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 * 4. 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) 31static char sccsid[] = "@(#)tempnam.c 8.1 (Berkeley) 6/4/93"; 32#endif /* LIBC_SCCS and not lint */ 33#include <sys/cdefs.h> 34__FBSDID("$FreeBSD: src/lib/libc/stdio/tempnam.c,v 1.11 2007/01/09 00:28:07 imp Exp $"); 35 36#include <sys/param.h> 37#include <errno.h> 38#include <stdio.h> 39#include <stdlib.h> 40#include <string.h> 41#include <unistd.h> 42#include <paths.h> 43 44__warn_references(tempnam, 45 "warning: tempnam() possibly used unsafely; consider using mkstemp()"); 46 47extern char *_mktemp(char *); 48 49char * 50tempnam(dir, pfx) 51 const char *dir, *pfx; 52{ 53 int sverrno; 54 char *f, *name; 55 56 if (!(name = malloc(MAXPATHLEN))) { 57 return(NULL); 58 } 59 60 if (!pfx) 61 pfx = "tmp."; 62 63#if !__DARWIN_UNIX03 64 if (issetugid() == 0 && (f = getenv("TMPDIR"))) { 65 (void)snprintf(name, MAXPATHLEN, "%s%s%sXXXXXX", f, 66 *(f + strlen(f) - 1) == '/'? "": "/", pfx); 67 if ((f = _mktemp(name))) { 68 return(f); 69 } 70 } 71#endif /* !__DARWIN_UNIX03 */ 72 if ((f = (char *)dir)) { 73#if __DARWIN_UNIX03 74 if (access(dir, W_OK) == 0) { 75#endif /* __DARWIN_UNIX03 */ 76 (void)snprintf(name, MAXPATHLEN, "%s%s%sXXXXXX", f, 77 *(f + strlen(f) - 1) == '/'? "": "/", pfx); 78 if ((f = _mktemp(name))) { 79 return(f); 80 } 81#if __DARWIN_UNIX03 82 } 83#endif /* __DARWIN_UNIX03 */ 84 } 85 86 f = P_tmpdir; 87#if __DARWIN_UNIX03 88 if (access(f, W_OK) == 0) { /* directory accessible? */ 89#endif /* __DARWIN_UNIX03 */ 90 (void)snprintf(name, MAXPATHLEN, "%s%sXXXXXX", f, pfx); 91 if ((f = _mktemp(name))) { 92 return(f); 93 } 94 95#if __DARWIN_UNIX03 96 } 97 if (issetugid() == 0 && (f = getenv("TMPDIR")) && access(f, W_OK) == 0) { 98 (void)snprintf(name, MAXPATHLEN, "%s%s%sXXXXXX", f, 99 *(f + strlen(f) - 1) == '/'? "": "/", pfx); 100 if ((f = _mktemp(name))) { 101 return(f); 102 } 103 } 104#endif /* __DARWIN_UNIX03 */ 105 f = _PATH_TMP; 106 (void)snprintf(name, MAXPATHLEN, "%s%sXXXXXX", f, pfx); 107 if ((f = _mktemp(name))) { 108 return(f); 109 } 110 111 sverrno = errno; 112 free(name); 113 errno = sverrno; 114 return(NULL); 115} 116