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 /* 35 * Portions Copyright (c) 1993 by Digital Equipment Corporation. 36 * 37 * Permission to use, copy, modify, and distribute this software for any 38 * purpose with or without fee is hereby granted, provided that the above 39 * copyright notice and this permission notice appear in all copies, and that 40 * the name of Digital Equipment Corporation not be used in advertising or 41 * publicity pertaining to distribution of the document or software without 42 * specific, written prior permission. 43 * 44 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL 45 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES 46 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT 47 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 48 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 49 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 50 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 51 * SOFTWARE. 52 */ 53 54 #include "port_before.h" 55 56 #include <sys/types.h> 57 #include <sys/stat.h> 58 59 #include <ctype.h> 60 #include <errno.h> 61 #include <fcntl.h> 62 #include <stdio.h> 63 64 #include "port_after.h" 65 66 #if (!defined(NEED_MKTEMP)) && (!defined(NEED_MKSTEMP)) 67 int __mktemp_unneeded__; 68 #else 69 70 static int gettemp(char *path, int *doopen); 71 72 #ifdef NEED_MKSTEMP 73 mkstemp(char *path) { 74 int fd; 75 76 return (gettemp(path, &fd) ? fd : -1); 77 } 78 #endif 79 80 #ifdef NEED_MKTEMP 81 char * 82 mktemp(char *path) { 83 return(gettemp(path, (int *)NULL) ? path : (char *)NULL); 84 } 85 #endif 86 87 static int 88 gettemp(char *path, int *doopen) { 89 char *start, *trv; 90 struct stat sbuf; 91 u_int pid; 92 93 pid = getpid(); 94 for (trv = path; *trv; ++trv); /*%< extra X's get set to 0's */ 95 while (*--trv == 'X') { 96 *trv = (pid % 10) + '0'; 97 pid /= 10; 98 } 99 100 /* 101 * check the target directory; if you have six X's and it 102 * doesn't exist this runs for a *very* long time. 103 */ 104 for (start = trv + 1;; --trv) { 105 if (trv <= path) 106 break; 107 if (*trv == '/') { 108 *trv = '\0'; 109 if (stat(path, &sbuf)) 110 return(0); 111 if (!S_ISDIR(sbuf.st_mode)) { 112 errno = ENOTDIR; 113 return(0); 114 } 115 *trv = '/'; 116 break; 117 } 118 } 119 120 for (;;) { 121 if (doopen) { 122 if ((*doopen = 123 open(path, O_CREAT|O_EXCL|O_RDWR, 0600)) >= 0) 124 return(1); 125 if (errno != EEXIST) 126 return(0); 127 } 128 else if (stat(path, &sbuf)) 129 return(errno == ENOENT ? 1 : 0); 130 131 /* tricky little algorithm for backward compatibility */ 132 for (trv = start;;) { 133 if (!*trv) 134 return(0); 135 if (*trv == 'z') 136 *trv++ = 'a'; 137 else { 138 if (isdigit(*trv)) 139 *trv = 'a'; 140 else 141 ++*trv; 142 break; 143 } 144 } 145 } 146 /*NOTREACHED*/ 147 } 148 149 #endif /*NEED_MKTEMP*/ 150 151 /*! \file */ 152