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