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[mirror_edk2.git] / StdLib / LibC / Stdio / gettemp.c

/** @file\r
  Internal function to generate temporary file name for tmpnam.\r
\r
  Copyright (c) 2010, Intel Corporation. All rights reserved.<BR>\r
  This program and the accompanying materials are licensed and made available\r
  under the terms and conditions of the BSD License that accompanies this\r
  distribution.  The full text of the license may be found at\r
  http://opensource.org/licenses/bsd-license.php.\r
\r
  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
\r
  Copyright (c) 1987, 1993\r
   The Regents of the University of California.  All rights reserved.\r
\r
  Redistribution and use in source and binary forms, with or without\r
  modification, are permitted provided that the following conditions\r
  are met:\r
    1. Redistributions of source code must retain the above copyright\r
       notice, this list of conditions and the following disclaimer.\r
    2. Redistributions in binary form must reproduce the above copyright\r
       notice, this list of conditions and the following disclaimer in the\r
       documentation and/or other materials provided with the distribution.\r
    3. Neither the name of the University nor the names of its contributors\r
       may be used to endorse or promote products derived from this software\r
       without specific prior written permission.\r
\r
  THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND\r
  ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE\r
  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE\r
  ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE\r
  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL\r
  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS\r
  OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)\r
  HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT\r
  LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY\r
  OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF\r
  SUCH DAMAGE.\r
\r
  NetBSD: gettemp.c,v 1.13 2003/12/05 00:57:36 uebayasi Exp\r
**/\r
#include  <LibConfig.h>\r
\r
#if HAVE_NBTOOL_CONFIG_H\r
#include "nbtool_config.h"\r
#endif\r
\r
#if !defined(HAVE_NBTOOL_CONFIG_H) || !defined(HAVE_MKSTEMP) || !defined(HAVE_MKDTEMP)\r
\r
#include <sys/EfiCdefs.h>\r
#if defined(LIBC_SCCS) && !defined(lint)\r
#if 0\r
static char sccsid[] = "@(#)mktemp.c  8.1 (Berkeley) 6/4/93";\r
#else\r
__RCSID("$NetBSD: gettemp.c,v 1.13 2003/12/05 00:57:36 uebayasi Exp $");\r
#endif\r
#endif /* LIBC_SCCS and not lint */\r
\r
#include <sys/types.h>\r
#include <sys/stat.h>\r
\r
#include <assert.h>\r
#include <ctype.h>\r
#include <errno.h>\r
#include <fcntl.h>\r
#include <stdio.h>\r
#include <stdlib.h>\r
#include <sys/EfiSysCall.h>\r
\r
#if HAVE_NBTOOL_CONFIG_H\r
#define GETTEMP   gettemp\r
#else\r
#include "reentrant.h"\r
#include "local.h"\r
#define GETTEMP   __gettemp\r
#endif\r
\r
int\r
GETTEMP(\r
  char *path,\r
  int *doopen,\r
  int domkdir\r
  )\r
{\r
  char *start, *trv;\r
  struct stat sbuf;\r
\r
  /* To guarantee multiple calls generate unique names even if\r
     the file is not created. 676 different possibilities with 7\r
     or more X's, 26 with 6 or less. */\r
  static char xtra[] = "aa";\r
  int xcnt = 0;\r
\r
  _DIAGASSERT(path != NULL);\r
  /* doopen may be NULL */\r
\r
  /* Move to end of path and count trailing X's. */\r
  for (trv = path; *trv; ++trv) {\r
    if (*trv == 'X') {\r
      xcnt++;\r
    }\r
    else {\r
      xcnt = 0;\r
    }\r
  }\r
\r
  /* Use at least one from xtra.  Use 2 if more than 6 X's. */\r
  if (*(trv - 1) == 'X')\r
    *--trv = xtra[0];\r
  if (xcnt > 6 && *(trv - 1) == 'X')\r
    *--trv = xtra[1];\r
\r
  /* Set remaining X's to 0's. */\r
  while (*--trv == 'X') {\r
    *trv = '0';\r
  }\r
\r
  /* update xtra for next call. */\r
  if (xtra[0] != 'z')\r
    xtra[0]++;\r
  else {\r
    xtra[0] = 'a';\r
    if (xtra[1] != 'z')\r
      xtra[1]++;\r
    else\r
      xtra[1] = 'a';\r
  }\r
\r
  /*\r
   * check the target directory; if you have six X's and it\r
   * doesn't exist this runs for a *very* long time.\r
   */\r
  for (start = trv + 1;; --trv) {\r
    if (trv <= path)\r
      break;\r
    if (*trv == '/') {\r
      *trv = '\0';\r
      if (stat(path, &sbuf))\r
        return (0);\r
      if (!S_ISDIR(sbuf.st_mode)) {\r
        errno = ENOTDIR;\r
        return (0);\r
      }\r
      *trv = '/';\r
      break;\r
    }\r
  }\r
\r
  for (;;) {\r
    if (doopen) {\r
      if ((*doopen =\r
          open(path, O_CREAT | O_EXCL | O_RDWR, 0600)) >= 0)\r
        return (1);\r
      if (errno != EEXIST)\r
        return (0);\r
    } else if (domkdir) {\r
      if (mkdir(path, 0700) >= 0)\r
        return (1);\r
      if (errno != EEXIST)\r
        return (0);\r
    } else if (lstat(path, &sbuf))\r
      return (errno == ENOENT ? 1 : 0);\r
\r
    /* tricky little algorithm for backward compatibility */\r
    for (trv = start;;) {\r
      if (!*trv)\r
        return (0);\r
      if (*trv == 'z') {\r
        *trv++ = 'a';\r
      }\r
      else {\r
        if (isdigit((unsigned char)*trv))\r
          *trv = 'a';\r
        else\r
          ++*trv;\r
        break;\r
      }\r
    }\r
  }\r
  /*NOTREACHED*/\r
}\r
\r
#endif /* !HAVE_NBTOOL_CONFIG_H || !HAVE_MKSTEMP || !HAVE_MKDTEMP */\r