1/* $NetBSD: tempnam.c,v 1.21 2009/10/25 20:44:13 christos Exp $ */ 2 3/* 4 * Copyright (c) 1988, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32#include <sys/cdefs.h> 33#if defined(LIBC_SCCS) && !defined(lint) 34#if 0 35static char sccsid[] = "@(#)tempnam.c 8.1 (Berkeley) 6/4/93"; 36#else 37__RCSID("$NetBSD: tempnam.c,v 1.21 2009/10/25 20:44:13 christos Exp $"); 38#endif 39#endif /* LIBC_SCCS and not lint */ 40 41#include "namespace.h" 42#include <sys/param.h> 43#include <errno.h> 44#include <stdio.h> 45#include <stdlib.h> 46#include <string.h> 47#include <unistd.h> 48#include <paths.h> 49#include "reentrant.h" 50#include "local.h" 51 52__warn_references(tempnam, 53 "warning: tempnam() possibly used unsafely, use mkstemp() or mkdtemp()") 54 55static const char * 56trailsl(const char *f) 57{ 58 const char *s = f; 59 while (*s) 60 s++; 61 return (f != s && s[-1] == '/') ? "" : "/"; 62} 63 64static char * 65gentemp(char *name, size_t len, const char *tmp, const char *pfx) 66{ 67 (void)snprintf(name, len, "%s%s%sXXXXXXXXXX", tmp, trailsl(tmp), pfx); 68 return _mktemp(name); 69} 70 71char * 72tempnam(const char *dir, const char *pfx) 73{ 74 int sverrno; 75 char *name, *f; 76 const char *tmp; 77 78 if (!(name = malloc((size_t)MAXPATHLEN))) 79 return NULL; 80 81 if (!pfx) 82 pfx = "tmp."; 83 84 if ((tmp = getenv("TMPDIR")) != NULL && 85 (f = gentemp(name, (size_t)MAXPATHLEN, tmp, pfx)) != NULL) 86 return f; 87 88 if (dir != NULL && 89 (f = gentemp(name, (size_t)MAXPATHLEN, dir, pfx)) != NULL) 90 return f; 91 92 if ((f = gentemp(name, (size_t)MAXPATHLEN, P_tmpdir, pfx)) != NULL) 93 return f; 94 95 if ((f = gentemp(name, (size_t)MAXPATHLEN, _PATH_TMP, pfx)) != NULL) 96 return f; 97 98 sverrno = errno; 99 free(name); 100 errno = sverrno; 101 return NULL; 102} 103