132 lines
3.5 KiB
C
132 lines
3.5 KiB
C
/*
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* Copyright (c) 1987, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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static char sccsid[] = "@(#)mktemp.c 8.1 (Berkeley) 6/4/93";
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#endif
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static const char rcsid[] =
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"$Id: mktemp.c,v 1.6 1997/02/22 15:02:16 peter Exp $";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <stdio.h>
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#include <ctype.h>
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#include <unistd.h>
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static int _gettemp(char *, int *);
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int
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mkstemp(path)
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char *path;
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{
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int fd;
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return (_gettemp(path, &fd) ? fd : -1);
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}
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char *
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mktemp(path)
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char *path;
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{
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return(_gettemp(path, (int *)NULL) ? path : (char *)NULL);
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}
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static int
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_gettemp(path, doopen)
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char *path;
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register int *doopen;
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{
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register char *start, *trv;
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struct stat sbuf;
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pid_t pid;
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pid = getpid();
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for (trv = path; *trv; ++trv); /* extra X's get set to 0's */
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while (*--trv == 'X') {
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*trv = (pid % 10) + '0';
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pid /= 10;
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}
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/*
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* check the target directory; if you have six X's and it
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* doesn't exist this runs for a *very* long time.
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*/
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for (start = trv + 1;; --trv) {
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if (trv <= path)
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break;
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if (*trv == '/') {
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*trv = '\0';
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if (stat(path, &sbuf))
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return(0);
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if (!S_ISDIR(sbuf.st_mode)) {
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errno = ENOTDIR;
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return(0);
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}
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*trv = '/';
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break;
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}
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}
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for (;;) {
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if (doopen) {
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if ((*doopen =
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open(path, O_CREAT|O_EXCL|O_RDWR, 0600)) >= 0)
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return(1);
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if (errno != EEXIST)
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return(0);
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}
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else if (lstat(path, &sbuf))
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return(errno == ENOENT ? 1 : 0);
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/* tricky little algorithm for backward compatibility */
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for (trv = start;;) {
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if (!*trv)
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return(0);
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if (*trv == 'z')
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*trv++ = 'a';
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else {
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if (isdigit(*trv))
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*trv = 'a';
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else
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++*trv;
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break;
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}
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}
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}
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/*NOTREACHED*/
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}
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