODE
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else if ( (ptr != NULL) && (qptr = _wstripquote(ptr)) &&
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#else
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else if ( (ptr != NULL) && (qptr = _stripquote(ptr)) &&
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#endif
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(_taccess(qptr, 0) != -1 ) )
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dir = qptr;
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/* TMP path not available, use alternatives */
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else if (!( dir != NULL && ( _taccess( dir, 0 ) != -1 ) ) )
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/* do not "simplify" this depends on side effects!! */
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{
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if ( _taccess( _tP_tmpdir, 0 ) != -1 )
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dir = _tP_tmpdir;
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else
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dir = _T(".");
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}
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if (pfx)
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pfxlength = (unsigned)_tcslen(pfx);
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if ( ((bufsz = (unsigned)_tcslen(dir) + pfxlength + 12) > FILENAME_MAX) ||
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((s = malloc(bufsz * sizeof(_TSCHAR))) == NULL) )
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/* the 12 above allows for a backslash, 10 char temp string and
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a null terminator */
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{
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goto done2;
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}
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*s = _T('\0');
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_tcscat( s, dir );
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pfin = (_TSCHAR *)&(dir[ _tcslen( dir ) - 1 ]);
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#ifdef _MBCS
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if (*pfin == '\\') {
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if (pfin != _mbsrchr(dir,'\\'))
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/* *pfin is second byte of a double-byte char */
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strcat( s, "\\" );
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}
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else if (*pfin != '/')
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strcat( s, "\\" );
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#else
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if ( ( *pfin != _T('\\') ) && ( *pfin != _T('/') ) )
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{
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_tcscat( s, _T("\\") );
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}
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#endif
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if ( pfx != NULL )
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{
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_tcscat( s, pfx );
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}
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ptr = &s[_tcslen( s )];
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/*
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Re-initialize _tempoff if necessary. If we don't re-init _tempoff, we
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can get into an infinate loop (e.g., (a) _tempoff is a big number on
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entry, (b) prefix is a long string (e.g., 8 chars) and all tempfiles
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with that prefix exist, (c) _tempoff will never equal first and we'll
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loop forever).
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[NOTE: To avoid a conflict that causes the same bug as that discussed
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above, _tempnam() uses _tempoff; tmpnam() uses _tmpoff]
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*/
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#ifdef _MT
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_mlock(_TMPNAM_LOCK); /* Lock access to _old_pfxlen and _tempoff */
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__try {
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#endif
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if (_old_pfxlen < pfxlength)
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_tempoff = 1;
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_old_pfxlen = pfxlength;
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first = _tempoff;
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do {
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if ( (++_tempoff - first) > TMP_MAX ) {
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free(s);
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s = NULL;
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goto done1;
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}
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/* the maximum length string returned by _ultot is 10 chars
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(assuming 32-bit unsigned long) so there is enough room in
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the tail of s (pointed to by ptr) for it */
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_ultot( (unsigned long)_tempoff, ptr, 10 );
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}
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while ( (_taccess( s, 0 ) == 0 ) || (errno == EACCES) );
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/* Common return */
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done1:
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#ifdef _MT
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; }
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__finally {
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_munlock(_TMPNAM_LOCK); /* release tempnam lock */
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}
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#endif
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done2:
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_free_crt(qptr); /* free temp ptr, if non-NULL */
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return(s);
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}
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/***
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*_stripquote() - Strip quotes out of a string
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*
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*Purpose:
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* This routine strips quotes out of a string. This is necessary
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* in the case where a file/path name has embedded quotes (i.e.,
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* new file system.)
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*
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* For example,
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* c:\tmp\"a b c"\d --> c:\tmp\a b d\d
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*
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* NOTE: This routine makes a copy of the string since it may be
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* passed a pointer to an environment variable that shouldn't be
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* changed. It is up to the caller to free up the memory (if the
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* return value is non-NULL).
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*
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*Entry:
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* _TSCHAR * ptr = pointer to string
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*
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*Exit:
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* _TSCHAR * ptr = pointer to copy of string with quotes gone.
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* NULL = no quotes in string.
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*
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*Exceptions:
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*
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*******************************************************************************/
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#ifdef _UNICODE
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static wchar_t * _wstripquote (
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#else
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static char * _stripquote (
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#endif
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_TSCHAR * src
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)
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{
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_TSCHAR * dst;
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_TSCHAR * ret;
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unsigned int q = 0;
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/* get a buffer for the new string */
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if ((dst = _malloc_crt((_tcslen(src)+1) * sizeof(_TSCHAR))) == NULL)
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return(NULL);
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/* copy the string stripping out the quotes */
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ret = dst; /* save base ptr */
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while (*src) {
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if (*src == _T('\"')) {
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src++; q++;
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}
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else
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*dst++ = *src++;
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}
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if (q) {
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*dst = _T('\0'); /* final nul */
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return(ret);
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}
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else {
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_free_crt(ret);
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return(NULL);
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}
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}
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#endif /* _POSIX_ */
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