/*

 * Copyright (c) 1987, 1993

 *	The Regents of the University of California.  All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 3. ***REMOVED*** - see 

 *    ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change

 * 4. Neither the name of the University nor the names of its contributors

 *    may be used to endorse or promote products derived from this software

 *    without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 */

#if defined(LIBC_SCCS) && !defined(lint)

static char sccsid[] = "@(#)mktemp.c	8.1 (Berkeley) 6/4/93";

#endif /* LIBC_SCCS and not lint */

#ifdef macintosh

#include <unix.h>

#else

#include <sys/types.h>

#include <sys/stat.h>

#endif

#include <fcntl.h>

#include <errno.h>

#include <stdio.h>

#include <ctype.h>

#include "mcom_db.h"

#ifndef _WINDOWS

#include <unistd.h>

#endif

#ifdef _WINDOWS

#include <process.h>

#include "winfile.h"

#endif

static int _gettemp(char *path, register int *doopen, int extraFlags);

int

mkstemp(char *path)

{

#ifdef XP_OS2

	FILE *temp = tmpfile();

	return (temp ? fileno(temp) : -1);

#else

	int fd;

	return (_gettemp(path, &fd, 0) ? fd : -1);

#endif

}

int

mkstempflags(char *path, int extraFlags)

{

	int fd;

	return (_gettemp(path, &fd, extraFlags) ? fd : -1);

}

/* NB: This routine modifies its input string, and does not always restore it.

** returns 1 on success, 0 on failure.

*/

static int 

_gettemp(char *path, register int *doopen, int extraFlags)

{    

	register char *start, *trv;

	struct stat sbuf;

	unsigned int pid;

	pid = getpid();

	for (trv = path; *trv; ++trv);		/* extra X's get set to 0's */

	while (*--trv == 'X') {

		*trv = (pid % 10) + '0';

		pid /= 10;

	}

	/*

	 * check the target directory; if you have six X's and it

	 * doesn't exist this runs for a *very* long time.

	 */

	for (start = trv + 1;; --trv) {

		char saved;

		if (trv <= path)

			break;

		saved = *trv;

		if (saved == '/' || saved == '\\') {

			int rv;

			*trv = '\0';

			rv = stat(path, &sbuf);

			*trv = saved;

			if (rv)

				return(0);

			if (!S_ISDIR(sbuf.st_mode)) {

				errno = ENOTDIR;

				return(0);

			}

			break;

		}

	}

	for (;;) {

		if (doopen) {

			if ((*doopen =

			    open(path, O_CREAT|O_EXCL|O_RDWR|extraFlags, 0600)) >= 0)

				return(1);

			if (errno != EEXIST)

				return(0);

		}

		else if (stat(path, &sbuf))

			return(errno == ENOENT ? 1 : 0);

		/* tricky little algorithm for backward compatibility */

		for (trv = start;;) {

			if (!*trv)

				return(0);

			if (*trv == 'z')

				*trv++ = 'a';

			else {

				if (isdigit(*trv))

					*trv = 'a';

				else

					++*trv;

				break;

			}

		}

	}

	/*NOTREACHED*/

}