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 #include <sys/types.h> 35 #include <sys/stat.h> 36 #include <fcntl.h> 37 #include <errno.h> 38 #include <stdio.h> 39 #include <stdlib.h> 40 #include <string.h> 41 #include <ctype.h> 42 #include <unistd.h> 43 #include <stdint.h> 44 45 46 static int _gettemp(char *, int *, int, int); 47 48 static const unsigned char padchar[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"; 49 50 51 #if 0 52 int 53 mkstemps(char *path, int slen) 54 { 55 int fd; 56 return _gettemp(path, &fd, 0, slen) ? fd : -1; 57 } 58 #endif 59 60 61 int 62 mkstemp(char *path) 63 { 64 int fd; 65 if (_gettemp(path, &fd, 0, 0)) 66 return fd; 67 68 return -1; 69 } 70 71 72 char * 73 mkdtemp(path) 74 char *path; 75 { 76 return (_gettemp(path, (int *)NULL, 1, 0) ? path : (char *)NULL); 77 } 78 79 80 char * 81 mktemp(char *path) 82 { 83 if (_gettemp(path, (int *)NULL, 0, 0)) 84 return path; 85 86 return NULL; 87 } 88 89 90 static int 91 _gettemp(char *path, int *doopen, int domkdir, int slen) 92 { 93 char *start, *trv, *suffp; 94 char *pad; 95 struct stat sbuf; 96 int rval; 97 98 if (doopen != NULL && domkdir) { 99 errno = EINVAL; 100 return 0; 101 } 102 103 for (trv = path; *trv != '\0'; ++trv) 104 ; 105 106 trv -= slen; 107 suffp = trv; 108 --trv; 109 if (trv < path) { 110 errno = EINVAL; 111 return 0; 112 } 113 114 /* Fill space with random characters */ 115 while (trv >= path && *trv == 'X') { 116 uint32_t value = rand() % (sizeof(padchar) - 1); 117 *trv-- = padchar[value]; 118 } 119 start = trv + 1; 120 121 /* 122 * check the target directory. 123 */ 124 if (doopen != NULL || domkdir) { 125 for (; trv > path; --trv) { 126 if (*trv == '/') { 127 *trv = '\0'; 128 rval = stat(path, &sbuf); 129 *trv = '/'; 130 if (rval != 0) 131 return 0; 132 if (!S_ISDIR(sbuf.st_mode)) { 133 errno = ENOTDIR; 134 return 0; 135 } 136 break; 137 } 138 } 139 } 140 141 for (;;) { 142 if (doopen) { 143 if ((*doopen = open(path, O_CREAT|O_EXCL|O_RDWR, 0600)) >= 0) 144 return 1; 145 if (errno != EEXIST) 146 return 0; 147 } else if (domkdir) { 148 if (mkdir(path, 0700) == 0) 149 return 1; 150 if (errno != EEXIST) 151 return 0; 152 } else if (lstat(path, &sbuf)) 153 return errno == ENOENT; 154 155 /* If we have a collision, cycle through the space of filenames */ 156 for (trv = start;;) { 157 if (*trv == '\0' || trv == suffp) 158 return 0; 159 pad = strchr(padchar, *trv); 160 if (pad == NULL || *++pad == '\0') 161 *trv++ = padchar[0]; 162 else { 163 *trv++ = *pad; 164 break; 165 } 166 } 167 } 168 169 /* not reached */ 170 } 171