/* * 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) static char sccsid[] = "@(#)mktemp.c 8.1 (Berkeley) 6/4/93"; #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> static int _gettemp(); 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 _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*/ }