1 /* 2 * Copyright (c) 1988, 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. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #if defined(LIBC_SCCS) && !defined(lint) 31 static char rcsid[] = "$OpenBSD: tempnam.c,v 1.12 2003/06/02 20:18:37 millert Exp $"; 32 #endif /* LIBC_SCCS and not lint */ 33 34 #include <sys/param.h> 35 #include <errno.h> 36 #include <stdio.h> 37 #include <stdlib.h> 38 #include <string.h> 39 #include <unistd.h> 40 #include <paths.h> 41 42 __warn_references(tempnam, 43 "warning: tempnam() possibly used unsafely; consider using mkstemp()"); 44 45 extern char *_mktemp(char *); 46 47 char * 48 tempnam(dir, pfx) 49 const char *dir, *pfx; 50 { 51 int sverrno; 52 char *f, *name; 53 54 if (!(name = malloc(MAXPATHLEN))) 55 return(NULL); 56 57 if (!pfx) 58 pfx = "tmp."; 59 60 if (issetugid() == 0 && (f = getenv("TMPDIR"))) { 61 (void)snprintf(name, MAXPATHLEN, "%s%s%sXXXXXXXXXX", f, 62 *(f + strlen(f) - 1) == '/'? "": "/", pfx); 63 if ((f = _mktemp(name))) 64 return(f); 65 } 66 67 if ((f = (char *)dir)) { 68 (void)snprintf(name, MAXPATHLEN, "%s%s%sXXXXXXXXXX", f, 69 *(f + strlen(f) - 1) == '/'? "": "/", pfx); 70 if ((f = _mktemp(name))) 71 return(f); 72 } 73 74 f = P_tmpdir; 75 (void)snprintf(name, MAXPATHLEN, "%s%sXXXXXXXXX", f, pfx); 76 if ((f = _mktemp(name))) 77 return(f); 78 79 f = _PATH_TMP; 80 (void)snprintf(name, MAXPATHLEN, "%s%sXXXXXXXXX", f, pfx); 81 if ((f = _mktemp(name))) 82 return(f); 83 84 sverrno = errno; 85 free(name); 86 errno = sverrno; 87 return(NULL); 88 } 89