StdLib/LibC/Stdio/tempnam.c

   1 /** @file
   2
   3   Copyright (c) 2011, Intel Corporation. All rights reserved.<BR>
   4   This program and the accompanying materials are licensed and made available under
   5   the terms and conditions of the BSD License that accompanies this distribution.
   6   The full text of the license may be found at
   7   http://opensource.org/licenses/bsd-license.
   8
   9   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  10   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  11
  12  * Copyright (c) 1988, 1993
  13  *  The Regents of the University of California.  All rights reserved.
  14  *
  15  * Redistribution and use in source and binary forms, with or without
  16  * modification, are permitted provided that the following conditions
  17  * are met:
  18  * 1. Redistributions of source code must retain the above copyright
  19  *    notice, this list of conditions and the following disclaimer.
  20  * 2. Redistributions in binary form must reproduce the above copyright
  21  *    notice, this list of conditions and the following disclaimer in the
  22  *    documentation and/or other materials provided with the distribution.
  23  * 3. Neither the name of the University nor the names of its contributors
  24  *    may be used to endorse or promote products derived from this software
  25  *    without specific prior written permission.
  26  *
  27  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  28  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  29  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  30  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  31  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  32  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  33  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  34  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  35  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  36  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  37  * SUCH DAMAGE.
  38
  39     tempnam.c 8.1 (Berkeley) 6/4/93
  40     NetBSD: tempnam.c,v 1.19 2005/07/27 13:23:07 drochner Exp
  41 **/
  42 #include  <LibConfig.h>
  43 #include  <sys/EfiCdefs.h>
  44
  45 #include  "namespace.h"
  46 #include  <sys/param.h>
  47 #include  <errno.h>
  48 #include  <stdio.h>
  49 #include  <stdlib.h>
  50 #include  <string.h>
  51 #include  <unistd.h>
  52 #include  <paths.h>
  53 #include  "reentrant.h"
  54 #include  "local.h"
  55
  56 __warn_references(tempnam,
  57     "warning: tempnam() possibly used unsafely, use mkstemp() or mkdtemp()")
  58
  59 static const char *
  60 trailsl(const char *f)
  61 {
  62   const char *s = f;
  63   while (*s)
  64     s++;
  65   return (f != s && s[-1] == '/') ? "" : "/";
  66 }
  67
  68 static char *
  69 gentemp(char *name, size_t len, const char *tmp, const char  *pfx)
  70 {
  71   (void)snprintf(name, len, "%s%s%sXXXX", tmp, trailsl(tmp), pfx);
  72   return _mktemp(name);
  73 }
  74
  75 char *
  76 tempnam(const char *dir, const char *pfx)
  77 {
  78   int sverrno;
  79   char *name, *f;
  80   const char *tmp;
  81
  82   if ((name = malloc((size_t)MAXPATHLEN)) == NULL)
  83     return NULL;
  84
  85   if (!pfx)
  86     pfx = "tmp.";
  87
  88   if ((tmp = getenv("TMPDIR")) != NULL &&
  89       (f = gentemp(name, (size_t)MAXPATHLEN, tmp, pfx)) != NULL)
  90     return f;
  91
  92   if (dir != NULL &&
  93       (f = gentemp(name, (size_t)MAXPATHLEN, dir, pfx)) != NULL)
  94     return f;
  95
  96   //if ((f = gentemp(name, (size_t)MAXPATHLEN, P_tmpdir, pfx)) != NULL)
  97   //  return f;
  98
  99   if ((f = gentemp(name, (size_t)MAXPATHLEN, _PATH_TMP, pfx)) != NULL)
 100     return f;
 101
 102   sverrno = errno;
 103   free(name);
 104   errno = sverrno;
 105   return(NULL);
 106 }