134 lines
3.5 KiB
C
134 lines
3.5 KiB
C
/* $NetBSD: mktemp.c,v 1.5 1995/02/02 02:10:09 jtc Exp $ */
|
|
|
|
/*
|
|
* 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. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 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)
|
|
#if 0
|
|
static char sccsid[] = "@(#)mktemp.c 8.1 (Berkeley) 6/4/93";
|
|
#endif
|
|
static char rcsid[] = "$NetBSD: mktemp.c,v 1.5 1995/02/02 02:10:09 jtc Exp $";
|
|
#endif /* LIBC_SCCS and not lint */
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <fcntl.h>
|
|
#include <errno.h>
|
|
#include <stdio.h>
|
|
#include <ctype.h>
|
|
#include <unistd.h>
|
|
|
|
static int _gettemp();
|
|
|
|
int
|
|
mkstemp(path)
|
|
char *path;
|
|
{
|
|
int fd;
|
|
|
|
return (_gettemp(path, &fd) ? fd : -1);
|
|
}
|
|
|
|
char *
|
|
mktemp(path)
|
|
char *path;
|
|
{
|
|
return(_gettemp(path, (int *)NULL) ? path : (char *)NULL);
|
|
}
|
|
|
|
static int
|
|
_gettemp(path, doopen)
|
|
char *path;
|
|
register int *doopen;
|
|
{
|
|
extern int errno;
|
|
register char *start, *trv;
|
|
struct stat sbuf;
|
|
u_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) {
|
|
if (trv <= path)
|
|
break;
|
|
if (*trv == '/') {
|
|
*trv = '\0';
|
|
if (stat(path, &sbuf))
|
|
return(0);
|
|
if (!S_ISDIR(sbuf.st_mode)) {
|
|
errno = ENOTDIR;
|
|
return(0);
|
|
}
|
|
*trv = '/';
|
|
break;
|
|
}
|
|
}
|
|
|
|
for (;;) {
|
|
if (doopen) {
|
|
if ((*doopen =
|
|
open(path, O_CREAT|O_EXCL|O_RDWR, 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*/
|
|
}
|