1 /* 2 * Copyright (c) 1987, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #if defined(LIBC_SCCS) && !defined(lint) 35 static char sccsid[] = "@(#)mktemp.c 8.1 (Berkeley) 6/4/93"; 36 #endif /* LIBC_SCCS and not lint */ 37 38 #include <sys/types.h> 39 #include <sys/stat.h> 40 #include <fcntl.h> 41 #include <errno.h> 42 #include <stdio.h> 43 #include <ctype.h> 44 #include <unistd.h> 45 #include <stdlib.h> 46 47 static int _gettemp(char*,int*,int); 48 49 int 50 mkstemp(path) 51 char *path; 52 { 53 int fd; 54 55 return (_gettemp(path, &fd, 0) ? fd : -1); 56 } 57 58 char * 59 mktemp(path) 60 char *path; 61 { 62 return(_gettemp(path, (int *)NULL, 0) ? path : (char *)NULL); 63 } 64 65 char * 66 mkdtemp(path) 67 char *path; 68 { 69 return(_gettemp(path, (int *)NULL, 1) ? path : (char *)NULL); 70 } 71 72 static int 73 _gettemp(path, doopen, domkdir) 74 char *path; 75 register int *doopen; 76 int domkdir; 77 { 78 extern int errno; 79 register char *start, *trv; 80 struct stat sbuf; 81 u_int pid; 82 static int lastnames = 0; 83 int names = 0; 84 85 pid = getpid(); 86 for (trv = path; *trv; ++trv); /* extra X's get set to 0's */ 87 while (*--trv == 'X') { 88 *trv = (pid % 10) + '0'; 89 pid /= 10; 90 } 91 92 /* 93 * check the target directory; if you have six X's and it 94 * doesn't exist this runs for a *very* long time. 95 */ 96 for (start = trv + 1;; --trv) { 97 if (trv <= path) 98 break; 99 if (*trv == '/') { 100 *trv = '\0'; 101 if (stat(path, &sbuf)) 102 return(0); 103 if (!S_ISDIR(sbuf.st_mode)) { 104 errno = ENOTDIR; 105 return(0); 106 } 107 *trv = '/'; 108 break; 109 } 110 } 111 112 for (;;) { 113 /* tricky little algorithm for backward compatibility */ 114 for (trv = start;;) { 115 if (!*trv) 116 return(0); 117 if (*trv == 'z') 118 *trv++ = 'a'; 119 else { 120 if (isdigit(*trv)) 121 *trv = 'a'; 122 else 123 ++*trv; 124 break; 125 } 126 } 127 128 names++; 129 130 if(names <= lastnames) 131 continue; 132 133 lastnames = names; 134 135 if (doopen) { 136 if ((*doopen = 137 open(path, O_CREAT|O_EXCL|O_RDWR, 0600)) >= 0) { 138 return(1); 139 } 140 if (errno != EEXIST) { 141 return(0); 142 } 143 } else if(domkdir) { 144 if (mkdir(path, 0700) >= 0) 145 return (1); 146 if (errno != EEXIST) 147 return (0); 148 } else if (stat(path, &sbuf)) { 149 return(errno == ENOENT ? 1 : 0); 150 } 151 152 } 153 /*NOTREACHED*/ 154 } 155 156 /* 157 * $PchId: mktemp.c,v 1.3 1995/11/20 19:10:39 philip Exp $ 158 */ 159