andre@3: /*
andre@3:  * Copyright (c) 1987, 1993
andre@3:  *	The Regents of the University of California.  All rights reserved.
andre@3:  *
andre@3:  * Redistribution and use in source and binary forms, with or without
andre@3:  * modification, are permitted provided that the following conditions
andre@3:  * are met:
andre@3:  * 1. Redistributions of source code must retain the above copyright
andre@3:  *    notice, this list of conditions and the following disclaimer.
andre@3:  * 2. Redistributions in binary form must reproduce the above copyright
andre@3:  *    notice, this list of conditions and the following disclaimer in the
andre@3:  *    documentation and/or other materials provided with the distribution.
andre@3:  * 3. ***REMOVED*** - see 
andre@3:  *    ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change
andre@3:  * 4. Neither the name of the University nor the names of its contributors
andre@3:  *    may be used to endorse or promote products derived from this software
andre@3:  *    without specific prior written permission.
andre@3:  *
andre@3:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
andre@3:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
andre@3:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
andre@3:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
andre@3:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
andre@3:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
andre@3:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
andre@3:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
andre@3:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
andre@3:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
andre@3:  * SUCH DAMAGE.
andre@3:  */
andre@3: 
andre@3: #if defined(LIBC_SCCS) && !defined(lint)
andre@3: static char sccsid[] = "@(#)mktemp.c	8.1 (Berkeley) 6/4/93";
andre@3: #endif /* LIBC_SCCS and not lint */
andre@3: 
andre@3: #ifdef macintosh
andre@3: #include <unix.h>
andre@3: #else
andre@3: #include <sys/types.h>
andre@3: #include <sys/stat.h>
andre@3: #endif
andre@3: #include <fcntl.h>
andre@3: #include <errno.h>
andre@3: #include <stdio.h>
andre@3: #include <ctype.h>
andre@3: #include "mcom_db.h"
andre@3: 
andre@3: #ifndef _WINDOWS
andre@3: #include <unistd.h>
andre@3: #endif
andre@3: 
andre@3: #ifdef _WINDOWS
andre@3: #include <process.h>
andre@3: #include "winfile.h"
andre@3: #endif
andre@3: 
andre@3: static int _gettemp(char *path, register int *doopen, int extraFlags);
andre@3: 
andre@3: int
andre@3: mkstemp(char *path)
andre@3: {
andre@3: #ifdef XP_OS2
andre@3: 	FILE *temp = tmpfile();
andre@3: 
andre@3: 	return (temp ? fileno(temp) : -1);
andre@3: #else
andre@3: 	int fd;
andre@3: 
andre@3: 	return (_gettemp(path, &fd, 0) ? fd : -1);
andre@3: #endif
andre@3: }
andre@3: 
andre@3: int
andre@3: mkstempflags(char *path, int extraFlags)
andre@3: {
andre@3: 	int fd;
andre@3: 
andre@3: 	return (_gettemp(path, &fd, extraFlags) ? fd : -1);
andre@3: }
andre@3: 
andre@3: /* NB: This routine modifies its input string, and does not always restore it.
andre@3: ** returns 1 on success, 0 on failure.
andre@3: */
andre@3: static int 
andre@3: _gettemp(char *path, register int *doopen, int extraFlags)
andre@3: {    
andre@3: 	register char *start, *trv;
andre@3: 	struct stat sbuf;
andre@3: 	unsigned int pid;
andre@3: 
andre@3: 	pid = getpid();
andre@3: 	for (trv = path; *trv; ++trv);		/* extra X's get set to 0's */
andre@3: 	while (*--trv == 'X') {
andre@3: 		*trv = (pid % 10) + '0';
andre@3: 		pid /= 10;
andre@3: 	}
andre@3: 
andre@3: 	/*
andre@3: 	 * check the target directory; if you have six X's and it
andre@3: 	 * doesn't exist this runs for a *very* long time.
andre@3: 	 */
andre@3: 	for (start = trv + 1;; --trv) {
andre@3: 		char saved;
andre@3: 		if (trv <= path)
andre@3: 			break;
andre@3: 		saved = *trv;
andre@3: 		if (saved == '/' || saved == '\\') {
andre@3: 			int rv;
andre@3: 			*trv = '\0';
andre@3: 			rv = stat(path, &sbuf);
andre@3: 			*trv = saved;
andre@3: 			if (rv)
andre@3: 				return(0);
andre@3: 			if (!S_ISDIR(sbuf.st_mode)) {
andre@3: 				errno = ENOTDIR;
andre@3: 				return(0);
andre@3: 			}
andre@3: 			break;
andre@3: 		}
andre@3: 	}
andre@3: 
andre@3: 	for (;;) {
andre@3: 		if (doopen) {
andre@3: 			if ((*doopen =
andre@3: 			    open(path, O_CREAT|O_EXCL|O_RDWR|extraFlags, 0600)) >= 0)
andre@3: 				return(1);
andre@3: 			if (errno != EEXIST)
andre@3: 				return(0);
andre@3: 		}
andre@3: 		else if (stat(path, &sbuf))
andre@3: 			return(errno == ENOENT ? 1 : 0);
andre@3: 
andre@3: 		/* tricky little algorithm for backward compatibility */
andre@3: 		for (trv = start;;) {
andre@3: 			if (!*trv)
andre@3: 				return(0);
andre@3: 			if (*trv == 'z')
andre@3: 				*trv++ = 'a';
andre@3: 			else {
andre@3: 				if (isdigit(*trv))
andre@3: 					*trv = 'a';
andre@3: 				else
andre@3: 					++*trv;
andre@3: 				break;
andre@3: 			}
andre@3: 		}
andre@3: 	}
andre@3: 	/*NOTREACHED*/
andre@3: }